The impact of the π-electron conjugation length on the three-photon absorption cross section of fluorene derivatives

Ion Cohanoschi, Kevin D. Belfield, Carlos Toro, Sheng Yao, Florencio E. Hernández

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18 Scopus citations

Abstract

The three-photon absorption cross sections of three different fluorene derivatives, with extended π -electron conjugation lengths was experimentally measured and compared with shorter π -electron conjugation length analogs. The effect of the conjugation length on the three-photon absorption cross section σ3′ of this family of molecules has been elucidated. It is demonstrated that σ3′ of the asymmetric compound D-π -π -π -A is 6.6 times larger than its shorter configuration D-π -A, while for the symmetric compounds D-π -π -π -D and A-π -π -π -A a two-fold enhancement was found relative to their shorter conjugation length analogs. Measurements of the three-photon excitation of these compounds in THF solution (10-3 M) were accomplished with a tunable optical pulse generation pumped by a 25 ps Nd-YAG laser.

Original languageEnglish (US)
Article number194707
JournalJournal of Chemical Physics
Volume124
Issue number19
DOIs
StatePublished - May 21 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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