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Anion Exchange on Surface Induces Drastic Fluorescence Response in Cu(II) Coordination Polymer Crystals

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journal contribution
posted on 24.03.2021, 19:00 by Lu Huang, Hongyuan Cheng, Luxi Wang, Xiaojing Wu, Bo Qin
Driven by π–π and CH−π interactions, coordination polymer-based crystals (Cu­(II)-CPCs) were formed from 1D aggregated copper­(II) complexes. Interestingly, these Cu­(II)-CPCs crystals exhibit distinctively differential fluorescence properties in response to various types of anions. More interestingly, it was found that anion exchange occurring on the Cu­(II)-CPC surface alone was sufficient to promote drastic and near-maximum modulation of their fluorescence properties. Extensive data from the nonlinear fluorescence analysis, ion exchange transmission electron microscopy (TEM) element mapping, analysis of anions by ion chromatography, and X-ray photoelectron spectroscopy (XPS) confirmed the surface structure to be the main factor that controls the fluorescence response of Cu­(II)-CPCs.