A Novel Three-Dimensional Ni(Ⅱ)Complex:Synthesis,Crystal Structure and Detection for Fe3+,CrO42-and Cr2O72-in Water
A novel Ni(Ⅱ)coordination polymer[Ni(pdc)(bib)(H2O)]n(Ni-CP)was synthesised by solvothermal method with 3,5-pyridyl dicarboxylic acid(3,5-H2pdc),1,4-bis(1-imidazolyl)benzene(bib)and Ni(NO3)2,and characterized by single-crystal X-ray diffraction,powder X-ray diffraction,thermogravimetric,IR spectroscopic and fluorescence spectroscopy analysis.The results show that Ni-CP crystallized as a monoclinic system with C2/c space group.The asymmetric unit of Ni-CP was comprised of one Ni(Ⅱ),two half bib ligands,one completely deprotonated 3,5-pdc2-ligands and one coordinated water molecule.The environment around central Ni(Ⅱ)can be described as irregular hexacoordination octahedral geometry of NiO3N3.The bib and 3,5-pdc2-ligands were bridged by the bidentate coordination mode in theμ2-η1∶η1 fashion and the tridentate coordination mode in the μ3-η1∶η1∶η1 fashion to form a three-dimensional network framework.From a topological point of view,the two-dimensional frame structure can be simplified to a 3-connected topology with a Schläfli symbol(4·82).We consider the 3,5-pdc2-ligands and Ni(Ⅱ)as nodes and the bib ligands as connectors,forming a three-dimensional structure can be simplified to a 3,5-connected double nodes with topological symbols(4·6·8)(4·62·87).The porosity of Ni-CP is 17.4％.Ni-CP could selectively detect Fe3+,CrO42-and Cr2 O72-with detection limits of 4.275 × 10-5,2.681 × 10-5,2.681 × 10-5 mol/L,respectively,and have a high quenching rate.
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