Figure 2.
Fluorescence spectra of 1a–1e (10 μM) upon the addition of Cu2+ in aqueous solution (1 mM Tris-HCl, pH 7.2). The excited wavelength of 1a–1e: 465.0 nm, 465.0 nm, 410.0 nm, 465.0 nm, and 465.0 nm, respectively.
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