[Et4N][7-Me2S-nido-B11H12]

Tetraethylammonium 7-dimethylsulfanyl-nido-dodecahydroundecaborate, [Et4N][7-Me2S-nido-B11H12] or C8H20N+.-C2H18B11S-, is a product of the deprotonation of [7-Me(2)SnidoB(11)H(13)] with KHBEt3 and precipitation with tetraethylammonium chloride. The effect of removing one endoterminal H atom is to cause a general contraction of the open-face B-B distances.