title: catena-Poly[[bis-(μ(3)-5-hy-droxy-isophthalato)bis-(pyrazino-[2,3-f][1,10]phenanthroline)dicadmium] dihydrate].
abstract: The title coordination polymer, {[Cd(2)(C(8)H(4)O(5))(2)(C(14)H(8)N(4))(2)]·2H(2)O}(n), has a layered structure. The asymmetric unit contains two Cd(II) ions, two pyrazino-[2,3-f][1,10]phenanthroline, two 5-hy-droxy-isophthalate (hip) ligands and two lattice water mol-ecules. Each Cd(II) ion is coordinated by two N atoms from a chelating pyrazino-[2,3-f][1,10]phenanthroline and four O atoms from three different hip ligands, resulting in a distorted CdN(2)O(4) octa-hedral coordination environment. The hip ligand connects adjacent Cd(II) ions, forming forming layers parallel to (010). Intralayer O-H⋯O hydrogen bonds involving the hydroxy groups and solvent water molecules consolidate the crystal packing.
authors.affiliation: Department of Forensic Chemistry, China Criminal Police University, Shenyang 110854,  People's Republic of China.
authors.forename: Peng-Cheng
authors.initials: PC
authors.lastname: Zhao