Liu Wen, Cui Hua-Li, Zhou Jie, Su Zi-Tong, Zhang You-Zhen, Chen Xiao-Li, Yue Er-Lin
Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University, Yan'an 716000, P. R. China.
ACS Omega. 2023 Jun 28;8(27):24635-24643. doi: 10.1021/acsomega.3c03073. eCollection 2023 Jul 11.
A Cd-based metal-organic framework (Cd-MOF), named after {[Cd(ttc)(HO)]·HO} (ttc = 1-imidazole-1-yl-2,4,6-benzene-tricarboxylic acid), was synthesized using the solvothermal reaction. The single-crystal structure was determined by single X-ray diffraction analysis, and crystalline characteristics and composition were confirmed by powder X-ray diffraction (PXRD) and thermogravimetric analysis (TG), respectively. Structural analysis showed that the Cd ion is in the seven-coordinated mode, in which ttc ion adopts the μ-η-η-η-η coordination mode. It is worth noting that the Cd ion is connected to ttc to form a 2D network, and the adjacent 2D network is expanded into a 3D supramolecular network structure through weak hydrogen bonds. The fluorescence sensing experiments indicated that Cd-MOF could not only be used as a fluorescence sensor for Fe, fluazinam (FLU), and 2,4,6-trinitrophenolol (TNP) but also for sulfasalazine detection in aqueous solution. To verify the sensitivity of the fluorescent probe, we calculated its detection limit: 5.34 × 10 M (Fe), 7.8 × 10 M (FLU), 1.21 × 10 M (TNP), and 2.67 × 10 M (SECT). In addition, the quenching mechanism was thoroughly studied.
一种基于镉的金属有机框架材料（Cd-MOF），其化学式为{[Cd(ttc)(HO)]·HO}（ttc = 1-咪唑-1-基-2,4,6-苯三甲酸），通过溶剂热反应合成。通过单晶X射线衍射分析确定了其单晶结构，并分别通过粉末X射线衍射（PXRD）和热重分析（TG）确认了晶体特征和组成。结构分析表明，镉离子处于七配位模式，其中ttc离子采用μ-η-η-η-η配位模式。值得注意的是，镉离子与ttc相连形成二维网络，相邻的二维网络通过弱氢键扩展为三维超分子网络结构。荧光传感实验表明，Cd-MOF不仅可以用作检测铁、氟唑菌酰胺（FLU）和2,4,6-三硝基苯酚（TNP）的荧光传感器，还可以用于水溶液中柳氮磺胺吡啶的检测。为了验证荧光探针的灵敏度，我们计算了其检测限：5.34×10 M（铁）, 7.8×10 M（FLU）, 1.21×10 M（TNP）和2.67×10 M（柳氮磺胺吡啶）。此外，还深入研究了猝灭机制。
