A molecular tetrad allowing efficient energy storage for 1.6 s at 163 K

Dirk M. Guldi, Hiroshi Imahori, Koichi Tamaki, Yukiyasu Kashiwagi, Hiroko Yamada, Yoshiteru Sakata, Shunichi Fukuzumi

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In a novel molecular ferrocene-zinc porphyrin-zinc porphyrin-fullerene (Fc-ZnP-ZnP-C60) tetrad, the longest lifetime of a charge-separated state ever reported in an artificial photosynthetic reaction center (1.6 s n DMF at 163 K) has been attained. This lifetime is comparable, for example, to the lifetime (∼1 s) of the bacteriochlorophyll dimer radical cation ((Bchl)2̇+)-secondary quinone radical anion (QḂ-) ion pair in the bacterial photosynthetic reaction centers. The present far distant radical ion pair is formed with a quantum yield of 34%. The radical ion pair Fc+-ZnP-ZnP-C60̇- produced by photoinduced electron transfer was detected by means of transient absorption spectra as well as ESR spectra. Both the lifetime and the quantum yield of the final charge-separated state are improved in Fc-ZnP-ZnP-C60 relative to the corresponding ferrocene-zinc porphyrin-free base porphyrin-fullerene (Fc-ZnP-H2P-C60) tetrad.

Original languageEnglish
Pages (from-to)541-548
Number of pages8
JournalJournal of Physical Chemistry A
Issue number4
StatePublished - 29 Jan 2004


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