Borosilicate-Based Framework: Synthesis, Single-Crystal Structure Study, and Physical Properties

Authors：Dong, Qiang; Zhang, Lei; Chen, Cailing; Xue, Miaomiao; Zhu, Zengkui; Wang, Xiang; Wang, Xin; Han, Yu^*; Li, Xinxiong^*; Zhang, Qichun^*

Source：Inorganic Chemistry, 2024, 63(5): 2663-2669.

DOI：10.1021/acs.inorgchem.3c03964

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Herein, we report the synthesis, crystal structure, and optical properties of a metal-free three-dimensional (3D) inorganic covalent framework ((H(2)en)-[Si-(B4O9)], named CityU-11, where H(2)en is the abbreviation for ethanediamine). With the assistance of a tiny amount of F- ions and the selection of SiO2 as Si sources, single crystals of CityU-11 can be successfully prepared under solvothermal conditions. The precise structure information on CityU-11 has been disclosed through both single-crystal X-ray diffraction (SCXRD) and low-dose high-resolution transmission electron microscopy (LD-HRTEM). The SCXRD results showed that CityU-11 crystallized in the noncentrosymmetric space group of Pnn2, while LD-HRTEM suggested that CityU-11 possessed almost the same interplanar distances of 0.6 nm for both (200) and (020) crystal planes, which finely matched with the double peaks of 2 theta = 15 degrees in the pattern of its powder X-ray diffraction (PXRD). CityU-11 also displayed an interesting optical property with a moderate birefringence of 0.0258@550 nm.

• Institution
  中国科学院福建物质结构研究所; y; 福州大学