Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.002 Å; R factor = 0.024; wR factor = 0.074; data-to-parameter ratio = 19.0.In the title compound, [Cu(ClO 4 ) 2 (C 12 H 8 N 2 )(H 2 O) 2 ], the Cu II atom is coordinated in a square-planar fashion by the two N atoms of a chelating 1,10-phenanthroline ligand and by two water molecules trans to the N atoms. The coordination sphere of the metal atom is augmented by O atoms of two weakly bonded perchlorate anions, thus yielding a strongly distorted CuN 2 O 4 octahedral environment. The crystal packing is stabilized by O-HÁ Á ÁO hydrogen bonds between the water molecules and the perchlorate anions. In addition, the organic molecules are associated by -stacking interactions between symmetry-equivalent antiparallel non-nitrogen aromatic rings, with interplanar distances of 3.543 (2) Å .
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