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Free keywords:
Zerovalent metal Complexes, Organic ligand, Ditertiary phosphine, Preparation, Dinuclear complex, NMR spectrum, Organic solution, Low temperature, Transition metal Complexes, Nickel Complexes
Abstract:
The reaction of tris(ethene)nickel(0) with stoichiometric amounts of bis(dimethylphosphino)methane (dmpm) in ether at low temperature affords the yellow crystalline, dinuclear complexes (dmpm)Ni2(CH4)4 (1) and (dmpm)2Ni2(C2H4)2 (2). 2 reacts with ethyne to yield
(dmpm)2Ni2(C2H2)2 (3). When 2 is treated with CO at —40 °C the primary product is (dmpm)2Ni2(CO)2(µ-CO) (4). At 20 °C 4 is converted by additional CO into (dmpm)2Ni2(CO)4 (5), which has already been characterized as the reaction product of Ni(CO)4 with dmpm. In compounds 1—5 the bidentate dmpm acts as a bridging and not as a chelating ligand. The structures of complexes 1—4 were assigned on the basis of their 13C and 31P NMR spectra.
