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  Subjects -> CHEMISTRY (Total: 871 journals)
    - ANALYTICAL CHEMISTRY (54 journals)
    - CHEMISTRY (610 journals)
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CHEMISTRY (610 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 13)
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: 42)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 20)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 20)
ACS Macro Letters     Full-text available via subscription   (Followers: 25)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 40)
ACS Nano     Full-text available via subscription   (Followers: 267)
ACS Photonics     Full-text available via subscription   (Followers: 13)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 23)
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 Chimica Slovenica     Open Access  
Acta Chromatographica     Full-text available via subscription   (Followers: 8)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 6)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 54)
Advanced Science Focus     Free   (Followers: 5)
Advances in Chemical Engineering and Science     Open Access   (Followers: 65)
Advances in Chemical Science     Open Access   (Followers: 16)
Advances in Chemistry     Open Access   (Followers: 20)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 19)
Advances in Drug Research     Full-text available via subscription   (Followers: 21)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 7)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 25)
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: 43)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 17)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
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: 3)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 61)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 15)
American Journal of Chemistry     Open Access   (Followers: 29)
American Journal of Plant Physiology     Open Access   (Followers: 11)
American Mineralogist     Hybrid Journal   (Followers: 15)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 166)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 238)
Annales UMCS, Chemia     Open Access  
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 5)
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: 9)
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: 13)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 8)
Applied Spectroscopy     Full-text available via subscription   (Followers: 22)
Applied Surface Science     Hybrid Journal   (Followers: 31)
Arabian Journal of Chemistry     Open Access   (Followers: 5)
ARKIVOC     Open Access   (Followers: 1)
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  
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 339)
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: 20)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 7)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 121)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 84)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 2)
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: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 6)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 71)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 9)
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: 18)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 73)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 26)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 22)
Chemical Reviews     Full-text available via subscription   (Followers: 183)
Chemical Science     Open Access   (Followers: 23)
Chemical Technology     Open Access   (Followers: 22)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 7)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 56)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 24)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 32)
Chemistry & Industry     Hybrid Journal   (Followers: 6)
Chemistry - A European Journal     Hybrid Journal   (Followers: 153)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 16)
Chemistry and Materials Research     Open Access   (Followers: 20)
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: 44)
Chemistry of Materials     Full-text available via subscription   (Followers: 248)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 19)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 4)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 11)
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: 11)
Chromatographia     Hybrid Journal   (Followers: 24)
Chromatography     Open Access   (Followers: 2)
Chromatography Research International     Open Access   (Followers: 6)
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: 11)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 6)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 5)
Combustion Science and Technology     Hybrid Journal   (Followers: 22)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 1)
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: 11)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 10)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 3)
Copernican Letters     Open Access   (Followers: 1)
Corrosion Series     Full-text available via subscription   (Followers: 6)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Croatica Chemica Acta     Open Access  
Crystal Structure Theory and Applications     Open Access   (Followers: 4)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Chromatography     Hybrid Journal  
Current Green Chemistry     Hybrid Journal  
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Microwave Chemistry     Hybrid Journal  
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Opinion in Molecular Therapeutics     Full-text available via subscription   (Followers: 14)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 70)
Current Trends in Biotechnology and Chemical Research     Open Access   (Followers: 3)
Dalton Transactions     Full-text available via subscription   (Followers: 23)
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  

        1 2 3 4 | Last

Journal Cover American Journal of Chemistry
  [29 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 2165-8749 - ISSN (Online) 2165-8781
   Published by SAP Homepage  [105 journals]
  • Synthesis, Structural Characterization, and Liquid Crystal Properties of
           Lanthanide Complexes with Schiff Base Ligand
           1,3-bis-[(4-butyloxy-benzylidene)-amino]-propan-2-ol

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 1Khalil Abid, Afnan Abd-AlmonuimNew mesogen Schiff base ligand 1,3-bis-[(4-butyloxy-benzylidene)-amino]-propan-2-ol [L] was synthesized by the reaction of substituted 4-butyloxy benzaldehydeand 1,3-diamino-2-propanol in 2:1 Molar ratio. Four mononuclear lanthanide complexes with (Ln = La(III), Ce(IV), Nd(III) and Gd(III)) were synthesized and characterized by 1HNMR, Fourier transform infrared (FT-IR) spectroscopy, UV – vis, mass spectroscopy, elemental analysis (C.H.N), magnetic susceptibility and molar conductivity measurements. Thermal properties of the title compounds were studied using the thermogravimetric analysis/differential scanning calorimetry (TGA/DSC) and polarizing optical microscopy (POM), the ligand and coordination compounds exhibit liquid crystalline properties.
       
