Boris Lokshin - Academia.edu (original) (raw)
Papers by Boris Lokshin
ChemInform
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Spectrochimica Acta Part A: Molecular Spectroscopy
Journal of Raman Spectroscopy, 1988
![Research paper thumbnail of [Isolation and characterization of humin-like substances produced by wood-degrading fungi causing white rot]](https://attachments.academia-assets.com/50750325/thumbnails/1.jpg)
](Prikladnaia biokhimiia i mikrobiologiia
Three samples of high-molecular-weight humin-like substances were obtained by solid-phase cultiva... more Three samples of high-molecular-weight humin-like substances were obtained by solid-phase cultivation of Coriolus hirsutus and/or Cerrena maxima on oat straw. The yield of humin-like substances amounted to 1.38-2.26% of the weight of the plant substrate consumed. These substances, produced both by individual and mixed cultures of the basidiomycetes, were shown to be similar in their structure and physicochemical properties. According to the data of IR and 13C-NMR spectroscopy, the substances contained aromatic fragments and were close to soil humic acids. Studies of the dynamics of laccase production suggested that the humin-like substances were produced bia direct degradation of lignin macromolecules with direct involvement of extracellular laccase.
European Journal of Organic Chemistry, 2000
Titanium complexes 1 derived from chiral salen ligands are highly active precatalysts for the asy... more Titanium complexes 1 derived from chiral salen ligands are highly active precatalysts for the asymmetric addition of trimethylsilyl cyanide to aldehydes and ketones. Based on spectroscopic studies and the identification of adducts between complexes 1 and carbonyl compounds ...
ChemInform, 1999
Phthalocyanine Forms in Reaction of CO 2 with Epoxides.
The vibrational frequencies and force constants for naphthalene (C10H8), 1,4,5,8- and 2,3,6,7-tet... more The vibrational frequencies and force constants for naphthalene (C10H8), 1,4,5,8- and 2,3,6,7-tetradeuterionaphthalenes (C10H4D4), octadeuterionaphthalene (C10D8), and chromium (η6-naphthalene)tricarbonyl were calculated by the DFT method using the PBE approximation in extended and split bases. The results calculated without the use of scaling factors are in good agreement with the IR and Raman experimental data. All vibrational frequencies for the free ligand
Russian Chemical Bulletin, 1994
Raman and IR spectra (4000-50 cm-1) of solid cyclopentadienyl zirconium and hafnium hydrides Cp2M... more Raman and IR spectra (4000-50 cm-1) of solid cyclopentadienyl zirconium and hafnium hydrides Cp2MH2, Cp2MD2, Cp2Zr(H)X, and Cp2Zr(D)X (Cp = ?5-C5H5; M = Zr, Hf; X = Cl, Br) have been studied. The vibrational modes of MH groups, Cp-rings, and metal-ligand bonds are discussed and the band assignments are proposed. In the solid state, these complexes form polymers with linear
![Research paper thumbnail of [Isolation and characterization of humin-like substances produced by wood-degrading fungi causing white rot]](https://attachments.academia-assets.com/40531918/thumbnails/1.jpg)
](Prikladnaia biokhimiia i mikrobiologiia
Three samples of high-molecular-weight humin-like substances were obtained by solid-phase cultiva... more Three samples of high-molecular-weight humin-like substances were obtained by solid-phase cultivation of Coriolus hirsutus and/or Cerrena maxima on oat straw. The yield of humin-like substances amounted to 1.38-2.26% of the weight of the plant substrate consumed. These substances, produced both by individual and mixed cultures of the basidiomycetes, were shown to be similar in their structure and physicochemical properties. According to the data of IR and 13C-NMR spectroscopy, the substances contained aromatic fragments and were close to soil humic acids. Studies of the dynamics of laccase production suggested that the humin-like substances were produced bia direct degradation of lignin macromolecules with direct involvement of extracellular laccase.
Vibrational Spectroscopy, 1995
... 28, 117813 Moscow, Russian Federation b Centro Studi Termodin. Chim. ... Let us first conside... more ... 28, 117813 Moscow, Russian Federation b Centro Studi Termodin. Chim. ... Let us first consider compounds I (Fe, Mn) and II (Fe, Fe) comparing them to the model mononuclear compounds Cp(CO)2FeCH2Ph (VIII) and CpMn (CO)3 (IX). ...
