| Abstract
| - The solvatochromic comparison method has been usedto probe the interactions of solutes with binary solventmixtures of methanol−water and acetonitrile−water. Thesolute spectra recorded in these mixtures are composedof the additive spectral contributions of the differentsolvated species of the solute, i.e., the water-solvatedspecies, the cosolvent-solvated species, and the speciessolvated by water−solvent complexes. Multivariate curveresolution-alternating least squares has been used tomodel the solvation of the solutes as a function of thecomposition of the binary solvent mixture. Spectra andconcentration profiles of the dye surrounded by thedifferent solvation environments have been isolated. Forthe first time, solute spectra solvated exclusively bymethanol−water and acetonitrile−water complexes havebeen obtained, and the solvatochromic parameters ofdipolarity/polarizability and hydrogen-bonding acidityhave been estimated for these complex species.
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