DIELECTRIC-RELAXATION OF ELECTROLYTE-SOLUTIONS IN ACETONITRILE

被引：68

作者：

BARTHEL, J

KLEEBAUER, M

BUCHNER, R

机构：

[1] Institut für Physikalische und Theoretische Chemie, Universität Regensburg, Regensburg

来源：

JOURNAL OF SOLUTION CHEMISTRY | 1995年 / 24卷 / 01期

关键词：

DIELECTRIC RELAXATION; COMPLEX PERMITTIVITY; ACETONITRILE SOLUTIONS; ION PAIRING; SOLVATION; LIQUID STATE DYNAMICS;

D O I：

10.1007/BF00973045

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Complex permittivity spectra in the frequency range 0.95 less than or equal to v (GHz) less than or equal to 89 for acetonitrile and its solutions of LiBr, NaI, NaClO4, and Bu(4)NBr at 25 degrees C show one Debye equation for the neat solvent whereas the superposition of a Debye process for the solute and a Cole-Cole distribution for the solvent is necessary to account for the dielectric relaxation behavior of the solutions. The reorientation of bulk acetonitrile is diffusive and only weakly coupled to viscosity. The number of solvent molecules irrotationally bound to the electrolyte is in good agreement with conventional solvation numbers for all electrolytes, when kinetic depolarization is assumed to be negligible. The solute relaxation process is dominated by the formation kinetics and reorientation of contact ion pairs. There is evidence for solvent-shared ion pairs in dilute NaClO4 solutions.

引用

页码：1 / 17

页数：17

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