pH dependent absorption and fluorescence spectra of hypericin 1 and its octahydroxy analogue 3 demonstrate their acidic properties, their deprotonation occuring in the ground and excited states from OH in the bay region and in the peri position to the carbonyl, respectively; the presence of the anion of 1 in the crystalline state is established by X-ray diffraction.
D. Freeman, F. Frolow, E. Kapinus, D. Lavie, G. Lavie, D. Meruelo and Y. Mazur, J. Chem. Soc., Chem. Commun., 1994, 891 DOI: 10.1039/C39940000891
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