Abstract
Two novel borates [(CH3)3NH][B5O6(OH)4] (I) and Na2[H2TMED][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. Na2[H2TMED][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 Na2[H2TMED][B7O9(OH)5]2 in the solid state at room temperature was also investigated by fluorescence spectrophotometer.
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Acknowledgments
The authors are thankful for the financial supports from the China (Nos. 20871078 and 21173143), the Research Program of science and technology at Universities of Inner Mongolia Autonomous Region of China (Nos. NJZY13284 and NJZC13283), and the National Natural Science Foundation of Inner Mongolia Autonomous Region (No. 2013MS0202). The Project (No. 20130312) is supported by Inner Mengolia Science & Technology Plan.
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Li, P., Li, LQ., Huang, HS. et al. Solvothermal Syntheses and Crystal Structures of Two Novel Borates: [(CH3)3NH][B5O6(OH)4] and Na2[H2TMED][B7O9(OH)5]2 . J Clust Sci 25, 893–903 (2014). https://doi.org/10.1007/s10876-013-0663-3
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DOI: https://doi.org/10.1007/s10876-013-0663-3