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  Subjects -> CHEMISTRY (Total: 841 journals)
    - ANALYTICAL CHEMISTRY (50 journals)
    - CHEMISTRY (593 journals)
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CHEMISTRY (593 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 34)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 18)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 23)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 234)
ACS Photonics     Full-text available via subscription   (Followers: 11)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 21)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 55)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 14)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 19)
Advances in Nanoparticles     Open Access   (Followers: 15)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 19)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 2)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 69)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 26)
American Journal of Plant Physiology     Open Access   (Followers: 14)
American Mineralogist     Hybrid Journal   (Followers: 14)
Analyst     Full-text available via subscription   (Followers: 40)
Angewandte Chemie     Hybrid Journal   (Followers: 204)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 214)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 2)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 8)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 15)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Surface Science     Hybrid Journal   (Followers: 28)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 4)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 293)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 9)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 1)
Biomacromolecules     Full-text available via subscription   (Followers: 19)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 4)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 124)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 98)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 3)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 3)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 66)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 8)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 13)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 71)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 23)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 176)
Chemical Science     Open Access   (Followers: 22)
Chemical Technology     Open Access   (Followers: 16)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 8)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 57)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 26)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 6)
Chemistry & Biology     Full-text available via subscription   (Followers: 30)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 143)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 45)
Chemistry of Materials     Full-text available via subscription   (Followers: 260)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 7)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 2)
Copernican Letters     Open Access   (Followers: 1)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
CrystEngComm     Full-text available via subscription   (Followers: 12)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 58)
Dalton Transactions     Full-text available via subscription   (Followers: 22)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  
Drying Technology: An International Journal     Hybrid Journal   (Followers: 4)
Eclética Química     Open Access   (Followers: 1)
Ecological Chemistry and Engineering S     Open Access   (Followers: 4)
Ecotoxicology and Environmental Contamination     Open Access  
Educación Química     Open Access   (Followers: 1)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
EJNMMI Radiopharmacy and Chemistry     Open Access  
Elements     Full-text available via subscription   (Followers: 2)
Environmental Chemistry     Hybrid Journal   (Followers: 9)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)
Environmental Science : Nano     Partially Free   (Followers: 1)
Environmental Toxicology & Chemistry     Hybrid Journal   (Followers: 18)

        1 2 3 | Last

Journal Cover Bulletin of the Chemical Society of Ethiopia
  [SJR: 0.239]   [H-I: 14]   [2 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 1011-3924
   Published by African Journals Online Homepage  [266 journals]
  • Theoretical study (ab initio and DFT methods) on acidic dissociation
           constant of xylenol orange in aqueous solution

    • Authors: F. Kiani, F. Ghadernezhad, F. Koohyar, S. A. Shahidi
      Abstract: Analytical measurement of materials requires exact knowledge of their acid dissociation constant (pKa) values. In recent years, quantum mechanical calculations have been extensively used to study of acidities in the aqueous solutions and the results were compared with the experimental values. In this study, a theoretical study was carried out on xylenol orange (in water solution) by ab initio method. We calculated the pKa values of xylenol orange in water, using high-level ab initio (PM3), DFT (HF, B3LYP/6-31+G(d)) and SCRF methods. The experimental determination of these values (pKa,s) is a challenge because xylenol orange has a low solubility in water. We considered several ionization reactions and equilibriums in water that constitute the indispensable theoretical basis to calculate the pKa values of xylenol orange. The results show that the calculated pKa values have a comparable agreement with the experimentally determined pKa values. Therefore, this method can be used to predict such properties for indicators, drugs and other important molecules.               KEY WORDS: Ab initio, DFT method, Ionization constant, Xylenol orange, Atomic charge Bull. Chem. Soc. Ethiop. 2017, 31(1), 127-136.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.11
      PubDate: 2017-07-23
      Issue No: Vol. 31, No. 1 (2017)
       
  • The QuEChERS analytical method combined with low density solvent based
           dispersive liquid–liquid microextraction for quantitative extraction of
           multiclass pesticide residues in cereals

