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Spectrophotometric study of equilibrium association of cationic acids of tetraphenylporphyrin β-bromo-derivatives in acetonitrile-perchloric acid system at 298 K

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Abstract

The basic properties of 2-bromo-5,10,15,20-tetraphenylporphyrin (I), 2,3,12,13-tetrabromo-5,10,15,20-tetraphenylporphyrin (II) and 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetraphenylporphyrin (III) in the system of acetonitrile-perchloric acid at 298 K were studied using a method of spectrophotometric titration. The protonation of endocyclic nitrogen atoms of tetrapyrrole macrocycles was found to occur in two stages, therewith the increase in the number of bromine atoms in the structure of the macrocycle made easier the addition of the first proton compared with the second one. The ionization constant and the concentration ranges of existence of mono- and dication forms of the compounds were determined.

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  1. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, ul. Akademicheskaya 7, Ivanovo, 153045, Russia

    Yu. B. Ivanova & N. V. Chizhova

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  1. Yu. B. Ivanova
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  2. N. V. Chizhova
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Correspondence to Yu. B. Ivanova.

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Original Russian Text © Yu.B. Ivanova, N.V. Chizhova, 2013, published in Zhurnal Obshchei Khimii, 2013, Vol. 83, No. 1, pp. 132–135.

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Ivanova, Y.B., Chizhova, N.V. Spectrophotometric study of equilibrium association of cationic acids of tetraphenylporphyrin β-bromo-derivatives in acetonitrile-perchloric acid system at 298 K. Russ J Gen Chem 83, 124–127 (2013). https://doi.org/10.1134/S1070363213010210

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  • DOI: https://doi.org/10.1134/S1070363213010210

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