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  • 1
    Digitale Medien
    Digitale Medien
    Polarography of piazothiol and piazoselenol in aqueous solutions (1966)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 224 (1966), S. 389-406 
    Details
    ISSN: 1618-2650
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Bei der polarographischen Reduktion von Piazothiol und Piazoselenol sowie von Benzofurazan findet ein Übergang von 6 Elektronen statt, wobei o-Phenylendiamin gebildet wird. Dem Übergang des ersten Elektrons geht eine reversible Protonisierung des Moleküls voraus. Selenwasserstoff, der bei der Reduktion von Piazoselenol entsteht, verursacht die anodische Stufe der Quecksilber-Ionisierung. Die Reduzierbarkeit steigt in der Reihenfolge Benzofurazan-Piazothiol-Piazoselenol an, im Gegensatz zu den zunehmenden elektronegativen Eigenschaften der Heteroatome Se-S-O.
    Notizen: Summary The polarographic reduction of piazothiol and piazoselenol, like that of benzofurazan, studied earlier, involves the participation of 6 electrons and the formation of ortho-phenylenediamine. The transfer of the first electron is preceded by a reversible protonation of the molecules. Hydrogen selenide formed in the reduction of piazoselenol gives the anodic wave of mercury ionization. Reducibility increases in the series: benzofurazan, piazothiol, piazoselenol in contrast to the increase in electronegativity of the key heteroatoms Se, S, O.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00502668
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  • 2
    Digitale Medien
    Digitale Medien
    Polarography of organohalogen compounds Report 3. Polarography of α-1,2,3,4,5,6-hexabromocyclohexane and paradiiodobenzene (1964)
    Springer
    Russian chemical bulletin 13 (1964), S. 903-907 
    Details
    ISSN: 1573-9171
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Conclusions 1. The method of latent limiting currents was used to establish the stoichiometry of the reactions of the electrochemical reduction ofα-1, 2, 3,4, 5, 6-hexabromocyclohexane and para-diiodobenzene. 2. In the six-electron reduction ofα-hexabromocyclohexane, hydrogen ions are not consumed, and six bromine ions arise, i.e., the reduction proceeds with the formation of benzene. In the four-electron reduction of para-diiodobenzene in a 0.5 M ethanol solution of (CH3)4NCl, two hydrogen ions are consumed, i.e., stripping of both iodine atoms occurs. Against a background of 0.1 M LiClO4 stripping of the iodine atoms occurs at different potentials. 3. The difference in the behavior of para-diiodobenzene in different solutions is explained by the influence of the structure of the electric double layer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01141639
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  • 3
    Digitale Medien
    Digitale Medien
    Polarography of diiodoacetylene (1965)
    Springer
    Russian chemical bulletin 14 (1965), S. 510-512 
    Details
    ISSN: 1573-9171
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary 1. By the method of latent limiting currents based on the hydrogen ion it was shown that hydrogen ions do not take part in the electrochemical reduction of diiodoacetylene at the dropping-mercury cathode. 2. The diiodoacetylene wave corresponds to two-electron reduction with cleavage of both iodine atoms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00846615
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  • 4
    Digitale Medien
    Digitale Medien
    Polarography of solutions simultaneously containing elementary sulfur and divalent iron (1965)
    Springer
    Russian chemical bulletin 14 (1965), S. 952-955 
    Details
    ISSN: 1573-9171
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Conclusions 1. The reduction of sulfur in the presence of Fe +2 ions was studied. Two new waves and an earlier rise in the current were detected in this system. 2. The experimental data were explained using the concepts of the interaction both of HgS and of FeS in two different waves, with the formation of S -2 ions on one, and HS- ions (or H2S) on the other.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00845734
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  • 5
    Digitale Medien
    Digitale Medien
    Operators of Carleman type (1968)
    Springer
    Siberian mathematical journal 9 (1968), S. 616-621 
    Details
    ISSN: 1573-9260
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02199096
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  • 6
    Digitale Medien
    Digitale Medien
    Investigations in the field of aromatic heterocycles (1971)
    Springer
