Li Yu, Cai Ding-Gui, Zhu Zi-Hao, Xu Hui, Zheng Teng-Fei, 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 Province, P. R. China.
Dalton Trans. 2023 Mar 28;52(13):4167-4175. doi: 10.1039/d2dt03230a.
A novel three-dimensional Eu-based metal-organic framework with the formula {[(CH)NH][Eu(BTDI)]·HO·DMF} (JXUST-25) was prepared by solvothermal method based on Eu and 5,5'-(benzothiadiazole-4,7-diyl)diisophthalic acid (HBTDI) with benzothiadiazole (BTD) luminescent groups. Due to the presence of Eu and organic fluorescence ligand, JXUST-25 displays turn-on and blue-shift fluorescence toward Cr, Al and Ga with limits of detection (LOD) of 0.073, 0.006 and 0.030 ppm, respectively. Interestingly, the alkaline environment can change the fluorescence of JXUST-25 toward Cr/Al/Ga and the addition of HCl solution realizes the reversible change of the fluorescence of JXUST-25 toward Cr/Al/Ga. It is noteworthy that the fluorescent test paper and light-emitting diode lamp based on JXUST-25 can effectively detect Cr, Al and Ga by the visual changes. In addition, the turn-on and blue-shift fluorescence between JXUST-25 and M ions may be caused by the host-guest interaction and the absorbance caused enhancement mechanism.
基于铕（Eu）和5,5'-（苯并噻二唑-4,7-二基）二间苯二甲酸（HBTDI），通过溶剂热法制备了一种新型三维铕基金属有机框架{[(CH)NH][Eu(BTDI)]·HO·DMF}（JXUST-25），其含有苯并噻二唑（BTD）发光基团。由于铕和有机荧光配体的存在，JXUST-25对Cr、Al和Ga呈现出开启型和蓝移荧光，检测限（LOD）分别为0.073、0.006和0.030 ppm。有趣的是，碱性环境会改变JXUST-25对Cr/Al/Ga的荧光，加入盐酸溶液可实现JXUST-25对Cr/Al/Ga荧光的可逆变化。值得注意的是，基于JXUST-25的荧光试纸和发光二极管灯可通过视觉变化有效检测Cr、Al和Ga。此外，JXUST-25与M离子之间的开启型和蓝移荧光可能是由主客体相互作用和吸光度引起的增强机制导致的。
