THERMOCHROMISM OF CORROLE SOLUTIONS IN ETHANOL
Abstract
The temperature dependence of the electronic absorption spectra of the 5,10,15-triarylcorrole family solutions in ethanol was studied in the temperature range 288—328 K. Corrole molecules in ethanol was found to be as a mixture of the free base and deprotonated forms, with their proportion determined by donating-accepting properties of peripheral substituents. It was established that temperature rise leads to the deprotonation of the free base molecules. Deprotonation process is governed by Van’t Hoff equation with activation energy Еа = 2.0 kcal/mol, which was found to be the same for all the studied compounds within the experimental error. It was supposed that temperature influences deprotonation indirectly, by adjusting the dielectric constant of ethanol. Decrease in the dielectric constant with temperature rise shifts the acidbase equilibrium to the formation of the deprotonated form.
About the Authors
Y. H. Ajeeb
Art, Sciences&Technology University in Lebanon; Belarusian State Technological University
Lebanon
Lebanon
Beirut, PO Box 14-695, Lebanon;
13а Sverdlov Str., Minsk, 220006, Belarus
A. A. Minchenya
Belarusian State Technological University
Belarus
13а Sverdlov Str., Minsk, 220006
Belarus
13а Sverdlov Str., Minsk, 220006
P. G. Klimovich
Belarusian State Technological University
Belarus
13а Sverdlov Str., Minsk, 220006
Belarus
13а Sverdlov Str., Minsk, 220006
W. Maes
Institute for Materials Research (IMO-IMOMEC), Hasselt University
Belgium
Diepenbeek, B-3590
Belgium
Diepenbeek, B-3590
M. M. Kruk
Belarusian State Technological University
Belarus
13а Sverdlov Str., Minsk, 220006
Belarus
13а Sverdlov Str., Minsk, 220006
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Review
For citations:
Ajeeb Y.H., Minchenya A.A., Klimovich P.G., Maes W., Kruk M.M. THERMOCHROMISM OF CORROLE SOLUTIONS IN ETHANOL. Zhurnal Prikladnoii Spektroskopii. 2019;86(5):697-704. (In Russ.)
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