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Temperature dependence of photoinduced electron transfer within self-associated porphyrin: guanine monophosphate complexes |
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| Authors: | Ravi Jasuja Theodore L Hazlett Michael K Helms Suk-Hyung Lee David M Jameson Randy W Larsen |
| Institution: | a Department of Chemistry, University of Hawaii-Manoa, 2545 McCarthy Mall, Honolulu, HI 96822, USA b Laboratory for Fluorescence Dynamics, Physics Department, University of Illinois-Urbana/Champaign, Urbana, IL 61801, USA c Department of Cell and Molecular Biology, University of Hawaii, Honolulu, HI 96822, USA d Department of Chemistry, University of Guam, Agana, Guam |
| Abstract: | In the current report, the temperature dependence of photoinduced electron transfer between tetrakis-(4-tetramethylpyridyl)porphine (T4MPyP) and guanine monophosphate (GMP) has been examined. In the presence of GMP the fluorescence lifetime analysis reveals a Lorentzian distribution of lifetimes centered at 0.7 ns with a width of 0.9 ns displaying significant temperature dependence. Fitting temperature dependent data to the Marcus equation gives a reorganizational energy (λ) for the electron transfer reaction of 0.6 eV and an electronic coupling factor (HAB) of 3×10?3 eV. These results suggest conformational regulation of electron transfer within the non-covalent porphyrin:nucleotide complex. |
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