Bis(diethylammonium) tetrachloridocuprate(II)

The structure of the title compound, (C4H12N)2[CuCl4] or [DEA]2[CuCl4] (DEA is diethyl­ammonium), at 84 (2) K has three crystallographically independent [CuCl4]2− anions in the asymmetric unit, each with a different geometry. These geometries range from essentially square-planar to compressed tetra­hedral geometry. The low-temperature structure reported here is the same as the room-temperature structure [Harlow & Simonsen (1976). Am. Crystallogr. Assoc. Ser. 2 Program Abstr. 4, Abstract PBlO], thereby confirming the absence of a low-temperature phase transition.