Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 49, Pages 17675-17678Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201911187
Keywords
birefringent materials; solid-state synthesis; stereochemical activity lone pair; tin borate chloride
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Funding
- Xinjiang Outstanding Young Scientific and Technological Talents [2018Q004]
- National Natural Science Foundation of China [U1703127, 61835014, 51425206, 11774414]
- National Key Research Project [2016YFB0402104]
- Fujian Institute of Innovation, Chinese Academy of Sciences
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The excellent birefringent materials are needed for optical systems. Herein, we reported a new compound, the first tin borate chloride, Sn2B5O9Cl (SBOC) with a large birefringence (0.168 at 546nm) measured by the polarizing microscope. Its birefringence is 16times that of the isostructural Ba2B5O9Cl (BBOC) compound (0.010@ at 546nm). The results show that the birefringence enhancement originates mainly from the Sn2+ polyhedra. We propose that the birefringence can be enlarged by substituting the alkaline-earth metal cation by the Sn2+ cation in the isostructural borate with small birefringence. This strategy will guide the discovery of large birefringent materials in the future.
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