SYNTHESIS OF RE-RU HETEROBIMETALLIC POLYHYDRIDE COMPLEXES - STUDY OF THE INFLUENCE OF LIGANDS BONDED TO THE MONOMETALLIC PRECURSORS ON THE NATURE OF THE ISOLATED BINUCLEAR COMPLEXES

The reaction of K[H(6)ReL(2)] with [RuHCl(CO)(PPh(3))(3-x){P(OPri}3)(x )](L(2) = (PMePh(2))(2), dppe,(AsPh(3))(2), or (PPh(3))(2); x = 0, 1 o r 2) leads to (CO)HRe(mu-H)(3)RuH(PPh(3))(2-y){P(OPri)(3)}(y)](x = 0 o r 1, y = 0; x = 2, y = 1(L(2) = PPh(3))) in a first step. Under the re action conditions most of these complexes react rapidly with the liber ated phosphine giving (2)(CO)Re(mu-H)(3)Ru(PPh(3))(3-y)-{P(OPri)(3))(y )] (L(2) = (PMePh(2))(2) or dppe, y = 0; L(2) = (PPh(3))(2) y = 1) as the only isolable complexes. The structure of [(PMePh(2))(2)(Co)Re(mu- H)(3)Ru(PPh(3))(3)] has been established by X-ray structure analysis. The complex Ph(3))(2)(CO)Re(mu-H)(3)Ru(PPh(3))(2)(P(OPri)(3))] reacts with molecular hydrogen under pressure to generate [L(2)(CO)HRe(mu-H)( 3)RuH)PPh(3))(P(OPri)(3)) as the sole product.