Issue 25, 2009

Dynamic solvent effects on the thermal isomerization of zinc dithizonate

Abstract

The pressure dependence of the rate constant for the thermal isomerization of zinc dithizonate was measured at various temperatures in highly viscous solvents, i.e., glycerol triacetate and 2,4-dicyclohexyl-2-methylpentane, as well as in their chemically similar nonviscous solvents, such as methyl acetate and methylcyclohexane. In the nonviscous solvents, the reaction was slightly retarded upon external pressure suggesting the validity of the transition state theory. On the other hand, in the viscous solvents, the reaction, even at ambient pressure, was strongly retarded by an increase in external pressure suggesting the slow thermal fluctuation of the solvent molecules upon external pressure in highly viscous systems. This made it possible to observe the dynamic solvent effects on the isomerization of zinc dithizonate in viscous solvents. The viscosity dependence of the rate constants was rationalized by the two-dimensional reaction coordinate model.

Graphical abstract: Dynamic solvent effects on the thermal isomerization of zinc dithizonate

Supplementary files

Article information

Article type
Paper
Submitted
13 Jan 2009
Accepted
16 Mar 2009
First published
06 Apr 2009

Phys. Chem. Chem. Phys., 2009,11, 5170-5174

Dynamic solvent effects on the thermal isomerization of zinc dithizonate

R. M. Gulam, T. Takahashi and Y. Ohga, Phys. Chem. Chem. Phys., 2009, 11, 5170 DOI: 10.1039/B900706G

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