期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 122, 期 13, 页码 3391-3397出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.8b01539
关键词
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资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2014R1A6A1030732, NRF-2017R1D1A3B03033085]
- International Science and Business Belt Program through the Ministry of Science and ICT [2017K000494]
We report the results of photoinduced electron transfer (PET) in a novel dyad, in which a boron dipyrromethene (BODIPY) dye is covalently linked to o-carborane (o-Cb). In this dyad, BODIPY and o-Cb act as electron donor and acceptor, respectively. PET dynamics were investigated using a femtosecond time-resolved transient absorption spectroscopic method. The free energy dependence of PET in the S-1, and S-2 states was examined on the basis of Marcus theory. PET in the S-1, state occurs in the Marcus normal region. Rates are strongly influenced by the driving force (-Delta G), which is controlled by solvent polarity; thus, PET in the S-1 state is faster in polar solvents than in nonpolar ones. However, PET does not occur from the higher energy S-2 state despite large endothermic Delta G values, because deactivation via internal conversion is much faster than PET.
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