Five new Zn(II) and Cd(II) coordination polymers constructed by 3,5-bis-oxyacetate-benzoic acid: Syntheses, crystal structures, network topologies and luminescent properties

Five Zn(II) and Cd(II) coordination polymers, [Zn2(BOABA)(bpp)(OH)]·0.5H2O (1), [Cd3(BOABA)2(bpp)2(H2O)6]·2H2O (2), [Cd3(BOABA)2(2,2′-bipy)3(H2O)4]·5.5H2O (3), [CdNa(BOABA)(H2O)]2·H2O (4) and [Cd2(BOABA)(bimb)Cl(H2O)2]·H2O (5) (H3BOABA=3,5-bis-oxyacetate-benzoic acid, bpp=1,3-bi(4-pyridyl)propane, 2,2′-bipy=2,2′-bipyridine, bimb=1,4-bis(imidazol-1′-yl)butane), have been solvothermally synthesized and characterized by single-crystal X-ray diffraction, elemental analyses, IR spectra and TG analyses. 1 is an uninodal 4-connected 2D square grid network based on binuclear zinc clusters. 2 is 2D wavelike layer structure and further linked by hydrogen bonds into the final 3D (5,6,6)-connected topology network. 3 is 3-connected 2D topology network and the 2,2′-bipy ligands decorate in two different types. 4 is a (4,8)-connected 2D topology network with heterocaryotic {Cd2Na2} clusters and BOABA3– ligands. 5 can be rationalized as a (3,10)-connected 3D topology network with tetranuclear {Cd4Cl2} clusters and BOABA3– ligands. Meanwhile, photoluminescence studies revealed that these five coordination polymers display strong fluorescent emission bands in the solid state at room temperature.

Five new d10 metal(II) coordination polymers based on H3BOABA ligand were obtained and characterized. They display different topological structures and luminescent properties.Figure optionsDownload as PowerPoint slideHighlights
► Five d10 metal(II) polymers based on 3,5-bis-oxyacetate-benzoic acid were obtained.
► The polymers were structurally characterized by single-crystal X-ray diffraction.
► Polymers 1–5 display different topological structures.
► They show strong fluorescent emission bands in the solid state.