Phosphorus monoxide as a quadruply bridging ligand: syntheses and X-ray crystal structures of Ru5(CO)15(µ4-PF) and [H2NCy2][Ru5(CO)15(µ4-PO)]

Abstract

The reaction of Ru₄(CO)₁₃(µ₃-PNCy₂) 1 with Ru(CO)₅ in refluxing hexane yields Ru₅(CO)₁₅(µ₄-PNCy₂) 2 in high yield; treatment of 2 with HBF₄·Et₂O forms Ru₅(CO)₁₅(µ₄-PF) 3 which is the first cluster complex to contain a µ₄-fluorophosphinidene ligand, while refluxing 2 with HBF₄·H₂O in CH₂Cl₂ yields 3 and the title compound [Ru₅(CO)₁₅(µ₄-PO)][H₂NCy₂] 4, an unprecedented example of a cluster complex containing a µ₄-PO ligand.