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Solvatochromic studies of stationary phases on thin-layer chromatographic plates

Three polarity-indicating dyes, Reichardt's betaine, N,N-diethyl-4-nitroaniline, and N-methyl-2-nitroaniline, have been used to characterize the mobile-phase-stationary-phase interface of thin-layer chromatographic plates. Diffuse reflectance spectroscopy was used to detect the shifts in the wavelength maxima of these dyes, which have been related to the π* and E T (30) solvent polarity scales