A multi-responsive luminescent sensor based on a stable Eu(iii) metal–organic framework for sensing Fe3+, MnO4−, and Cr2O72− in aqueous solutions

• Published in: CrystEngComm Vol. 24; no. 5; pp. 1041 - 1048
• Main Authors: Qi-Qi, He, Shu-Li, Yao, Teng-Fei, Zheng, Xu, Hui, Sui-Jun, Liu, Jing-Lin, Chen, Li, Na, He-Rui, Wen
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 01.01.2022
• Subjects: Aqueous solutions; Dicarboxylic acids; Dimensional stability; Fluorescence; Metal-organic frameworks
• ISSN: 1466-8033
• DOI: 10.1039/d1ce01503f

A new water-stable three-dimensional (3D) Eu(iii) metal–organic framework with the formula of {[Eu3(BTDC)4(HCOO)(H2O)2]·solvents}n (JXUST-9) was successfully obtained by the solvothermal reaction of 2,1,3-benzothiadiazole-4,7-dicarboxylic acid (H2BTDC) and Eu(NO3)3·6H2O. The PXRD patterns indicate that JXUST-9 exhibits good stability when soaked in boiling water for at least 24 h. The fluorescence experiments indicate that JXUST-9 could be considered as a good multi-responsive sensing material for detecting Fe3+, MnO4− and Cr2O72− in aqueous solutions via the turn-off effect, and the detection limits are 0.94 μM, 1.23 μM and 1.23 μM, respectively. JXUST-9 can also be regenerated at least five times for sensing Fe3+, MnO4− and Cr2O72−. Moreover, a rapid detection test paper incorporated with JXUST-9 has been produced, which is helpful for carrying out visual detection of Fe3+, MnO4− and Cr2O72− in daily applications.