
%0 Journal Article
%A Chan, SC 
%A Leung, PY 
%T Base hydrolysis of <I>trans</I>-Halogenoamminebis(dimethylglyoximato) (III). Complexes
%J Australian Journal of Chemistry
%D 1969/12/01
%V 22
%N 12
%P 2569-2574
%K 
%R https://doi.org/10.1071/CH9692569
%U https://www.publish.csiro.au/paper/CH9692569 
%X The disappearance of trans-[Co(LH)2(NH3)X] (LH = dimethylglyoximate ion, X = chloride or bromide) has been studied in aqueous solutions over a range of alkali concentrations at various temperatures. The kinetics were done with excess of hydroxide ion at a constant ionic strength so that pseudo first-order rate constants were obtained in all the runs. The results were interpreted in terms of the rapid formation of a pre- equilibrium species which then reacts in a rate-determining step to give products. The relatively large equilibrium constants support a conjugate-base pre-equilibrium, in which the proton is lost from oxygen, while the relatively low reactivities of the conjugate-bases are consistent with the absence of electropositive electromeric effects. The similarity in the reactivities of the chloro and the bromo conjugate-bases suggests the possibility of an SN2CB mechanism. 
