Time-dependent density functional theory investigation of electric field effects on absorption spectra of meso - Meso-linked zinc porphyrin arrays: Role of charge-transfer states

Katsunori Nakai, Riadh Sahnoun, Tsuyoshi Kato, Hirohiko Kono, Yuichi Fujimura

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

By using time-dependent density functional theory, we calculated the transition energies of a zinc porphyrin monomer and its meso-meso-linked arrays. In line with the prediction of the molecular exciton model, the calculated splitting energy of the Soret band increased as the number of linked porphyrins increased. We then examined how the transition energies of the dimer array were shifted by an applied electric field. For reproduction of an electroabsorption spectrum (EA), i.e., the field-induced change in absorption intensity, a model Hamiltonian constructed from five states is proposed. It is concluded for the dimer that the field-induced coupling between the lower-energy Soret band Se and the lower-lying ionic character (charge-transfer) states is responsible for the experimentally observed blue shift of Se as well as the second-derivative profile in the EA spectrum.

Original languageEnglish
Pages (from-to)13921-13927
Number of pages7
JournalJournal of Physical Chemistry B
Volume109
Issue number29
DOIs
Publication statusPublished - 2005 Jul 28

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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