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CHEMICAL ENGINEERING (235 journals)            First | 1 2     

Showing 201 - 236 of 236 Journals sorted alphabetically
Nanochemistry Research     Open Access   (Followers: 1)
Natural Volatiles & Essential Oils     Open Access  
Noise Control Engineering Journal     Full-text available via subscription   (Followers: 4)
npj Science of Food     Open Access  
Ochrona Srodowiska i Zasobów Naturalnych : Environmental Protection and Natural Resources     Open Access  
Open Chemical Engineering Journal     Open Access  
Periodica Polytechnica Chemical Engineering     Open Access  
Petroleum Chemistry     Full-text available via subscription   (Followers: 1)
Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B     Full-text available via subscription  
Plasma     Open Access   (Followers: 3)
Plasma Processes and Polymers     Hybrid Journal   (Followers: 2)
Polymer     Hybrid Journal   (Followers: 86)
Polymer Bulletin     Hybrid Journal   (Followers: 6)
Polymer Composites     Hybrid Journal   (Followers: 18)
Polyolefins Journal     Open Access  
Powder Technology     Hybrid Journal   (Followers: 13)
Reaction Chemistry & Engineering     Hybrid Journal  
Reactions     Open Access  
Research on Chemical Intermediates     Hybrid Journal   (Followers: 3)
Revista Cubana de Química     Open Access  
Revista ION     Open Access  
Revista Mexicana de Ingeniería Química     Open Access  
Russian Chemical Bulletin     Hybrid Journal   (Followers: 3)
Russian Journal of Applied Chemistry     Hybrid Journal  
Solid Fuel Chemistry     Hybrid Journal  
South African Journal of Chemical Engineering     Open Access   (Followers: 3)
Surface Engineering and Applied Electrochemistry     Hybrid Journal   (Followers: 7)
Sustainable Chemical Processes     Open Access   (Followers: 3)
Synthesis Lectures on Chemical Engineering and Biochemical Engineering     Full-text available via subscription  
The Canadian Journal of Chemical Engineering     Hybrid Journal   (Followers: 5)
The Chemical Record     Hybrid Journal   (Followers: 1)
Theoretical Foundations of Chemical Engineering     Hybrid Journal   (Followers: 3)
Transition Metal Chemistry     Hybrid Journal   (Followers: 6)
Transylvanian Review of Systematical and Ecological Research     Open Access  
Upstream Oil and Gas Technology     Open Access   (Followers: 1)
Visegrad Journal on Bioeconomy and Sustainable Development     Open Access   (Followers: 1)

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Russian Chemical Bulletin
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1573-9171 - ISSN (Online) 1066-5285
Published by Springer-Verlag Homepage  [2469 journals]
  • VI International Scientific Conference “Advances in Synthesis and
           Complexing”

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      PubDate: 2022-07-01
       
  • General Meeting of the Division of Chemistry and Materials Sciences of the
           Russian Academy of Sciences

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      PubDate: 2022-07-01
       
  • Unexpected results of the reactions of manganese and vanadium
           β-diketiminate halide complexes with Na[HBEt3]

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      Abstract: Abstract The reaction of [(MenacnacDipp)Mn(μ-Cl)]2(2) (MenacnacDipp = HC(C(Me)NDipp)2; Dipp = 2,6-Pri2C6H3) with sodium triethylborohydride in a toluene—THF mixture afforded the complex [(MenacnacDipp)Mn(μ-H)2BEt2(THF)] (3). The reaction of 2 with Na[HBEt3] in toluene under THF-free conditions gave a mixture of products. The set and the ratio of these products in the resulting crystalline mixture were established by quantitative powder X-ray diffraction analysis: [(MenacnacDipp)Mn(μ-H)]2(1), [(MenacnacDipp)−Mn(μ-H)2BEt2] (4), and unreacted compound 2 in the ratio of 15:4:1 and traces of an unknown crystalline phase. The reaction of [(MenacnacDipp)VCl2] (5) with Na[HBEt3] yielded the compound [(MenacnacDipp)V(μ-H)(μ,κ1:1−C:C′−C2H4)BEt2] (6) containing the unusual ligand [HBEt2(CH2CH2)]2−. The vanadium analog of compound 3, [(MenacnacDipp)V(μ-H)2BEt2(THF)] (7), was isolated in one experiment. Besides. a small amount of the complex [(MenacnacDipp)V(μ-H)BEt3(THF)] (8) was detected in the mixture of crystalline products. The structures of compounds 3, 4, 6, 7, and 8 were determined by single-crystal X-ray diffraction.
      PubDate: 2022-07-01
       
