Abstract
A serie of seven-coordinate tantalum(I) and niobium(I) complexes of the form [M(CNR)(CO)(dmpe) 2 Cl] [M=Nb, R=Me, Cy, Bu t ; M=Ta, R=Me, Et, Bu t ; dmpe=1,2-bis(dimethylphosphino)ethane] has been synthesized by photolysis of [M(CO) 2 (dmpe) 2 Cl] in the presence of CNR. The bis(isocyanide)complex [Ta(CNMe) 2 (dmpe) 2 Cl] was prepared by reduction of [TaCl 4 (dmpe) 2 ] in the presence of CNMe.
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