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Improving Ion Selectivity of 1,4,7-Triazacyclononane-Based Receptor by Zinc Coordination: “Turn-On” Chemosensor for Br and Fe3+ Ions

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journal contribution
posted on 26.10.2020, 16:14 by Mei-Hua Lin, Xiao-Xia Ren, Xiao-Min Ning, Dong-Yang Liu, Jing Qian
Ion-responsive probes have gathered significant attention because of health and environmental factors, but there are few reports on the “turn-on” mechanism of Fe3+ and sensitive detection of Br by fluorescence measurement. Herein, a green luminescence material, N-5-acetyl-2-hydroxy-benzamide-1,4,7-triazacyclononane (btacn), was successfully synthesized for the first time and comprehensively characterized. As expected, btacn exhibits high sensitive, but nonspecific, extensive interaction with Cu2+, Co2+, Zn2+, Mn2+, and Fe3+ ions. Therefore, to improve the specificity of the probe, we tried to synthesize transition metal complexes of btacn, but all failed except Zn­(btacn)­Cl2. In addition, the preformed complex, Zn­(btacn)­Cl2, was used as a special “turn-on” chemosensor for detecting trace amounts of Br and Fe3+. The electrostatic interaction with Fe3+ and the hydrogen bond of PhO-H···Br leads to obvious changes in the electronic cloud of Zn­(btacn)­Cl2, which are reflected in different spectral responses.