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The effect of Pluronics on the photocatalytic activity of water-soluble porphyrins

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Abstract

Solubilization of hydrophilic porphyrins, 2,7,12,18-tetramethyl-3,8-di(1-methoxyethyl)-13,17-di(2-oxycarbonylethyl) porphyrin disodium salt (dimegin) and N-methyl-di-D-glucose amine salt of chlorine e 6 (photoditazine), as well water-insoluble meso-tetraphenylorphyrin in the micelles of Pluronics (triblock copolymers and propylene oxide and ethylene oxide), increases the photocatalytic activity of porphyrins in the course of the oxidation of L-tryptophan in aqueous salt-containing solutions. The maximum photocatalytic activity is attained for the photocatalysts based on the Pluronics P85 and F127 containing 50–70% ethylene oxide units. As a result of solubilization, the activity of tetraphenylporphyrin increases by a factor of 50, while the activities of hydrophilic dimegin and photoditazine increase by factors of 1.5 and 6, respectively. The increased activity of tetraphenylporphyrin is due to the dissolution and dissociation of aggregates in the presence of Pluronics. The increased activity of dimegin, which is known to aggregate in water, is primarily provided by disaggregation. In the case of photoditazine, which does not form aggregates in aqueous solutions and is likely to be localized in the polar micellar “crown,” the effect of a polymer is due to the local concentration of both a substrate and a catalyst in the micellar pseudophase.

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Correspondence to N. S. Melik-Nubarov.

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Original Russian Text © T.M. Zhientaev, N.S. Melik-Nubarov, E.A. Litmanovich, N.A. Aksenova, N.N. Glagolev, A.B. Solov’eva, 2009, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2009, Vol. 51, No. 5, pp. 757–767.

This study was supported by the Program of Fundamental Studies, Division of Chemistry and Materials Science, Russian Academy of Sciences, State Contract no. 10002-251 (07/125-121/200704-032); by the Russian Foundation for Basic Research, project no. 07-02-00066-a; and by a grant for State Support of Leading Scientific Schools, Nsh-5899.2006.3.

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Zhientaev, T.M., Melik-Nubarov, N.S., Litmanovich, E.A. et al. The effect of Pluronics on the photocatalytic activity of water-soluble porphyrins. Polym. Sci. Ser. A 51, 502–511 (2009). https://doi.org/10.1134/S0965545X09050034

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  • DOI: https://doi.org/10.1134/S0965545X09050034

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