Notes. Synthesis and crystal structure of tris[bis(trimethylsilyl)amido]oxoniobium(V): a four-co-ordinated oxo niobium precursor
- 1 January 1988
- journal article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 2,p. 533-535
- https://doi.org/10.1039/dt9880000533
Abstract
The reaction between [NbCl4(thf)2](thf = tetrahydrofuran) and LiN(SiMe3)2 affords, by oxygen abstraction of the thf ligand, the first non-chlorine oxoamido derivative of niobium, [NbO{N(SiMe3)2}3], (1). This novel compound could also be obtained directly from (NbOCl3)n, although in poor yield. Its monomeric nature was confirmed by X-ray analysis. The crystals are monoclinic, space group P21/n, with a= 12.352(12), b= 18.107(3), c= 15.036(14)Å, β= 101.83(5)°, and Z= 4. The structure was solved and refined on the basis of 4 585 significant counter data to a final R of 0.034. The steric hindrance of the bis(trimethylsilyl) amido ligand stabilizes a low co-ordination number, with a terminal NbO bond. Compound (1) also represents the first authentic four-co-ordinate niobium compound structurally characterized.Keywords
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