Metallorganische Verbindungen des Iridiums und Rhodiums: XXXI. Heterobimetallische Zweikern-Komplexe durch Addition von Cp(CO) 3 MH (M  Mo, W) an Ir(CH 3)(CO)(PPh 3) 2

Abstract

Treatment of Ir(CH 3)(CO)(PPh 3) 2 with molybdenum or tungsten hydrides Cp(CO) 3MH results in elimination of both CH 4 and CO to give heterobimetallic products of composition Cp(CO) M(μ-CO) 2-I r(PPh 3) 2 ( 1: M  Mo; 2: M  W). Degradation of these complexes in solution occurs by CO transfer and oxidative PC addition, affording the phosphido-bridged derivatives Cp(CO) 2- M(μ-Ph 2P)I r(C 6H 5)(CO) 2(PPh 3) ( 3: M  Mo; 4: M  W) as the ultimately stable compounds. The structures of 1 and 2, determined by X-ray crystallography, comprise Cp (CO) 3M groups attached to the Ir(PPh 3) 2 mioiety by short metal-metal bonds (MoIr 2.579(1), WIr 2.583(1) Å) and two asymmetric CO bridges.