Nature of chromogens of protonated azobenzene

Autor:	L. N. Guseva, Yu. A. Ershov, Yu. A. Mikheev
Rok vydání:	2014
Předmět:	Cellulose triacetate chemistry.chemical_compound Ultraviolet visible spectroscopy Absorption spectroscopy Azobenzene Chemistry Protonation Sulfuric acid Electronic structure Physical and Theoretical Chemistry Photochemistry Oleum
Zdroj:	Russian Journal of Physical Chemistry A. 89:224-231
ISSN:	1531-863X 0036-0244
Popis:	Changes in the absorption spectra of azobenzene in UV-Vis light are studied with respect to its protonation in sulfuric acid solutions and interaction with gaseous HCl in cellulose triacetate films. In both processes, the emergence of an intense orange color is shown to represent the electronic structure of forming monocations where the positive charge of NH+ groups shifts electrons from the o- and p-positions of Nphfragment phenyls. It was found that the charge distribution and color was the same as observed for the cations of the benzyl and phenylaminyl types. The mechanism of azobenzene monocation photocyclization in sulfuric acid is presented, and the origin of the red color of azobenzene dications formed in oleum is explained.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b08a19a73a4c0ec9eb160f5f694d0f78 https://doi.org/10.1134/s003602441501015x Zobrazit plný text záznamu Full text from SpringerLink