A pH-Stable TbIII-Based Metal-Organic Framework as a Turn-On and Blue-Shift Fluorescence Sensor toward Benzaldehyde and Salicylaldehyde in Aqueous Solution

Ke Wang; Teng-Fei Zheng; Jing-Lin Chen; He-Rui Wen; Sui-Jun Liu; Tong-Liang Hu

doi:10.1021/acs.inorgchem.2c02763

A pH-Stable Tb^III-Based Metal-Organic Framework as a Turn-On and Blue-Shift Fluorescence Sensor toward Benzaldehyde and Salicylaldehyde in Aqueous Solution

Inorg Chem. 2022 Oct 10;61(40):16177-16184. doi: 10.1021/acs.inorgchem.2c02763. Epub 2022 Sep 23.

Authors

Ke Wang¹, Teng-Fei Zheng¹, Jing-Lin Chen¹, He-Rui Wen¹, Sui-Jun Liu¹, Tong-Liang Hu²

Affiliations

¹ School of Chemistry and Chemical Engineering, Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, Ganzhou341000, Jiangxi Province, P. R. China.
² School of Materials Science and Engineering, Nankai University, Tianjin300350, P. R. China.

PMID: 36149649
DOI: 10.1021/acs.inorgchem.2c02763

Abstract

A new polydentate tetracarboxylic acid with a benzothiadiazole unit (4',4'''-(benzo[c][1,2,5]thiadiazole-4,7-diyl)bis([1,1'-biphenyl]-3,5-dicarboxylic acid), H₄BTDBA) has been used to prepare a pH-stable three-dimensional Tb^III-based metal-organic framework (MOF) with the formula {[(CH₃)₂NH₂]_0.7[Tb₂(BTDBA)_1.5(lac)_0.7(H₂O)₂]·solvents}_n (Hlac = lactic acid, JXUST-19). JXUST-19 exhibits a new (4,4,12)-connected topology based on tetranuclear [Tb₄] clusters. JXUST-19 can remain stable when soaked in water for at least 1 week and in aqueous solutions with various pH values (2-12) for 24 h. Fluorescence study indicates JXUST-19 can be employed as a rare turn-on and blue-shift MOF sensor toward benzaldehyde (BZ) and salicylaldehyde (SA). To date, JXUST-19 represents the first Tb^III-based turn-on MOF sensor toward salicylaldehyde in aqueous solution, and the fluorescence enhancement and naked-eye detection of BZ have been rarely reported. In addition, JXUST-19 based fluorescent test papers, light-emitting diode lamp beads, and portable composite films were developed to realize naked-eye detection of BZ and SA, which has great potential in practical applications.