The longest-wavelength absorption bands of unprotonated piperidinoanthraquinones are charge-transfer in type, but on protonation of 1-piperidinoanthraquinone the band becomes n→π*, accompanied by marked differences in photosensitizing behaviour between unprotonated and protonated forms.
G. O. Phillips, A. K. Davies, J. F. McKellar and D. Price, J. Chem. Soc. D, 1969, 1097 DOI: 10.1039/C29690001097
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