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A new binary Zn II  coordination polymer, [Zn(2-cpa)(H 2 O)]   n    ( 2D-Zn ) has been prepared by a 120 °C hydrothermal reaction of zinc(II) sulfate heptahydrate and 2-carboxy phenoxyacetic acid (2-H 2 cpa) in the presence of potassium hydroxide. Single-crystal X-ray diffraction analysis shows that the Zn II  ion is located in a deformed ZnO 6  octahedron bonded by one water and three 2-carboxy phenoxyacetate (2-cpa) ligands. The 2-cpa exhibits pentadentate double bridging chelate- μ   3  coordination mode and connects adjacent Zn II  ions to generate a corrugated (4,4)-connected layer structure. The structures, conformation of 2-cpa and photoluminescence spectra for  2D-Zn  have been carefully analyzed and compared with its two closely related compounds ̶ 1D [Zn(2-cpa)(H 2 O)]   n    ( 1D-Zn ) and mononuclear [Zn(2-cpa)(H 2 O) 3 ] ( 0D-Zn ). The results showed that the conformation of 2-cpa in  2D-Zn  has the maximum alteration and the corresponding fluorescence emission peak of  2D-Zn  has the largest red-shift of 62 nm compared with that of free 2-H 2 cpa.

zeitschrift für kristallographie - crystalline materials

A (4,4)-connected zinc(II) coordination polymer constructed with the flexible 2-carboxy phenoxyacetate ligand: synthesis, conformation alteration and fluorescent properties