Organic Carboxylate Ligand Tuned Topological Variations in Three Zn(Ⅱ) Coordination Polymers: Syntheses,Crystal Structures and Photoluminescent Properties

Three new Zn(Ⅱ) coordination polymers, namely Zn_2(suc)_2(bib)_2]_n·nH_2 O(1), Zn(glu)(bib)]_n·4 nH_2 O(2), and Zn(adp)(bib)]n(3)(bib = 1,4-bis(N-imidazolyl)butane, H_2 suc = succinic acid, H_2 glu = glutaric acid, H_2 adp = adipic acid) have been hydrothermally synthesized and structurally characterized. Compound 1 features a 3D framework with 4-connected hxg-d topological network, compound 2 is comprised of 2D 4~4-sql-type sheets, and the adjacent 2D sheets are further packed into a 3D supramolecular architecture via intermolecular hydrogenbonding interactions, and compound 3 is a 3D framework with 4-fold interpenetrating dia topology. The structural comparison of these three compounds demonstrates that the topological variations can be well controlled by employing aliphatic dicarboxylate ligands with different spacer lengths. Moreover, the thermal stabilities and photoluminescent properties of them were also studied in detail.