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[Cs_(6)Cl][Ga_(5)GeQ_(12)](Q=S,Se):two novel porous layered chalcohalides exhibiting two-band emission and ion exchange properties

查看全文 作　　者：Ruiqi [1]Wang;Xian [2]Zhang;Fuqiang [1,3]Huang 高影响力作者 机构地区：[1]Beijing National Laboratory for Molecular Sciences,State Key Laboratory of Rare Earth Materials Chemistry and Applications,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China;[2]Qian Xuesen Laboratory of Space Technology,China Academy of Space Technology,Beijing 100094,China;[3]State Key Laboratory of High-Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China高影响力机构 出　　处：《Science China Chemistry》索引2022年第65卷第10期,共8页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (22005006,21871008,22001263);the China Postdoctoral Science Foundation (2019M660298,2020T130009) 摘　　要：The salt-inclusion materials have drawn significant attention for their manifold structural chemistry and novel physical/chemical properties.Herein,two new salt-inclusion chalcohalides,[Cs_(6)Cl][Ga_(5)GeQ_(12)](Q=S,Se),have been discovered via hightemperature flux methods.The two isostructural compounds are constructed by porous[Ga_(5)GeQ_(12)]^(5−)layers with[ClCs_(6)]^(5+)octahedra filled in the holes.The[Ga_(5)GeQ_(12)]^(5−)layer is composed of the honeycomb-like(Ga/Ge)_(18)Q_(42)rings containing(Ga/Ge)_(3)Q_(9)trimer as basic unit.The band gaps of the two compounds are 3.90 and 2.89 eV,respectively.[Cs_(6)Cl][Ga_(5)GeS_(12)]exhibits interesting two-band emission properties which are related to the intermediate-band electronic structure revealed by density functional theory(DFT)calculations.Owing to the porous layered structure,[Cs_(6)Cl][Ga_(5)GeS_(12)]exhibits topological ion exchange ability towards Cd^(2+)ions with the maximum sorption capacity of 250 mg/g and high distribution coefficient(Kd)near 106 mL/g.This work further enriches the structural diversity of salt-inclusion materials and extends their potential application range to ion exchange adsorption. 关 键 词：heteroanionic compound layered structure two-band emission ion exchange properties
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