当前位置: X-MOL 学术Photochem. Photobiol. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Femtosecond excited state dynamics of stilbene-viologen complexes with a weakly pronounced charge transfer.
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2020-07-23 , DOI: 10.1039/d0pp00034e
Mikhail V Rusalov 1 , Valery V Volchkov 1 , Vladimir L Ivanov 1 , Mikhail Ya Melnikov 1 , Fedor E Gostev 2 , Ivan V Shelaev 2 , Victor A Nadtochenko 1, 2 , Artem I Vedernikov 3 , Sergey P Gromov 1, 3 , Michael V Alfimov 3
Affiliation  

The femtosecond dynamics of photoinduced electron transfers in supramolecular donor–acceptor complexes between (E)-bis(18-crown-6)stilbene (D) and tetraperchlorates of 2,7-di(2-ammonioethyl)(2,7-diazapyrenium) (A1), 3,3′-(E)-ethene-1,2-diylbis[1-(3-ammoniopropyl)pyridinium] (A2) and 4,4′-ethane-1,2-diylbis[1-(3-ammoniopropyl)pyridinium] (A3) was studied. The acceptors A2 and A3 are weak electron acceptors whose first reduction potentials are equal to −1.0 and −1.2 V (Ag), respectively, while A1 is a strong acceptor with a reduction potential of −0.42 V. It was shown that the back electron transfer time in CT-states of the complexes D·A2 and D·A3 is 30–40 ps, which is approximately 50 times greater than the analogous time for the charge transfer complexes studied earlier. The complex D·A1 is characterized by ultrafast back electron transfer (770 fs). The relaxation pathway of excited states of D·A1 depends on the wavelength of the excitation light. When excited at 356 nm, the accumulation of a transient locally excited (LE) state with a 250 fs lifetime was observed. But when excited at 425 nm, the formation of the LE-state was not observed.

中文翻译:

飞秒激发态的二苯乙烯-紫精复合物的态动力学,电荷转移较弱。

E)-双(18-冠-6)-6(D)与2,7-二(2-氨乙基)(2,7-二氮杂re)的四高氯酸盐之间的超分子供体-受体配合物中的光诱导电子转移的飞秒动力学(A1),3,3'-(E)-乙烯-1,2-二基双[1-(3-氨丙基)吡啶](A2)和4,4'-乙烷-1,2-二基双[1-( 3- ammoniopropyl)吡啶鎓](A3)进行了研究。受体A2A3是弱电子受体,其第一还原电位分别等于-1.0和-1.2 V(Ag),而A1是复合物D·A2D·A3在CT态下的强电子受体,还原电位为-0.42V。这表明复合物D·A2D·A3在CT态下的反向电子转移时间为30–40 ps,约为电子的电荷转移配合物的类似时间已在前面进行了研究。配合物D·A1的特征在于超快的反向电子转移(770 fs)。D·A1的激发态的弛豫路径取决于激发光的波长。当在356 nm激发时,观察到寿命为250 fs的瞬态局部激发(LE)状态的积累。但是当在425 nm激发时,未观察到LE态的形成。
更新日期:2020-09-16
down
wechat
bug