Singlet Molecular Oxygen from Superoxide Anion and Sensitized Fluorescence of Organic Molecules

Science  24 Apr 1970:
Vol. 168, Issue 3930, pp. 476-477
DOI: 10.1126/science.168.3930.476


The superoxide anion, O2-, evolves singlet molecular oxygen in dimethylsulfoxide solution. Pronounced water quenching of superoxide-sensitized luminescence is indicative of the preferential generation of the 1σg+ state. Recent identification of O2- in the xanthine oxidase system suggests that the generation of singlet oxygen may also occur in enzymatic systems.