Chemiluminescent reaction of sulphite auto-oxidation in the presence of Ni(II)/tetraglycine and ruthenium(II)/bipy complexes: mechanistic considerations.
The present work is a mechanistic study of the possible analytical chemiluminescent reaction of sulphite oxidation in the presence of dissolved oxygen, Ni(II)/tetraglycine and [RuII(bipy)3]2+ ions. The Ni(III) complex oxidizes SO32- to SO3-, reacts with oxygen to produce SO5-, initiating a radical chain reaction. The strong oxidants generated oxidize Ni(II) and Ru(II) complexes in one redox cycle, which is related to the balance of SO32- and oxygen concentrations. The emission intensity depends on the concentrations of SO32-, Ni(II) and Ru(II) complexes.
Bonifácio
Rodrigo Leandro
RL
Instituto de Química, Universidade de São Paulo, CP 26077, CEP 05513-970, São Paulo, SP, Brazil.
Coichev
Nina
N
D015082:2,2'-Dipyridyl / Q000031:analogs & derivatives* / Q000737:chemistry; D056831:Coordination Complexes; D049449:Luminescence; D009532:Nickel / Q000737:chemistry*; D009842:Oligopeptides / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D012680:Sensitivity and Specificity; D013447:Sulfites / Q000737:chemistry*; D013997:Time Factors; D017975:Ruthenium Compounds
D015082:2,2'-Dipyridyl; D056831:Coordination Complexes; D009532:Nickel; D009842:Oligopeptides; D009942:Organometallic Compounds; D010100:Oxygen; D013447:Sulfites; C547232:tris(2,2-bipyridine)-ruthenium(II); D017975:Ruthenium Compounds; C046274:glycyl-glycyl-glycyl-glycine