K2Sb(P2O7)F: Cairo Pentagonal Layer with Bifunctional Genes Reveal Optical Performance

• Published in: Angewandte Chemie International Edition Vol. 59; no. 47; pp. 21151 - 21156
• Main Authors: Deng, Yalan, Huang, Ling, Dong, Xuehua, Wang, Lei, Ok, Kang Min, Zeng, Hongmei, Lin, Zhien, Zou, Guohong
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 16-11-2020
• Edition: International ed. in English
• Subjects: Antimony; Birefringence; Crystal structure; Genes; Harmonic generations; Inorganic compounds; materials science; nonlinear optics; Optical materials; Optical properties; Optics; structure elucidation; Tiling
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.202009441

Discovering new functional genes, designing perfect crystal structures, and developing high‐performance materials are the goals being pursued by scientists. Herein, the first antimony pyrophosphate, K2Sb(P2O7)F, possessing an optimal layered structure, is reported, where the perfect structural arrangement induces excellent optical properties. K2Sb(P2O7)F not only displays a sharply enhanced birefringence (0.157@546 nm) compared to the existing phosphate optical materials, but also exhibits a strong second‐harmonic generation response (4.0×KDP). Remarkably, a new bifunctional gene, the square‐pyramidal SbO4F group, was discovered, and a unique two‐dimensional arrangement of Cairo pentagonal tiling units was observed in inorganic compounds for the first time.
The first antimony pyrophosphate, K2Sb(P2O7)F, with an unprecedented Cairo pentagonal layered structure, not only exhibits a strong second‐harmonic generation response (4.0×KH2PO4), but also displays the second largest birefringence (0.157@546 nm) among all phosphate optical materials.