Kinetic studies of complexation reaction of polyoxaalkyl phosphates with Fe(III) in ethanol
Complexation reactions of the Fe(III) cation by seven oxaalkyl phosphate esters and ethyl phosphate in ethanol were studied by kinetic methods, as well as 31p NMR and semi-empirical methods. The ΔG≠ values for almost all phosphates were in the range of 53-56 kJ mol-1. The greatest differences were observed for the ΔS≠ values of the systems studied, whereas the enthalpies of activation ΔH≠ were compensated by the entropy of activation. The structures of the complexes formed between the Fe(III) cation and the oxaalkyl phosphate esters and the mechanisms of these reactions are discussed.