Abstract
Surface-enhanced Raman (SERS) and surface-enhanced resonance Raman spectroscopy (SERRS) of hypocrellin A, a photoactive antiviral and antineoplastic agent, are reported for the first time on aqueous silver colloid. An analysis of the excitation and pH dependent SERRS spectra of hypocrellin leads to: (i) the interpretation of the main vibrational modes of hypocrellin; (ii) the determination of hypocrellin SERRS marker bands for the carbonyl group protonation; and (iii) a conclusion about similar character of region where intramolecular hydrogen bond between quinoid carbonyl group and adjacent hydroxyl group is formed in hypocrellin with that of the structurally related phenanthro-perylen molecule, hypericin.
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