Register      Login
Australian Journal of Chemistry Australian Journal of Chemistry Society
An international journal for chemical science
RESEARCH ARTICLE

A proton magnetic resonance study of trimethyl phosphate exchange on magnesium(II)

J Crea, SF Lincoln and RJ West

Australian Journal of Chemistry 26(6) 1227 - 1233
Published: 1973

Abstract

A 1H N.M.R. study of the exchange reaction Mg(tmp)62+ ↔ 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, ΔH? = 70.7±3.8 kJ mol-1, and ΔS? = 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.

https://doi.org/10.1071/CH9731227

© CSIRO 1973

Committee on Publication Ethics


Export Citation Get Permission

View Dimensions