Nucleophilic substitution reactions of o-catechols with iridium(III) carbonyl complexes: Novel series of functionalized Ir(III) complexes

Article abstract of DOI:10.1016/S0020-1693(00)87308-9

Complexes of Ir(CO)X₂Y(PPh₃)₂: X = Y = I, Cl; X = I, Y = Cl; and [Ir(CO)(CH₃)I(CH₃CN)(PPh₃)₂]⁺ undergo nucleophilic substitutions with o-catechols, yielding a variety of carbonyl-Ir(III)-o-catecholato species. Following a preliminary investigation using tetrabromopyrocatechol and pryocatechol as the reacting ligands, a new series of carbonyl-Ir(III)-(amine- and carboxyl-substituted)-o-catecholates of the type [Ir(CO)X(1,2-O₂C₆H₃-4-R)(PPh₃)₂]; R = CH₂CH₂NH₂ X = I, CH₃; R = CO₂H, X = CH₃; R = CH₂CH₂CO₂H, X = I have been prepared and characterized by elemental analysis, and IR and NMR spectra. The stability of the complexes and the anchoring potentiality of the functionalized derivatives toward a variety of complementary functionalized organic species have been investigated by preparing amide-substituted-o-catecholato species.