Crystal structure of catena-poly[[cadmium(II)-di-μ(2)-bromido-μ(2)-l-proline-κ(2) O:O′] monohydrate]

In the title coordination polymer, {[CdBr(2)(C(5)H(9)NO(2))]·H(2)O}(n), the Cd(II) ion is coordinated by four bromido ligands and two carboxyl­ate oxygen atoms of two symmetry-related proline ligands, which exist in a zwitterionic form, in a distorted octa­hedral geometry. There is an intra­molecular N—H⋯O hydrogen bond between the amino group and the carboxyl­ate fragment. Each coordinating ligand bridges two Cd(II) atoms, thus forming polymeric chains running along the c-axis direction. The water mol­ecules of crystallization serve as donors for the weak inter­molecular O—H⋯O and O—H⋯Br hydrogen bonds that link adjacent polymeric chains, thus forming a three-dimensional structure. N—H⋯O and N—H⋯Br hydrogen bonds also occur.