Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 47, Pages 24901-24904Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202111604
Keywords
birefringent materials; optical anisotropy; phosphates; stereochemically active lone pair; tin (II)-based materials
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Funding
- National Natural Science Foundation of China [52172012]
- West Light Foundation of CAS [2019-YDYLTD-002]
- Science and Technology Service Network Initiative of CAS [KFJ-STS-QYZD-130]
- International Partnership Program of CAS [1A1365KYSB20200008]
- Instrument Developing Project of CAS [GJJSTD20200007]
- Key Research Program of Frontier Sciences, CAS [ZDBS-LY-SLH035]
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This study successfully synthesized two new compounds with large birefringence, especially Sn2PO4I, showing greater birefringence than other borates and phosphates, even surpassing commercial crystals. This breakthrough in inorganic compound birefringence provides a new direction for future exploration of materials with high birefringence.
Exploring non pi-conjugated phosphate birefringent crystal with a large birefringence has been a great challenge. Herein, based on the unique two-dimensional layered structure in KBe2BO3F2 (KBBF), two new compounds, Sn2PO4I and Sn2BO3I, were designed and synthesized successfully, maintaining the layer structural feature and enhancing the optical anisotropy of crystals. In particular, the birefringence of Sn2PO4I is larger than or equal to 0.664 @546 nm, which is largest among the reported borates and phosphates, even surpassing commercial birefringent crystals YVO4 and TiO2. This work indicates that a breakthrough in birefringence of inorganic compound was achieved. Also, it provides a guiding idea for exploring large birefringence materials in the future.
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