Russian Chemical Bulletin, 1997
Russian Chemical Bulletin, 1998
Catalytic activity of electrochemically reduced forms of mono- and diphthalocyanine complexes of ... more Catalytic activity of electrochemically reduced forms of mono- and diphthalocyanine complexes of transition and rare-earth elements in the reaction of carbon dioxide with epoxides is considerably higher than that of corresponding neutral forms. The catalytic efficiency depends on the nature of the phthalocyanine complex, the method of the catalyst immobilization, and the electrophilicity of epoxide.
Russian Chemical Bulletin, 1997
The addition of CCl4 to hex-1-ene and to the methyl ester ofN-(trans-cinnamoyl)-l-proline (2) cat... more The addition of CCl4 to hex-1-ene and to the methyl ester ofN-(trans-cinnamoyl)-l-proline (2) catalyzed by M3(CO)12 or by the M3(CO)12+DMF system (M=Fe, Ru, Os) was studied. The use of ruthenium and osmium dodecacarbonyls in combination with DMF increases the yields of adducts CCl3CH2CHClC4H9 (4) and PhCHClCH(CCl3)C(O)R′ (3) over those obtained in reactions catalyzed by the same carbonyls without DMF. In addition to adduct3, salts [M(CO3)Cl3]−[Me2NH2]+ were isolated from the products of the reaction between CCl4 and1 in the presence of M3(CO)12+DMF (M=Ru, Os). These salts do not catalyze this reaction and apparently result from chain termination. Experimental results in favor of a coordination mechanism of the addition of CCl4 to olefins in the presence of Ru3(CO)12 and Os3(CO)12 were obtained.
Russian Chemical Bulletin, 1999
The molecular and crystal structures of 4-acetamido-2,3-dimethyl-l-phenylpyrazol-5-one (1) and 4-... more The molecular and crystal structures of 4-acetamido-2,3-dimethyl-l-phenylpyrazol-5-one (1) and 4-nmteylamido-2,3-dimethyl-l-phenylpyrazol-5-one (2) were studied. The molecular conformations are stabilized via systems of intermolecular hydrogen bonds between the amide groups and the carbonyl oxygen atoms of the pyrazolone rings. The conformation of compound 2 is additionally stabilized via an intramolecular interaction between the carboxyl group and the amide oxygen atom. According to the I R spectral data, protonation of the compounds under sttldy in an acetonitrile solution occurs at the carbonyl oxygen atom of the pyrazolone ring, which is also confirmed by the UV spectral data.
Mendeleev Communications, 2001
The paper contents: the brief literature review, the description of technological process of acti... more The paper contents: the brief literature review, the description of technological process of activation of aqueous solutions by lowtemperature plasma in plasmachemical reactor, the brief description of results of mathematical modeling of basic processes in gas-plasma phase, more detailed description of the results of diagnostic of the plasma activated waters by the methods of molecular spectroscopy (nuclear magnetic resonant, Raman, infrared, ultraviolet) and, at last, some application results and future problems. 1. Предыстория проблемы, постановка задач, методология их решения
Inorganica Chimica Acta, 2007
Dihydrohexacyanoferrates (II and III) of aromatic N-heterocyclic cations X + (such as N-methylqui... more Dihydrohexacyanoferrates (II and III) of aromatic N-heterocyclic cations X + (such as N-methylquinoxalinium, pyridinium, dipyridinium) and X 2+ (such as pyridylpyridinium, dipyridinium) are synthesized and characterized. For the first time, the crystal structures of acidic dihydrohexacyanoferrates are described. The formation of the X 2 þ H 2 ½FeðCNÞ 6 and X 2+ H 2 [Fe(CN) 6 ] species which contain the [Fe(CN) 6 ] 4À and [Fe(CN) 4 (CNH) 2 ] 2À anions from acidic solutions occurs after the formation of the H[Fe(CN) 6 ] 3À species as can be established from the outer-sphere charge transfer (OSCT) bands in the absorption spectra. The crystal structures of these species contain extensive network of intermolecular N-HÁ Á ÁN, N-HÁ Á ÁO and O-HÁ Á ÁN hydrogen bonds which link the hexacyanoferrate anions with solvent water (if present) and N-heterocyclic cations if the later can participate in the H-bond formation. In the crystals of dihydrohexacyanoferrates, the H-bond networks can be two-dimensional (species 1) and three-dimensional (species 2-7). The lack of acidic protons for the H-bond network formation can be compensated by solvent water molecules. The H-bond network plays an important role in stabilization of such strongly-acidic species such as the H 2 Bpy 2+ and HPypy 2+ cations and the [Fe II (CN) 4 (CNH) 2 ] 2À anion.