  • Nitronyl-nitroxide PCP-pincer complexes of palladium and nickel: synthesis
           and an EPR study

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      Abstract: Abstract The possibility of the application of nitronyl-nitroxide ligand (NIT) as a spin label for the study of the composition of transition metals complexes with M-NIT bonds by EPR spectroscopy was explored using PCP-pincer complexes of Pd and Ni as examples.
      PubDate: 2022-07-01
       
  • Hydrazine-mediated C-O bond reductive cleavage in some bis- and
           mono-O-substituted derivatives of 4-tert-butylcalix[4]arene

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      Abstract: Abstract Novel di- and tetra-substituted calix[4]arene derivatives bearing diacetylene moieties at the lower rim of macrocycle were synthesized via the Mitsunobu and Williamson reactions. The dealkylation of diacetylene moieties of calix[4]arene was for the first time discovered in the DMSO—hydrazine hydrate system. An important role in the dealkylation of diacetylene moieties is played by neighboring unsubstituted OH groups at the macrocycle. Blocking of OH groups with butyl substituents and elongation of the linker between the butadiynyl fragments and the macrocyclic platform significantly reduce the affinity of macrocycle to reductive cleavage. The unique reactivity of calix[4]arene in its reaction with hydrazine hydrate was demonstrated in comparison with a model conjugate of diacetylene with 4-tert-butylphenol. The reductive cleavage may proceed via the formation of pyrazole derivative of calix[4]arene. Pyrazole derivatives were the most reactive ones in the reaction with hydrazine hydrate among the studied isostructural calixarenes containing an active α-arylmethyleneoxy moiety. Results of performed quantum chemical calculations allowed us to propose a scheme for the reductive cleavage of oxymethylene derivatives of pyrazole with hydrazine hydrate.
      PubDate: 2022-07-01
       
  • Synthesis, structure, and magnetic properties of the iron(iii) iodide
           complex with the 3,5-di-tert-butylcatecholate ligand

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      Abstract: Abstract The reaction of iron(ii) iodide with 3,5-di-tert-butyl-o-benzoquinone (3,5-DBBQ) in anhydrous diethyl ether afforded the heteroleptic binuclear complex [Fe2I2(3,5-DBCat)2(Et2O)2] (1) (3,5-DBCat is 3,5-di-tert-butylcatecholate). The crystal structure of the newly synthesized compound 1 was determined by single-crystal X-ray diffraction analysis, and its phase purity was confirmed by powder X-ray diffraction. Quantum chemical calculations indicate that the iron(III) ions are in the high-spin state and the redox-active ligand is in the dianionic catecholate form. Magnetochemical measurements of 1 in the temperature range of 2–300 K revealed intramolecular antiferromagnetic exchange interactions between FeIII ions, which is consistent with quantum chemical calculations.
      PubDate: 2022-07-01
       
  • Temperature dynamics of magnetoactive compounds under terahertz
           irradiation: characterization by an EPR study

