REACTIONS OF [IRCL(BU-2(T)PH)(3)] WITH [M-3(CO)(12)](M=FE,RU) - SYNTHESIS AND X-RAY CRYSTAL-STRUCTURES OF THE METAL-CLUSTERS [RU-3(CO)(8)(MU-H)(2)(MU(3)-PBUT)(BU-2(T)PH)] AND CO)(7)(MU-H)(2)(MU-PBU2T)(2)(BU-2(T)PH)(MU(3)-CL)]

The reactions of [IrCl((Bu2PH)-P-t)(3)] (1) with the metal carbonyls [ M-3(CO)(12)] (M = Fe, Ru) in refluxing toluene have been investigated. By using [Ru-3(CO)(12)] the metal cluster [Ru-3(CO)(8)(mu-H)(2)(mu(3) -PBut)((Bu2PH)-P-t)] (2) and the butterfly configured heterometallic c luster )(7)(mu-H)(2)(mu-PBu2t)(2)((Bu2PH)-P-t)(mu(3)-Cl)] (3) were obt ained. On the contrary, the reaction of 1 with [Fe-3(CO)(12)] leads un der cluster degradation beside the mononuclear complex [Fe(CO)(4)((Bu2 PH)-P-t)] (5) to the known compound [FeIr(mu-CO)(CO)(4)(mu-PBu2t)((Bu2 PH)-P-t)] (4) in good yields. The molecular structures of 2 and 3 have been determined by single crystal X-ray studies.