Kinetics of ethylenediamine exchange in pentacyano(ethylenediamine)ferrate(II)

Abstract

Rate constants (K_–1) and activation parameters for the release of ethylenediamine (en) and monoprotonated ethylenediamine (Hen) co-ordinated to the [Fe(CN)₅]^3– moiety are reported, together with the corresponding stability constants. The rates of formation (k_f) of the complexes have been evaluated indirectly. The results confirm previous predictions of a dissociative mechanism where the basicity of the ligand determines k_–1, whilst only the charge on the ligand effects k_f.