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      Abstract: Abstract A possibility of fast rapid temperature changing for the studied compound makes it possible to study related phenomena, such as thermally induced trapping of metastable states in magnetoactive compounds and thermally activated catalytic and biological processes. The Electron Paramagnetic Resonance (EPR) spectroscopy station at the Novosibirsk Free Electron Laser (NovoFEL) allows one to study effects of powerful terahertz (THz) radiation on the spin state of paramagnetic systems. A change in the sample temperature as a result of radiation absorption is an inevitable consequence of such an exposure. However, the sample heating at the NovoFEL EPR station itself is of interest due to the record power of THz radiation and small sizes of the samples used. A combination of these two factors can provide a significantly high heating rate. The magnetoactive complex [Cu(hfac)2LEt] was chosen as a model system for studying the heating process, since the complex has a magnetostructural transition at ∼125 K with substantially different spin states above and below the transition temperature. The heating processes with the amplitudes above 60 K were studied, the heating and cooling rates of the sample in similar experiments were estimated, and prospects for using the method to study various thermally induced effects are discussed.
      PubDate: 2022-07-01
       
  • 2,4,5,6-Substituted 4,5-dihydro-1,2,4,5-tetrazin-3(2H)-ones as
           non-classical initiators of controlled radical polymerization of styrene

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      Abstract: Abstract A series of 2,4,5,6-substituted 4,5-dihydro-1,2,4,5-terazin-3(2H)-ones are studied as initiators of controlled radical polymerization of styrene at 100 and 120 °C. It has been established that not only electronic effects of substituents, but also other factors have a significant effect on the process, including the probability of side reactions of the verdazyl radical with the monomer, but not with the growing chain. In the course of experiments, high molecular weight polystyrene was obtained in a short time at moderate temperatures, which indicates high prospects for the use of verdazyl-based initiators in the controlled polymerization of olefins.
      PubDate: 2022-07-01
       
  • Effect of ATP and amino acids on the properties of cationic amphiphiles in
           solution and on the surface

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      Abstract: Abstract The interaction between a number of cationic surfactants bearing the head group with different structures (triallyl, morpholinium, including hydroxyethyl-substituted) with oppositely charged biomolecules (amino acids and sodium adenosine triphosphate (ATP)) was studied. The amino acid additives (glycine, lysine, histidine, arginine) do not affect the aggregation behavior of the tested cationic surfactants. However, in some combinations, they can significantly increase their solubilization capacity. The ATP additive already in a minimum amount decreases the critical micelle concentration of the surfactant by an order of magnitude, and the solubilization capacity depends on the structure of the surfactant head group.
      PubDate: 2022-07-01
       
  • Molecular and electronic structures of paramagnetic gallium complexes with
           differently charged o-quinone ligands

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      Abstract: Abstract A series of new paramagnetic six-coordinate gallium complexes based on 3,6-di-tert-butyl-o-benzoquinone with N-donor ligands, such as pyridine (Py), 2,2′-dipyridyl (2,2′-dipy), and 4,4′-di-tert-butyl-2,2′-dipyridyl (But-dipy), were synthesized and structurally characterized. The molecular structures of the synthesized compounds were established by single-crystal X-ray diffraction. The complexes with bidentate N-donor ligands have the cis arrangement of the o-quinone ligands, whereas the compound with coordinated pyridine molecules has the trans arrangement of the diolate moieties. The synthesized compounds are characterized by spin density delocalization between the differently charged redox-active ligands. Regardless of the metal coordination environment, the near-IR region of the electronic absorption spectra of all the synthesized complexes show a low-intensity charge-transfer band between the catecholate and o-semiquinolate ligands, which was confirmed by DFT calculations.
      PubDate: 2022-07-01
       
  • Copper(ii) and manganese(ii) complexes based on a new N,O-chelating ligand
           bearing the 1,3,5-diazaphosphorinane moiety

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      Abstract: Abstract Copper(ii) and manganese(ii) chelate complexes were synthesized using the new N,O-hybrid ligand 1,3-dibenzhydryl-5-(pyridin-2-yl)-1,3,5-diazaphosphinane 5-oxide. The synthesized complexes were characterized by physicochemical methods. The molecular and crystal structures of the complexes were established by X-ray diffraction. All new compounds were evaluated for cytotoxicity against the cancer cell lines M-HeLa and HuTu80 and the normal cell line Chang liver.
      PubDate: 2022-07-01
       
  • Synthesis of 5-(4-bromophenyl)- and 5-(5-bromothiophen-2-yl)-substituted
           3-aryl[1,2,4]triazolo[4,3-c]quinazolines

