Abstract
I.r. and n.m.r. spectra have been measured on solutions of a number of dialkylamido-compounds M(NR2)x of titanium, vanadium, zirconium, niobium, hafnium, tantalum, and thorium and on the alkylimido-trisdialkylamidotantalums RNTa(NR2)3. Assignments of characteristic bands are made and the metal–nitrogen stretching frequencies are discussed in terms of a significant contribution of nitrogen → metal pπ–dπ bonding. The variable temperature n.m.r. studies on Zr(NMe2)4 confirmed the presence of polymeric species in solution.
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