摘要:
The dipalladium complexes, [PdCl(mu-MeN{P(OR)(2)}(2))](2) (R = CH2CF3, 1a; Ph, 1b) react with [Mo-2(eta(5)-C2H5)(2)(CO)(6)] in boiling benzene to afford the molybdenum-palladium heterometallic complexes, [(eta(5)-C5H5)(CO)Mo(mu-MeN{P(OR)(2)}(2))(2)PdCl] (R = CH2CF3, 3a- Ph, 3b), [(eta(5)-C5H5)Mo(mu(3)-CO)(2)(mu-MeN{P(OR)(2)}2)2Pd(2)Cl], (R = CH2CF3, 5a,- Ph, 5b) [(eta(5)-C5H5)(Cl)Mo(mu(2)-CO)(mu(2)-Cl)(mu-MeN{P(OR)(2) }(2))PdCl], (R=CH2CF3, 6a; Ph, 6b) and also the mononuclear complex [Mo(CO)Cl(eta(5)-C5H5)(kappa(2)- MeN{P(OR)(2)}(2)], (R = Ph, 4b). These complexes have been separated by column chromatography and are characterised by elemental analysis, IR, H-1, P-31{H-1} NMR data. The structures of 1a, 3a, 4b, 5b and 6a have been confirmed by single crystal X-ray diffraction. The CO ligands in 5b and 6a adopt a semi-bridging mode of bonding; the Mo-CO distances (1.95-1.97 Angstrom) are shorter than the Pd-CO distances (2.40-2.48 Angstrom). The Pd-Mo distances fall in the range. 2.63-2.86 Angstrom. The reaction of [Mo-2(eta(5)- C5H5)(2)(CO)(6)] with MeN{P(OPh)(2)}(2) in toluene gives [Mo-2(CO)(4)(eta(5)-C5H5)(2)(kappa(1)-MeN{P(OPh)(2)}(2))(2)] (2) in which the diphosphazane acts as a monodentate ligand. (C) 2004 Elsevier B.V. All rights reserved.