Industrial & Engineering Chemistry Research, 2001
... Nikitin, LN Kinetics of Metalloorganic Compounds Diffusion into Polymers from SupercriticalCa... more ... Nikitin, LN Kinetics of Metalloorganic Compounds Diffusion into Polymers from SupercriticalCarbon ... Covalent Molecular Assembly in a Supercritical Medium: Formation of Nanoparticles Encapsulated in ... a processing solvent for the physical processing of polymeric materials is ...
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2009
The IR and Raman spectra of 3,3-dimethyl-1,2-bis(trimethylsilyl)cyclopropene (I) (synthesised usi... more The IR and Raman spectra of 3,3-dimethyl-1,2-bis(trimethylsilyl)cyclopropene (I) (synthesised using standard procedures) were measured in the liquid phase. Total geometry optimisation was performed at the HF/6-31G* level. The HF/6-31G*//HF/6-31G* quantum mechanical force field (QMFF) was calculated and used to determine the theoretical fundamental vibrational frequencies, their predicted IR intensities, Raman activities, and Raman depolarisation ratios. Using Pulay's scaling method and the theoretical molecular geometry, the QMFF of I was scaled by a set of scaling factors used previously for 3,3-dimethyl-1,2-bis(tert -butyl)cyclopropene (17 scale factors for a 105-dimensional problem). The scaled QMFF obtained was used to solve the vibrational problem. The quantum mechanical values of the Raman activities were converted to differential Raman cross sections. The figures for the experimental and theoretical Raman and IR spectra are presented. Assignments of the experimental vibrational spectra of I are given. They take into account the calculated potential energy distribution and the correlation between the estimations of the experimental IR and Raman intensities and Raman depolarisation ratios and the corresponding theoretical values (including Raman cross sections) calculated using the unscaled QMFF. #
ChemInform
ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Spectrochimica Acta Part A: Molecular Spectroscopy
Journal of Raman Spectroscopy, 1988
Prikladnaia biokhimiia i mikrobiologiia
Three samples of high-molecular-weight humin-like substances were obtained by solid-phase cultiva... more Three samples of high-molecular-weight humin-like substances were obtained by solid-phase cultivation of Coriolus hirsutus and/or Cerrena maxima on oat straw. The yield of humin-like substances amounted to 1.38-2.26% of the weight of the plant substrate consumed. These substances, produced both by individual and mixed cultures of the basidiomycetes, were shown to be similar in their structure and physicochemical properties. According to the data of IR and 13C-NMR spectroscopy, the substances contained aromatic fragments and were close to soil humic acids. Studies of the dynamics of laccase production suggested that the humin-like substances were produced bia direct degradation of lignin macromolecules with direct involvement of extracellular laccase.
European Journal of Organic Chemistry, 2000
Titanium complexes 1 derived from chiral salen ligands are highly active precatalysts for the asy... more Titanium complexes 1 derived from chiral salen ligands are highly active precatalysts for the asymmetric addition of trimethylsilyl cyanide to aldehydes and ketones. Based on spectroscopic studies and the identification of adducts between complexes 1 and carbonyl compounds ...
ChemInform, 1999
Phthalocyanine Forms in Reaction of CO 2 with Epoxides.
