Preparation and characterization of some stereochemically rigid seven-coordinate η-cyclopentadienyltris(N,N-dialkyldithiocarbamato)hafnium(IV) complexes |
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Authors: | Rajinder K. Tuli Purshotam Soni Kailash Chandra Rajendra K. Sharma Bhagawan S. Garg |
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Affiliation: | (1) Department of Chemistry, University of Delhi, 1 10007 Delhi, India |
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Abstract: | Summary N,N-Dialkyldithiocarbametohafnium(IV) complexes of the type -CpHf(S2CNR2)3, (R = Me or Et) have been prepared in nonaqueous media by reacting dichlorodicyclopentadienylhafnium(IV) with sodium salts of substituted dithiocarbamic acids. Conductance and i.r. studies show that these complexes are nonelectrolytes in which all of the dithiocarbamate ligands are bidentate. A coordination number of seven may be assigned to hafnium(IV) in these complexes, 'H n.m.r. spectra of the complexes in CDCI3 at ambient temperature (30°) indicate that the metal centered rearrangement and the S2C N bond rotation are both slow on the n.m.r. time scale. A capped octahedron configuration is suggested for these complexes.Author to whore all correspondence should be addressed. |
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