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Fluorescence spectra of R2 (5.0 × 10–6 M) with increasing amounts of OAc– ((0–2.35) × 10–3 M) in MeCN/DMSO 9:1 (v/v) at 298 K and λex = 298 nm. The upper right inset shows the abundance of species during titration, where H = receptor and G = anion guest. Dashed lines represent the theoretical profiles from data fit.
