
%0 Journal Article
%A Chan, SC 
%A Chan, SF 
%T Octahedral cobalt(III) complexes of the chloropentanimine type. XXX. The thallium(III)-induced aquation of some <I>cis</I>-Halogeno(amine)bis(ethylenediamine)cobalt(III) cations in aqueous solution
%J Australian Journal of Chemistry
%D 1973/06/01
%V 26
%N 6
%P 1235-1238
%K 
%R https://doi.org/10.1071/CH9731235
%U https://www.publish.csiro.au/paper/CH9731235 
%X The second-order rate constants for the thallium(III)-induced aquation of cis-[Co(en)2(RNH2)Cl]2+ cations, where R is H, Me, Et, Prn, and Pri, have been measured in aqueous solution over a range of temperatures, and the activation parameters calculated. The kinetic results are discussed in terms of a rapid pre-equilibrium formation of an activated complex Co-Cl-Tl, followed by a simple rate-determining aquation in which TlCl2+ acts as the leaving group, although the alternative possibility of a rate-determining attack by Tl3+ cannot be excluded. In the case of R = H, the investigations have been extended to the corresponding bromo cation which reacts some 50 times faster than its chloro analogue. 
