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  • 1
    Electronic Resource
    Electronic Resource
    The stability of 12-molybdosilicic, 12-tungstosilicic, 12-molybdophosphoric and 12-tungstophosphoric acids in aqueous solution at various pH (1995)
    Springer
    Catalysis letters 34 (1995), S. 237-244 
    Details
    ISSN: 1572-879X
    Keywords: metal-oxygen cluster compounds ; heteropoly acids ; stability ; pH ; aqueous solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The stabilities of the solid superacids H3Mo12O40, H3PW12O40, H4SiMo12O40 and H4SiW12O40 in aqueous solution have been measured at various values of pH by use of ion chromatographic analyses. The aforementioned acids are completely decomposed at values of pH, 4.0, 5.2, 7.0 and 11.0, respectively. The stabilities in aqueous solution with respect to pH follow the order H4SiW12O40 〉 H3PW12O40 〉 H4SiMo12O40 〉 H3PMo12O40.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808338
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The methyl isocyanide isomerization: A CNDO/2 study with partitioning of energy (1973)
    Springer
    Theoretical chemistry accounts 32 (1973), S. 171-182 
    Details
    ISSN: 1432-2234
    Keywords: Energy partitioning ; Isomerization ; Cyanide ; Methyl isocyanide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract CNDO/2 calculations together with a partitioning of the energy into various one- and two-centre components have been performed on CH3CN, CH3NC, and a large number of nuclear configurations formed by placing the methyl group at various positions with respect to the fixed CN group. A complete potential energy surface was obtained showing that a minimum in energy occurred for a pyramidal CH3 group placed at approximately 90° to the CN axis. The barrier to the reaction CH3NC→CH3CN is calculated as 32.9 kcal, in reasonable agreement with 38.4 kcal, the experimental value of Rabinovitch. A charge separation equivalent to [CH 3 +0.22 ][CN−0.22] is found for the intermediate compared to [CH 3 +0.08 ][CN−0.08] and [CH 3 +0.12 ][NC−0.22] for the cyanide and isocyanide, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00528489
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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