Reaction of the unsaturated triosmium clusters [Os3H(CO)8{Ph2PCH2P(Ph)C6H4}] and [Os3H(CO)8{Ph2PC(CH2)P(Ph)C6H4}] with phosphines and phosphites; crystal structures of [Os3H(CO)8{Ph2PCH2P(Ph)C6H4}(PPri3)], [Os3(CO)8(Ph2PCH2PPh2){P(OMe)3}2], and [Os3(CO)8(Ph2PCH2PPh2)(PPh3)2]

Abstract

Treatment of the unsaturated clusters [Os₃(µ-H)(CO)₈{µ-Ph₂PCH₂P(Ph)C₆H₄}]1a and [Os₃(µ-H)(CO)₈{µ-Ph₂PC(CH₂)P(Ph)C₆H₄}]1b with two-electron donor ligands gave the saturated clusters [Os₃(µ-H)(CO)₈{µ-Ph₂PCH₂P(Ph)C₆H₄}L][L = CO 2a or PR₃ or P(OR)₃3(R = Me, Et, Prⁱ, Bu or Ph)], [Os₃(µ-H)(CO)₈{µ-Ph₂PC(CH₂)P(Ph)C₆H₄}L](L = CO 2b) and [Os₃(CO)₈(dppm)L₂]4[dppm = Ph₂PCH₂PPh₂; L = CO, PR₃ or P(OR)₃]. Two different isomers of complex 4 are observed depending on the ligand L. All the products have been characterised by IR and NMR spectroscopy. The structures of [Os₃H(CO)₈{Ph₂PCH₂P(Ph)C₆H₄}(PPrⁱ₃)]3a, [Os₃(CO)₈(dppm){P(OMe)₃}₂]4a and [Os₃(CO)₈(dppm)(PPh₃)₂]4c have also been established by X-ray crystallography.