 Typical is the synthesis of IrCl(CO)(PPh3)2 from the reaction of iridium(III) chloride and triphenylphosphine in boiling DMF solution.Salt metathesis reaction of for example KCo(CO)4 with [Ru(CO)3Cl2]2 leads selectively to mixed-metal carbonyls such as RuCo2(CO)11.The synthesis of ionic carbonyl complexes is possible by oxidation or reduction of the neutral complexes.