OXODIPYRROMETHENES AS REACTIVE SINGLET OXYGEN ACCEPTORS. MEASUREMENT OF THEIR CHEMICAL REACTION RATES BY A LASER FLASH PHOTOLYSIS TECHNIQUE |
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| Authors: | I B C Matheson D A Lightner |
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| Institution: | Department of Biochemistry. University of Georgia, Athens, GA 30602, U.S.A.;*Department of Chemistry, University of Nevada, Reno, NV 89557. U.S.A. |
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| Abstract: | Abstract— Singlet oxygen has been generated directly in 1,1,2-trichloro, 1,2,2-trifluoroethane solution by irradiation of the oxygen dimol 23∑-g→21δg transition with a pulsed dye laser and the 3∑g-→1δg+ lv transition with a continuous Nd-YAG laser. The rates of chemical reaction and physical quenching of singlet oxygen so generated has been measured for a series of substituted oxodipyrro-methenes. The results show that the oxodipyrromethenes react with singlet oxygen at rates comparable to that for 1,3-diphenylisobenzofuran. The rate of quenching of singlet oxygen by ground state oxygen has been measured to be 2.5±0.3 × 103 M-l s-1. |
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