The vibrational frequencies and force constants for naphthalene (C10H8), 1,4,5,8- and 2,3,6,7-tet... more The vibrational frequencies and force constants for naphthalene (C10H8), 1,4,5,8- and 2,3,6,7-tetradeuterionaphthalenes (C10H4D4), octadeuterionaphthalene (C10D8), and chromium (η6-naphthalene)tricarbonyl were calculated by the DFT method using the PBE approximation in extended and split bases. The results calculated without the use of scaling factors are in good agreement with the IR and Raman experimental data. All vibrational frequencies for the free ligand
Russian Chemical Bulletin, 1994
Raman and IR spectra (4000-50 cm-1) of solid cyclopentadienyl zirconium and hafnium hydrides Cp2M... more Raman and IR spectra (4000-50 cm-1) of solid cyclopentadienyl zirconium and hafnium hydrides Cp2MH2, Cp2MD2, Cp2Zr(H)X, and Cp2Zr(D)X (Cp = ?5-C5H5; M = Zr, Hf; X = Cl, Br) have been studied. The vibrational modes of MH groups, Cp-rings, and metal-ligand bonds are discussed and the band assignments are proposed. In the solid state, these complexes form polymers with linear
Prikladnaia biokhimiia i mikrobiologiia
Three samples of high-molecular-weight humin-like substances were obtained by solid-phase cultiva... more Three samples of high-molecular-weight humin-like substances were obtained by solid-phase cultivation of Coriolus hirsutus and/or Cerrena maxima on oat straw. The yield of humin-like substances amounted to 1.38-2.26% of the weight of the plant substrate consumed. These substances, produced both by individual and mixed cultures of the basidiomycetes, were shown to be similar in their structure and physicochemical properties. According to the data of IR and 13C-NMR spectroscopy, the substances contained aromatic fragments and were close to soil humic acids. Studies of the dynamics of laccase production suggested that the humin-like substances were produced bia direct degradation of lignin macromolecules with direct involvement of extracellular laccase.
Vibrational Spectroscopy, 1995
... 28, 117813 Moscow, Russian Federation b Centro Studi Termodin. Chim. ... Let us first conside... more ... 28, 117813 Moscow, Russian Federation b Centro Studi Termodin. Chim. ... Let us first consider compounds I (Fe, Mn) and II (Fe, Fe) comparing them to the model mononuclear compounds Cp(CO)2FeCH2Ph (VIII) and CpMn (CO)3 (IX). ...
Russian Chemical Bulletin, 1997
Russian Chemical Bulletin, 1998
Catalytic activity of electrochemically reduced forms of mono- and diphthalocyanine complexes of ... more Catalytic activity of electrochemically reduced forms of mono- and diphthalocyanine complexes of transition and rare-earth elements in the reaction of carbon dioxide with epoxides is considerably higher than that of corresponding neutral forms. The catalytic efficiency depends on the nature of the phthalocyanine complex, the method of the catalyst immobilization, and the electrophilicity of epoxide.
Russian Chemical Bulletin, 1997
The addition of CCl4 to hex-1-ene and to the methyl ester ofN-(trans-cinnamoyl)-l-proline (2) cat... more The addition of CCl4 to hex-1-ene and to the methyl ester ofN-(trans-cinnamoyl)-l-proline (2) catalyzed by M3(CO)12 or by the M3(CO)12+DMF system (M=Fe, Ru, Os) was studied. The use of ruthenium and osmium dodecacarbonyls in combination with DMF increases the yields of adducts CCl3CH2CHClC4H9 (4) and PhCHClCH(CCl3)C(O)R′ (3) over those obtained in reactions catalyzed by the same carbonyls without DMF. In addition to adduct3, salts [M(CO3)Cl3]−[Me2NH2]+ were isolated from the products of the reaction between CCl4 and1 in the presence of M3(CO)12+DMF (M=Ru, Os). These salts do not catalyze this reaction and apparently result from chain termination. Experimental results in favor of a coordination mechanism of the addition of CCl4 to olefins in the presence of Ru3(CO)12 and Os3(CO)12 were obtained.
Russian Chemical Bulletin, 1999
The molecular and crystal structures of 4-acetamido-2,3-dimethyl-l-phenylpyrazol-5-one (1) and 4-... more The molecular and crystal structures of 4-acetamido-2,3-dimethyl-l-phenylpyrazol-5-one (1) and 4-nmteylamido-2,3-dimethyl-l-phenylpyrazol-5-one (2) were studied. The molecular conformations are stabilized via systems of intermolecular hydrogen bonds between the amide groups and the carbonyl oxygen atoms of the pyrazolone rings. The conformation of compound 2 is additionally stabilized via an intramolecular interaction between the carboxyl group and the amide oxygen atom. According to the I R spectral data, protonation of the compounds under sttldy in an acetonitrile solution occurs at the carbonyl oxygen atom of the pyrazolone ring, which is also confirmed by the UV spectral data.
