Aquadi‐μ‐chloro‐bis­(diethyl­enetriamine)dicopper(II) dichloride: a redetermination at 180 K

The structure of the title compound, [Cu2Cl2(C4H13N3)2(H2O)]Cl2, at 180 K is described in space group P21/n with a unit‐cell volume twice that reported previously for the structure at 293 K [Willett (2001). Acta Cryst. E57, m605–m606]. In the smaller unit cell, in space group P21/m, the complex has imposed mirror symmetry and unusually elongated displacement ellipsoids. At 180 K, refinement in the larger unit cell with no imposed symmetry resolves this issue. With room‐temperature data collected from the same crystal, however, refinement using the larger unit cell gives no significant improvement, and the previously reported structure is considered to be most appropriate.