Acta Cryst. (2006). E62, m3080-m3082  [ doi:10.1107/S160053680604373X ]

catena-Poly[[diaqua(isonicotinato-²O,O')erbium(III)]-di--isonicotinato-⁴O:O']

G.-M. Wang, C.-S. Duan, Z.-X. Li, S.-Y. Xue and Q. Liang

Abstract: In the title compound, [Er(IN)₃(H₂O)₂]_n, where IN is the isonicotinate anion, C₆H₄NO₂^-, the asymmetric unit contains one half-molecule. The Er^III atom lies on a crystallographic twofold axis and is coordinated by four and two carboxylate O atoms from bridging and chelating isonicotinate groups, respectively, and by two O atoms from water molecules, yielding an eight-coordinate square-antiprismatic geometry. In the crystal structure, the polymer features an infinite doubly carboxylate-bridged chain-like structure with one chelating carboxylate group on each metal centre. Adjacent chains are, in turn, connected to each other through intermolecular O-HO and O-HN hydrogen bonds, forming a three-dimensional network.

Online 25 October 2006

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