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

✍ Scribed by Willi Keller; Wolfgang Haubold; Bernd Wrackmeyer

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
90 KB
Volume
37
Category
Article
ISSN
0749-1581

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✦ Synopsis

The linewidths of 10 B NMR signals of tetrachlorotetraborane (1), measured at various temperatures, indicate that there are weak scalar 11 B-10 B interactions. Selective homonuclear 11 Bf 11 Bg decoupling experiments confirmed previous signal assignments and improved the resolution of 11 B NMR spectra (by simplifying the complex spin systems) of closo-diheteroboranes 1,2-P 2 B 4 Cl 4 (2), 1,2-P 2 B 4 Br 4 (3) and 1,2-AsPB 4 Cl 4 (4) and the icosahedral closo-diheteroboranes 1,7-P 2 B 10 Cl 10 ( 6) and 1,7-P 2 B 10 Br 10 (7). This allowed the determination of coupling constants 1 J 31 P, 11 B of the order of 27-39 Hz, significantly smaller than for known non-halogenated parent compounds. The 11 B and 31 P NMR spectra of 2, measured at 60 °C, allowed the determination of 1 J 31 P, 31 B D 100 š 3 Hz by simulation.

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