Mendeleev Communications, 2001
The paper contents: the brief literature review, the description of technological process of acti... more The paper contents: the brief literature review, the description of technological process of activation of aqueous solutions by lowtemperature plasma in plasmachemical reactor, the brief description of results of mathematical modeling of basic processes in gas-plasma phase, more detailed description of the results of diagnostic of the plasma activated waters by the methods of molecular spectroscopy (nuclear magnetic resonant, Raman, infrared, ultraviolet) and, at last, some application results and future problems. 1. Предыстория проблемы, постановка задач, методология их решения
Inorganica Chimica Acta, 2007
Dihydrohexacyanoferrates (II and III) of aromatic N-heterocyclic cations X + (such as N-methylqui... more Dihydrohexacyanoferrates (II and III) of aromatic N-heterocyclic cations X + (such as N-methylquinoxalinium, pyridinium, dipyridinium) and X 2+ (such as pyridylpyridinium, dipyridinium) are synthesized and characterized. For the first time, the crystal structures of acidic dihydrohexacyanoferrates are described. The formation of the X 2 þ H 2 ½FeðCNÞ 6 and X 2+ H 2 [Fe(CN) 6 ] species which contain the [Fe(CN) 6 ] 4À and [Fe(CN) 4 (CNH) 2 ] 2À anions from acidic solutions occurs after the formation of the H[Fe(CN) 6 ] 3À species as can be established from the outer-sphere charge transfer (OSCT) bands in the absorption spectra. The crystal structures of these species contain extensive network of intermolecular N-HÁ Á ÁN, N-HÁ Á ÁO and O-HÁ Á ÁN hydrogen bonds which link the hexacyanoferrate anions with solvent water (if present) and N-heterocyclic cations if the later can participate in the H-bond formation. In the crystals of dihydrohexacyanoferrates, the H-bond networks can be two-dimensional (species 1) and three-dimensional (species 2-7). The lack of acidic protons for the H-bond network formation can be compensated by solvent water molecules. The H-bond network plays an important role in stabilization of such strongly-acidic species such as the H 2 Bpy 2+ and HPypy 2+ cations and the [Fe II (CN) 4 (CNH) 2 ] 2À anion.
Industrial & Engineering Chemistry Research, 2001
... Nikitin, LN Kinetics of Metalloorganic Compounds Diffusion into Polymers from SupercriticalCa... more ... Nikitin, LN Kinetics of Metalloorganic Compounds Diffusion into Polymers from SupercriticalCarbon ... Covalent Molecular Assembly in a Supercritical Medium: Formation of Nanoparticles Encapsulated in ... a processing solvent for the physical processing of polymeric materials is ...
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2009
The IR and Raman spectra of 3,3-dimethyl-1,2-bis(trimethylsilyl)cyclopropene (I) (synthesised usi... more The IR and Raman spectra of 3,3-dimethyl-1,2-bis(trimethylsilyl)cyclopropene (I) (synthesised using standard procedures) were measured in the liquid phase. Total geometry optimisation was performed at the HF/6-31G* level. The HF/6-31G*//HF/6-31G* quantum mechanical force field (QMFF) was calculated and used to determine the theoretical fundamental vibrational frequencies, their predicted IR intensities, Raman activities, and Raman depolarisation ratios. Using Pulay's scaling method and the theoretical molecular geometry, the QMFF of I was scaled by a set of scaling factors used previously for 3,3-dimethyl-1,2-bis(tert -butyl)cyclopropene (17 scale factors for a 105-dimensional problem). The scaled QMFF obtained was used to solve the vibrational problem. The quantum mechanical values of the Raman activities were converted to differential Raman cross sections. The figures for the experimental and theoretical Raman and IR spectra are presented. Assignments of the experimental vibrational spectra of I are given. They take into account the calculated potential energy distribution and the correlation between the estimations of the experimental IR and Raman intensities and Raman depolarisation ratios and the corresponding theoretical values (including Raman cross sections) calculated using the unscaled QMFF. #