    • Authors: T. Bedassa, A. Gure, N. Megersa
      Abstract: In this study, a combination QuEChERS and low density solvent based DLLME was developed for extraction and preconcentration of five multiclass pesticide residues including atrazine, ametryn, terbutryn, carbaryl and chlorothalonil, from selected cereals: Teff, barley and maize samples. Liquid chromatography with variable wavelength detector (VWD) was used for quantitative determination of the pesticides. Various experimental parameters affecting the extraction and the preconcentration efficiencies were optimized. Calibration curves constructed using Teff samples were linear over wide ranges, 7.1-200 μg kg-1 with R2 ≥ 0.990. LODs of the method were ≤ 8.9 μg kg-1, below the MRLs of EU for maize and barley. The RSDs were in the range of 2.3–9.5%. The method has also been applied to different cereal samples and satisfactory average recoveries ranging 69.0–117% were obtained for the spiked cereal samples at two concentration levels. Therefore, the developed method can be successfully utilized as a simple alternative for the analysis of multiclass pesticide residues in cereals and other related samples. KEY WORDS: QuEChERS method, Low density solvent based DLLME, Multiclass pesticide residues, Cereal samples, HPLC-VWD, Quantitative extraction Bull. Chem. Soc. Ethiop. 2017, 31(1), 1-15.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.1            
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • Assessment of essential and non-essential metals in Ethiopian traditional
           fermented alcoholic beverages

    • Authors: A. Debebe, B. S. Chandravanshi, M. R. Abshiro
      Abstract: Evaluation of the levels of essential and non-essential metal concentrations in Ethiopian traditional fermented alcoholic beverages (Tella, Tej, Birz, Korefe, Keribo and Borde) was conducted using atomic absorption spectrophotometer (AAS) after HNO3/H2O2 digestion process. A total of 10 bulk samples were collected randomly from vending houses at five different sub-cities of Addis Ababa, the capital city of Ethiopia (Lideta-Kolfe, Bole-Kirkose, Yeka-Gullele, Arada-Addis Ketema and Akaki-Kaliti-Lafto) and from five nearby towns (Sebeta, Dukem, Sululta, Sendafa, and Burayu) of Oromia Regional State. The considered metals include: Ca, Mg, Fe, Zn, Cd, Cr, Cu, Ni, Pb, Co and Mn to ascertain their levels. With 88–96% recovery Ca, Mg, Fe, Zn, Cu, Cd, Pb and Mn were detected at varying concentrations in the beverages, while Co, Ni and Cr were below detection limits. All the beverages were rich in Ca, Mg and Zn. Among the trace metals found Zn was the first. The levels of the trace metals were generally low, and within statutory safe limits set by World Health Organization (WHO). Mineral concentrations were found to be significantly different among the beverages studied (p < 0.05). The levels of metals in the Ethiopian fermented beverages were found comparable with the reported ones. KEY WORDS: Ethiopian beverages, Traditional beverages, Fermented beverages, Essential elements, Non-essential elements Bull. Chem. Soc. Ethiop. 2017, 31(1), 17-30.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.2
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • A simple and facile colorimetric chemosensor for selective detection of
           Cu2+ ion in aqueous solution

    • Authors: G. T. Tigineh, L. K.Liu
      Abstract: In this paper the chemical sensing ability of aromatic salicylideneaniline Schiff-base (ASASB), synthesized solvent-free mechanochemically and characterized, was assessed via UV-Vis spectroscopic method together with naked-eye detection. Metal ions in aqueous medium from s, p and d-block elements were investigated based on chelation-induced colorimetric chemosensing. The result revealed that ASASB can be used as a new colorimetric chemosensor for selective detection of Cu2+ ion in aqueous solution.               KEY WORDS: Metal ion, Schiff-base, Colorimetric chemosensor, Mechanochemistry Bull. Chem. Soc. Ethiop. 2017, 31(1), 31-38.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.3
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • Direct acetylation of sunflower oil in the presence of boron trioxide
           catalyst and the adduct usage as the base stock and lubricant additive

