Abstract
The temperature dependence of electronic absorption spectra of a family of 5,10,15-triarylcorroles in EtOH solution was studied in the range 288ā328 K. Corroles in EtOH existed as mixtures of the free base and deprotonated form, the ratio of which was determined by the donorāacceptor properties of the peripheral substituents. Free corrole bases deprotonated as the temperature rose. Deprotonation obeyed the vanā²t-Hoff equation with activation energy Ea = 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 acidābase equilibrium toward formation of the deprotonated form.
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