Electronic structure of the lowest excited triplet state of 5,12-naphthacenequinone

Takuji Shimokage, Tadaaki Ikoma, Kimio Akiyama, Shozo Tero-Kubota

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Continuous-wave time-resolved EPR (cw-TREPR) and pulsed electron nuclear double resonance (ENDOR) studies have been carried out to clarify the electronic structure of the lowest excited triplet (T1) state of 5,12-naphthacenequinone (5,12-NpQ) as well as 1,4-anthraquinone (1,4-AQ) and 6,13-pentacenequinone (6,13-PeQ). The T1 energy level and the D value of the zero-field splitting (ZFS) parameters only slightly decreased with the increasing π-conjugated system. The T1 states of these linear para-acenequinones were assigned to the ππ* character. In triplet 5,12-naphthacenequinone, more than 80% of the unpaired electron spins are localized on the naphthalene aromatic sub-system.

Original languageEnglish
Pages (from-to)1201-1208
Number of pages8
JournalSpectrochimica Acta - Part A Molecular and Biomolecular Spectroscopy
Volume58
Issue number6
DOIs
Publication statusPublished - 2002

Keywords

  • Excited triplet states
  • Naphthacenequinone
  • Pulsed ENDOR
  • Time-resolved EPR

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Spectroscopy

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