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The influence of pH on aggregate formation and changes in the structure of thionine monomers in solution has been determined. Spectroscopic data (UV–vis and 1 H NMR) revealed that a free base form of the dye is formed at basic pH values, which displays highly hydrophobic behavior. The cationic monomeric form can be photoreduced in both organic and aqueous solution, while the free base form did not show any photoactivity in such media.
Instituto Multidisciplinario de Biologia Vegetal (IMBIV – CONICET), Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Cordoba CP 5000, Argentina
Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC – CONICET), Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Pabellón Argentina, Ala 1, Piso 2, Ciudad Universitaria, Cordoba CP 5000, Argentina
Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC – CONICET), Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Pabellón Argentina, Ala 1, Piso 2, Ciudad Universitaria, Cordoba CP 5000, Argentina
Instituto de Investigaciones en Fisicoquímica de Córdoba (INFIQC – CONICET), Departamento de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Pabellón Argentina, Ala 1, Piso 2, Ciudad Universitaria, Cordoba CP 5000, Argentina