Pulse radiolysis and cyclic voltammetry studies of redox properties of phenothiazine radicals |
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| Institution: | 1. College of Materials & Chemical Engineering, China Three Gorges University, Yichang 443002, PR China;2. Department of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shang Luo University, Shang Luo 726000, PR China;1. Departamento de Química Analítica e Físico-Química, Centro de Ciências, Universidade Federal do Ceará, Bloco 940, Campus do Pici, 60440-900, Fortaleza-CE, Brazil;2. Departamento de Farmácia, Faculdade de Farmácia, Odontologia e Enfermagem, Universidade Federal do Ceará, Rua Capitão Francisco Pedro, 1210 Rodolfo Teófilo, 60430-370, Fortaleza-CE, Brazil;3. Departamento de Física, Universidade Federal do Ceará, Caixa Postal 6030 Campus do Pici, 60455-760 Fortaleza-CE, Brazil;4. Laboratório de Eletroanalítica Aplicada à Biotecnologia e à Engenharia de Alimentos, Campus de Patos de Minas, Universidade Federal de Uberlândia, Av. Getúlio Vargas, 230, Centro 38700-126, Patos de Minas-MG, Brazil;1. Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran;2. Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran |
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| Abstract: | One-electron transfer equilibria between seven phenothiazines were characterized by pulse radiolysis, producing radical-cations via oxidation by Br2·− or (SCN)2·− radicals. The reduction potentials of the phenothiazine radicals were determined by cyclic voltammetry. As an independent check, the redox equilibrium between one phenothiazine and the redox indicator ABTS was investigated. The data establish phenothiazines as useful indicators for radical redox properties. However, there are potential problems of aggregation, additional reactions with Br−/Br2·− and reactivity of the radicals towards buffers or other nucleophiles. |
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