Syntheses and characterization of high-nuclearity osmium–palladium mixed-metal carbonyl clusters; molecular structures of [Os4Pd6(CO)8(µ-CO)5(µ3-CO)3(µ-dppm)2]·0.5C6H14 and [Os5Pd4(µ6-C)(CO)12(µ-CO)3(µ-dppm)2]·CH2Cl2

Abstract

Treatment of [Os₃(CO)₁₀(µ-H)₂] with [Pd₂(µ-dppm)₂Cl₂] afforded the novel high-nuclearity osmium–palladium mixed-metal carbonyl clusters [Os₅Pd₆(CO)₁₃(µ-CO)₅(µ-H)₂(µ-dppm)₂] 1, [Os₅Pd₆(CO)₁₃(µ-CO)₆(µ-dppm)₂] 2 and [Os₄Pd₆(CO)₈(µ-CO)₈(µ-dppm)₂] 3 in low yield, while the reaction of [Os₅(µ₅-C)(CO)₁₅] with [Pd₂(µ-dppm)₂Cl₂] afforded [Os₅Pd₄(µ₆-C)(CO)₁₂(µ-CO)₃(µ-dppm)₂] 4 and [Os₅(µ₅-C)(CO)₁₃(µ-dppm)] 5 in moderate yields. The molecular structures of clusters 3 and 4 have been determined.