
%0 Journal Article
%A Crea, J 
%A Lincoln, SF 
%A West, RJ 
%T A proton magnetic resonance study of trimethyl phosphate exchange on magnesium(II)
%J Australian Journal of Chemistry
%D 1973/06/01
%V 26
%N 6
%P 1227-1233
%K 
%R https://doi.org/10.1071/CH9731227
%U https://www.publish.csiro.au/paper/CH9731227 
%X A 1H N.M.R. study of the exchange reaction Mg(tmp)62+ &#8596; tmp (tmp, trimethyl phosphate) in methylene chloride and acetone diluents is reported. A complete signal shape analysis is used to derive kinetic parameters. The value for kex (193 K) in the rate law R = 6kex[Mg(tmp)62+] is 3.2±0.5 s-1, &#916;H? = 70.7±3.8 kJ mol-1, and &#916;S? = 135.1±12.6 J mol-1 K-1 when the Mg2+ : tmp : methylene chloride mole ratio is 1.00 : 12.1 : 34.9. Values of similar magnitude are obtained under different mole ratio and diluent conditions. The tmp exchange is considered to proceed through a dissociative mechanism involving solvent structural rearrangement in the activation process. 
