Synthesis,structure and selective luminescence sensing for iron(III) ions of a three‐dimensional zinc(II) (4,6)‐connected coordination network |
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Authors: | Feng Su Cheng-Yong Zhou Lin-Tao Wu Xi Wu Chun Han Zhi-Jun Wang |
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Abstract: | Coordination polymers constructed from conjugated organic ligands and metal ions with a d10 electronic configuration exhibit intriguing properties for chemical sensing and photochemistry. A ZnII‐based coordination polymer, namely poly[aqua(μ6‐biphenyl‐3,3′,5,5′‐tetracarboxylato)(μ2‐4,4′‐bipyridine)dizinc(II)], [Zn2(C16H6O8)(C10H8N2)(H2O)2]n or [Zn2(m,m‐bpta)(4,4′‐bipy)(H2O)2]n, was synthesized from a mixture of biphenyl‐3,3′,5,5′‐tetracarboxylic acid [H4(m,m‐bpta)], 4,4′‐bipyridine (4,4′‐bipy) and Zn(NO3)2·6H2O under solvothermal conditions. The title complex has been structurally characterized by IR spectroscopy, elemental analysis, single‐crystal X‐ray diffraction and powder X‐ray diffraction analysis, and features a μ6‐coordination mode. The ZnII ions adopt square‐pyramidal geometries and are bridged by two syn–syn carboxylate groups to form [Zn2(COO)2] secondary buildding units (SBUs). The SBUs are crosslinked by (m,m‐bpta)4? ligands to produce a two‐dimensional grid‐like layer that exhibits a stair‐like structure along the a axis. Adjacent layers are linked by 4,4′‐bipy ligands to form a three‐dimensional network with a {44.610.8}{44.62} topology. In the solid state, the complex displays a strong photoluminescence and an excellent solvent stability. In addition, the luminescence sensing results indicate a highly selective and sensitive sensing for Fe3+ ions. |
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Keywords: | three‐dimensional coordination polymer biphenyl‐3,3′ ,5,5′ ‐tetracarboxylate 4,4′ ‐bipyridine zinc complex crystal structure topological analysis fluorescence properties iron(III) sensing chemical sensing |
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