Crystal and molecular structure of bis(tetramethyl-ammonium)bis(maleonitriledithiolato)cuprate(II). Structure of C<inf>16</inf>H<inf>24</inf>CuN<inf>6</inf>S<inf>4</inf>

The crystal and molecular structure of the title compound, C16H24CuN6S4, is reported. The crystals are monoclinic: space group P21/c, Z=4, a=13.230(3), b=11.518(9), c=16.269(6) Å, β=95.07(2)°. The structure was solved by the heavy-atom method, and refined by full-matrix least squares to R=0.059 for 1907 unique diffractometer data. The anions have approximately 222 (D2) symmetry, with an angle of 41.14(1)° between the normals to planes of the ligands. The amino atoms of the cations have an approximate tetrahedral configuration. The anions are well separated from each other, the closest Cu-Cu distance being 7.811 (2) Å. The anionic units can be considered as being stacked along b in columns. The metal atoms are not collinear along the stack axis, but form a kind of kinked chain. © 1984 Plenum Publishing Corporation.