Binding modes of a mixed donor multidentate iminobisphosphane ligand to the triosmium cluster: the crystal structures of [{Os 3(CO) 11} 2(PNCHP)], [Os 3(μ-H)(μ 3-PNCP)(CO) 7] and [Os 3(μ-H)(μ 2-PNCP)(CO) 8]

• Published in: Journal of organometallic chemistry 2000-09, Vol.609 (1), p.2-9
• Main Authors: Ainscough, Eric W, Brodie, Andrew M, Burrell, Anthony K, Kennedy, Steven M.F
• Format: Article
• Language: English
• Subjects: Crystal structure; Iminophosphane; Osmium cluster
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/S0022-328X(00)00348-X

The triosmium clusters [Os 3(CO) 11(CH 3CN)] and [Os 3(CO) 10(CH 3CN) 2] react with 2-(diphenylphosphino)- N-[2-(diphenylphosphino)benzylidene]benzeneamine (PNCHP) to give [{Os 3(CO) 11} 2(PNCHP)] ( 1), two coordination isomers of [Os 3(CO) 11(PNCHP)] ( 2a) and ( 2b), and 1,1-[Os 3(CO) 10(PNCHP)] ( 3), respectively. When ( 3) is reacted with trimethylamineoxide the major product is [Os 3(μ-H)(CO) 7(μ 3-PNCP)] ( 4) with two geometrical isomers of [Os 3(μ-H)(CO) 8(μ 2-PNCP)] ( 5a) and ( 5b) being minor products. The clusters have been fully characterised by spectroscopic means and the structures of 1·CH 2Cl 2, 4·1.5CH 2Cl 2 and 5a established by single-crystal X-ray analyses. In 1 PNCHP bridges two osmium triangles equatorially. In 4 the imine hydrogen of PNCHP has migrated to the osmium cluster and PNCP acts as a triply bridging nine electron donor, while in 5a PNCP acts as a doubly bridging seven electron donor ligand.