800369-75-9Relevant academic research and scientific papers
Reactions of 2-indolylphosphines with Ru3(CO)12: Cluster capping with μ3, η2-indohlyphosphine as an anionic six-electron P,N-donor ligand
Lam, Edmond,Farrar, David H.,Scott Browning,Lough, Alan J.
, p. 3383 - 3388 (2004)
Stepwise bidentate coordination of the novel indolylphosphine ligands HL (1, HL = P(C6H5)2(C9H8N) (diphenyl2-(3-methylindolyl)phosphine); 2, HL = P(C6H 5)(C9H8N)2 (phenyldi-2-(3- methylindolyl)phosphine); and 3, HL = P(C6H5)(C 17H12N2) (di(1H-3-indolyl)methane-(2,12)- phenylphosphine)) to the ruthenium cluster Ru3(CO)12 is demonstrated. Reactions of 1-3 with Ru3(CO)12 led to the formation of Ru3(CO)11(HL) (4-6), in which HL is mono-coordinated through the phosphorus atom. The X-ray structures of 4-6 show that the phosphorus atom is equatorially coordinated to the triruthenium core. In all cases, gentle heating of Ru3(CO)11(HL) resulted in the formation of Ru3(CO)9(μ-H)(μ3, η2-L) (7-9) in which the NH proton of the indolyl substituent had migrated to the ruthenium core to form a bridging hydride ligand. The X-ray structure of Ru3(CO)9(μ-H)[μ3, η2P(C6H5)2(C9H 7N)] (7) shows the deprotonated nitrogen atom of the indolyl moiety bridging over the face of the triruthenium core, bonding to the two ruthenium metal centers to which the phosphorus atom is not bound. The phosphorus atom is forced to adopt an axial bonding mode due to the geometry of the indolylphosphine ligand. Cluster electron counting and X-ray data suggest that the indolylphosphine behaves as a six-electron ligand in this mode of coordination. Compounds 4-9 have been characterized by IR, 1H, 13C and 31P NMR spectroscopy.
