Amino-Functionalized Luminescent Metal–Organic Framework for Turn-On Detection of Al<sup>3+</sup> Ions
Chaohui Lin, Lixiang Chen, Ya Ping Wang, Xiao‐Li Lai, Lingshan Gong, Yingxiang Ye
Abstract
Aluminum products have a wide range of applications in daily life, but excessive accumulation of aluminum (Al 3+ ) ions causes diseases and affects human health. The accurate detection of Al 3+ ions is crucial for preventing their accumulation and mitigating adverse effects on human health. Herein, a luminescent metal–organic framework (MOF), FJU-40-NH 2, has been designed for selective aluminum ion (Al 3+ ) detection with a significantly enhanced fluorescence response. This designed FJU-40-NH 2 incorporates a π-conjugated aromatic system as luminescent units and abundant free amino groups as potential binding sites, endowing it with an exceptional ability to selectively sense Al 3+ ions. This host–guest interaction results in a significant fluorescence enhancement, making the FJU-40-NH 2 an ideal “turn-on” sensor for Al 3+ ions with high sensitivity, selectivity, and stability. This substantial fluorescence enhancement is due to the efficient electron transfer after the interaction between Al 3+ ions and the amino groups of FJU-40-NH 2 . More importantly, this “turn-on” fluorescent sensor has been successfully utilized for the analysis of Al 3+ ion content in real food samples, yielding recoveries ranging from 92.2 to 105.0%, confirming its potential applications in practical environmental and food safety monitoring.