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

被引：6
|
作者：
Shimokage, T [1 ]
Ikoma, T [1 ]
Akiyama, K [1 ]
Tero-Kubota, S [1 ]
机构：
[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan
来源：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2002年 / 58卷 / 06期
关键词：
time-resolved EPR; pulsed ENDOR; excited triplet states; naphthacenequinone;
D O I：
10.1016/S1386-1425(01)00710-7
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
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 (T,) 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 T, energy level and the D value of the zero-field splitting (ZFS) parameters only slightly decreased with the increasing pi-conjugated system. The T-1 states of these linear para-acenequinones were assigned to the pipi* character. In triplet 5,12-naphthacenequinone, more than 80% of the unpaired electron spins are localized on the naphthalene aromatic sub-system. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：1201 / 1208
页数：8
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