  • Separation and Purification of Lactic Acid from Sisal Wastes

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 1N. Msuya, R. J. A. Minja, J. H. Y. Katima, E. Masanja, A. K. TemuThe aim of this paper was separation and purification of Lactic acid (LA) produced from Sisal Waste by investigating the influence of modified hybrid short path evaporation (M-HSPE) system on the concentration of LA. A 22 full factorial design was used to study the influence of temperature and time on the concentration of LA and % mass obtained in distillate and residue flask. Minitab V.17 was used in designing the LA concentration experiments and in calculating the effect of each variable and their interactions. Higher LA concentration of 108 g/L occurred at system temperature of 47°C for 25 minutes. This represented a concentration of 4.5 times the initial concentration (24 g/L) with 100% recovery in residues stream/ flask. Therefore, the M-HSPE system was able to concentrate LA to almost twice the original hybrid short path evaporation (HSPE) system. According to ANOVA, LA concentration presented a correlation coefficient of 0.993, which confirm that, linear model correlated well with the experimental data. The system temperature (Temp.), operation time (time) and the interaction between system temperature and time were statistically significant variables for LA concentration at alpha = 0.05.
       
  • A Complete and Sustained Clemmensen Reduction Mechanism

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 1Francisco Sánchez-Viesca, Martha Berros, Reina Reina GómezThe mechanism for the Clemmensen reduction is not yet fully understood and there are two principal proposals: the ‘Carbanionic Mechanism’ and the ‘Carbenoid Mechanism’. After a critical review, we present a complete and coherent reaction mechanism that involves the formation of a free carbene as well as a zinc carbene and two different carbanionic species as intermediates. This point of view is based on well known reactivities and eliminates all the wrong, dubious or hindered intermediates suggested in previous proposals.
       
  • Synthesis and Spectroscopic Studies of New Alkoxy Schiff Base Complexes
           Based on Coumarin Moiety

    • Abstract: Publication year: 2018Source: American Journal of Chemistry, Volume 8, Number 1Sinan Al–Bayati, Anaam Rasheed, Enas Zuhair, Khalil Abid, Wessal KhamisA new coumarin derivative with single arm alkoxy Schiff base ligand, (1-{[(3Z)-3-(hydroxyimino)butan-2-ylidene]amino}-4-(octyloxy)quinolin-2(1H)-one) (LH), has been prepared in three steps starting from 4 – hydroxycoumarin and octylbromide to get compound 1 which then reacted with hydrazine hydrate to get compound 2 and finally reacted with 2,3 – butanedione oxime. This ligand was used to prepare new metal complexes with the metal chlorides of NiII, CuII, LaIII, and CeIII. Ligand and metal complexes were characterized and investigated by use of elemental analysis, 1HNMR, FTIR, UV–visible, mass and atomic absorption spectroscopy, molar conductivity, thermal analysis (TGA) and magnetic susceptibility measurements. The collected results showed that the Schiff base ligand was a tridentate chelate (O, N, O) and coordinates to the central LaIII, CeIII ions with 1:2 metal: ligand ratio and 1:1 to NiII, CuII respectively.
       
  • Poly Lactic Acid (PLA) Fibres: Different Solvent Systems and Their Effect
           on Fibre Morphology and Diameter

    • Abstract: Publication year: 2017Source: American Journal of Chemistry, Volume 7, Number 6Muhammad Ashfak Jahangir, Tareque Mahmud Rumi, Md Abdul Wahab, Md Iusuf Khan, Mohammad Arifur Rahman, Zubair Bin SayedMainly poly (lactic acid) (PLA) is a biocompatible thermoplastic aliphatic polymer. Among all of the biodegradable polymer polylactic acid (PLA) is very significant on biomedical and biocompatible field. For the selection of an appropriate non-hazardous solvent or solvent system it’s important to determine the rheological properties and electrospinnability of the solution and the morphology of nanofibres. In this paper we have tried to investigate the solution of poly lactic acid (PLA) in various pure solvents and binary-solvent systems and their effect on different solution properties of nanofibre morphology and diameter. We observed the Nanofibre morphology by scanning electron microscopy (SEM). Compared to other solvent we found acetone/dimethylformamide solvent system gave the highest fibre productivity and finest defect-free nanofibres. Therefore, we also used various solvent ratio for more details. Also the polymer concentration in the solvent has great effect on nanofibre morphology and solution properties. Further investigation of the effect of the PLA concentration on the elastic (G’) and the plastic (G’’) moduli showed a sudden increase of the elastic moduli (G’) at the critical chain entanglement concentration. The results showed that the solvent properties, boiling point, viscosity, conductivity and surface tension, have a significant effect on process productivity, morphology and diameter distribution of the PLA nanofibres.
       
  • Writing Electron Configuration: An Algorithmic Approach

    • Abstract: Publication year: 2017Source: American Journal of Chemistry, Volume 7, Number 5Shahrokh Ghaffari, Shadi Abu-BakerThe goal of the method presented in this paper is introducing students to a simple procedure to arrive at electron configuration and discover its relevance to the Periodic Table. Once that is accomplished, more complicated configuration can be introduced. Writing an electron configuration or electron diagram is an essential topic covered in all introductory chemistry courses. This requirement often proves challenging for certain students. This procedure employs the periodic table as the first step in a multi-step approach that progressively advances students toward the development of an electron diagram. This method is designed specifically for students with little to no background in chemistry. This method can be used both as lecture supplement or a laboratory experiment.
       
