Abstract: | The title compound, [Cu2(C8H4O4)(C12H8N2)4](ClO4)2, was prepared from the hydrothermal reaction of CuCl2, 1,4‐dicyanobenzene, 1,10‐phenanthroline and water at 443 K. The compound is a dimer in which the cation lies about an inversion center. The terephthalate moiety acts as a bridging ligand and the phenanthrolines as terminal ligands. The unique Cu atom is coordinated by two O and four N atoms in a distorted octahedral geometry, with Cu—O distances of 1.955 (2) and 2.815 (2) Å, and Cu—N distances of 2.008 (2) to 2.216 (2) Å. |