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By reaction of conjuncto-[B 6 H 6 -B 6 H 6 ] 2-  in alkaline solution with excess bromine the heptabromo-closo-heptaborate, [B 7 Br 7 ] 2  is formed. The crystal structure of [(CsH 3 N) 2 CH 2 ][B 7 Br 7 ] has been determined by single crystal X-ray diffraction analysis (monoclinic, space group P2 1 /a with a = 15.0843(14), b = 9.8882(14), c = 17.057(2) Å, β = 114.039°(7)). In accordance with the D 5h  point symmetry, the anion shows two singlets at -23.3 and -0.1 ppm with the intensity ratio 2:5 in its  11 B NMR spectrum.

zeitschrift für naturforschung b

Darstellung und  11 B-NMR-Spektrum von Heptabromo-closo-heptaborat, [B 7 Br 7 ] 2-  sowie Kristallstruktur von [(C 5 H 5 N) 2 CH 2 ][B 7 Br 7 ] / Preparation and  11 B NMR Spectrum of Heptabromo-closo-heptaborate, [B 7 Br 7 ] 2- , and the Crystal Structure of [(C 5 H 5 N) 2 CH 2 ][B 7 Br 7 ]