The effect of site-specific isotopic substitution on transport coefficient of liquid methanol (Articolo in rivista)

Type
Label
  • The effect of site-specific isotopic substitution on transport coefficient of liquid methanol (Articolo in rivista) (literal)
Anno
  • 1989-01-01T00:00:00+01:00 (literal)
Alternative label
  • Weingärtner, H., Holz, M., Sacco, A., Trotta, M. (1989)
    The effect of site-specific isotopic substitution on transport coefficient of liquid methanol
    in The Journal of chemical physics
    (literal)
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  • Weingärtner, H., Holz, M., Sacco, A., Trotta, M. (literal)
Pagina inizio
  • 2568 (literal)
Pagina fine
  • 2574 (literal)
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  • 91 (literal)
Rivista
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  • 7 (literal)
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  • 4 (literal)
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  • Institut für Physikalische Chemie und Elektrochemie der Universität, Kaiserstr. 12, D-7500 Karlsruhe, Germany Dipartimento di Chimica, Università degli Studi Bari, Via Amendola 173, I-70 126, Bari, Italy Isituto per Processi Chimico Fisici (literal)
Titolo
  • The effect of site-specific isotopic substitution on transport coefficient of liquid methanol (literal)
Abstract
  • A new approach is suggested for studying the nature of molecular transport in simple liquids, which makes use of site-specific isotopic substitutions. Its application represents the first systematic experimental study of a theoretically predicted correlation between transport coefficients in liquids and molecular moments of inertia. For this purpose, we have determined the viscosities and self-diffusion coefficients at 25°C of normal methanol and seven isotopically labeled methanol species: CH 3OD, CD 3OH, CD 3OD, CH 2DOH, CHD 2OH, CHD 2OD, and 13CH 3OH. Except for 12C/ 13C substitution, the observed isotope effects are significantly larger than predicted by a square root of mass dependence, but are well correlated with the square roots of the moments of inertia. The results give strong evidence that translation-rotation coupling influences the transport processes in methanol, thus confirming earlier interpretations of isotope effects upon the transport in water. (literal)
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