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SPECTROSCOPIC STUDY OF THE DIMERIZATION OF 5,10,15,20-TETRAKIS(6-N-METHYLQUINOLINYL)-PORPHYRIN IN WATER SOLUTIONS

Abstract

Dimerization of 5,10,15,20-tetrakis(6-N-methylquinolinyl)-porphyrin in water solutions in the temperature range of 274—343 K was studied using absorption and fluorescence spectroscopy. The equilibrium dimerization constant KD was shown to vary in a wide range upon the temperature changes. The enthalpy ΔH and entropy ΔS of dimerization in solution with different ionic strength were measured and dimerization was found to be enthalpy driven process in all the cases. Large negative values of the dimerization enthalpy ΔH were proposed to be explained by the optimal overlapping of porphyrin macrocycles due to the minimization of the Coulomb repulsion of ionized peripheral substituents located at a large distance from the macrocycle.

About the Authors

D. V. Klenitsky
Belarusian State Technological University
Belarus
Minsk, 220006


I. V. Vershilovskaya
Belarusian State Technological University
Belarus
Minsk, 220006


M. M. Kruk
Belarusian State Technological University
Belarus
Minsk, 220006


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Review

For citations:


Klenitsky D.V., Vershilovskaya I.V., Kruk M.M. SPECTROSCOPIC STUDY OF THE DIMERIZATION OF 5,10,15,20-TETRAKIS(6-N-METHYLQUINOLINYL)-PORPHYRIN IN WATER SOLUTIONS. Zhurnal Prikladnoii Spektroskopii. 2020;87(5):700-705. (In Russ.)

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ISSN 0514-7506 (Print)