Figure 3.

Fluorescence spectra of a solution of R3 (5.0 × 10^–6 M) and 1 equiv of Na⁺ in MeCN/DMSO 9:1 (v/v), at 298 K and λ_ex = 307 nm, with increasing amounts of OAc^– ((0–3.31) × 10^–4 M). 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 the data fit.