STRUCTURE OF METHYLAMMONIUM HYDROGEN MALONATE (I) AND METHYLAMMONIUM MALONATE (II)

(I), CH6N+.C3H3O4-, M(r) = 135.12, monoclinic, P2(1)/c, a = 8.017 (1), b = 9.245 (1), c = 8.582 (1) angstrom, beta = 92.78 (1)-degrees, V = 635.3 (2) angstrom 3, T = 293 (2) K, D(m) = 1.39 (2), D(x) = 1.413 g cm-3, Z = 4, F(000) = 288, Mo K-alpha radiation, lambda = 0.71069 angstrom, mu = 1.187 cm-1, final R = 0.033 and wR = 0.031 for 1191 observed reflections. (II), 2CH6N+.C3H2O4(2-), M(r) = 166.18, monoclinic, P2(1)/c, a = 9.185 (1), b = 11.225 (1), c = 8.810 (1) angstrom, beta = 97.05 (1)-degrees, V = 901.5 (3) angstrom 3, T = 293 (2) K, D(m) = 1.23 (2), D(x) = 1.224 g cm-3, Z = 4, F(000) = 360, Mo K-alpha radiation, lambda = 0.71069 angstrom, mu = 0.979 cm-1, final R = 0.034 and wR = 0.038 for 1289 observed reflections. In methylammonium hydrogen malonate asymmetric intermolecular hydrogen bonds [2.544 (1) angstrom] link the non-planar hydrogen malonate groups in chains that are fixed in a three-dimensional network by O-N hydrogen bonds ranging from 2.799 (1) to 2.990 (1) angstrom. Methylammonium groups in methylammonium malonate take part in the hydrogen-bonding system to the malonate ion [2.735 (2)-2.810 (2) angstrom].