Solvothermal Syntheses and Crystal Structures of Two Novel Borates: [(CH3)3NH][B5O6(OH)4] and Na2[H2TMED][B7O9(OH)5]2 |
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Authors: | Ping Li Lian-Qing Li Hong-Sheng Huang Zhi-Hong Liu |
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Institution: | 1. Key Laboratory for Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an, 710062, People’s Republic of China 2. Department of Chemistry, Jining Teachers College, Wulanchabu, 012400, People’s Republic of China
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Abstract: | Two novel borates (CH3)3NH]B5O6(OH)4] (I) and Na2H2TMED]B7O9(OH)5]2 (II) have been synthesized under solvothermal conditions, and characterized by elemental analyses, FT-IR spectroscopy, and single crystal X-ray diffraction. Crystal data for I: monoclinic, P21/c, a = 9.3693(11) Å, b = 14.0375(17) Å, c = 10.0495(9) Å, β = 91.815(9)°, Z = 4. Crystal data for II: monoclinic, P21/c, a = 11.6329(2) Å, b = 11.9246(3) Å, c = 10.2528(2) Å, β = 100.178(2)°, Z = 4. Their crystal structures both have 3D supramolecular framework with large channels constructed by O–H···O hydrogen-bonding among the polyanions of B5O6(OH)4]? or B7O9(OH)5]2? clusters. The templating organic amines cations in I and II are both located in the channels of 3D supramolecular frameworks, respectively, and interact with the polyborate frameworks both electrostatically and via hydrogen bonds of N–H···O. Na2H2TMED]B7O9(OH)5]2 is the first example of heptaborate co-templated by alkali metal and organic base, which is also rare in borates. The photoluminescence property of the synthetic sample of Na2H2TMED]B7O9(OH)5]2 in the solid state at room temperature was also investigated by fluorescence spectrophotometer. |
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