Hydrazine derivatives of ring-substituted tetracarbonyl-h5-cyclopentadienylvanadium complexes

Add time:07/30/2019    Source:sciencedirect.com

The complexes h5-Cp′V(CO)3(hydrazine′) (Cp′ = C5H5, C5Me5, 1,2- and 1,3-C5H3(Me)cetyl, C5H4SiMe3, and indenyl; hydrazine′ = N2H4, N2H3Me, H2NMe2, H(Me)NN(Me)H, and N2H3Ph), containing the hydrazine ligand in the mono-hapto mode, have been prepared via the precursors Cp′V(CO)3(thf) and characterized by their IR, 1H, and 51V NMR spectra. The V-hydrazine′ moiety is rigid on the NMR time scale. Coordination of the NH2 group is preferred, but for Cp′ = C5H4SiMe3 and C5H3(Me)cetyl, and hydrazine′ = H2NNHPh, the ligand bonds to about equal extents through NH2 and NHPh. δ(51V) values, typically between −620 and −690 ppm (relative to VOCl3) lie between those for amine and nitrile derivatives, reflecting the intermediate basicity of the hydrazines.

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