    • Authors: J. Ashrafi, A. Semnani, H. S. Langeroodi, M. Shirani
      Abstract: Lubrication properties of sunflower oil have been modified by epoxidation in the first step and acetylation of the obtained epoxide in the second step. Epoxidation has been followed in dichloromethane solution in the presence of hydrogen peroxide and acetic acid as oxidizing agent and sulfuric acid as catalyst. The reaction has been monitored and optimized by measurement of iodine value, epoxy content, and recording the FTIR spectrum at different experimental conditions. Acetylation has been performed by enduring the optimized conditions of epoxidation reaction, in the presence of boron trioxide as catalyst and at elevated temperature. The recent reaction has been monitored and optimized by measurement of hydroxyl value, epoxy content, and recording the FTIR spectrum at different experimental conditions. The final product of both,epoxidation and acetylation reactions has been confirmed by FTIR and NMR data. Relative to sunflower oil, pour point and oxidation stability of the modified oil has considerably been improved. The modified oil has successfully been employed in the formulation of industrial gear oil. The investigation on the possibility of the additive application of the modified oil, as well as its miscibility with additives was considered.     KEY WORDS: Sunflower oil, Lubrication, Epoxidation, Acetylation, Borontrioxide, Gear oil blending, Polyalphaolephin-100, Polyisobutene Bull. Chem. Soc. Ethiop. 2017, 31(1), 39-49.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.4 
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • Adsorption of acid dye onto activated Algerian clay

    • Authors: D. Bendaho, T. A. Driss, D. Bassou
      Abstract: In this work, activated clay from Algeria was used as adsorbent for the removal of methyl orange (MO) from aqueous solution, for this, the effects of several parameters such as contact time, adsorbent dose, pH value of aqueous solution and temperature on the adsorption of MO were also studied. The results showed that nearly 30 min of contact time are found to be sufficient for the adsorption to reach equilibrium and the adsorption was favourable at lower pH. The acid dye concentration is measured with UV-visible spectrophotometer at a wavelength of 464 nm. The adsorption capacity of MO found to be 32.57 mg/g. The Pseudo-first-order and pseudo-second-order models were used to fit the experimental data. The adsorption kinetic process was found to follow a pseudo second order model.The Langmuir and Freundlich isotherms models were used to describe adsorption data, the results indicates that Langmuir and Freundlich models provide better correlation of the experimental data. The negative values of ΔG° at different temperatures show that the adsorption process is spontaneous. The values of ΔH and ΔS were found to be 1.04 kJ/mol and 3.35 J/mol.K, respectively. The positive value of ΔH confirms that the adsorption is endothermic and the adsorption process is chemical nature.               KEY WORDS: Dye, Adsorption, Cay, Adsorption kinetics, Adsorption isotherms Bull. Chem. Soc. Ethiop. 2017, 31(1), 51-62.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.5
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • FT-IR, NMR spectroscopic and quantum mechanical investigations of two
           ferrocene derivatives

    • Authors: Ö. Alver, C. Parlak
      Abstract: New ferrocene derivatives as N-(3-piperidin-1-ylpropyl)ferrocenamide (Fc-3ppa) and N-(pyridine-3-ylmethyl)ferrocenamide (Fc-3pica) and structural investigations were carried out with 1H, 13C, DEPT 45 or 135, HETCOR, COSY NMR and FT-IR spectroscopic techniques. Characterization of Fc-3ppa (FeC19H26N2O) and Fc-3pica (FeC17H16N2O) was also supported by density functional theory (DFT) used by B3LYP functional and 6-31G(d) or 6-311++G(d,p) basis sets. From the combination of all the results, it can be clearly seen that syntheses of Fc-3ppa and Fc-3pica have been successfully achieved. Theoretical values are successfully compared against experimental data and B3LYP method is able to provide satisfactory results for predicting NMR properties and vibrational frequencies of the synthesized ferrocene based systems.               KEY WORDS: Ferrocene derivatives, FT-IR, NMR, DFT, B3LYP Bull. Chem. Soc. Ethiop. 2017, 31(1), 63-74.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.6
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • Synthesis, characterization and bioactivity ¬¬¬¬Zn2+, Cu2+, Ni2+,
           Co2+, Mn2+, Fe3+, Ru3+, VO2+ and UO22+ complexes of
           2-hydroxy-5-((4-nitrophenyl)diazenyl)benzylidene)-2-(p-tolyl-
           amino)acetohydrazide

