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UV‐vis spectra of (a) 3 and (b) azulene in the presence of methanesulfonic acid (0–15 eq.) in CH2Cl2. [substance]0: 1.6×10−5 m. Inset: titration plots of 3 and azulene with methanesulfonic acid. (c) Simulated absorption spectra of 3 and 3 ⋅ H+.
