Efficient charge separation in Li+@C60 supramolecular complexes with electron donors

Yuki Kawashima, Kei Ohkubo, Shunichi Fukuzumi

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17 Scopus citations


Lithium-ion-encapsulated fullerene (Li+@C60) exhibits greatly enhanced reactivity in photoinduced electrontransfer reduction with electron donors compared with pristine C60. The enhanced reactivity of Li+@C60 results from the more positive one-electron reduction potential of Li+@C60 (+0.14 V versus a standard calomel electrode (SCE)) than that of C60 (-0.43 V versus SCE), whereas the reorganization energy of electron transfer of Li+@C60 (1.01 eV) becomes larger than that of C60 (0.73 eV) because of the change in electrostatic interactions of encapsulated Li+ upon electron transfer. Li+@C60 can form strong supramolecular complexes with various anionic electron donors through electrostatic interactions. Li+@C60 can also form strong supramolecular π complexes with various electron donors, such as cyclic porphyrin dimers, corannulene, and crown ether fused monopyrrolotetrathiafulvalenes. Photoinduced electron transfer from electron donors to Li+@C60 afforded long-lived chargeseparated states of supramolecular complexes between electron donors and Li+@C60. A photoelectrochemical solar cell composed of supramolecular nanoclusters of Li+@C60 and zinc sulfonated meso-tetraphenylporphyrin exhibits significant enhancement in the photoelectrochemical performance than that of the reference system containing only a single component.

Original languageEnglish
Pages (from-to)45-54
Number of pages10
JournalChemistry - An Asian Journal
Issue number1
StatePublished - Jan 2015

Bibliographical note

Publisher Copyright:
© 2015 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.


  • Electron transfer
  • Fullerenes
  • Lithium
  • Photochemistry
  • Supramolecular chemistry


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