Accession Number : ADA131564

Title :   Transient Photochemistry of Neutral Red.

Descriptive Note : Interim technical rept.,


Personal Author(s) : Marks,G T ; Lee,E D ; Aikens,David A ; Richtol,H H

PDF Url : ADA131564

Report Date : Jul 1983

Pagination or Media Count : 36

Abstract : Although the transient photochemistry of thiazine dyes such as methylene blu e and thionine has been the subject of intensive study, the transient photochemistry of the azine dyes has received little attention. Reported here is such a study of neutral red (3-amino-6-dimethylamino-2-methylphenazine hydrochloride). Neutral red has long been used as both an acid-base indicator, and a biological stain but its transient photochemistry has been the subject of only one brief study which reported semireduced radical peaks at pH 4 and pH 11. Because both the triplet species and the semireduced radical species play critical roles in the photoredox reactions of dyes knowledge of the properties of these excited states is necessary for proper understanding of such processes. The present study establishes the major features of the acid-base behavior, the visible spectra and the decay kinetics of both the semiconducted radical species and the triplet species of neutral red.

Descriptors :   *Azines, *Chemical indicators, *Photochemical reactions, Red(Color), Dyes, Chemical radicals, Visible spectra, PH factor, Acid base equilibrium, Reaction kinetics

Subject Categories : Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE