The kinetics of the reaction between manganese pentacarbonyl bromide and β-alanine

Abstract

Manganese pentacarbonyl bromide reacts with β-alanine to give manganese tricarbonyl bis-(β-alanine) bromide. The kinetics of this reaction are described, the first step under thermal and the second under photochemical conditions. Rate constants in 50% aqueous methanol and in 50% aqueous dimethyl sulphoxide, and the activation enthalpy, entropy, and volume for the first step in 50% aqueous methanol are reported. The kinetics results suggest dissociative mechanisms for both stages, though there are some unusual features of the first step. Some rate constants for the reactions of manganese pentacarbonyl bromide with glycine and of rhenium pentacarbonyl bromide with β-alanine are also given.