2,2′-Bipyridyl complexes of the niobium(V) and tantalum(V) halides

1 January 1969

journal article
research article
Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A

p. 1546-1549
https://doi.org/10.1039/j19690001546

Abstract

Methyl cyanide solutions of the pentahalides NbCl₅, TaCl₅, and TaBr₅ react with 2,2′-bipyridyl (bipy) at ca. 0° to yield compounds of general formula MX₅ bipy (MeCN). These are believed to be seven-co-ordinate and to contain a molecule of ‘lattice’ methyl cyanide. Under similar reactions conditions niobium(V) bromide and tantalum(V) iodide react to give MX₅bipy₂; no pure product was isolated from the related reaction involving niobium(V) iodide. At room temperature direct reaction of niobium(V) and tantalum(V) iodide with methyl cyanide leads to the formation of 1 : 1 adducts Ml₅,MeCN. Compounds were characterised by their electronic and vibrational (i.r. and Raman) spectra.

Keywords

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