Tetra-ethyl-ammonium 7,12-di-cyano-1-carba-closo-dodeca-borate.
In the title compound, C8H20N(+)·C3H10B11N2 (-), the carborane anion cage displays nearly-perfect Cs symmetry, with the two CN groups lying on a noncrystallographic mirror plane that bis-ects the cage. In the crystal, the anions form extended chains along the a-axis direction, with C-H⋯N hydrogen bonds linking consecutive anions. The C N bond lengths (and B-C N angles) in the nitrile moities are 1.1201 (19) Å, 178.60 (15)° and 1.1433 (17) Å, 179.45 (15)°, similar to those observed in organic nitriles. A hydrogen bond between a methylene H atom of the cation and the N atom in one of the nitrile groups of the anion is the closest contact between the anion and cation, at 2.52 Å.
Department of Chemistry, Whitman College, Walla Walla, WA 99362, USA.
Marcus A
MA
Juhasz
Department of Physics, Whitman College, Walla Walla, WA 99362, USA.
Douglas H
DH
Juers
Department of Chemistry, Whitman College, Walla Walla, WA 99362, USA.
Gregory E
GE
Dwulet
Department of Chemistry, Whitman College, Walla Walla, WA 99362, USA.
Aaron J
AJ
Rosenbaum