229494-50-2Relevant academic research and scientific papers
The Reagent [K(18-crown-6)][RuH(PPh3)2(η(5)-7,8-C2B9H11)] as a Precursor to New Ruthenacarborane Complexes
Ellis, Dianne D.,Couchman, Samantha M.,Jeffery, John C.,Malget, John M.,Stone, F. Gordon A.
, p. 2981 - 2988 (2008/10/08)
In ethanol the charge-compensated molecule exo-nido-ruthenacarborane [5,6,10-{RuCl(PPh3)2}-5,6,10-μ-(H)3-10-H-7,8-C2B9H8] reacts with KOH to afford the anionic closo-complex [RuH(PPh3)2(η(5)-7,8-C2B9H11)](-) isolated as its K(+) (2a) or [K(18-crown-6)](+) (2b) salt. Treatment of 2a with CO gives [Ru(CO)(PPh3)2(η(5)-7,8-C2B9H11)] (3a) in high yield; its structure was determined by X-ray crystallography. In contrast 2b reacts with CO to yield the salt [K(18-crown-6)][RuH(CO)(PPh3)(η(5)-7,8-C2B9H11)] (2d). Reaction of 2b with [RuCl2(PPh3)3] affords [Ru2(μ-H)(H)(PPh3)4(η(5)-7,8-C2B9H11)] (5), which with CO produces [Ru2(μ-H)(μ-σ:η(5)-7,8-C2B9H10)(CO)4(PPh3)2] (6), the structureof which was established by X-ray diffraction. The molecule has a metal -metal bond bridged on one side by a hydrido ligand and on the other by a nido-7,8-C2B9H10 fragment. The latter is η(5)-coordinated to a ruthenium atom ligated by a PPh3 and a CO ligand and is also σ-bondedto the second ruthenium which carries three CO molecules and a PPh3 gro up. The σ bond utilizes a boron lying in an α site with respect to the carbons in the CCBBB ring coordinated to the Ru(CO)(PPh3) moiety. Reactions between 2b or 2d and [CuCl(PPh3)3] and [AuCl(PPh3)], respectively, afford the bimetal complexes [RuM(μ-H)(L)(PPh3)2(η(5)-7,8-C2B9H11)] [M = Cu, L = PPh3 (7a), L = CO (7b); M = Au, L = PPh3 (8a),L = CO (8b)]. X-ray diffraction studies are reported for 7a and 8a, rev ealing in the case of the former a structure in which an exopolyhedral B-H-Cu bond supplements the Ru(μ-H)Cu interaction.