    Chemistry of heterocyclic compounds 4 (1971), S. 523-527 
    Details
    ISSN: 1573-8353
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Piazthiole and piazselenole, like benzofurazan, studied previously, are reduced at the dropping mercury electrode with the consumption of six electrons and with the formation of o-phenylenediamine. The transfer of the first electron in acid solutions is preceded by the reversible protonation of the molecules. The ease of reduction rises in the sequence benzofurazan, piazthiole, piazselenole in accordance with a fall, and not with a rise, in the electronegativity of the key heteroatoms O, S, Se and with the decrease in the dipole moments of the corresponding molecules. The presence of two waves in the polarogram of piazselenole is due not to the stagewise nature of its reduction but to the anodic dissolution of mercury in the presence of hydrogen selenide.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00486777
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  • 7
    Digitale Medien
    Digitale Medien
    Electrochemical reduction of Ni(II) phosphine and phosphite complexes (1980)
    Springer
    Russian chemical bulletin 29 (1980), S. 1093-1098 
    Details
    ISSN: 1573-9171
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Conclusions 1. The formation of stable pentacoordinated complexes of Ni halides and nitrate has been demonstrated in the presence of a 100-fold excess of the phosphines and phosphites in ethanol and CH3CN. 2. A wave shift to a region of less negative potentials in the displacement of complex-formation equilibrium by an excess concentration of organic ligand was determined by the greater stability of the [NiL4] complexes formed on reduction. 3. Two-electron quasireversible reduction of the compounds studied leads to formation of Ni(0) phosphine and phosphite complexes with a coordination number of 4 and 3.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00949160
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  • 8
    Digitale Medien
    Digitale Medien
    Structure of cyclopentadienyl chelate complexes of zirconium of the types Cp2Zr(chel)X and Cp2Zr(chel)X·H2O (1981)
    Springer
    Russian chemical bulletin 30 (1981), S. 578-583 
    Details
    ISSN: 1573-9171
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary 1. Conductometric, polarographic, and NMR spectroscopic data are consistent with the hypothesis of a five-coordinate trigonal-bipyramidal structure for Cp2Zr(C15H11O2)X-type complexes and a six-coordinate octahedral structure for Cp2Zr(chel)Br·H2O-type ones. 2. It was shown by13C-{1H} NMR and PMR spectroscopy that the investigated five- and sixfold coordination complexes exist in solution in the form of a mixture of isomers which undergo interconversion with changing temperature or on keeping. 3. Sixfold coordination complexes in CDCl3 solution exist mainly in the form of the trans isomer.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00949717
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  • 9
    Digitale Medien
    Digitale Medien
    Cyclopentadienyl complexes with hafnium and zirconium containing nitrate ligands (1983)
    Springer
    Russian chemical bulletin 32 (1983), S. 1265-1270 
    Details
    ISSN: 1573-9171
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Conclusions 1. New types of hafnium monocyclopentadienyl nitrate complexes, CpHf(DBM)(NO3)2 and CpHfCl2(NO3)·4H2O (DBM is dibenzoylmethane residue) were synthesized. 2. Dichlorides CpMCl2(NO3) are formed in the reaction of monochlorides CpM(chel)2Cl with HNO3 as the result of the reaction of HCl thus evolved with the exchange product CpM· (chel)2(NO3). 3. From a study of the electrical conductivity, IR, and Raman spectra, the nonionic character of the metal-nitrate bonds and bidentate character of the nitrate ligands in Cp2M· (NO3)Cl have been assumed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00953170
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  • 10
    Digitale Medien
    Digitale Medien
    Electrochemical study of nickel complexes in Ziegler-type catalytic systems (1984)
    Springer
    Russian chemical bulletin 33 (1984), S. 1186-1189 
    Details
    ISSN: 1573-9171
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Conclusions By electrochemical methods, it was shown that σ-organonickel complexes stabilized by organoaluminum compounds are present in homogeneous three-component systems consisting of NiX2 (X=Cl or acac), an organophosphorus activator [PR3, P(OR)3, where R=Et, i-Pr, Bu,Ph], and an organoaluminum reducing agent.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00948984
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