Kinetics and mechanism of the substitution reactions of the four-(X = Cl) and five-co-ordinate (X = I or SCN) iridium complexes [(cyclo-octa-1,5-diene)Ir(1,10-phenanthroline)X]

Abstract

The substitution reaction of the five-coordinate [(cod)Ir(phen)X](cod = cyclo-octa-1,5-diene, phen = 1,10-phenanthroline, X = I or SCN) with ethylenediamine (en) proceeds via a dissociative mechanism; the reaction between [(cod)Ir(phen)]⁺ and en shows the accumulation of either a four- or five-co-ordinate intermediate [(cod)Ir(phen)(en)]⁺.