Cooperation of Three Chromophores Generates the Water-Resistant Nitrate Nonlinear Optical Material Bi₃TeO₆OH(NO₃)₂

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• 作者：Dr. Sangen Zhao ; Yi Yang ; Yaoguo Shen ; Bingqing Zhao ; Lina Li ; Chengmin Ji ; Zhenyue Wu ; Prof. Daqiang Yuan ; Prof. Zheshuai Lin ; Prof. Maochun Hong and Prof. Junhua Luo
• 刊名：Angewandte Chemie International Edition
• 出版年：2017
• 出版时间：January 9, 2017
• 年：2017
• 卷：56
• 期：2
• 页码：540-544
• 全文大小：1375K
• ISSN：1521-3773

文摘

Nitrates have long been ignored for practical uses as nonlinear optical (NLO) materials because they are usually very easy to dissolve in water; despite this, the π-conjugated [NO₃]⁻ is among the most desirable NLO-active structural units. The cooperation of three structural chromophores, namely, Bi₃O₆OH short chains with 6s² lone pair electrons, distorted TeO₆ octahedra with d¹⁰ electrons, and π-conjugated [NO₃]⁻ triangles, generates a new nitrate NLO material, Bi₃TeO₆OH(NO₃)₂, which exhibits an enhanced phase-matchable NLO response of three times that of KH₂PO₄ (3×KH₂PO₄), exceeding those of most nitrate NLO materials. Remarkably, the new material did not show obvious weight loss and degeneration of NLO response after being dipped in de-ionized water for 24 h, indicating that it is highly resistant to water. Theoretical calculations reveal that foreign water molecules cannot stably stay in the crystal lattice of Bi₃TeO₆OH(NO₃)₂. These findings highlight the introduction of diverse chromophores into the nitrate systems as an effective approach for developing practical nitrate NLO materials that are of high water-resistance and good optical performance.