title: catena-Poly[[[tetra-aqua-erbium(III)]-μ-oxalato-κO,O:O,O] [bromidobis(pyrazine-2-carboxyl-ato-κN,O)cuprate(II)] tetra-hydrate].
abstract: In the title heterometallic complex, {[Er(C(2)O(4))(H(2)O)(4)][CuBr(C(5)H(3)N(2)O(2))(2)]·4H(2)O}(n), the Er(III) atom is eight-coordin-ated by four O atoms from two centrosymmetric oxalate ligands and four water mol-ecules, displaying a bicapped trigonal-prismatic geometry. The oxalate ligands bridge the Er atoms into a polymeric cationic chain along [110]. The Cu(II) atom is five-coordinated in a square-pyramidal geometry by two pyrazine-2-carboxyl-ate ligands and a Br atom, forming a discrete anion. The polymeric cations, complex anions and uncoordinated water mol-ecules are self-assembled into a three-dimensional supra-molecular network through O-H⋯N, O-H⋯O and O-H⋯Br hydrogen bonds.
authors: Department of Chemistry, Jinan University, Guangzhou 510632, People's Republic of China.
authors: Hui-Fu
authors: HF
authors: Yang
authors: Shi-Hai
authors: SH
authors: Xu
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