Ju Ping, Zhang Ensheng, Jiang Long, Zhang Ze, Hou Xiangyang, Zhang Yuqi, Yang Hua, Wang Jijiang
Laboratory of New Energy & New Function Materials, Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University Yan'an Shaanxi 716000 P. R. China
MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University Guangzhou 510275 P. R. China.
RSC Adv. 2018 Jun 13;8(39):21671-21678. doi: 10.1039/c8ra02602e.
A new three-dimensional metal-organic framework (MOF) sensor with molecular formula (CHNH)[Tb(ptptc)(DMF)(HO)]·DMF·6HO (complex 1) has been constructed from terphenyl-3,3',5,5'-tetracarboxylic acid (Hptptc) and terbium nitrate under solvothermal conditions. The structure of complex 1 was characterized by single-crystal X-ray diffraction analysis (XRD), elemental analysis, IR spectroscopy and thermogravimetric (TG) analysis, and the purity was further confirmed by powder X-ray diffraction (PXRD) analysis. XRD analysis reveals that complex 1 crystallizes in a triclinic system 1̄ space group and consists of a three-dimensional anionic network which has one-dimensional channels. Fluorescence titration experiments showed that complex 1 displayed real-time, highly selective and sensitive fluorescence quenching behavior towards picric acid with a nanomolar scale experimental detection limit (100 nM). Recycling titration experiments suggested that the as-synthesized probe has good reversibility and can be used for at least five cycles in fluorescence titration experiments without obvious fluorescence intensity reduction or framework structure destruction. Furthermore, the high selectivity and sensitivity as well as good recyclability of complex 1 make it a potential fluorescent sensor for picric acid.
一种分子式为(CHNH)[Tb(ptptc)(DMF)(HO)]·DMF·6HO的新型三维金属有机框架（MOF）传感器（配合物1），在溶剂热条件下由三联苯-3,3',5,5'-四羧酸（Hptptc）和硝酸铽构建而成。通过单晶X射线衍射分析（XRD）、元素分析、红外光谱和热重（TG）分析对配合物1的结构进行了表征，并通过粉末X射线衍射（PXRD）分析进一步确认了其纯度。XRD分析表明，配合物1结晶于三斜晶系1̄空间群，由具有一维通道的三维阴离子网络组成。荧光滴定实验表明，配合物1对苦味酸表现出实时、高选择性和灵敏的荧光猝灭行为，实验检测限为纳摩尔级（100 nM）。循环滴定实验表明，所合成的探针具有良好的可逆性，在荧光滴定实验中可至少使用五个循环，而荧光强度无明显降低或框架结构破坏。此外，配合物1的高选择性、高灵敏度以及良好的可循环性使其成为一种潜在的苦味酸荧光传感器。
