Uranyl oxamate hydrates: hydrothermal synthesis, crystal structure, photophysical properties, and selective crystallization  

作　　者：Yubo Shu Weisheng Liu 

机构地区：[1]College of Chemistry and Chemical Engineering, Lanzhou University [2]School of Chemical and Biological Engineering, Hechi University

出　　处：《Science China Chemistry》2016年第6期740-745,共6页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China (21431002);the Specialized Research Fund for the Doctoral Program of Higher Education (20110211130002)

摘　　要：Presented here are two isostructural uranyl coordination polymers [UOe（EDO）（H2O）]· H2O （1） and [UO2（BDO）（H2O）]-2H2O （2） （EDO2---ethylene-1,2-dioxamate; BDO2 =butylene-1,2-dioxamate） with identical stepwise zigzag chain structure and distinct interchain hydrogen bonding interaction, prepared from hydrothermal reaction of DEEDO or DEBDO （DEEDO- diethyl ethylene-1,2-dioxamate; DEBDO--diethyl butylene-l,2-dioxamate） with uranyl ions. The monomeric uranyl-based fluorescence emissions of compounds 1 and 2 are red-shifted by about 6 and 5 nm respectively, compared to that of uranyl nitrate hexahydrate. Compound 1 has stronger emission than compound 2, but both their emissions exhibit triple-exponential decay. The photophysics of uranyl oxalate trihydrate was also investigated for comparison. The selective crystallization of compound 1 in alkaline solution was applied to the sequestration of uranyl ions, showing a kinetic preference.Presented here are two isostructural uranyl coordination polymers [UO_2(EDO)(H_2O)]?H_2O(1) and [UO_2(BDO)(H_2O)]?2H2_O(2)(EDO^(2-)=ethylene-1,2-dioxamate; BDO^(2-)=butylene-1,2-dioxamate) with identical stepwise zigzag chain structure and distinct interchain hydrogen bonding interaction, prepared from hydrothermal reaction of DEEDO or DEBDO(DEEDO= diethyl ethylene-1,2-dioxamate; DEBDO=diethyl butylene-1,2-dioxamate) with uranyl ions. The monomeric uranyl-based fluorescence emissions of compounds 1 and 2 are red-shifted by about 6 and 5 nm respectively, compared to that of uranyl nitrate hexahydrate. Compound 1 has stronger emission than compound 2, but both their emissions exhibit triple-exponential decay. The photophysics of uranyl oxalate trihydrate was also investigated for comparison. The selective crystallization of compound 1 in alkaline solution was applied to the sequestration of uranyl ions, showing a kinetic preference.

关 键 词：uranium oxamate hydrothermal synthesis PHOTOPHYSICS selective crystallization 

分 类 号：O627.6[理学—有机化学]