Collect. Czech. Chem. Commun. 2002, 67, 429-438

Ultraviolet Absorption Spectra and Dissociation Constants of Diamino-1,3,5-triazines

Rafael Pérez, Rafael Marín Galvín and José M. Rodríguez Mellado*

Departamento de Química Física y Termodinámica Aplicada, Facultad de Ciencias, Universidad de Córdoba, E-14004-Córdoba, Spain


This paper presents ultraviolet absorption spectra of two diamino-1,3,5-triazines, namely 1,3,5-triazine-2,4-diamine (DT) and 6-chloro-1,3,5-triazine-2,4-diamine (ClDT). The spectra were fitted to the log-normal distribution. In the more energetic zone of the spectrum both compounds presented common bands, placed around 204-205 and 223-226 nm (depending on the pH of the medium). At higher wavelengths the spectra were different, with bands appearing in the range 235-267 nm. From variations of the maximum absorbances of the individual bands, the pKb values 3.5 ± 0.2 and 1.2 ± 0.1 were obtained for protonation of the ring nitrogen placed between the amine radicals of DT and ClDT, respectively, and 9.35 ± 0.2 and 11.5 ± 0.1 for dissociation of the amino groups of DT and ClDT, respectively.

Keywords: UV spectroscopy; Dissociation constants; 1,3,5-Triazine-2,4-diamines; Herbicides; Basicity; Determination.

References: 29 live references.