Noncentrosymmetric K2Mn3(SO4)3F2·4H2O and Rb2Mn3(SO4)3F2·2H2O with pseudo-KTP structures

• Published in: Chinese chemical letters Vol. 32; no. 1; pp. 263 - 265
• Main Authors: Zhou, Yang, Li, Yanqiang, Ding, Qingran, Liu, Youchao, Chen, Yangxin, Liu, Xitao, Huang, Xiaoying, Li, Lina, Zhao, Sangen, Luo, Junhua
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-01-2021; College of Chemistry and Materials Science,Fujian Normal University,Fuzhou 350007,China%State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China%State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China; Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China
• Subjects: Crystal structure; Second harmonic generation; Sulfate; Thermogravimetric analysis; X-ray diffraction; X-ray diffraction; Second harmonic generation; Sulfate; Thermogravimetric analysis; Crystal structure
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2020.11.014

Two new non-centrosymmtric fluoride sulfates nonlinear optical materials with pseudo-KTP structure were successfully obtained by element substitution.
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Two fluoride sulfates, K2Mn3(SO4)3F2·4H2O (I) and Rb2Mn3(SO4)3F2·2H2O (Π) are obtained by water solution method. Single-crystal X-ray diffraction analysis indicated that they crystallize in space groups of Cmc21. Their structures feature a pseudo-KTP structure consisting of interconnecting [Mn3(SO4)3F2(H2O)2]∞ layers, which are further packing along the a axis with alkali metal cations balancing the charges. The structure relationships between the two compounds are discussed. Second-harmonic generation measurements manifest that I and Π have similar second-harmonic generation responses of about 0.2 and 0.25 times that of KH2PO4.