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Adducts of Niobium(V) and Tantalum(V) Halogenides. IX. Relative stability of the adducts of the chlorides and bromides with some dialkylchalcogenides

✍ Scribed by René Good; André E. Merbach

Publisher
John Wiley and Sons
Year
1974
Tongue
German
Weight
364 KB
Volume
57
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The relative stability of adducts formed by Nb(V) and Ta(V) pentachlorides and bromides with some dimethylchalcogenides and nitriles has been determined by ^1^H‐NMR. in dichloromethane at − 60°. The stabilities are explained in terms of the HSAB principle and Jørgensen's symbiotic effect. A good correlation exists between the ionisation potential of the valence p orbital of the chalcogen atom in the ligand and the logarithm of the relative stability of the adduct formed with a given acid.

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Adducts of niobium(V) and tantalum(V) ha
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## Abstract The adducts of niobium(V) and tantalum(V) halides with some phosphoryl compounds have been studied in chloroform solution by ^1^H‐ and ^19^F‐FT‐NMR. spectroscopy. These octahedral adducts of general formula MX~5~ · L (M = Nb, Ta; X = F, Cl, Br; L = phosphoryl ligand) are monomeric and n

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