Linker-Dependent Singlet Fission in Tetracene Dimers
作者:Nadezhda V. Korovina、Jimmy Joy、Xintian Feng、Cassidy Feltenberger、Anna I. Krylov、Stephen E. Bradforth、Mark E. Thompson
DOI:10.1021/jacs.8b04401
日期:2018.8.15
meta- and para-bis(ethynyltetracenyl)benzene dimers that are analogues to the ortho-bis(ethynyltetracenyl)benzene dimer reported by our groups previously. A comparison of the excited-state properties of these dimers allows us to investigate the effects of electronic conjugation and coupling on singlet fission between the ethynyltetracene units within a dimer. In the para isomer, in which the two chromophores
Singlet Fission in a Covalently Linked Cofacial Alkynyltetracene Dimer
作者:Nadezhda V. Korovina、Saptaparna Das、Zachary Nett、Xintian Feng、Jimmy Joy、Ralf Haiges、Anna I. Krylov、Stephen E. Bradforth、Mark E. Thompson
DOI:10.1021/jacs.5b10550
日期:2016.1.20
film of BET-B with high efficiency (triplet yield: 154%). In solution and the PMMA matrix the S1 of BET-B relaxes to a correlated triplet pair (1)(T1T1) on a time scale of 2 ps, which decays to the groundstate without forming separated triplets, suggesting that triplet energy transfer from (1)(T1T1) to a nearby chromophore is essential for producing free triplets. In support of this hypothesis, selective
Synthesis and photophysical properties of a bistetracene compound with slipped stacked structure
作者:Heyuan Liu、Xuemin Wang、Lingyun Pan、Li Shen、Xiangyang Wang、Qidai Chen、Xiyou Li
DOI:10.1016/j.jphotochem.2017.03.006
日期:2017.5
A bistetracene compound, composed of a tetracene (Tc) subunit and a diphenyltetracene (DPT) subunit linked by a xanthene bridge, has been prepared. Its molecular structure is characterized by 1H NMR, MALDI-TOF mass spectroscopy and elemental analysis. The bistetracene takes a “face-to-face” stacked conformation with a large displacement along the short axis of the tetracene skeleton. The absorption
制备了由并四苯(Tc)亚基和通过x吨桥连接的二苯基并四苯(DPT)亚基组成的双硬脂环化合物。其分子结构特征为11 H NMR,MALDI-TOF质谱和元素分析。Bistetracene呈“面对面”的堆叠构型,沿着并四苯骨架的短轴位移很大。双十八烷的吸收光谱与它们的单体对应物的吸收光谱相同,这表明两个亚基之间的基态相互作用较弱。由于从Tc到DPT的超快分子内单重态-单重态能量转移,双十八烷的荧光主要由DPT亚基的发射决定。在该双硬脂烷上研究的瞬态吸收光谱表明,能量转移的时间常数为0.32 ps,对应的速率为3.13×10 12 s -1类似于自然光合作用的LH II中从B800到B850的超快速能量转移。这种超快速和有效的能量转移成功地阻止了Tc的单重激发态的无用非放射性衰变,并以100%的效率将Tc的激发能存储为DPT的单重激发态。
Evidence for exciton fission and fusion in a covalently linked tetracene dimer
作者:Astrid M. Müller、Yuri S. Avlasevich、Klaus Müllen、Christopher J. Bardeen
DOI:10.1016/j.cplett.2006.01.117
日期:2006.4
A photophysical study of the covalently linked tetracenedimer 1,4-bis(tetracen-5-yl)benzene is presented. While the dimer’s steady state spectroscopy is similar to that of monomeric tetracene, it also exhibits a long-lived fluorescence signal in solution and solid polyethylene films, which is absent in the monomer. The behavior of this long-lived component as a function of temperature and oxygenation
Synthesis and photophysical properties of a single bond linked tetracene dimer
作者:Tingting Sun、Li Shen、Heyuan Liu、Xuan Sun、Xiyou Li
DOI:10.1016/j.molstruc.2016.03.048
日期:2016.7
excited state of this dimer is delocalized on both two tetracene subunits, which is significantly different from that of orthogonal anthracene dimers, but similar with that observed for orthogonal pentacene dimer. Most of the excited states of this dimer decay by radioactive channels, which is different from the localized twisted charge transfer state (LTCT) channel of anthracene dimers and the singlet fission