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Adducts of niobium(V) and tantalum(V) halides. XIV. Structure and relative stability of the adducts with some phosphoryl compounds

✍ Scribed by Christian M. P. Favez; Henri Rollier; André E. Merbach

Publisher
John Wiley and Sons
Year
1976
Tongue
German
Weight
461 KB
Volume
59
Category
Article
ISSN
0018-019X

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✦ Synopsis

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 neutral. Their relative stability constants have been determined at −60°. The stabilities are controlled by electronic effects of substituents on the phosphoryl group.

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Adducts of Niobium (V) and Tantalum (V)
Adducts of Niobium (V) and Tantalum (V) Halides. XV. Ligand Exchange of the Adducts with Some Phosphoryl Compounds
✍ Christian M. P. Favez; André E. Merbach 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 German ⚖ 414 KB

The ligand exchange MX5 . L + \*L 8 MX, . \*L + L for the octahedral adducts MX, . L, in an inert solvent (CH2CI2 or CHCI,) with neutral ligands, proceeds via a dissociative D mechanism when M = Nb, X = C1 and L= phosphoryl compound. A dissociative interchange Id mechanism is suggested when M = N b

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✍ René Good; André E. Merbach 📂 Article 📅 1974 🏛 John Wiley and Sons 🌐 German ⚖ 364 KB

## 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 e