Light harvesting subphthalocyanine-ferrocene dyads: Fast electron transfer process studied by femtosecond laser photolysis

Mohamed E. El-Khouly, Maged A. El-Kemary, Ahmed El-Refaey, Kwang Yol Kay, Shunichi Fukuzumi

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Ferrocene-subphthalocyanine dyads characterized, where ferrocene is axially linked with subphthalocyanine at its axial position with the B-O bond through the para and metapositions, namely Fc-pPhO-SubPc (dyad 1) and Fc-mPhO-SubPc (dyad 2). The geometric and electronic structures of 1 and 2 were probed by ab initio B3LYP/6-311G methods. The optimized structures showed that the Fc and SubPc entities are separated by 8.42 and 7.40 Å for dyads 1 and2, respectively. The distribution of the highest occupied frontier molecular orbital (HOMO) was found to be located on the Fc entity, while the lowest unoccupied molecular orbital (LUMO) was located on the SubPc entity, suggesting that the charge-separated states of the are Fc+-SubPc•-. Upon photoexcitation at the subphthalocyanine unit, both dyads undergo photoinduced electron transfer to form the corresponding charge-separated species, Fc+-SubPc•-. Based on their redox potentials determined by cyclic voltammetry technique, the direction of the charge separation and the energies of these states have been revealed. Femtosecond transient spectroscopic studies have revealed that a fast charge separation of 8.8 × 1010 and 1.2 × 1011 s-1 for 1 and 2, respectively, indicating fast charge separation in these simple dyads.

Original languageEnglish
Pages (from-to)1148-1155
Number of pages8
JournalJournal of Porphyrins and Phthalocyanines
Issue number8-11
StatePublished - 1 Aug 2016

Bibliographical note

Funding Information:
This project was supported financially by the Science and Technology Development Fund (STDF), Egypt (Grant Numbers 5537 and 12436) and Grants-in-Aid from JSPS (no. 16H02268 to S.F.).

Publisher Copyright:
© 2016 World Scientific Publishing Company.


  • electron transfer
  • ferrocene
  • laser photolysis
  • Subphthalocyanine


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