Calcium(II) meso-2,3-diphenylsuccinate heptahydrate

The title compound, [Ca(C16H12O4)(H2O)(6)]. H2O, adopts a conformation abou t the central CDC bond that places the two carboxylate groups in an anti or ientation. The crystal consists of layers of two-dimensional arrays of 2,3- diphenylsuccinate dianions which are linked by bridging Ca2+ cations. The u nit cell contains two Ca2+ cations in an unusual four-membered Ca-O-Ca-O ri ng in which the bridging O atoms belong to water molecules rather than carb oxylates, i.e. poly[[[di-mu-aqua-bis[pentaaquacalcium(II)]]-mu-(meso-2,3-di -phenylsuccinato-O:O')] succinate dihydrate].