摘要:
Three nickel-carbonyl-dppm complexes, Ni(CO)2(eta1-dppm)2, Ni2(mu-dppm)2(mu-CO)(CO)2 and Ni2(mu-dppM)2(CO)4 have been prepared by minor modifications of a single synthetic procedure. The complexes were characterized in the solid state by IR analysis and in solution by P-31 NMR analysis. In solution, at 25-degrees-C, Ni(CO)2(eta1-dppm)2 rearranges to initially form Ni2(mu-dppm)2(mu-CO)(CO)2, CO and dppm followed by the subsequent reaction of Ni2(mu-dppm)2(mu-CO)(CO)2 With CO to yield Ni2(mu-dppm)2(CO)4. Carbon monoxide gas uptake measurements were conducted to determine the extents of the interconversions of the three nickel-carbonyl-dppm complexes at 25-degrees-C and 700 torr. Reaction of CO with Ni(CO)2(eta1-dppm)2 yielded a fourth zerovalent complex, Ni(CO)3(eta1-dppm).