Bis(μ-2,4-dihy­droxy­benzoato-κ(2) O:O′)bis­[aqua­(2,4-dihy­droxy­benzoato-κO)(1,10-phenanthroline-κ(2) N,N′)cadmium(II)]

In the title centrosymmetric dimeric Cd(II) complex, [Cd(2)(C(7)H(5)O(4))(4)(C(12)H(8)N(2))(2)(H(2)O)(2)], the Cd(II) cation is coord­inated by a bidentate phenanthroline (phen) ligand, three dihy­droxy­benzoate (dhba) anions and one water mol­ecule in a distorted CdN(2)O(4) octa­hedral geometry. Among the dhba anions, two anions bridge two Cd(II) cations to form the dimeric complex with significant different Cd—O bond distances of 2.2215 (19) and 2.406 (2) Å. The centroid–centroid distance of 3.4615 (19) Å between two nearly parallel benzene rings of the dhba and phen ligands coordinating to the same Cd(II) cation indicates the existence of intra­molecular π–π stacking in the complex. Extensive O—H⋯O hydrogen bonding and inter­molecular weak C—H⋯O hydrogen bonding help to stabilize the crystal structure. One hy­droxy group of the monodentate dhba ligand is disordered over two sites with a site-occupancy ratio of 0.9:0.1.