The structural diversity and luminescent properties of Zn(II) coordination assemblies with cyclohexane (or cyclohexene) dicarboxylate anions and two positional isomeric ligands

Four Zn(II) coordination polymers, namely {[Zn(chedc)(4,4′-Hbpt)]}n (1), {[Zn3(chadc)2(4,4′-Hbpt)2(4,4′-bpt)2]·3H2O}n (2), {[Zn2(chadc)2(3,3′-Hbpt)]}n (3) and {[Zn2(chedc)2(3,3′-Hbpt)]·H2O}n (4) (chadc = cis-1,2-cyclohexanedicarboxylate anion, chedc = cis-4-cyclohexene-1,2-dicarboxylate anion, 4,4′-Hbpt = 1H-3,5-bis(4-pyridyl)-1,2,4-triazole, 3,3′-Hbpt = 1H-3,5-bis(3-pyridyl)-1,2,4-triazole) have been produced by the reaction of two positional isomeric dipyridyl bridging ligands and two dicarboxylate anions with Zn(II) salts under hydrothermal conditions. Structural analysis reveals that 1 exhibits a double-chain and 2 exhibits a 3D network with a (62.10)2(64.102) topology, whilst 3 and 4 show similar layer structures. The luminescent properties of these complexes have been briefly investigated.

In this paper, four mixed-ligand Zn(II) coordination polymer have been designed and synthesized under hydrothermal conditions. Compounds 1–4 exhibit a double-chain, a 3D network with (62.10)2(64.102) topology and two polymeric coordination layer structures, respectively. The luminescent properties of the complexes have also been investigated in the solid state at room temperature.Figure optionsDownload as PowerPoint slideHighlights
► Four Zn(II) coordination polymers with new mixed-ligand system have been synthesized.
► Bpt isomers and dicarboxylate ligands displays diverse coordination modes.
► Their photoluminescent properties were also investigated.