Acta Cryst. (2008). E64, m1324  [ doi:10.1107/S1600536808030468 ]

catena-Poly[[dipyridinemercury(II)]--5-amino-2,4,6-triiodoisophthalato]

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

Abstract: The reaction of mercury(II) chloride with 5-amino-2,4,6-triiodoisophthalic acid in pyridine solution leads to the formation of the title compound, [Hg(C₈H₂I₃NO₄)(C₅H₅N)₂]_n. The structure contains a four-coordinate Hg²⁺ ion in a distorted tetrahedral geometry, which lies on a crystallographic twofold axis. The Hg²⁺ ion is bonded to two N atoms from two pyridine ligands and two carboxylate O atoms from two 5-amino-2,4,6-triiodoisophthalate anions. The two carboxylate groups of individual 5-amino-2,4,6-triiodoisophthalate anions act as a bridge to the Hg centers. This anion also resides on a twofold axis, which passes through the amino N and the trans standing I atoms. The Hg-O distance is 2.337 (6) and the Hg-N distance is 2.244 (8) Å.

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