Merocyanine-type dyes from barbituric acid derivatives. |
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Authors: | M C Rezende P Campodonico E Abuin J Kossanyi |
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Institution: | Facultad de Química y Biología, Universidad de Santiago de Chile. mcaroli@lauca.usach.cl |
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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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