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This study accentuates the synthesis and characterization of vanillin azo dye conjugate based on naked-eye colored chemodosimeters. Vanillin azo dye conjugate exhibited high selectivity and sensitivity in absorbance for detection of Fe(III) ions in all solvents which can be observed simply by naked eye. Mostly the variation occurs in hypochromic shift of different metals with ligand but Fe(III) ions show hypsochromic in all solvents. It was found that the selectivity is more prominent in non-polar or less polar solvents like Chloroform, diethyl ether etc but less protruding in more polar solvents such as DMSO. The detection limit of the synthesized ligand with Fe(III) ions probe was shown by dilution method up to 0.39 ppm. The formation of complexes with azo dye was also affected by dielectric constant of the solvents.

Synthesis and Optical Study of Sensitive and Selective Detection of Fe (III) ions Based on Solvents