Channel Structure Formed by Hydrogen Bonds and Filled by Water Molecules and Dodecatungstosilicate Anions
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A new compound consisting of Keggin-type polyoxometalate and transition metal complex, [Cr(apca)2(H2O)2]4[SiW12O40]·12H2O(1), (apca− = 3-aminopyrazine-2-carboxylate anion), was synthesized with conventional method and characterized by single crystal X-ray diffraction, elemental analysis, IR spectroscopy, TG analyses, PXRD. Fluorescent property was explored. The [SiW12O40]4− anions and complex cations [Cr(apca)2(H2O)2]+ in compound 1 are connected by hydrogen bonds and π–π interaction, forming the 3D structure. Especially, [Cr(apca)2(H2O)2]+ cations are linked into left-hand helical chain extending along c-axis through hydrogen bonds, forming a channel A. The chains connect other four chains from four directions also through hydrogen bonds, then the four chains enclose a channel B whose inside dimension is a little bigger than that of A, polyoxoanions fill in the channel B, and free waters in the channel A. Compound 1 shows an asymmetric wide emission band at λmax = 435 nm, which may belongs to the intraligand π* → π transition.
KeywordsPhotoluminescence Channel structure Polyoxotungstate Chromium 3-Aminopyrazine-2-carboxylic acid
This work was supported by the National Natural Science Foundation of China (No. 81501423) and Norman Bethune Program of Jilin University (No. 2015223).
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Conflict of interest
The authors declare that they have no conflict of interests.
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