Distinctive Solvent Effect on the Optical Spectra of Polar Molecules and its Relevance to Solvatochromic Scales
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Abstract
Investigation of five chromophores bearing electron-donating groups in polar and nonpolar solvents revealed a substantial bathochromic shift in their optical spectra, observed already between the nonpolar, nonpolarizable solvent n-hexane and the nonpolar but polarizable solvent toluene. The magnitude of this shift is comparable to that observed between toluene and the highly polar solvent acetonitrile. Analysis based on various solvatochromic scales highlights the importance of both solvent and solute polarizability in the solvation process.
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