Acta Cryst. (2009). E65, m676-m677  [ doi:10.1107/S160053680901842X ]

Poly[[aquabis(₃-isonicotinato-³O:O':N)tris(₂-isonicotinato-³O,O':N)(nitrato-O)bis(₄-oxalato-⁶O¹,O²:O²:O^1',O^2':O^1')dierbium(III)tetrasilver(I)] tetrahydrate]

Y.-M. Wen, T.-J. Feng and L.-X. He

Abstract: In the title coordination polymer, {[Ag₄Er₂(C₆H₄NO₂)₅(C₂O₄)₂(NO₃)(H₂O)]·4H₂O}_n, each Er^III atom is coordinated in a bicapped trigonal-prismatic coordination geometry by three O atoms from two isonicotinate (IN) ligands, four O atoms from two oxalate ligands and one O atom from either a nitrate ion or a water molecule, both of which are half-occupied over the same site. One Ag^I atom has a Y-shaped geometry defined by one N atom from one IN ligand, one O atom from another IN ligand and one O atom from an oxalate ligand. The other Ag^I atom is coordinated by two IN ligands and one O atom from an oxalate ligand. One of the IN ligands is disordered over an inversion center and forms a bridge between two centrosymmetric Ag^I ions. Due to the disorder, this IN ligand coordinates to the Ag atom through either the pyridyl N or the carboxylate O atoms. The IN and oxalate ligands link the Er and Ag atoms into a three-dimensional coordination framework. O-HO and C-HO hydrogen bonds are observed in the crystal structure.

Online 23 May 2009

Copyright © International Union of Crystallography
IUCr Webmaster