Indirect nuclear spin-spin coupling in tetrachlorotetraborane(4) and halogenated polyhedral phospha- and arsaboranes

Publication Type: Journal contribution
Authors: Keller, W.; Haubold, W.; Wrackmeyer, B.
Year of publication: 1999
Published in: Magn. Reson. Chem.
Band/Volume: 37/8
DOI: 10.1002/(SICI)1097-458X(199908)37:8<545::AID-MR
Page (from - to): 545-550

Abstract

The linewidths of 10B NMR signals of tetrachlorotetraborane (1), measured at various temps., indicate that there are weak scalar 11B-10B interactions. Selective homonuclear 11B11B decoupling expts. confirmed previous signal assignments and improved the resoln. of 11B NMR spectra (by simplifying the complex spin systems) of closo-diheteroboranes 1,2-P2B4Cl4 (2), 1,2-P2B4Br4 (3) and 1,2-AsPB4Cl4 (4) and the icosahedral closo-diheteroboranes 1,7-P2B10Cl10 (6) and 1,7-P2B10Br10 (7). This allowed the detn. of coupling consts. 1J(31P, 11B) of the order of 27-39 Hz, significantly smaller than for known nonhalogenated parent compds. The 11B and 31P NMR spectra of 2, measured at 60.degree., allowed the detn. of 1J(31P, 31B) = -100 .+-. 3 Hz by simulation.

Involved persons

Dr. rer. nat. Willi Keller

Involved institutions

Institute of Chemistry