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      Abstract: Abstract A series of [1,2,4]triazolo[4,3-c]quinazolines, bearing 3-positioned p-bromophenyl or 5-bromothiophen-2-yl fragment, was synthesized by oxidative cyclization of the corresponding hydrazones with bromine in glacial acetic acid at room temperature. The obtained tricyclic derivatives are valuable intermediates for biologically active compounds and fluorophores.
      PubDate: 2022-07-01
       
  • On the origin of non-Markovian kinetics of light-induced
           magneto-structural relaxation in “breathing” crystals

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      Abstract: Abstract Traditional mean-field theory of light-induced magneto-structural relaxation in spin-crossover compounds provides a qualitatively correct explanation for the non-Markovian self-accelerating character of the experimentally observed kinetics of the process. The relaxation kinetics of “breathing” crystals is often also of non-Markovian character, being, however, self-decelerating. In this work the self-decelerating kinetics of light-induced magneto-structural relaxation is explained using a kinetic analysis of the concentration profile of photoexcited Jahn—Teller exchange clusters in “breathing” crystals of finite thickness. The results obtained are also equally applicable to the kinetics of light-induced relaxation of classical spin-crossover systems.
      PubDate: 2022-07-01
       
  • Single-crystal X-ray diffraction analysis of arylamine-containing
           2,2′-bipyridine derivatives

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      Abstract: Abstract The structures of six 2,2′-bipyridine derivatives containing aromatic amine moieties, namely N-aryl-4-aryl-1-(pyridin-2-yl)-6,7-dihydro-5H-cyclopenta[c]pyridine-3-amines, were studied by single-crystal X-ray diffraction. The molecular structures and the effect of the substituents of these compounds on the crystal packing are discussed.
      PubDate: 2022-07-01
       
  • Stereoselective synthesis of dihydropyrimidinethione podand in the
           presence of l-proline or 4-hydroxy-l-proline and metal nitrates

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      Abstract: Abstract The asymmetric Biginelli reaction involving a 3-oxobutanoyl-containing podand, benzaldehyde, and thiourea was studied using secondary amines as a chiral inductor, Brönsted acid as a catalyst, and metal salts (especially metal nitrates) as an additive of asymmetric catalysis (AAC) was studied. The tuberculostatically active dihydropyrimidine-thione-containing podand was synthesized with an enantiomeric excess of 57% in the presence of 4-hydroxy-l-proline. In the presence of metal nitrates, the influence of the ionic radius of the cation on the enantioselective excess of the reaction under study was observed, which made it possible to propose a possible mechanism of chiral induction controlled by the complexing ability of the initial β-ketoester-containing podand with metal ions and coordination of the reagents in the transition states.
      PubDate: 2022-07-01
       
  • A relationship between the coordination octahedron parameters and ligand
           conformation during spin transition in the cationic complex [N,
           N′-3,6-diazaoctane-1,8-diylbis(salicylidenaldiminato)]iron(iii)
           [FeIII(Sal2trien)]+

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      Abstract: Abstract Magnetostructural relationships between the spin state of the FeIII ion, conformations of the ethylene bridges (-CH2-CH2-) in the five-membered chelates of the ligand, and Fe-N/O bonds were constructed due to an analysis of the literature data for 29 structures based on the [N,N′-3,6-diazaoctane-1,8-diylbis(salicylidenaldiminato)]iron(iii) [FeIII(Sal2trien)]+ (H2Sal2trien is the hexadentate ((Nam)2(Nim)2O2) Schiffbase, condensation product of triethylenetetramine and salicylaldehyde). According to the analysis results for the dependences of the Fe-N bond lengths on the fraction of the high-spin state (γHS, S = 5/2), the Fe-Nam and Fe-Nim bonds depend most strongly on the change in γHS, since the donor N atoms are characterized by high σ-overlapping with the d-orbitals of the metal ion. The conformational switch of the ethylene bridges of the ligand occurs in the range 40% < γHS < 85% at the relative elongations of the Fe-Nam and Fe-Nim bonds equal to 4.0–8.5% and 3.4–8.6%, respectively. Relationships were revealed between the γHS values and ratios of high- and low-spin conformers of the complex cation in the unit cell. The scatter of bond length values was found in the polyhedron FeN4O2 to 4% at γHS = 0% and to 5% γHS = 100%, which is caused by the effect of the crystalline environment of the complex cation. The determined features of the structural rearrangement of the hexadentate macrocyclic ligand of the Saltrien type can be used as a criterion for the estimation of γHS and development of molecular design of FeIII compounds with controlled spin transition.
      PubDate: 2022-07-01
       
