Abstract
The composition and stability of the crystalline H associates of NH active tetrapyrroles with electron-donor solvents were investigated by thermogravimetry. It was found that common porphyrins and their analogs can form 1: 1 and 1: 2 macrocycle solvent H associates whose energy of formation depends on their composition and ranges from 20 to 115 kJ/mol. Based on the results from an analysis of the Stokes shifts, we concluded that the formation of H associates in a solution is accompanied by variations in the degree of macrocycle nonplanarity. The stability of a series of tetrapyrroles with regard to thermal destruction in argon atmosphere and in the presence of atmospheric oxygen was shown to drastically vary.
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Original Russian Text © D.B. Berezin, D.R. Karimov, V.P. Barannikov, A.S. Semeikin, 2011, published in Zhurnal Fizicheskoi Khimii, 2011, Vol. 85, No. 12, pp. 2325–2330.
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Berezin, D.B., Karimov, D.R., Barannikov, V.P. et al. Thermal stability of porphyrins with chemicaly active NH bond and their associates with electron-donor solvents. Russ. J. Phys. Chem. 85, 2171–2176 (2011). https://doi.org/10.1134/S0036024411120041
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DOI: https://doi.org/10.1134/S0036024411120041