closo-Halogenohydrohexaborate, II 11B-NMR-Spektren der closo-Halogenohydrohexaborate XnB6H6-n 2-, n = 0-6; X = Cl, Br, I / closo-Halogenohydrohexaborate, II 11B NMR Spectra of the closo-Halogenohydrohexaborates XnB6H6-n 2-, n = 0-6; X = Cl, Br, I
Open Access
- 1 March 1987
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 42 (3) , 287-292
- https://doi.org/10.1515/znb-1987-0307
Abstract
The point symmetries of the halogenohydrohexaborates within the nearly complete series XnB6H6-n 2-, X = Cl, Br, I; n = 1-5, are determined from the 11B and 11B{1H} NMR spectra, which show characteristic features for homologous isostructural compounds related to the electronegativity of the substituents. The chemical shifts are mainly influenced by -I, +M, and in the case of X = I by the heavy atom effect. Along with a strong antipodal effect a slight vicinal influence between neighbours in the B6 cage is observed, increasing with the number of substituted atomsKeywords
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