Title: Absorption Spectra of Heterocyclic Compounds. Some 6-Hydroxy[1,3,4]thiadiazolo[2,3-<i>b</i>]benzimidazoles and Their Quaternary Derivatives
Abstract:Some 2-alkyl-6-hydroxy[1,3,4]thiadiazolo[2,3-b]benzimidazoles have been synthesised. Their absorption spectra at different pH show bathochromic shift of the absorption band in the longer wavelengths, ...Some 2-alkyl-6-hydroxy[1,3,4]thiadiazolo[2,3-b]benzimidazoles have been synthesised. Their absorption spectra at different pH show bathochromic shift of the absorption band in the longer wavelengths, which is more pronounced in basic medium. This is ascribed to the dipolar nature of the compounds. Quaternary derivatives of the compounds show a further red shift in the absorption band in the visible region, which further corroborates their dipolar nature.Read More