Crystal structure of μ-4-oxidobenzoato-κ2O1:O4-bis[bis(1,10-phenanthroline-κ2N,N′)copper(II)] bis(4-hydroxybenzoate) 7.5-hydrate

The title hydrated complex, [Cu2(C7H4O3)(C12H8N2)4](C7H5O3)2·7.5H2O, is composed of dinuclear CuII complex cations, noncoordinating 4-hydroxybenzoate anions and water molecules of crystallization. In the dinuclear complex cation, the CuII ions are bridged by a 4-oxidobenzoate ligand and thus each metal ion is five-coordinated by two chelating 1,10-phenanthroline (phen) molecules and one anionic O atom in a distorted trigonal-bipyramid geometry. In the crystal, aromatic π–π stacking occurs between phen rings of neighbouring dinuclear CuII complex cations, forming two-dimensional supramolecular systems parallel to (100).