Add time:08/12/2019         Source:sciencedirect.com

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.

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