Synthesis and X-ray crystal structures of phosphido-bridge heterobimetallic complexes: [FeIr(μ-CO)(CO) 4(μ-P tBu 2)( tBu 2PH)] and [CoIr(CO) 5(μ-H)(μ-P tBu 2)( tBu 2PH)

Abstract

From the reaction of [IrCl( tBu 2PH) 3] ( 1) with [Fe(CO) 5] in refluxing toluene, the heterobimetallic complex [FeIr(μ-CO)(CO) 4(μ-P tBu 2( tBu 2PH)] ( 2) is obtained. The X-ray structure investigations of 2 show that the FeIr bond is bridged by a carbonyl group; usually in this special type of complex only a semi-bridging carbonyl ligand bound to the electronically saturated metal center is present. The reaction of [IrCl( tBu 2PH) 3]/AgPf 6 with K[Co(CO) 4] in acetone at room temperature results in numerous products. From this reaction of phosphido-bridged heterobimetallic system [CoIr(CO) 5(μ-H)(μ-P tBu 2) tBu 2PH)] ( 3) has been isolated. The molecular structures of 2 and 3 were determined by single-crystal X-ray studies: 2 crystallizes in the space group Pbca with eight molecules in the unit cell, 3 crystallizes in the space group P2 1/ n with four molecules per unit cell.