Abstract
Two new Zn(II) coordination polymers (CPs), formulated as [Zn(3-cptpy)Cl]n (1) and [Zn2(3-cptpy)2(DCB)(H2O)2]n·2nH2O (2) (3-Hcptpy = 4′-(4-carboxyphenyl)-3,2′:6′,3″-terpyridine, H2DCB = terephthalic acid), have been hydrothermally synthesized and characterized by IR spectroscopy, single-crystal and powder X-ray diffractions, and thermogravimetric analysis. 1 is constructed by Zn atoms, 3-cptpy− bridges and terminal Cl− ligands to form a two-dimensional (2-D) 3-connected layer structure. These layers link with each other via hydrogen bonds to form a three-dimensional (3-D) supramolecular framework. 2 displays a 1-D zigzag chain structure, which is fabricated by Zn atoms, 3-cptpy− and DCB2− bridges. Hydrogen bonds connect with zigzag chains to form a 3-D supramolecular architecture. 1 and 2 exhibit stronger emissions than 3-Hcptpy. Moreover, 1 shows highly sensitive and selective response to 2,4,6-trinitrophenol through luminescence quenching effect. The emission quenching mechanism of detecting TNP for 1 was explored as well.
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