Enhanced chemiluminescence of peroxomonosulfate-cobalt (II) system in the presence of dicarboxylic acids.
In the present work, the effects of molecular mass aliphatic dicarboxylic acids on the HSO(5)(-)-Co(2+) chemiluminescence (CL) system were investigated. It was found that the aliphatic dicarboxylic acids could enhance the CL of the HSO(5)(-)-Co(2+) system. Moreover, the CL intensities improved regularly with increasing carbon chain length of the dicarboxylic acids. To investigate the CL enhancement mechanism, dynamic profiles, CL spectroscopy, ESR spectrum and the effects of various free radical scavengers on the CL system were employed. The results indicated that the enhancement of the CL should be attributed to the formation of peroxo-diacid, which finally decomposed to the original dicarboxylic acid and singlet oxygen. The mechanism of the HSO(5)(-)-Co(2+)-dicarboxylic acid CL system was then proposed.
Zhou
Yun
Y
Analysis Center and Department of Chemistry, Tsinghua University, Beijing, People's Republic of China.
Ogawa
Nobuaki
N
Lin
Jin-Ming
JM
D003035:Cobalt / Q000737:chemistry*; D003998:Dicarboxylic Acids / Q000737:chemistry*; D004867:Equipment Design; D017022:Flow Injection Analysis / Q000295:instrumentation; D049449:Luminescence; D008163:Luminescent Measurements / Q000295:instrumentation; D010545:Peroxides / Q000737:chemistry*
D003998:Dicarboxylic Acids; D010545:Peroxides; C038288:peroxymonosulfate; D003035:Cobalt