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The hydro­thermal reaction of cadmium(II) nitrate with 5-amino-2,4,6-triiodo­isophthalic acid and pyridine in DMF solution leads to the formation of the title compound, [Cd(C 8 H 2 I 3 NO 4 )(C 5 H 5 N) 2 ]  n  . The structure contains a four-coordinate Cd 2+  ion in a distorted tetra­hedral geometry, which lies on a crystallographic twofold rotation axis. The Cd 2+  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 Cd—O distances are 2.429 (5) and 2.305 (5) Å and the Cd—N distance is 2.236 (8) Å. The two carboxyl­ate groups of individual 5-amino-2,4,6-triiodo­isophthalate anions act as a bridge to the Cd 2+  atoms. leading to a chain structure along the  c  axis.

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