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An efficient fluorescence sensor for superoxide with an acridinium ion-linked porphyrin triad
Hiroaki Kotani1, Kei Ohkubo, Maxwell J Crossley
1Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
Abstract:
Addition of potassium superoxide with 18-crown-6 ether (KO(2)(•-)-18-crown-6) to a toluene solution of an acridinium ion-linked porphyrin triad (Acr(+)-H(2)P-Acr(+)) resulted in a remarkable enhancement of the fluorescence intensity. Thus, Acr(+)-H(2)P-Acr(+) acts as an efficient fluorescence sensor for superoxide. Electron transfer from KO(2)(•-)-18-crown-6 to the Acr(+) moiety to produce the two-electron-reduced species (Acr(•)-H(2)P-Acr(•)) results in inhibition of the fluorescence quenching via photoinduced electron transfer, as revealed by laser flash photolysis measurements.
