title: 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.
authors: Department of Applied Chemistry, Oita University, Dannoharu, Japan.
authors: Rabbani M
authors: RM
authors: Gulam
authors: Toru
authors: T
authors: Takahashi
authors: Yasushi
authors: Y
authors: Ohga
mesh_terms: D002614:Chelating Agents / Q000737:chemistry; D004230:Dithizone / Q000737:chemistry*; D015394:Molecular Structure; D012997:Solvents / Q000737:chemistry; D013696:Temperature; D013816:Thermodynamics; D015032:Zinc / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D012997:Solvents; D004230:Dithizone; D015032:Zinc