Synthesis, Structure, and Properties of the Noncentrosymmetric Hydrated Borate Na2B5O8(OH)·2H2O

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• 作者：Yongjiang Wang ; Shilie Pan ; Xuelin Tian ; Zhongxiang Zhou ; Gang Liu ; Jide Wang ; Dianzeng Jia
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：August 17, 2009
• 年：2009
• 卷：48
• 期：16
• 页码：7800-7804
• 全文大小：773K
• 年卷期：v.48,no.16(August 17, 2009)
• ISSN：1520-510X

文摘

Single crystal of hydrated sodium borate Na₂B₅O₈(OH)·2H₂O has been grown with sizes up to 5 × 5 × 3 mm³ under mild hydrothermal conditions at 180 °C. The structure is determined by single-crystal X-ray diffraction and further characterized by IR and TG analyses. It crystallizes in the orthorhombic space group Pna2₁, with a = 11.967(2) Å, b = 6.5320(13) Å, c = 11.126(2) Å, Z = 4, R1 = 0.0183, and wR2 = 0.0483. The crystal structure of Na₂B₅O₈(OH)·2H₂O is made up of Na−O polyhedra, and [B₅O₈(OH)]²⁻ polyborate anions. Transmittance spectrum is performed on the Na₂B₅O₈(OH)·2H₂O crystal, which shows an absorption edge less than 190 nm in the UV region. The powder second-harmonic generation intensity measured by the Kurtz−Perry method indicates that Na₂B₅O₈(OH)·2H₂O is about half that of KH₂PO₄ (KDP).