  • Preparation and Development of a Novel Activated Carbon based on Moroccan
           Oil Shale Using Activation Process

    • Abstract: Publication year: 2017Source: American Journal of Chemistry, Volume 7, Number 5Nawal Elhammoudi, Mina Oumam, Said Mansouri, Az-iddin Chham, Abdelkrim Abourriche, Hassan HannacheThe objective of this study is the optimization of experimental conditions and the identification of various parameters influencing the preparation of the activated carbon using activation process. The results obtained throughout this work confirm good adsorption capacity of the activated carbon based on Moroccan oil shale. The (SEM) and (FTIR) analysis were used to confirm the adsorption performance of activated carbon from oil shale. Moreover, the Langmuir isotherm showed the best fit with experimental data, the maximum adsorption capacity of cadmium (II) ions was determined to be 55.87 mg/g. The kinetics analysis illustrates that the adsorption processes can be described by the pseudo-first order model.
       
  • Comparative Analysis of Leachable Heavy Metals in Earthenware Clay
           Deposits in the Central and Volta Regions of Ghana

    • Abstract: Publication year: 2017Source: American Journal of Chemistry, Volume 7, Number 4Victus Bobonkey SamlafoThis paper, sought to compare and contrast the potential leachable heavy metals in earthenware clay deposits in the Central and Volta regions of Ghana, using the Atomic Absorption Spectrophotometer (AAS). The study also tried to establish the suitability of which clay deposit is the ideal raw material for earthenware products used as food wares, based on toxic heavy metal and micro nutrient/essential metal levels. The toxic metals determined were Pb, As, Hg, and Cd, while the micronutrients/essential elements examined were Cr, Zn, Mn, Cu, and Fe. The results showed that, apart from Hg and Cr, there was no statistical difference in heavy metal levels in the two regions. Earthenware clay deposits in the two regions were found to be suitable raw materials for food ware products based on their heavy metal levels. The reproducibility of the analytical method was assessed by analysis of the standard reference material IAEA soil-7. The values obtained, compared favourably well with the recommended values as Spearman correlation coefficient was +0.96%. The experimental values were within ± 4% of the recommended values. The measurement precision specified by the relative standard deviation was within ± 5%. The error margins are standard deviations. A two -tailed student’s t-test was used to establish any statistical differences between the mean concentrations of the two earthenware clay deposits. The level of probability at which significant differences existed between the deposits was set at p < 0.05 at 95% confidence level. In general, the two clay deposits were found to be suitable sources of raw materials for food ware products.
       
  • Geochemical Characterization of the Black Shale from the Ama Fatma Coastal
           Site in the Southwest of Morocco

    • Abstract: Publication year: 2017Source: American Journal of Chemistry, Volume 7, Number 5Samira El Aouidi, Said Fakhi, Abdelmourhit Laissaoui, Omar Ait Malek, Moncef Benmansour, Ayoub Ayach, Youness El Batal, Malika Aadjour, Mounia Tahri, Adil El Yahyaoui, Azouz BenkdadApplication of natural geological materials as traps of stable and radioactive metals is part of the overall Moroccan vision for the treatment of radioactive wastes. In this context, the present work focuses on the geochemical characterization of a series of natural black shale samples collected for the Ama Fatma coastal site located in the Moroccan basin of Tarfaya-Boujdour. Major and trace elements were determined by using X-Ray fluorescence and Inductively Coupled Plasma – Mass Spectrometry (ICP-MS). Among the major elements determined, CaO was the most abundant component followed by silicon and iron oxides. Comparison between the obtained results and the geochemical standards indicated that Al, K, Ti, Mg were present in similar concentrations, Ca, Fe, P, and Mg were higher while Si was much lower. The mineralogical composition, determined by X-ray diffraction, showed that the samples were composed essentially of calcite (up to 70%). The predominance of carbonates in the sedimentary environment revealed that the deposition occurred in open marine settings. On the other hand, correlation analysis was carried out in an attempt to establish the elements association and origin, while element ratios were used as indicators of redox conditions, suggesting that the black shale were deposited during anoxic conditions.
       
  • Boranes, Carboranes, Metalloboranes, Transition Metal Carbonyls and Other
           Cluster Formulas Obey the Law of Skeletal Numbers and Their Valences

    • Abstract: Publication year: 2017Source: American Journal of Chemistry, Volume 7, Number 4Enos Masheija Rwantale KiremireThe borane fragments and clusters of nuclearity B1 to B12 have been derived using skeletal numbers and valences. The borane clusters and their relatives strictly obey the law of skeletal numbers and valences. The concept of raw skeletal structures which directly produce the parental cluster formulas has been introduced. Many examples of clusters have been analyzed, characterized and categorized due to the simplicity and accuracy of the method. The geometrical structures’ shapes are sketched in accordance with valences of the skeletal elements and cluster series. The raw skeletal shapes exhibit flexible ranges. The clusters naturally follow a simple numerical mathematical sequence of number series. Of great significance is the revelation that all borane cluster formulas however complex they may look, can readily be derived from a simple mono-skeletal principal fragment [BH], S = 4n+0 and likewise, for the osmium carbonyl clusters can be derived from the simple mono-skeletal principal fragment [Os(CO)3], S = 14n+0(4n+0). The two fragments are isolobal.
       
 
 
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