Syntheses, Structures, and Luminescent Properties of Two Alkaline Earth Metal Coordination Polymers from Hydroxymethyl Imidazole Dicarboxylate
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Two new alkaline earth metal coordination polymers, which are [Ba(H2IDC)-(H3HmIDC)(H2O)2]n (I) and [Sr(H2HmIDC)]n (II) [H3IDC = 1H-imidazole-4,5-dicarboxylic acid, H4HmIDC = 2-(hydroxymethyl)-1H-imidazole-4,5-dicarboxylic acid), respectively, have been successfully synthesized under solvothermal conditions by employing H4HmIDC as the starting material. Both compounds I and II were structurally characterized by diverse techniques, such as single crystal X-ray diffraction (CIF files CCDC nos. 1839705 (I) and 1839706 (II)), FT-IR spectra, powder X-ray diffraction, and thermogravimetric analyses. Compound I exhibits a two-dimentional (2D) coordination network with a (4, 4) topology based on dinuclear [Ba2O4] as second building units (SBUs). Whereas compound II features a 3D coordination framework based on infinite 1D inorganic chains as SBUs, which can be further simplified as a 5‑connected noy topology. In addition, the photoluminescent properties of both compounds I and II were also investigated.
Keywords:imidazole-4,5-dicarboxylate alkaline earth metal coordination polymer luminescent property
This work was fnancially supported by the National Natural Science Foundation of P.R. China (grant nos. 21603076, 21571070 and 21473062), the Natural Science Foundation of Guangdong Province (grant nos. 2016A030310437 and 2018A030313193), and the Undergraduates’ Innovating Experimentation Project of SCNU and Guangdong Province (grant no. 20181462).
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