Real-time observation of interfragment vibration and charge transfer within the TCNQF4 dimer

Sena Hashimoto, Atsushi Yabushita, Izumi Iwakura*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The organic electron acceptors, 7,7,8,8-tetracyanoquinodimethane (TCNQ) and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (TCNQF4), are widely used to synthesize multivalent charge-transfer complexes. Their corresponding radical anion complexes have specific electronic, optical, and magnetic characters that have attracted attention in the field of materials development. In the present work, we have performed time-resolved absorption spectroscopy of the (Na+)2(TCNQF4[rad]−)2 radical anion complex to elucidate the reaction dynamics ([TCNQF4[rad]−]2 → TCNQF4 + TCNQF42−). A visible sub-10 fs laser pulse was used to observe the ultrafast dynamics of the charge transfer and real-time change of the molecular structure during the reaction. Unlike our previous work on the (Na+)2(TCNQ[rad]−)2 radical anion complex, the interfragment vibrational mode was clearly observed for (Na+)2(TCNQF4[rad]−)2. The difference in the intermolecular interaction is considered to reflect the difference in the π-π interaction and/or the difference in the flexibility of the molecular plane predicted by theoretical calculations.

Original languageEnglish
Pages (from-to)56-60
Number of pages5
JournalChemical Physics
Volume493
DOIs
StatePublished - 17 Aug 2017

Keywords

  • Absorption spectroscopy
  • Photo-dissociation
  • Sub-10 fs pulse laser
  • TCNQF
  • Ultrafast spectroscopy

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