MECHANISM OF CHEMILUMINESCENCE REACTION BETWEEN HYPOBROMITE AND AMMONIA OR UREA

Citation
Xc. Hu et al., MECHANISM OF CHEMILUMINESCENCE REACTION BETWEEN HYPOBROMITE AND AMMONIA OR UREA, Bulletin of the Chemical Society of Japan, 69(5), 1996, pp. 1179-1185
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Chemistry
ISSN journal
0009-2673
Volume
69
Issue
5
Year of publication
1996
Pages
1179 - 1185
Database
ISI
SICI code
0009-2673(1996)69:5<1179:MOCRBH>2.0.ZU;2-C
Abstract
The reaction kinetics, the chemiluminescence spectra, the products, an d the lifetimes of emission species for the chemiluminescence reaction between hypobromite and ammonia or urea in an alkaline aqueous soluti on were investigated. Results show that the reaction mechanism for amm onia chemiluminescence is different from that for urea. The reaction o f ammonia and hypobromite produces NO2 in the gaseous phase and NO2- i n solution; however, the reaction of urea and hypobromite does not. Fo r the reaction of ammonia and hypobromite, chemiluminescence intensity obeys 1.5 order kinetics for hypobromite concentration when ammonia i s in excess, but the reaction of urea and hypobromite obeys second ord er kinetics for hypobromite when urea is in excess. The spectrum of th e chemiluminescence from the ammonia and urea with hypobromite shows a maximum intensity at 710, and at 510 nm, respectively. The chemilumin escence lifetimes of the emission species were 0.056 and 0.092 s for t he reaction of ammonia and the reaction of urea, respectively. The che miluminescence species of the reaction between hypobromite and ammonia seems to be excited NO2, that for urea seems to be excited N-2.