Crystal structure of N-2,N-2-dimethylacetamidinium N,N-dimethylcarbamate

The title compound crystallizes in the monoclinic space group P2(1)/c with four formula units in a unit cell of dimensions a = 10.814(2), b = 8.400(2) , c = 11.398(4) Angstrom, beta = 110.86(2)degrees, V = 967.5(5) Angstrom(3) . The crystal structure is characterized by almost exactly planar [Me2NC(NH 2)Me](+) cations and [O2CNMe2](-) anions which are approximately perpendicu lar oriented to one another. The amidine N-1-C and N-2-C bond lengths are s ignificantly different (1.341(7) and 1.292(7) Angstrom, respectively) but t he C-O distances of the carbamate anion are equal within experimental error (1.263(6) and 1.256(6) Angstrom). An essential feature of the crystal stru cture are N-H ... O hydrogen bonds between cations and anions.