INTERACTION OF CYANIDE WITH IRON(II) PHTHALOCYANINE - KINETICS AND EQUILIBRIA

The kinetics and equilibria for the reaction between cyanide and iron(II) phthalocyanine [Fe(pc)] (H-2pc = phthalocyanine) in dimethyl sulfoxide (dmso) were studied at 25-degrees-C. The complex [Fe(pc)(CN)2]2- is formed in two consecutive pseudo-first-order processes with k2f = 17.5 +/- 0.8 dm3 mol-1 s-1 and k3f = 0.20 +/- 0.05 dm3 mol-1 s-1, where k2f and k3f are the rate constants for the binding of the first and second cyanide ligands, respectively. The equilibrium constants were found to be K2 = 3.0 x 10(3) dm3 mol-1 and K3 = 5.7 X 10(2) dm3 mol-1, for the formation of [Fe(pc)(CN)(dmso)]- and [Fe(pc) (C N)2]2-, respectively.