Structures of cationic di-iridium complexes derived from (η5-C5Me5)Ir(CO)2, including the dication [(η5-C5Me5)(CO)2Ir–Ir(CO)2(η5-C5Me5)]2+ and the bridging methylenetetramethylcyclopentadienyl (tetramethylfulvene) complex [(η5-C5Me5)(CO)Ir–Ir;(CO)2(η5-CH2C5Me4)]+

(η5-C5Me5)Ir(CO)2(1) reacts with Ph3C+ to give the dinuclear dication [(η5-C5Me5)(CO)2Ir–Ir(CO)2(η5-C5Me5)]2+(4) and with (η5-C5Me5)Ir(CO)Cl2 in presence of one equivalent of Ag+ to give [(η5- C5Me5)(CO)(Cl)Ir–Ir(CO)2(η5-C5Me5)]+(2); both (2) and (4) may be converted to the complex [(η5-C5Me5)(CO)[graphic omitted]H2C5Me4)]+(3) containing a rare bridging methylenetetramethylcyclopentadienyl (tetramethylfulvene) ligand.