[Determination spectrophotometrique des constantes d'acidite de quelques 2,1,3-benzoselenadiazoles (piazselenoles)].
The variation with increasing acidity of the ultraviolet/visible region absorption spectrum of 2,1,3-benzoselenadiazole and five of its derivatives has been studied and the ionization constants were determined by using a new computer method for the correction of the medium effect. An infrared spectroscopic study was also done on these derivatives and the corresponding substituted 1,2-diamino-benzenes. Positive correlations were found between some infrared frequencies and either the values of the ionization constants or the sum of the Hammett substitution constants sigma(m) + sigma(p).
Neve
J
J
Laboratoire de Chimie Analytique et de Toxicologie, Institut de Pharmacie, Université Libre de Bruxelles, Campus Plaine, CP 205/1, B 1050 Bruxelles, Belgique.
Hanocq
M
M
Molle
L
L