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By electrochemical oxidation of (n-Bu 4 N) 2 [B 9 H 9 ] in the presence of nitrite ions and the base DBU in dichloromethane solution [1-(NO 2 )B 9 H 8 ] 2-  is formed. X-ray diffraction analysis has been performed on a single crystal of (Ph 4 P) 2 [1-(NO 2 )B 9 H 8 ] · CH 3 CN (monoclinic, space group P2 1  a = 10.643(5), b = 32.661(5), c = 13.924(5) Å, β = 96.68°, Z = 4). By reduction of [1-(NO 2 )B 9 H 8 ] 2-  with FeSO 4  in aqueous alkaline solution the amino derivative [1-(NH 2 )B 9 H8] 2-  is formed. The UB NMR spectra of both compounds are consistent with a monosubstituted tricapped trigonal prism. The IR and Raman spectra exhibit characteristic BB, BH, NO and NH vibrations, respectively.

zeitschrift für naturforschung b

Darstellung,  11 -NMR- und Schwingungsspektren von Mononitrooctahydrocloso- nonaborat(2-) und Monoaminooctahydro-closo-nonaborat(2-) sowie Kristallstruktur von (Ph 4 P) 2 [1-(NO 2 )B 9 H 8 ]*CH 3 CN / Synthesis,  11 B NMR and Vibrational Spectra of Mononitrooctahydro-closo-nonaborate( 2-) and M onoam inooctahydro-closo-nonaborate(2-) and Crystal Structure of (Ph 4 P) 2 [1-(NO 2 )B 9 H 8 ]*CH 3 CN