The investigation of the properties of micellar systems is of great practical importance, since the microheterogeneous structure, in particular, of aqueous-organic solutions can be used to create reaction centers with designed properties, which will make it possible to increase the efficiency of processes associated with the intra­-molecular conversion of the electronic excitation energy of a molecule. In the present paper, such model systems are the spatial-temporal structures (STS) formed as a result of photophysical and photochemical reactions, whose time characteristics are highly sensitive to a change in the solvent compositions.

Previously, the phenomenon of formation of the STS in alcohol solutions of anthraquinone at various ketone concentrations was investigated. It was shown that the luminescent photoproduct (ketyl radical) of anthraquinone is responsible for the formation of structures in this system. The STS evolution processes are slow and the structures formed have macroscopic sizes, which makes the system under consideration a convenient object for experimental studies.

We have investigated water-alcohol solutions with a different mass content of analytically pure isopropyl al­cohol, which was varied from 10 to 95% with a step of 5%. Analysis of the obtained spectral characteristics of the solutions under investigation has shown that in the water-alcohol solutions of anthraquinone, independent of the mass concentration of alcohol, the ketyl radical is respon­sible for the luminescence.

The microheterogeneous structure of water–alcohol solutions produces a strong effect on the intermolecular energy transfer rate, which in turn affects the behavior of luminescent STSs. A considerable decrease in the induction period of the appearance of an STS (t_ind<1 sec) was registered under irradiation by UV light of solutions with a 70% mass content of alcohol in the matrix, which corresponds to a simplified structure of the alcohol–water mixture.

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