Syntheses, structures, and luminescence of two Zn(II) coordination polymers based on 5-(4-imidazol-1-yl-phenyl)-2H-tetrazole and carboxylates

Two Zn(II) coordination polymers with intricate 2-D network and 3-D framework with new 3-connected topology were constructed. Reactions of Zn(II) salts, 5-(4-(1H-imidazol-1-yl)phenyl)-1H-tetrazolate (HIPT) and 2-mercaptobenzoic acid or 2-propyl-1H-imidazole-4,5-dicarboxylic acid (H3PrIDC), result in two mixed-ligand coordination polymers (CPs), [Zn-2(IPT)(DSDB)(OH)](n) (H2DSDB=2,2-disulfanediyldibenzoic acid, 1) and [Zn-2(IPT)(PrIDC)(H2O)](n) (H3PrIDC=2-propyl-1H-imidazole-4,5-dicarboxylic acid, 2). Compound 1 possesses a 2-D structure built by 1-D [Zn(IPT)](n) chains and DSDB2- connectors, in which the DSDB2- is generated via in situ reaction from 2-mercaptobenzoic acid. It displays a new intricate 4-nodal {346789}{3678910}{389}{468} topology. Compound 2 displays a 3-D framework with new 3-connected topology with Schlafli symbol of (4810) (812(2)), in which the 1-D Zn-carboxylate chains were bridged by 3-connected IPT- ligands. The thermal stabilities and luminescence properties of 1 and 2 have also been studied. The compounds exhibit intense solid-state fluorescent emissions at room temperature.