Abstract
The reactions, in sealed tubes, of 8-quinolinol (oxH) with niobium or tantalum pentachlorides or pentabromides (MX5) produce materials of composition MX5,n(oxH)(n= 2, 4, 5, 6, 8, or 10). These materials are mixtures which on heating yield compounds of the type MXm(ox)5–m(m= 1–3). Compounds MX4(ox) have also been prepared, affording all combinations of M, X, and m[except for NbBr2(ox)3]. NbBr(ox)4 and TaBr(ox)4 are 1:1 electrolytes, but conductance measurements and i.r. spectroscopy (4000–80 cm.–1) indicate that the other compounds are nonelectrolytes with metal co-ordination numbers of 9, 8, 7, and 6 for m= 1–4.
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