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Updated: May 13, 2026

Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand
Published on: September 8, 2016
K2SO4(NH3SO3)2 and Cs2SO4(NH3SO3)3: two deep-UV transparent sulfamate-sulfates with moderate birefringence
Yun Ji1, Huili Zhang1, Xin Wen2
1State Key Laboratory of Crystal Materials, Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystal, Tianjin University of Technology, Tianjin 300384, China. gpeng@email.tjut.edu.cn.
Abstract:
In this work, polar tetrahedral [NH3SO3] and non-polar tetrahedral [SO4]2- groups were combined to synthesize two deep-UV transparent crystals K2SO4(NH3SO3)2 and Cs2SO4(NH3SO3)3 based on the solution evaporation method. Due to the presence of two types of tetrahedral groups with wide bandgap and alkali metal cations without d-d or f-f transitions, both crystals exhibit a deep-UV cutoff edge, approximately 190 nm. Significantly, the birefringence values of K2SO4(NH3SO3)2 and Cs2SO4(NH3SO3)3 are 0.0123 and 0.0153 @546 nm, respectively, which are remarkably improved compared to those of many conventional sulfate crystals. In addition, theoretical calculations were performed to analyze the relationships between the structures and optical properties.
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