Abstract
ABSTRACTA novel squaraine dye, 6-carboxy-2-[[3-[1,3-dihydro-3,3-dimethy-1-ethyl-2H-indol-2-ylidene)methyl]-2-hydroxy-4-oxo-2-cyclobuten-1-ylidene]methyl]-3,3-trimethy-3H-indolium, has been synthesized. The squaraine dye was found to be a dual colorimetric and fluorescent probe for the determination of iron (III) in CH3CH2OH/H2O (4:1, v/v) exhibiting high selectivity and sensitivity. The binding of squaraine dye +Fe3+ was studied by a Job’s plot and Fourier transform infrared and 1H nuclear magnetic resonance spectroscopies. The result indicates that the squaraine dye may be utilized as a naked-eye and real-time probe for the efficient determination of Fe3+.
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