Crystal Structure of 1,2-Bis(cyanoimino)-3-triethylammonio-cyclopropenylide

The title compound, C11H15N5, crystallizes in the monoclinic space group P21/n with cell parameters a = 6.9935(1), b = 14.4416(3), c = 11.5160(2)A, β = 93.608(1)°. The zwitterionic molecular structure consists of a cyclopropene ring substituted by two cyanoimino and a triethylammonium group. The two NCN groups, the C3 ring and the N atom of the NEt3 group are coplanar. In the crystal, the molecules are stacked perpendicular to these planes.