REACTIONS OF TETRAKIS(TRIFLUOROMETHYL)DIPHOSPHINE AND BIS(TRIFLUOROMETHYL)PHOSPHINE WITH RUTHENIUM CARBONYL CLUSTERS - X-RAY STRUCTURE OF TETRARUTHENIUM CARBONYL CLUSTER DERIVATIVES

Reaction of [Ru-3(CO)(12)] with (CF3)(2)P-P(CF3)(2) in p-xylene at 140 degrees C yielded the compounds [Ru-4(CO)(13){mu-P(CF3)(2)}(2)] (1), [Ru-4(CO)(14){mu-P(CF3)(2)}(2)] (2) and [Ru-4(CO)(11){mu-P(CF3)(2)}(2) ] (3). Reaction with [(mu-H)(4)Ru-4(CO)(12)] under similar conditions yielded [(mu-H)(3)Ru-4(CO)(12){mu-P(CF3)(2)}] (4). All four compounds have been characterised by X-ray crystallography. The fluxional behavi our of the hydrides in 4 has also been studied by variable-temperature NMR spectroscopy. Compounds 1, 2 and 4 were also obtained from the re actions of [Ru-3(CO)(12)] with (CF3)(2)PH in dichloromethane at 80 deg rees C.