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.