title: Poly[[tetra-aqua-(μ(4)-imidazole-4,5-dicarboxyl-ato)(μ(3)-imidazole-4,5-dicarboxyl-ato)-μ(3)-sulfato-μ(2)-sulfato-cobalt(II)dierbium(III)] monohydrate].
abstract: The asymmetric unit of the title compound, {[CoEr(2)(C(5)H(2)N(2)O(4))(2)(SO(4))(2)(H(2)O)(4)]·H(2)O}(n), contains a Co(II) ion, two Er(III) ions, two imidazole-4,5-dicarboxyl-ate (imdc) ligands, two SO(4) (2-) anions, four coordinated water mol-ecules and one uncoordinated water mol-ecule. The Co(II) ion is six-coordinated by two O atoms from two coordinated water mol-ecules and two O atoms and two N atoms from two imdc ligands in a slightly distorted octa-hedral geometry. Both Er(III) ions are eight-coordinated in a bicapped trigonal-prismatic coordination geometry. One Er(III) ion is coordinated by four O atoms from two imidazole-4,5-dicarboxyl-ate ligands, three O atoms from three SO(4) (2-) anions and one water O atom; the other Er(III) ion is bonded to five O atoms from three imdc ligands, two O atoms from two SO(4) (2-) anions as well as one coordinated water mol-ecule. The coordinated metal units are connected by bridging imdc ligands and sulfate ions, generating a two-dimensional heterometallic layer. The two-dimensional layers are stacked along the b axis via N-H⋯O, O-H⋯O and C-H⋯O hydrogen-bonding inter-actions between water mol-ecules, SO(4) (2-) anions, and imdc ligands, generating a three-dimensional framework.
authors: School of Chemistry and Environment, South China Normal University, Guangzhou 510631, People's Republic of China.
authors: Feng
authors: F
authors: Sun
references: Chem Commun (Camb). 2006 Dec 7;(45):4700-2
references: 17109041
references: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references: 18156677