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  • "Niobium and Tantalum Complexes" x
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(Dihapto) Ligands 351 Vanadium, Niobium, Tantalum Irradiation of (r/5-C5H5)V(CO)4 with disubstituted acetylenes yields the complex (f/5-C5H5)V(CO)2(RC^CR). Since a single acetylene replaces two carbon monoxide ligands, both π-systems of the acetylene must participate in bonding, and the ligand is thus a four-electron donor. In the complex (f75-C5H5)2V(CF3C=CCF3) the acetylene ligand acts as a two-electron donor. Niobium and tantalum complexes of diphenylacetylene are implicated as inter- mediates in the formation of cyclo butadiene complexes (Chapter 13