Abstract
Abstract The kinetics of the trans-cis isomerization of [Cr(mal)2(H2O)2]− have been investigated in binary mixed solvents, including methanol-, ethanol-, dioxane-, and acetone-water mixtures. The first-order rate constant increases with a decrease in the volume percentage of the water, but is independent of the kind of organic solvent. The rate is not affected by the addition of any cation to an aqueous solution. These results are in contrast to those for the analogous oxalato complex, and are interpreted in terms of a dissociation mechanism in which the rate-determining step is the dissociation of the coordinating water molecule.
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