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

IF 7.4 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2025-07-07 DOI:10.1007/s40843-025-3443-1

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

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引用次数: 0

Abstract

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.

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一种新型无金属晶体，由于双π共轭单元的协同作用而具有优越的双折射性能

为了最大限度地提高性能，双折射晶体——激光技术、光通信和光子器件的重要组成部分——需要精确控制其光学各向异性。本研究利用基于大各向异性极性单元的协同设计技术，将[C5H7N2]+阳离子和[C4H3N2O3]−阴离子两个π共轭有机基团协同结合，成功构建了新型无金属分子(C5H7N2)-(C4H3N2O3)·H2O。根据结构研究，该化合物显著的双折射（0.507@546 nm）打破了双六元环系统的记录。这是由于这两个平面六元环基团通过氢键相互作用获得的高度共面排列。本研究为创造高性能、环保的双折射材料提供了一种新的设计范式，并通过经验验证了通过几个π共轭单元的协同效应增加光学各向异性的可行性。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.