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  • Title: Merocyanine-type dyes from barbituric acid derivatives.
    Author: Rezende MC, Campodonico P, Abuin E, Kossanyi J.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2001 May; 57(6):1183-90. PubMed ID: 11419461.
    Abstract:
    The preparation and the solvatochromic behavior of two dyes, obtained by condensation of N,N'-dimethylbarbituric acid with dimethylaminobenzaldehyde and with 4,4'-bis(N,N-dimethylamino)benzophenone (Michler's ketone) are described. The latter dye is rather sensitive to the polarity of the medium, and in particular, to the hydrogen-bond-donor ability of protic solvents. The solvatochromism of both compounds is discussed in terms of the pi* and E(T)(30) solvent polarity scales and their differences in behavior interpreted with the aid of semiempirical calculations.
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