Acta Cryst. (2008). E64, m1392-m1393  [ doi:10.1107/S1600536808032017 ]

catena-Poly[[[aquatripyridinecobalt(II)]--5-amino-2,4,6-triiodoisophthalato-²O¹:O³] pyridine solvate]

Y. Zhang, J. Zhao, G. Tang and Z. Jiang

Abstract: The reaction of cobalt(II) nitrate with 5-amino-2,4,6-triiodoisophthalic acid (ATPA) in pyridine solution leads to the formation of the title compound, {[Co(C₈H₂I₃NO₄)(C₅H₅N)₃(H₂O)]·C₅H₅N}_n. The Co²⁺ ion is six-coordinated by three N atoms, one water O atom and two O atoms from two ATPA ligands to form a distorted octahedral geometry. The two carboxylate groups of ATPA act as bridging ligands connecting the Co^II metal centers to form one-dimensional zigzag chains along the c axis, with Co-O distances in the range 2.104 (4)-2.135 (4) Å. The average Co-N distance is 2.171 Å. A classical O-HN hydrogen bond is formed by the coordinating water molecule and the pyridine solvent molecule. The structure was refined from a racemically twinned crystal with a twin ratio of approximately 8:1.

Online 15 October 2008

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