Two new three-dimensional pillared layered coordination polymers, [M(2,5-PDC)H2O]n [M(II) = Sr(1), Ba (2)] were synthesized under hydrothermal conditions using alkaline–earth metal centers strontium and barium with 2,5-pyridinedicarboxylic acid as the organic ligand. The structures of two compounds have been determined by single-crystal X-ray diffraction analyses and further characterized by IR spectrum, elemental analyses, powder X-ray diffraction, and thermogravimetric analyses. The compounds are isostructural, confirmed by their powder XRD measurements. They feature a pillared layered framework structures. Within the layer, the dinuclear [M2O2] units through the bridge of the coordination water molecule are found, which are connected by carboxylate groups along the a- and b-axis, respectively. The layers are further pillared by the pyridyl groups of the 2,5-PDC2− ligands. Furthermore, the luminescent properties of two compounds have also been investigated in the solid state.
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This work is supported by National Natural Science Foundation of China (No. 21101019) and the Key Subject of Chizhou College (2011XK04). We also thank Prof. Li-Min Zheng and Dr. Zhong-Sheng Cai at Nanjing University for the physical properties measurements.
CCDC 936685 and 936686 contains the supplementary crystallographic data for compounds 1 and 2, respectively. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_reques/cif. The other supplementary materials (including the IR spectrum, PXRD patterns of two compounds, and the structure figures of compound 2) are provided. (DOC 303 kb)