A one-dimensional silver(I) coordination polymer based on 5-methyl-1,3,4-thiadiazol-2-amine and pyridine-2,3-dicarboxylate.

The bifunctional pyridine-2,3-dicarboxylic acid (H2 pdc) ligand has one N atom and four O atoms, which could bind more than one AgI centre with diverse binding modes. A novel infinite one-dimensional AgI coordination polymer, namely catena-poly[[silver(I)-(μ2 -pyridine-2,3-dicarboxylato-κ2 N:O3 )-silver(I)-tris(μ2 -5-methyl-1,3,4-thiodiazol-2-amine-κ2 N:N')] monohydrate ethanol monosolvate], {[Ag2 (C7 H3 NO4 )(C3 H5 N3 S)3 ]·H2 O·C2 H5 OH}n , has been synthesized using H2 pdc and 5-methyl-1,3,4-thiadiazol-2-amine (tda), and characterized by single-crystal X-ray diffraction. One AgI atom is located in a four-coordinated AgN4 tetrahedral geometry and the other AgI atom is in a tetrahedral AgN3 O geometry. A dinuclear AgI cluster formed by three tda ligands with a paddelwheel configuration is bridged by the dianionic pdc2- ligand into a one-dimensional coordination polymer. Interchain N-H...O hydrogen bonds extend the one-dimensional chains into an undulating two-dimensional sheet. The sheets are further packed into a three-dimensional supramolecular framework by interchain N-H...O hydrogen bonds.