Efficient and selective fluorescence sensing of nitro-containing aromatic compounds by a binuclear lanthanide-based metal-organic framework

• Published in: Journal of solid state chemistry 2022-12, Vol.316, p.123568, Article 123568
• Main Authors: Song, Nuan, Li, Wenjing, Luo, Wanshuo, Zhai, Zhaodong, Wang, Shuyun, Huai, Ranran, Zhang, Daopeng, Zhou, Zhen, Yang, Lu
• Format: Article
• Language: English
• Subjects: Fluorescence sensing; Metal-organic frameworks; Nitro-containing aromatic compounds; Selectivity; Tetraphenylethene
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2022.123568

The rapid and selective detection of the highly toxic and explosive nitro-containing aromatic compounds has been drawn more and more attention. Herein, a lanthanide-based metal-organic framework (1) was synthesized by incorporating a tetraphenylethylene moiety as the four-point connected node, and exhibits a three-dimensional porous material. This new synthesized MOF exhibits excellent fluorescence activity, due to the ligand-emission effect, and could be regarded as a sensitive and selective fluorescence sensor for p-nitroaniline (NA) over the nitro-containing aromatic compounds with almost complete fluorescence quenching after adding NA into the suspension system. The mechanism of fluorescence sensing process has been also researched by DFT studies and UV–vis adsorption spectra to gain an insight analysis. A porous binuclear lanthanide tetraphenylethylene-containing MOF, has been synthesized and regarded as a sensitive and selective fluorescence sensor towards p-nitroaniline (NA) over the nitro-containing aromatic compounds. [Display omitted] ●A new porous metal-organic framework has been synthesized based on the excellent fluorescence emission of tetraphenylethylene-based ligands with binuclear La(III) clusters.●Fluorescence sensing experiments showed the efficient and selective sensing of this material towards p-nitroaniline among a series of nitro-containing aromatic compounds.●DFT studies and UV–vis adsorption spectra have been researched to gain an insight analysis to elucidate the fluorescence quenching mechanism.