Acta Cryst. (2003). E59, m249-m251  [ doi:10.1107/S1600536803007918 ]

catena-Poly[[[tetraaqualanthanum(III)]-di--isoniconitinato-²O:O'] nitrate]

L.-Z. Cai, M.-S. Wang, G.-W. Zhou, G.-C. Guo, J.-G. Mao and J.-S. Huang

Abstract: The structure of the title compound, {[La(C₆H₄NO₂)₂(H₂O)₄](NO₃)}_n, consists of an infinite cationic chain, [La(C₆H₄NO₂)₂(H₂O)₄]⁺, and well separated (NO₃)^- anions. The La^III atom is eight-coordinated by four O atoms from four isonicotinate ligands and four water molecules. The coordination geometry around the La centre can be described as a distorted square antiprism. The La atoms are bridged by two carboxylate groups of two isonicotinate ligands to form an infinite chain along the c direction. The carboxylate-bridged chains are linked to each other via hydrogen bonds between pyridyl N atoms and coordinated water molecules to form a three-dimensional network with channels in which the nitrate anions are located, and the intermolecular hydrogen bonds are formed between the nitrate anions and cationic chains.

Online 23 April 2003

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