    • Authors: M. M. E. Shakdofa, A. N. Al-Hakimi, F. A. Elsaied, S. O. M. Alasbahi, A. M. A. Alkwlini
      Abstract: Novel azo-acetohydrazide complexes of Zn2+, Cu2+, Ni2+, Co2+, Mn2+, Fe3+, Ru3+, VO2+ and UO22+ with 2-hydroxy-5-((4-nitrophenyl)diazenyl)benzylidene)-2-(p-tolylamino)acetohydrazide have been prepared. All the compounds were analytically and spectroscopically characterized by various techniques. The data of molar conductance indicated the prepared complexes are nonelectrolyte in nature except complexes (10) and (11). The spectroscopic data point out that the behavior of ligand towards metal ions are neutral or monobasic bidentate, and dibasic tridentate ligand linked to the metal ions through oxygen atom of ketonic or enolic carbonyl group, azomethine nitrogen atom and/or deprotonated phenolic group forming either octahedral or tetragonally distorted octahedral geometry. X-ray powder diffraction analysis of complexes (2) and (3) indicate that the complexes are crystalline in nature and have monoclinic structures. The microbicides activities of all compounds evaluated by well diffusion method versus Escherichia coli and Aspergillus niger at different concentration. The bioactivities data elucidated that as the concentration of the tested solutions increases the activities increase.               KEY WORDS: Azo-acetohydrazide, Azo-hydrazone, Metal complexes, Bioactivity, X-ray diffraction analysis Bull. Chem. Soc. Ethiop. 2017, 31(1), 75-91.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.7    
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • Exceedingly facile one-pot protocols to the synthesis of pyrimido
           annulated analogues of carbazolo condensed azepinones and their evaluation
           for analgesic activity

    • Authors: M. Agrawal, S. Jain, S. Sharma, J. Dwivedi, D. Kishore
      Abstract: Extremely simple protocols based on the reactivity of corresponding oxoketenedithioacetal (4), 2-(dimethylaminomethylene) ketone (5), β-oxoenolether (6) and α,β-unsaturated ketone (7) derivatives of 7-ethyl-3, 4-dihydroazepino[3,2-b]carbazol-2,5(1H,7H)-dione (3) have been developed to provide an easy access to their pyrimido annulated analogues (8-15) of medicinal interest. The key compound 3 from which, the synthesis proceeded has been realized in two steps from the commercial 3-amino-9-ethyl carbazole (1) on its reaction in the first step with ethyl succinyl chloride followed by cyclocondensation of the resulting ester 2 with PPA. The selected synthesized compounds were screened for in-vivo analgesic activity using acetic acid induced writhing model in mice. Among them, compound 13was found to be most active and found comparable to standard aspirin.               KEY WORDS: 3-Amino-9-ethyl carbazole, Oxoketnedithioacetal, Dimethyl formamide dimethyl acetal,          2-(Dimethylaminomethylene)ketone, Oxoenolether, Chalcone Bull. Chem. Soc. Ethiop. 2017, 31(1), 93-105.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.8
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • Analysis of the husk and kernel of the seeds of Moringa stenopetala

    • Authors: Y. Melaku, N. Arnold, J. Schmidt, E. Dagne
      Abstract: The ethanol extract of the kernel of the endemic plant Moringa stenopetala after silica gel column chromatography led to the isolation of 4-(α-L-rhamnopyranosyloxy)benzyl glucosinolate (1) and sucrose. The oil obtained by Soxhlet extraction with petrol was trans-esterified with BF3-MeOH and analyzed by GC-MS. The results showed the presence of diverse fatty acids namely palmitic (11%), palmitoleic (1.2%), stearic (11%), oleic (63%), linoleic (1.2%), arachidic (6%) and the rare behenic acids (6%). The white glossy seed husk which comprises 25% of the whole seed yielded two compounds namely 4-(σ-L-rhamnosyloxy)benzyl alcohol (2) and allantoin (3). To the best of our knowledge this is the first report of compound 2 as a natural product. Allantoin is reported here for the first time from the genus Moringa.               KEY WORDS: Moringa, M. stenopetala, 4-(α-L-rhamnopyranosyloxy)benzylglucosinolate, 4-(α-L-rhamnosyloxy)benzyl alcohol, Allantoin Bull. Chem. Soc. Ethiop. 2017, 31(1), 107-113.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.9
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • Effect of biocides and anionic homopolymeric inhibitors on the
           precipitation behavior of calcium fluoride

