Recent Development of Sn<sup>II</sup>, Sb<sup>III</sup>‐based Birefringent Material: Crystal Chemistry and Investigation of Birefringence
Shujuan Han, Abudukadi Tudi, Wenbin Zhang, Xueling Hou, Zhihua Yang, Shilie Pan
Abstract
Abstract The combination of Sn II or Sb III with π, non‐π‐conjugated units has produced birefringent crystals with birefringence ranging from 0.005 to 0.468@1064 nm. It is proven that introducing Sn II or Sb III into crystals is a feasible strategy to enlarge the birefringence, which not only promotes the miniaturization of fabricated devices, but also effectively modulates polarized light. Herein, recently discovered Sn II , Sb III ‐based birefringent crystals with birefringence investigated are summarized, including their crystal structure and optical properties, especially birefringence. This review also presents the influence of Sn II , Sb III with stereochemically active lone pair on the optical anisotropy. We hope that this work provides a clear perspective on the crystal chemistry of Sn II , Sb III ‐based optical functional crystals and promotes the development of new birefringent crystals with large optical anisotropy.