Cai Ding-Gui, Qiu Cheng-Qiang, Zhu Zi-Hao, Zheng Teng-Fei, Wei Wen-Juan, Chen Jing-Lin, Liu Sui-Jun, Wen He-Rui
School of Chemistry and Chemical Engineering, Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, P. R. China.
Inorg Chem. 2022 Sep 19;61(37):14770-14777. doi: 10.1021/acs.inorgchem.2c02195. Epub 2022 Sep 7.
Due to their important role in biological systems, it is urgent to develop a material that can rapidly and sensitively detect the concentration of Fe and Al ions. In this work, a brand-new Cd-based metal-organic framework [Cd(BTBD)(AIC)] (, BTBD = 4,7-bis(1-1,2,4-triazol-1-yl)-2,1,3-benzothiadiazole and HAIC = 5-aminoisophthalic acid) with a 4-connected topology was designed and synthesized. The symmetrical Cd centers are linked by AIC ligands with μ-η:η:η:η coordination mode to form a [Cd(COO)] secondary building unit (SBU). The contiguous SBUs are further connected by BTBD ligands to form a two-dimensional (2D) layer structure. can remain stable in aqueous solutions with pH values of 3-12 or in boiling water. Luminescent experiments suggest that displays more than eightfold fluorescence enhancement in the presence of Fe and Al ions, and the detection limits for Fe and Al ions are 0.196 and 0.184 μM, respectively. Furthermore, the change in luminescence color is uncomplicatedly distinguishable with the naked eye under ultraviolet light at 365 nm. In addition, a series of devices based on including fluorescence test strips, lamp beads, and composite films were developed to detect metal ions visual changes in luminescence color. Significantly, is a rare MOF-based turn-on fluorescence sensor for the detection of Fe ions. The theoretical calculation suggests that the complexation of Fe/Al ions and the -NH group contributes to fluorescence enhancement.
由于它们在生物系统中的重要作用，开发一种能够快速、灵敏地检测铁离子和铝离子浓度的材料迫在眉睫。在这项工作中，设计并合成了一种具有4连接拓扑结构的全新镉基金属有机框架[Cd(BTBD)(AIC)]（BTBD = 4,7-双(1-1,2,4-三唑-1-基)-2,1,3-苯并噻二唑，HAIC = 5-氨基间苯二甲酸）。对称的镉中心通过AIC配体以μ-η:η:η:η配位模式连接，形成[Cd(COO)]二级建筑单元（SBU）。相邻的SBUs通过BTBD配体进一步连接，形成二维（2D）层状结构。[Cd(BTBD)(AIC)]在pH值为3至12的水溶液或沸水中都能保持稳定。发光实验表明，[Cd(BTBD)(AIC)]在铁离子和铝离子存在下荧光增强超过八倍，铁离子和铝离子的检测限分别为0.196和0.184 μM。此外，在365 nm紫外光下，发光颜色的变化用肉眼即可轻松区分。此外，还开发了一系列基于[Cd(BTBD)(AIC)]的器件，包括荧光测试条、灯珠和复合膜，用于通过发光颜色的视觉变化检测金属离子。值得注意的是，[Cd(BTBD)(AIC)]是一种罕见的基于金属有机框架的开启型荧光传感器，用于检测铁离子。理论计算表明，铁/铝离子与-NH基团的络合有助于荧光增强。
