title: An efficient fluorescence sensor for superoxide with an acridinium ion-linked porphyrin triad.
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.
authors.affiliation: Department of Material and Life Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kotani
authors.forename: Kei
authors.initials: K
authors.lastname: Ohkubo
authors.forename: Maxwell J
authors.initials: MJ
authors.lastname: Crossley
authors.forename: Shunichi
authors.initials: S
authors.lastname: Fukuzumi
mesh_terms: D000166:Acridines / Q000737:chemistry*; D043844:Crown Ethers / Q000737:chemistry; D005453:Fluorescence; D007477:Ions / Q000737:chemistry; D011166:Porphyrins / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence; D013481:Superoxides / Q000032:analysis*
chemical_list: D000166:Acridines; D043844:Crown Ethers; D007477:Ions; D011166:Porphyrins; D013481:Superoxides; C015762:18-crown-6