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"50-fs Photoinduced Intramolecular Charge Separation in Triphenylmethane Lactones" T. Bizjak, J. Karpiuk, S. Lochbrunner, and E. RiedleJ. Phys. Chem. A 108, 10763 - 10769 (2004) Abstract: Upon excitation of their structural subunits, phenolphthalein and malachite green lactone un-dergo ultrafast intramolecular charge separation with formation of a long-lived charge transfer state (intramolecular "radical ion pair"). The kinetics of the primary charge separation in these molecules in aprotic solvents has been studied using fs pump-probe spectroscopy. The phenol radical cation is formed by electron transfer within 50 fs after excitation of phenolphthalein to the S1 state. In malachite green lactone both S2 → S1 electronic relaxation and charge separation are completed within 150 fs. The results demonstrate that electron transfer in these molecules occurs faster than the time scale of inertial solvation dynamics. An intramolecular vibrational mode to promote charge separation is indicated. BMO authors (in alphabetic order): Tanja Bizjak Stefan Lochbrunner Eberhard Riedle |
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Letzte Änderung: 2016-09-14 13:34
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