Highly selective and turn-on fluorescence probe with red shift emission for naked-eye detecting Al3+ and Ga3+ based on metal-organic framework

• Published in: Chinese chemical letters Vol. 33; no. 1; pp. 541 - 546
• Main Authors: Wu, Linhui, Yao, Shuli, Xu, Hui, Zheng, Tengfei, Liu, Suijun, Chen, Jinglin, Li, Na, Wen, Herui
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2022; School of Chemistry and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China%School of Materials Science and Engineering,Tianjin Key Laboratory of Metal and Molecule-Based Material Chemistry,Nankai University,Tianjin 300350,China
• Subjects: Al3+ and Ga3; Fluorescence probe; Metal-organic frameworks; Naked-eye detection; Red shift emission; Turn-on effect; Fluorescence probe; Metal-organic frameworks; Red shift emission; Al3+ and Ga3; Naked-eye detection; Turn-on effect
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2021.06.009

A novel ZnII-based metal-organic framework with the formula of {[Zn2(BBIP)2(NDC)2]·H2O}n (JXUST-5) derived from 3,5-bis(benzimidazol-1-yl)pyridine (BBIP) and 1,4-naphthalenedicarboxylic acid (H2NDC) has been synthesized. The adjacent ZnII ions are linked through two BBIP ligands to form a [Zn2(BBIP)2] secondary building unit (SBU). The neighbouring SBUs are further connected by NDC2− with μ2-η1:η1 and μ2-η1:η1:η1 bridging modes to form a two-dimensional (2D) framework. Topological analysis shows that JXUST-5 could be simplified as an uninodal fes topology with a point symbol of {4.82}. Furthermore, the 2D framework net could be extended through C-H···π interaction to form the three-dimensional supramolecular structure. Luminescent experiments suggest that JXUST-5 could selectively and sensitively recognize Al3+ and Ga3+ through fluorescence enhancement effect along with a relatively large red shift. The detection limits for Al3+ and Ga3+ are 0.17 and 0.69 ppm, respectively. Interestingly, the sensing process for both Al3+ and Ga3+ could be directly observed with naked eyes under 365 nm UV lamp. Notably, JXUST-5 could be recycled at least five times as a fluorescent sensor toward Al3+ and Ga3+, which is the second example of turn-on MOF based fluorescent sensor toward Ga3+. A novel ZnII-based MOF could selectively and sensitively recognize Al3+ and Ga3+ through fluorescence enhancement effect along with a relatively large red shift. Significantly, the MOF is the second turn-on MOF fluorescent sensor toward Ga3+. [Display omitted]