The title compound contains four isolated and discrete moieties, i.e.
two independent [(CH3)(4)N](+) cations, with one ordered on a 4 axis a
nd the other disordered with the central N atom on a 2(z) axis, one [(
C2H5)(4)N](+) cation, on a mirror plane and in a trans conformation, a
nd one distorted tetrahedral [CuCl4](2-) anion on another mirror. The
crystal structure is isomorphous with that of [(C2H5)(4)N][(CH3)(4)N][
ZnCl4] [Caetano, Lapasset & Saint Gregoire (1995). Acta Cryst. C51, 22
0-222].