Reactions of Some Niobium(V) and Tantalum(V) Halides with Pyridine
1962; American Chemical Society; Linguagem: Inglês
10.1021/ba-1963-0037.ch018
ISSN0065-2393
AutoresRobert E. McCarley, Benjamin Glenn Hughes, James Claude Boatman, Bruce Alan Torp,
Tópico(s)Mass Spectrometry Techniques and Applications
ResumoThe reaction of pyridine with NbBr5 proceeded by oxidation-reduction to yield the niobium(IV) derivative NbBr4(C5H5N)2, and the oxidation products 1-(4-pyridyl) pyridinium bromide (I) and pyridinium bromide. I was identified by comparison of the ultraviolet spectra in acidic and basic solutions with those of its known salts. Reduction of NbCI5 by pyridine was also observed but a different reaction stoichiometry was obtained. The reactions of TaCI5 and TaBr5 with pyridine afforded only the adducts TaCI5(C5H5N) and TaBr5(C5H5N). In contrast to the behavior of NbCI5 and NbBr5, both Nbl5 and Tal5 dissociated in pyridine to give the adducts MI4(C5H5N)2, and the pyridine adduct of elemental iodine.
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