Abstract
Dapsone has been receiving growing interest due to it use as a new class of corrosion inhibitors, forming copolymers with aniline, pyrrole, diphenylamine and 4-aminodiphenylamine. The present work focuses on characterizing the theoretical and experimental electronic spectra of the neutral, monoprotonated and diprotonated dapsone. The theoretical electronic spectrum was obtained through the excited state characterization via time-dependent DFT theory. NBO analysis was carried out to identify the molecular orbitals involved in the detected experimental UV bands. The detected absorption wavelength values for the neutral dapsone were 292 and 258 nm (experiment), and 286.9 and 251.7 nm (theoretical). Concerning the protonated dapsone species, it was observed that the absorbance values were strongly dependent on pH, especially at pH between 1.0 and 4.0. As the pH of the solution decreases, the experimental band at 292 nm slowly decreases and shifts to 290 nm, while the absorption at 258 nm decreases until it disappears, and a new absorption band arises at 240 nm. While, when the basicity increases, the absorption spectra of dapsone do not change, but a regular red shift is noticed, and it is continued even up to pH 14.0. The red-shifted spectra may be due to the formation of a monoanion and/or dianion, but the isosbestic points were not constant.
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Acknowledgements
The authors dedicate this work to Prof. Fernando Rei Ornellas for his excellence as an educator and supervisor, as well as for his leadership in the consolidation of the Computational Chemistry in Brazil. This work has been supported by Brazilian agencies Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) under Grants 2019/03729-8, 2017/07707-3 and 2018/22669-3, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) under Grants 307052/2016-8, 404337/2016-3, 309051/2016-9, 406107/2016-5 and 233595/2014-7.
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Moura, S.L., Fernandes, G.F.S., Machado, F.B.C. et al. Theoretical and experimental electronic spectra of neutral, monoprotonated and diprotonated dapsone. Theor Chem Acc 139, 53 (2020). https://doi.org/10.1007/s00214-020-2566-3
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DOI: https://doi.org/10.1007/s00214-020-2566-3