摘要
在溶剂热条件下,利用2,5-二溴对苯二甲酸与六水合硝酸铕合成得到一例新型稀土金属有机框架材料Eu(DBTA)_(1.5)(DEA)(H_(2)O)(H_(2)DBTA=2,5-二溴对苯二甲酸;DEA=N,N-二乙基乙酰胺),对其进行红外、热重、粉末衍射和光致发光等手段表征。晶体结构分析表明,Eu^(3+)处于八配位的四方反棱柱中心,通过不同2,5-二溴对苯二甲酸根的桥联作用,形成二维层状结构。该MOF作为荧光探针对UO_(2)^(2+)离子具有高选择性和灵敏性的检测能力,其检出限为6.2×10^(-5)mol/L。此外,通过PXRD、紫外光谱等手段系统地研究了响应过程中的荧光猝灭机制。
A new rare earth metal-organic framework Eu(DBTA)_(1.5)(DEA)(H_(2)O)(H_(2)DBTA=2,5-dibromoterephthalic acid;DEA=N,N-diethylacetamide)was synthesized by using 2,5-dibromoterephthalic acid and europium nitrate hexahydrate under solvothermal method,and characterized by infrared spectroscopy,thermogravimetric analysis,powder X-ray diffraction and photoluminescence spectroscopy.Crystal structure analysis revealed that Eu^(3+)was in the center of a distorted square antiprism,and two-dimensional layer structure was formed by the bridging interaction of different 2,5-dibromoterephthalic acid moieties.This MOF exhibited high selectivity and sensitivity for UO_(2)^(2+)ions detection as a fluorescent probe with a detection limit of 6.2×10^(-5)mol/L.In addition,the fluorescence quenching mechanism in the response process was systematically investigated by PXRD and UV spectroscopy.
作者
张涨展
ZHANG Zhang-zhan(Ningbo Petrochemical Development Zone Thermal Power Co.,Ltd.,Ningbo 315200,China)
出处
《化学试剂》
CAS
北大核心
2023年第9期70-75,共6页
Chemical Reagents
关键词
2
5-二溴对苯二甲酸
稀土金属有机框架
荧光探针
铀酰离子
荧光猝灭
2,5-dibromide-terephthalic acid
rare earth metal-organic framework
fluorescent probe
uranyl ions
fluorescence quenching
