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Lewis Acid Mediated One Pot Solvent Free Synthesis of Phenolics Based Chimeric Azo Dyes Used as Suitable Acid-Base Indicator

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Colorimetric pH responsive indicators are mainly synthetic dyes capable of changing their color upon interaction with chemical species. Their wide applications range from industry to drug design. In search for the development of a novel pH sensitive azo indicator in the pH range of 10 to 14, a novel one pot Lewis acid mediated solventfree grinding technique has been developed to synthesize various phenolics-based chimeric azo dyes. The synthesis involves in situ generation of diazonium ions in the solid phase under homogeneous mixing condition. The indicator efficiency and the mechanism of color change of the dyes are evaluated based on their electron donor-acceptor capability. Among them, only dyes #32 and #39 have been found to act as suitable acid-base indicator in the high pH range (pH >10). Extensive UV and NMR titration studies were carried out. Dye #32, in particular, behaves almost similar as phenolphthalein, thymolphthalein and alizarin yellow R in terms of their acid-base indicator property.
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Document Type: Research Article

Publication date: December 1, 2013

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  • Advanced Science Focus is a multidisciplinary peer-reviewed journal with a very wide- ranging coverage, consolidates fundamental and applied research activities in all areas of (1) Physical Sciences/Chemistry/Physics/Astronomy, (2) Engineering, (3) Biological Sciences, (4) Health Sciences, (5) Biomedical Sciences, (6) Medicine, (7) Agriculture Science and Engineering, (8) Veterinary Science, (9) Marine Science, (10) Wild Life and Forestry, (11) World Natural Resources (12) Nutrition and Food Science, (13) Mathematical Sciences, (14) Computer and Information Sciences, (15) Geosciences/Earth Science, (16) Atmospheric Sciences and Meteorology, (17) Energy Science and Technology, (18) Environmental Science/Green Science, Engineering and Technology, (19) Business Management, (20) Social Sciences, (21) Humanities/Anthropology, (22) Education, and (23) Public Policies and much more.
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