Darstellung, ~(11)B-NMR- und Schwingungsspektren von cis-Monoethylmononitrotetrahydro-closo-hexaborat (2-) sowie Kristallstruktur von cis-(Ph_4As)_2(B_6H_4(C_2H_5)(NO_2))

摘要

By electrochemical oxidation of (n-Bu_4N)[B_6H_5H~(fac)(C_2H_5)] in the presence of nitrite ions and of the base DBU in dichloromethane solution cis-[B_6H_4(C_2H_5)(NO_2)]~(2-) is formed. X-ray diffraction analysis has been performed on a single crystal of cis-(Ph_4As)_2[B_6H_4(C_2H_5)(NO_2)] (triclinic, space group P1; a = 10.673 (4), b = 10.907 (4), c = 21.237 (4) A, #alpha# = 80.789 (4), #beta# = 83.117 (4), #gamma# = 66.548 (2) deg, Z = 2). The ~(11)B NMR spectrum is consistent with a disubstituted octahedral B_6 cage with local C_8 symmetry. The IR and Raman spectra exhibit characteristic CH_3, CH_2, NO_2, BN, BH and B_6 vibrations.