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

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.