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The structure of the title compound, C, ^jgBjgCoNO was solved using X-ray diffraction techniques. The crystals are orthorhombic, space group Pna2i with a = 12.508(7), b = 15.935(2), c = 12.618(2) A, Ζ = 4. The structure has been determined by the heavy-atom method and refined by the full-matrix least-squares method up to R = 0.066 for 1621 counter reflections. The ionic structure consists of the [N(C 2 H5)3CH 3 ] + cation and the [O(C 2 B 9 H 10 ) 2 Co]-anion. The anion is built from two dicarbollide ligands sharing the cobalt atom as a common apex. Moreover, these two ligands are linked by a monoatomic oxygen bridge. The pentagonal planes bound to the cobalt atom are not parallel in the anion, but inclined to each other by an angle of 28.3°, which is caused by the oxygen bridge.

The structure of C2B10H11.CH2C27H45O was determined by X-ray diffraction. This compound crystallizes in the orthorhombic system with the P212121 space group. The unit cell parameters are a = 994.0(4), b = 3 231.0(7), c = 1 039.6(2) pm, V = 3 338 . 106 pm3, Z = 4, calculated density Dc = 1.080Mg m-3. Mr = 542.9, linear absorption coefficient μ(MoK α) = 0.54 cm-1 F(000) = 1 184. Intensities were measured at room temperature, radiation used λ(MoK α) = 71.073 pm. Final R = 0.063 for 2 099 observed independent reflections. The studied molecule is built from ortho-carborane icosahedron connected with the cholesterol through the methylene CH2 group bonded to the icosahedral carbon atom C(B1) (C-C= 151.0(7) pm) and to the oxygen atom of the cholesterol (C-O = 138.3(7) pm). Valence angle C(B1)-C-O = 108(2)°, torsion angle C(B1)-C-O-C(3) = 164(4)°.