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Protolytic photodissociation of some hydroxyaromatic compounds, ArOH (1-and 2-naphthol, chlorosubstituted naphthols), was studied in micellar solutions and phospholipid vesicles by fluorescence spectra and kinetics. Experimental results give evidence of two localization sites of naphthols in the microphase of these systems. In lipid bilayer membranes of vesicles there are two comparable fractions of ArOH molecules, one of which undergoes photodissociation but the other does not dissociate. In micelles, a minor fraction (few percent) of ArOH molecules, which are located probably in the core of the micelle, do not take part in excited-state proton-transfer reaction. These phenomena refllect heterogeneous structure and dynamic properties of lipid bilayer membranes and micelles.

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