
%0 Journal Article
%A Buckingham, DA 
%A Clark, CR 
%A Stewart, I 
%T Chelation and Hydrolysis of Orthophosphate Coordinated to Cobalt(III). Reactions of [Co(en)<sub>2</sub>(O<sub>2</sub>PO<sub>2</sub>)] Under Alkaline Conditions
%J Australian Journal of Chemistry
%D 1989/05/01
%V 42
%N 5
%P 709-715
%K 
%R https://doi.org/10.1071/CH9890709
%U https://www.publish.csiro.au/paper/CH9890709 
%X Ring opening and closing under alkaline conditions of the four-membered orthophosphate chelate [Co(en)2(O2PO2)] has been followed by both visible absorption and 31P n.m.r. spectroscopy. The former reaction follows the rate law khyd = k2+kl[OH-] with k2 = 2.2 &#215; 10-5 s-1 and k1 = (1.63 ± 0.04)&#215;10-2 mol-1 dm3 s-1, and ring closure the rate law kch = k-2 + k-1 with k-2 = 6&#215;10-4 s-1 for cis -[Co(en)2(OH)(OPO3H)1 and k-1 = 7.5&#215;10-5 s-1 for cis-[Co(en)2(OH)(OPO3)]-, all at 25&#176;C and I = 1.0 mol dm-3 (NaNO3).trans- Monodentate species adopt higher concentrations than cis-monodentate species at equilibrium under all alkaline conditions. 