    • Authors: A. Ur Rehman, A. Khan, M. Humayun, G. Bibi, K. Shi, F. Raziq
      Abstract: This paper describes the effect of biocides and of the anionic homopolymeric inhibitors on the precipitation behavior of calcium fluoride (CaF2).The efficiency of inhibitors in the presence and absence of biocides was calculated using the half-life (t1/2) approach, where 50% of the concentration has been precipitated. Conductometric and X-ray diffraction (XRD) analysis have been performed for the calcium fluoride scale minerals using three polymeric inhibitors and three biocides, which are commonly used in industrial processes. The main aim of the study was to investigate the role of anionic homopolymerspoly(acrylic acid) PAA, and of the oxidizing and non-oxidizing biocides such as; sodium hypochlorite, gluteraldehyde, tris(hydroxymethyl) nitromethane). It was found that addition of low concentration (1-10 mg/L) of the polymers (K-752, K-732 and K-702) have great inhibitory effect on the precipitation of calcium fluoride (CaF2). Their inhibition efficiency was in the order, K-752 > K-732 > K-702. The observed behaviour can be attributed to the effect of molecular weight of the polymer. The polymer having higher molecular weight shows weaker inhibiting ability. However, the oxidizing and non-oxidizing biocides have no appreciable effect on their performance and hence on the overall inhibition process.               KEY WORDS: Calcium fluoride, Precipitation, Inhibition, Homopolymeric inhibitors, Biocides Bull. Chem. Soc. Ethiop. 2017, 31(1), 115-126.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.10
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • A rational synthesis of a novel imidazo[4,5-f][1,10]phenanthroline
           templated Schiff base: Characterization, photoluminescence and DFT/TD-DFT
           study

    • Authors: S. Karslıoğlu, S. Demir, H. Yılmaz, S. Gördük
      Abstract: A new imidazo[4,5-f][1,10]phenanthroline (imp) derivative imidazo-N5,N6-bis((4-(1H-imidazo[4,5-f][1,10]phenanthroline-2-yl)phenyl)methylene)-1,10-phenanthroline-5,6-diamine (impap) was synthesized in five steps starting from bare phenanthroline (phen) precursors. The novel compound was fully characterized by 1H-NMR, IR, elemental analysis and electrospray ionization mass spectroscopy (ESI-MS) techniques. Solid state emission spectrum of impap showed two distinct strong emission maxima with large Stokes shifts. The ground state gas phase geometry of impap was predicted by DFT calculations. Excited state properties of the molecule were examined through TD-DFT calculations conducted at the optimized geometry. Responsible transitions for the strong fluorescence of impap were assigned to single component charge transfer transitions with large oscillator strengths based on the ground state calculated molecular orbital contributions.               KEY WORDS: Phenanthroline, TD-DFT, Photoluminescence, Stokes shift, 1,10-phenanthroline-5,6-dione, Imidazo[4,5-f][1,10]phenanthroline Bull. Chem. Soc. Ethiop. 2017, 31(1), 137-147. 
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.12
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • Radical scavenging activity of some natural tropolones by density
           functional theory

