Electrochemical and spectroelectrochemical studies of tert-butyl-substituted aluminum phthalocyanine

Tetra-tert-butylphthalocyanine aluminum (III) chloride was studied by voltammetric and potential resolved spectroelectrochemical methods in a non-coordinating solvent o-dichlorobenzene. Five redox transitions were found including two oxidation waves at 0.18 and 0.90 V and three reduction waves at-1.28,-1.65, and-2.63 V vs. Fc(+)/Fc. Electrochemical reversibility of the first oxidation and reduction processes was assessed by using the diagnostic criteria of cyclic voltammetry. First comprehensive spectroelectrochemical characterization of oxidation of the aluminum phthalocyanine is reported. Moreover, potential-resolved spectroelectrochemical titration revealed strong influence of aggregation on the UV-vis spectra and the half-wave potentials of the first oxidation transition and disclosed the presence of the partially oxidized complex in the initial solution, which noticeably affected the spectrum of the neutral form. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

In this study, tetra-tert-butylphthalocyanine aluminum (III) chloride was investigated in a non-coordinating solvent o-dichlorobenzene using voltammetric and potential resolved spectroelectrochemical methods. Five redox transitions were identified, and the first oxidation process was found to be electrochemically reversible. Potential-resolved spectroelectrochemical titration revealed the influence of aggregation on UV-vis spectra and the behavior of the aluminum phthalocyanine complex.