Related Experiment Video
Updated: Feb 22, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
Electronic structure of the lowest excited triplet state of 5,12-naphthacenequinone
Takuji Shimokage1, Tadaaki Ikoma, Kimio Akiyama
1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan.
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 (Tl) 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 Tl energy level and the D value of the zero-field splitting (ZFS) parameters only slightly decreased with the increasing pi-conjugated system. The Tl states of these linear para-acenequinones were assigned to the pi pi* character. In triplet 5,12-naphthacenequinone, more than 80% of the unpaired electron spins are localized on the naphthalene aromatic sub-system.
More Related Videos
06:08Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
12:07Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
Published on: April 1, 2013
Related Concept Videos
Aromatic Hydrocarbon Cations: Structural Overview
Removing one hydrogen from the intervening CH2 group...
UV–Vis Spectroscopy: Molecular Electronic Transitions
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Deactivation Processes: Jablonski Diagram
Structure of Benzene: Molecular Orbital Model
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals