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Synthesis,Structural Characterization and Properties of Two Strontium Borates Constructed from Oxo Boron Clusters |
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| Authors: | Qin Meng Guo-Ming Wang Jing Xue Bai-Feng Yang Huan He Guo-Yu Yang |
| Affiliation: | 1. MOE Key Laboratory of Cluster Science, School of Chemistry, Beijing Institute of Technology, Beijing, 100081, China 2. Teachers College, College of Chemistry and Environment of Qingdao University, Qingdao, 266071, Shandong, China 3. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, Fujian, China |
| Abstract: | Two strontium borates Sr2[B6O9(OH)4] (1) and Sr2B5O9(OH)·H2O (2), with acentric structures have been synthesized under hydro/solvothermal conditions. Compound 1 is reported for the first time in the strontium borates system, and it crystallizes in the monoclinic space group P21 with unit cell parameters a = 6.8445(5) Å, b = 8.7033(6) Å, c = 8.4632(6) Å, β = 100.581(6)°, V = 495.58(6) Å3 and Z = 2. Its structure consists of unusual borate layers of 3, 11-membered rings, which are interconnected via Sr–O ionic bonds and hydrogen bonds to generate a 3D supramolecular network. Compound 2 is a known strontium borate, crystallizing in the monoclinic space group C 2 with a = 10.161 (13) Å, b = 7.965(4) Å, c = 6.393(11) Å, β = 128.0(2)°, V = 407.7(14) Å3 and Z = 2. Second-harmonic generation measurements on the powder samples reveal that 1 and 2 exhibits good SHG efficiency about 1.5 and 2 times that of KDP (KH2PO4) powder respectively. |
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