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<p>In order to maximize performance, birefringent crystals—essential components in laser technology, optical communication, and photonic devices—need to have their optical anisotropy precisely controlled. By combining two <i>π</i>-conjugated organic groups of [C<sub>5</sub>H<sub>7</sub>N<sub>2</sub>]<sup>+</sup> cation and [C<sub>4</sub>H<sub>3</sub>N<sub>2</sub>O<sub>3</sub>]<sup>−</sup> anion in a synergistic manner, this study successfully constructs a novel metal-free molecule (C<sub>5</sub>H<sub>7</sub>N<sub>2</sub>)-(C<sub>4</sub>H<sub>3</sub>N<sub>2</sub>O<sub>3</sub>)·H<sub>2</sub>O using a collaborative design technique based on large anisotropic polar units. According to structural research, the compound’s remarkable birefringence (0.507@546 nm) breaks the record for dual six-membered ring systems. This is due to the highly coplanar alignment that these two planar six-membered ring groups acquire through hydrogen bonding interaction. This study offers a novel design paradigm for creating high-performance, environmentally friendly birefringent materials in addition to empirically verifying the viability of increasing optical anisotropy through the synergistic effects of several π-conjugated units.</p>

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A novel metal-free crystal demonstrating superior birefringence attributed to the synergistic interaction of dual π-conjugated units

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Die-Xue Yang,
  • Ru-Ling Tang,
  • Yi-Lei Lv,
  • Bing-Wei Miao,
  • Wenlong Liu,
  • Sheng-Ping Guo

摘要

In order to maximize performance, birefringent crystals—essential components in laser technology, optical communication, and photonic devices—need to have their optical anisotropy precisely controlled. By combining two π-conjugated organic groups of [C5H7N2]+ cation and [C4H3N2O3]− anion in a synergistic manner, this study successfully constructs a novel metal-free molecule (C5H7N2)-(C4H3N2O3)·H2O using a collaborative design technique based on large anisotropic polar units. According to structural research, the compound’s remarkable birefringence (0.507@546 nm) breaks the record for dual six-membered ring systems. This is due to the highly coplanar alignment that these two planar six-membered ring groups acquire through hydrogen bonding interaction. This study offers a novel design paradigm for creating high-performance, environmentally friendly birefringent materials in addition to empirically verifying the viability of increasing optical anisotropy through the synergistic effects of several π-conjugated units.