PREPARATION, B-11 NMR AND VIBRATIONAL-SPE CTRA OF AMINOHEXAHYDRO-CLOSO-HEXABORATE(1-), [B6H6(NH2)](-), AND THE CRYSTAL-STRUCTURE OF CS[B6H6(NH2)]CENTER-DOT-H2O

By reduction of [B6H5(NO2)](2-) With Fe2+ in aqueous alkaline solution [B6H6(NH2)](-) is formed. The compound has been separated by extracti on with dichloromethane in the presence of tetrabutylammoniumbromid an d precipitated from the organic phase by adding CsCH3COO/C2H5OH. The C rystal structure of Cs[B6H6(NH2)].H2O has been determined by single cr ystal X-ray diffraction analysis, monoclinic space group C2 with a = 2 2.1075(14), b = 6.491(2), c = 5.9570(4) Angstrom, beta = 100.168(6)deg rees. The B-11 NMR spectrum is consistent with a mono-hetero-substitut ed octahedral B-6 cage with local C-4v symmetry. The IR and Raman spec tra exhibit characteristic N-H, B-H and B-6 vibrations.