DL-Serine covalently modified multinuclear lanthanide-implanted arsenotungstates with fast photochromism  

作　　者：Kangting Zheng Bingxue Niu Cunmeng Lin Yizhen Song Pengtao Ma Jingping Wang Jingyang Niu 

机构地区：[1]Henan Key Laboratory of Polyoxometalate Chemistry,College of Chemistry and Chemical Engineering,Henan University,Kaifeng 475004,China

出　　处：《Chinese Chemical Letters》2023年第2期572-575,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.222071043);the Major Project of Science and Technology,Education Department of Henan Province(No.20A150010);the 2021 Students Innovative Pilot Plan of Henan University(No.202110475079)。

摘　　要：A series of DL-serine covalently modified multinuclear lanthanide implanted arsenotungstates K_(2)[{Ln(H_(2)O)_(7)}_(2){As_(4)W_(44)O_(137)(OH)_(18)(H_(2)O)_(2)(DL-Ser)_(2)}{Ln_(2)(H_(2)O)_(5)(DL-Ser)}_(2)]·65H_(2)O(DL-Ser=DL-serine,Ln=La(1),Ce(2),Pr(3))are obtained.Crystal structure analysis shows that these compounds are isomorphic and contain the basic[{As_(4)W_(44)O_(137)(OH)_(18)(H_(2)O)_(2)(DL-Ser)_(2)}{Ln_(2)(H_(2)O)_(5)(DL-Ser)}_(2)]^(8–)polyoxoanion constituted by two{As_(2)W_(19)O_(59)(OH)_(8)(H_(2)O)}^(6–)subunits,a[W_(6)O_(2)_(3)(OH)_(2)(DL-Ser)_(2)]_(14)–fragment,and two embedded[Ln_(2)(H_(2)O)_(5)(DL-Ser)]^(5+)groups,which further build into one dimensional linear chainlike structure via two peripheral Ln^(3+)ions.Most remarkably,these compounds exhibit rapid photochromic behaviors,which changed color quickly from white(1),yellow(2),green(3)to blue(1),brown(2)and glaucous(3)in ten minutes under UV irradiation,and that the colors gradually recovered in the dark for approximately 22 h.

关 键 词：Polyoxometalate ARSENOTUNGSTATE Carboxylate covalently modified LANTHANIDE PHOTOCHROMISM 

分 类 号：O641.4[理学—物理化学] TB383.1[理学—化学]