NIOBIUM(III) COMPLEXES CONTAINING ACETYLENE, ISOCYANIDE, PHOSPHINE OR PHOSPHITE LIGANDS

Article abstract of DOI:10.1016/S0022-328X(00)98828-4

The reduction of THF solutions of (η-C5H5)2NbCl2 with Na/Hg in the presence of various phosphines, phosphites, acetylenes or isocyanides gives complexes of the type (η-C5H5)2NbClL, where L = PMe2Ph, P(OMe)3, PhC<*>CPh, PhC<*>CH, HC<*>CH, CNPh, or CNCy.A complex is also formed in solution from PEt3 but cannot be isolated as a solid.For L = P(OPh)3 no stable compound can be obtained.The IR, 1H and 13C NMR spectra of the complexes are described.