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Article Abstract
A functional amide-type pincer ligand was designed and synthesized, which could effectively capture Tb ions to form a phosphorescence complex-based chemosensor Tb-1. The chemosensor could further coordinate with Pb ions and display a turn-on phosphorescence response. This sensing process was analyzed in detail by steady-state luminescence spectroscopy, time-resolved luminescence spectroscopy, electron microscopy and dynamic light scattering, which suggest that the formation of Pb-induced hydroxide nanoclusters can adjust the optical signal of the external luminescence compound by embedment and fixation of Tb complexes. Furthermore, Tb-1 could effectively eliminate the signal interference from the short-lived fluorescence and improve the signal-to-noise ratio to increase the accuracy of the detection for Pb. An understanding of the recognition mechanism of the Tb complex-based chemosensor and the application of the characteristic spectra of lanthanide ions might be able to provide more opportunities to develop highly selective optical chemosensors.
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