The quenching of the fluorescence of trans-thioindigo and the inhibition of its photoisomerization to the cis-isomer by phenols support the idea that the photostability of indigo is due to a proton-transfer in the excited singlet state.
G. M. Wyman, J. Chem. Soc. D, 1971, 1332 DOI: 10.1039/C29710001332
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