Monoclinic polymorph of poly[[di-μ-aqua-triaquadi-μ-oxalato-barium(II)­copper(II)] monohydrate]

A monoclinic polymorph of the title compound, {[BaCu(C(2)O(4))(2)(H(2)O)(5)]·H(2)O}(n), is reported. The structure is best described as a coordination polymer where the Cu(II) and Ba(II) centers are coordinated by five and nine O atoms, respectively, in capped quadratic antiprismatic and tetragonal pyramidal geometries. The polymerization arises due to the presence of bridging mono- and bidentate oxalate ligands as well as bridging water mol­ecules. The crystal structure is consolidated by a three-dimensional network of hydrogen bonding.