  • Oximes of fluoroalkyl-containing 1,3-diketones: specific features of
           synthesis, analysis, and thermal stability

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      Abstract: Abstract Nitrosation of lithium 1,3-diketonates bearing fluoroalkyl and aryl (or hetaryl) substituents in positions 1 and 3 results in 3-polyfluoroalkyl-1,2,3-propanetrione 2-oximes (from this point on, oximes). Under similar conditions, lithium (Z)-1,1,1-trifluoro-4-oxo-4-(thien-2-yl)-2-buten-2-olate forms a hydration product of the corresponding oxime. Nitrosation of fluoroalkyl-containing lithium 1,3-diketonates is accompanied by retro-decomposition of the initial lithium 1,3-diketonates and the target oximes (or their hydration products) followed by oxidation and hydrolysis of the reaction products. Under the GC-MS conditions, the oximes undergo partial thermal decomposition to 2-aryl(hetaryl)-2-oxoethanenitriles. An analysis of solutions of the oximes in DMSO-d6 by 1H and 19F NMR spectroscopies revealed isomerization and hydration of these compounds. The temperature ranges of stability of the oximes were determined by thermogravimetric analysis and differential thermal analysis. The molecular and crystal structures of 4,4-difluoro-1-(4-methoxyphenyl)-1,2,3-butanetrione 2-oxime and 4,4,4-trifluoro-1-(thien-2-yl)-1,2,3-butanetrione 2-oxime were determined by X-ray diffraction.
      PubDate: 2022-07-01
       
  • Design of a bismuth ferrite nanocomposite in a polysaccharide matrix

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      Abstract: Abstract Bismuth ferrite nanobiocomposites obtained using a natural polysaccharide were studied. The morphology of new self-organizing nanobiocomposites, which were dispersed in water, was studied, and the sizes of bismuth ferrite nanoparticles were determined and found to vary in the range of 10–45 nm. The temperature dependence of magnetization of the bismuth ferrite-based nanocomposite with spatially separated particles and the dependencies of magnetization on the external magnetic field at temperatures 5 and 320 K were determined.
      PubDate: 2022-07-01
       
  • Oxidation of benzyl alcohol in the copper-doped ZIF-8 metal-organic
           framework with encapsulated nitroxyl radical

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      Abstract: Abstract A novel heterogeneous catalytic system based on the TEMPO nitroxyl radical encapsulated into the cavities of copper-doped ZIF-8 metal-organic framework was synthesized and characterized using ESR spectroscopy and powder X-ray diffraction. This system provided a highly selective (>99%) oxidation of benzyl alcohol to benzaldehyde.
      PubDate: 2022-07-01
       
  • Synthesis of o-benzoquinones annulated with
           2-thioxo-1,3-dithiole-4,5-dithiolate fragment. Dioxolene ligands bearing
           non-planar geometry

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      Abstract: Abstract A procedure has been developed for the annulation of a 2-(thi)oxo-1,3-dithiole-4,5-dithiolate fragment to 3,6-di-tert-butyl-o-benzoquinone. The resulting o-quinones have a significant asymmetry with respect to the plane of the chelate dioxolene site, which can be used in the targeted design of the coordination environment of metal ions in complexes. Isomeric manganese adducts containing dioxolene, carbonyl, and phosphine ligands, which differ in the location of the asymmetric o-quinone ligand, have been characterized by EPR spectroscopy.
      PubDate: 2022-07-01
       
 
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