(C3N2H5)B3O3F2(OH)2:通过阴离子 F/OH 比率优化和阳离子活化之间的协同效应实现大双折射

Chenhui Hu, Chunjie Shen, Huan Zhou, Jian Han, Zhihua Yang, Kenneth R. Poeppelmeier, Feng Zhang, Shilie Pan
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引用次数: 0

摘要

硼酸盐已成为探索紫外频率区域双折射材料的重要资源。π共轭平面阴离子,如[BO3]、[B2O5]和[B3O6]单元,表现出很强的偏振各向异性,是传统上很好的结构模型。氟化和羟基化已被证明是调节平面阴离子光学性质的有效策略。控制 F 和 OH 之间的比例是实现双折射和带隙之间性能平衡的关键。根据最近提出的氟化机制,我们合成了一种新型羟氟氧硼酸盐 (C3N2H5)B3O3F2(OH)2,其最佳 F/OH 比例为 1/1。在合成过程中,还采用了另一种称为 "阳离子活化 "的策略,通过引入活性阳离子单元进一步提高了双折射性。该化合物性能优越,在 214 纳米波长处具有较短的紫外截止边,在 546 纳米波长处具有 0.205 的大幅双折射,超过了商用双折射晶体 α-BBO(0.122@532 纳米波长)。F/OH 比率优化和阳离子活化之间的协同作用为开发紫外双折射材料提供了一种实用的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

(C3N2H5)B3O3F2(OH)2: Realizing Large Birefringence via a Synergistic Effect between Anion F/OH-Ratio Optimization and Cation Activation

(C3N2H5)B3O3F2(OH)2: Realizing Large Birefringence via a Synergistic Effect between Anion F/OH-Ratio Optimization and Cation Activation
Borates have emerged as a significant resource for exploring birefringent materials in the UV frequency region. The π-conjugated planar anions, such as the [BO3], [B2O5], and [B3O6] units, exhibiting strong polarizability anisotropy, are traditionally good structural models. Both fluorination and hydroxylation have been proven effective strategies to modulate the optical properties of the planar anions. Controlling the ratio between F and OH is the key to realizing a balanced performance between birefringence and bandgap. Based on a fluorination mechanism proposed recently, a novel hydroxyfluorooxoborate (C3N2H5)B3O3F2(OH)2 with an optimal F/OH ratio of 1/1 is synthesized. During the synthesis, another strategy known as “cation activation” is also employed, which further increases birefringence by introducing active cation units. With its superior performance, this compound exhibits a short UV cutoff edge at 214 nm and a substantial birefringence of 0.205 at 546 nm, surpassing the commercial birefringent crystal α-BBO (0.122@532 nm). The synergy between F/OH-ratio optimization and cation activation offers a practical methodology for developing UV birefringent materials.
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CiteScore
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