Darstellung,¹¹B-NMR- und Schwingungsspektren isomerenreiner Halogenohydrodecaborate X_nB₁₀H_{10- n} ^2-; X = Cl, Br, I; n = 1, 2 / Preparation, ¹¹B NMR and Vibrational Spectra of Pure Isomeric Halohydrodecaborates X_nB₁₀H_{10- n} ^2-; X = Cl, Br, I; n = 1, 2

Open Access

1 January 1984

journal article
Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B

Vol. 39 (1) , 6-13
https://doi.org/10.1515/znb-1984-0103

Abstract

Pure isomers of X_nB₁₀H_10-n ^2-; X = Cl, Br, I; n = 1, 2; are isolated by ion exchange chromatography on diethylaminoethylcellulose. Their structures are determined by¹¹B and ¹¹B {¹H }NMR spectroscopy. There are characteristic chemical shifts due to apical and equatorial substituents, respectively. The highest field signals are explained by the antipodal effect. In contrast to theoretical predictions the experimental investigations show, that the successive electrophilic substitution preferably occurs on equatorial and not on apical B atoms. IR and Ram an spectra of the 2-XB₁₀H₉ ^2-species are very similar in the ν(BH) and in the B^10-cage absorption region. In the far infrared there are two characteristic bands, shifting to lower frequencies in the series Cl, Br, I, which are therefore assigned to (B₁₀) - X stretching and (B₁₀) - X deformation modes.

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Darstellung,11B-NMR- und Schwingungsspektren isomerenreiner Halogenohydrodecaborate XnB10H10- n 2-; X = Cl, Br, I; n = 1, 2 / Preparation, 11B NMR and Vibrational Spectra of Pure Isomeric Halohydrodecaborates XnB10H10- n 2-; X = Cl, Br, I; n = 1, 2

Abstract

Keywords

Darstellung,¹¹B-NMR- und Schwingungsspektren isomerenreiner Halogenohydrodecaborate X_nB₁₀H_{10- n} ^2-; X = Cl, Br, I; n = 1, 2 / Preparation, ¹¹B NMR and Vibrational Spectra of Pure Isomeric Halohydrodecaborates X_nB₁₀H_{10- n} ^2-; X = Cl, Br, I; n = 1, 2