- Merocyanine-type dyes from barbituric acid derivatives.
Merocyanine-type dyes from barbituric acid derivatives.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (2001-06-23)
M C Rezende, P Campodonico, E Abuin, J Kossanyi
PMID11419461
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.