A porous Cd-based metal-organic framework for sensitive and selective detection of aspartic acid/Ag+ in aqueous medium

• Published in: Journal of luminescence 2021-03, Vol.231, p.117798, Article 117798
• Main Authors: Gao, Ting, Gao, Lingling, Zhang, Jie, Zhou, Wendi, Zhang, Zhikai, Niu, Xiaoyan, Hu, Tuoping
• Format: Article
• Language: English
• Subjects: Ag+ion; Aqueous medium; Aspartic acid; Luminescence probe; Porous metal-organic framework
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2020.117798

The development of a fast and stable luminescence detection method is of great significance to people's health and the protection of the ecological environment. In this work, a porous three-dimensional (3D) Cd-based metal-organic framework (MOF1) has been synthesized by the reaction of tri(p-carboxyphenyl)phosphane oxide (H3L) and 1,4-bis(pyrid-4-yl)benzene (1,4-bpb) with Cd2+ ions based on the mixed-ligand strategy, and characterized by powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA) and scanning electron microscope (SEM), etc. The luminescence experiments of MOF1 for amino acids and cations showed that MOF1 has highly sensitive and selective recognition for aspartic acid/Ag+ in aqueous medium. Meanwhile, the recognition mechanism of MOF1 for aspartic acid/Ag+ was analyzed by a series of experiments, the results indicate that the energy gap between HOMO energy values of H3L and aspartic acid/Ag+ is recognition impetus of MOF1 for aspartic acid by enhancement luminescence and for Ag+ by luminescence quenching, the sensing processes of MOF1 for aspartic acid and Ag+ ions are dynamic and static respectively by fluorescence lifetimes. Furthermore, the cycle and anti-interference experiments indicate that MOF1 has good luminescence stability and high sensing selectivity for aspartic acid and Ag+. The above results indicate that MOF1 has potential applications in recognizing aspartic acid and Ag+ in aqueous medium. A luminescence MOF1 has solvothermally been synthesized by the mixed-ligand strategy. MOF1 has highly sensitive and selective recognition of aspartic acid by enhancement luminescence and dynamic process, while by luminescence quenching and static process for Ag+. [Display omitted] •A porous MOF1 was solvothermally synthesized by the mixed-ligand strategy.•MOF1 has sensitive and selective detection of aspartic acid/Ag+ in aqueous medium.•The sensing of MOF1 for aspartic acid/Ag+ are dynamic/static processes.