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

[img]PDF - Authorized users only
Language: English
137Kb
Title:Ultraviolet Absorption Spectra and Dissociation Constants of Diamino-1,3,5-triazines
Creators:
Pérez, Rafael
Marín Galvín, Rafael
Rodríguez Mellado, José M.
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 67, 4, pp. 429-438
Uncontrolled Keywords:Determination, Herbicides, UV spectroscopy, Basicity, 1,3,5-Triazine-2,4-diamines, Dissociation constants

Abstract

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 p<i>K</i><sub>b</sub> 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. <p>

Title:Ultraviolet Absorption Spectra and Dissociation Constants of Diamino-1,3,5-triazines
Creators:
Pérez, Rafael
Marín Galvín, Rafael
Rodríguez Mellado, José M.
Uncontrolled Keywords:Determination, Herbicides, UV spectroscopy, Basicity, 1,3,5-Triazine-2,4-diamines, Dissociation constants
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:67
Number:4
Page Range:pp. 429-438
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc20020429UNSPECIFIED
ID Code:1932
Item Type:Article
Deposited On:06 Feb 2009 17:14
Last Modified:06 Feb 2009 16:14

Citation

Pérez, Rafael; Marín Galvín, Rafael; Rodríguez Mellado, José M. (2002) Ultraviolet Absorption Spectra and Dissociation Constants of Diamino-1,3,5-triazines. Collection of Czechoslovak Chemical Communications, 67 (4). pp. 429-438. ISSN 0010-0765

Repository Staff Only: item control page