Thermochromism of corrole solutions in ethanol
| Autor: | Y. H. Ajeeb, A. A. Minchenya, Wouter Maes, Mikalai Kruk, P. G. Klimovich |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Absorption spectroscopy
02 engineering and technology Dielectric Activation energy термохромизм 01 natural sciences acid–base equilibria chemistry.chemical_compound Deprotonation corrole free base Corrole энергия активации Spectroscopy Thermochromism Ethanol Chemistry 010401 analytical chemistry Free base 021001 nanoscience & nanotechnology Condensed Matter Physics свободное основание коррола кислотно-основные равновесия 0104 chemical sciences депротонирование коррол acid-base equilibria activation energy Physical chemistry thermochromism 0210 nano-technology |
| Zdroj: | Article |
| Popis: | The temperature dependence of electronic absorption spectra of a family of 5,10,15-triarylcorroles in EtOH solution was studied in the range 288-328 K. Corroles in EtOH existed as mixtures of the free base and deprotonated form, the ratio of which was determined by the donor-acceptor properties of the peripheral substituents. Free corrole bases deprotonated as the temperature rose. Deprotonation obeyed the van ' t-Hoff equation with activation energy E-a = 2.0 kcal/mol, which was the same within measurement error limits for all studied compounds. The temperature was proposed to affect indirectly the deprotonation by changing the EtOH dielectric constant. The decreasing dielectric constant with increasing temperature shifted the acid-base equilibrium toward formation of the deprotonated form. |
| Databáze: | OpenAIRE |
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