[The enhancement and inhibition of lucigenin chemiluminescence by phenol and aniline derivatives].
The effect of phenol and aniline derivatives on the lucigenin-H2O2-Co2+ chemiluminescence (CL) at different pH was studied. In NaHCO-Na2CO3 medium, some compounds enhanced the lucigenin CL while others inhibited the lucigenin CL. In NaOH medium, all tested compounds inhibited the lucigenin CL. It was found that the magnitude of enhancement and inhibition by tested compounds was related to their molecular structures, media, and pH. The fluorescence spectra of the system after the CL reaction and the CL spectra of the lucigenin system were studied. The possible mechanisms for CL enhancement and inhibition have been proposed. On the one hand, the competition of phenol and aniline derivatives with lucegenin for H2O2/HO2(-) led to the inhibition. On the other hand, the nucleophilic adducts of lucigenin formed by the reactions of some phenol and aniline derivatives with lucegin reacted with lucigenin to give rise to lucigenin radicals, followed by the reactions with the dissolved oxygen to give CL, resulting in the enhancement. The competition of these two routes led to the CL enhancement or inhibition under different conditions.
Shi
Ming-juan
MJ
Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.
Aung
Myint
M
Dong
Yong-ping
YP
Cui
Hua
H