    • Authors: A. G. Al-Sehemi, A. Irfan, A. al Fahad, M. Alfaifi
      Abstract: The ground state neutral geometries of some natural tropolones, i.e. stipitatonic acid (AF1), stipitalide (AF2), stipitaldehydic acid (AF3) and methyl stipitate (AF4) have been optimized by using Density Functional Theory (DFT) at B3LYP/6-31G*, B3LYP/6-31G**, B3LYP/6-31+G* and B3LYP/6-31+G** levels of theory. The excited state geometries of AF1-AF4 were optimized by adopting the Time Dependent Density Functional Theory (TDDFT) at the same levels of theory. The frequencies and cation species of AF1-AF4 were also computed at all the above mentioned levels of theory. We shed light on the electro-optical and molecular properties, e.g. energy gaps, highest occupied molecular orbitals, lowest unoccupied molecular orbitals, absorption wavelengths, electronegativity (χ), hardness (η), electrophilicity (ω), softness (S), electrophilicity index (ωi) and the radical scavenging activity (RSA). Hydrogen atom transfer (HAT) and one-electron transfer mechanisms have been discussed to shed light on the RSA. The smallest ionization potential and bond dissociation energy of AF4 are revealing that this compound would have more RSA than those of other counterparts.               KEY WORDS: Density Functional Theory, Tropolones, Molecular properties, Bond dissociation enthalpy, Adiabatic ionization potential Bull. Chem. Soc. Ethiop. 2017, 31(1), 149-157. 
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.13
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • Formation constants and thermodynamic parameters of bivalent Co, Ni, Cu
           and Zn complexes with Schiff base ligand: Experimental and DFT
           calculations

    • Authors: S. Esmaielzadeh, G. Mashhadiagha
      Abstract: Formation constant (Kf) values of Schiff base ligand, L = methyl-2-{[1-methyl-2-(aceton)ethylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate, with Co(II), Ni(II), Cu(II) and Zn(II) ions has been determined spectrophotometrically for 1:1 complex formation at constant ionic strength 0.01 M (NaClO4), and at various temperatures in DMF solvent. Thermodynamic studies of the complexes have been carried out and their stability were found in the order CoL > CuL > NiL > ZnL. The enthalpy, entropy and Gibbs free energy changes of the complexation reaction have been evaluated from the temperature dependence of the formation constant. Our experimental results revealed that the complexation process is spontaneous, exothermic and entropically unfavorable. Also, B3LYP/(LANL2DZ and 6-311G٭٭) level density functional theory is applied on the structure and stability of Schiff base ligand and their complexes. HOMO-LUMO and binding energies were calculated to obtained stability of the complexes. The theoretical results are compared with experimental data.               KEY WORDS: Metal complexes, Schiff base ligand, Formation constant, DFT calculation Bull. Chem. Soc. Ethiop. 2017, 31(1), 159-170. 
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.14
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • Synthesis and anti-inflammatory evaluation of novel thiadiazol derivatives
           of Mefenamic acid

    • Authors: A. Ahmadi
      Abstract: In the search for new potential non-steroidal anti-inflammatory agents, some novel Mefenamic acid derivatives were synthesized and confirmed by spectroscopic data. The anti-inflammatory activities of these compounds were evaluated by the croton oil-induced ear oedema test in mice. The preliminary pharmacological evaluations indicate that these new compounds showed potent anti-inflammatory activities compare to control and Indomethacin groups.               KEY WORDS: Non-steroidal anti-inflammatory drugs, Mefenamic acid derivatives, Cyclooxygenase, Ear oedema test Bull. Chem. Soc. Ethiop. 2017, 31(1), 171-175.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.15
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
  • One-pot synthesis of 2,4,5-trisubstituted imidazole derivatives catalyzed
           by btppc under solvent-free conditions

    • Authors: M. Alikarami, M. Amozad
      Abstract: A simple and efficient method for one-pot synthesis of lophine derivatives (2,4,5-trisubstituted imidazoles) by using the benzyltriphenylphosphonium chloride (BTPPC), as a catalyst, under solvent-free conditions is described. BTPPC is an available and inexpensive catalyst; also, it can be easily supplied. This procedure led to the corresponding 2,4,5-trisubstituted imidazoles products in high yields.               KEY WORDS: Lophine derivatives, BTPPC, Solvent-free, One-pot synthesis, Multi component synthesis Bull. Chem. Soc. Ethiop. 2017, 31(1), 177-184.
      DOI : http://dx.doi.org/10.4314/bcse.v31i1.16  
      PubDate: 2017-07-19
      Issue No: Vol. 31, No. 1 (2017)
       
 
 
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