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Femtosecond excited state dynamics of a stilbene–viologen charge transfer complex assembled via host–guest interaction
Photochemical & Photobiological Sciences ( IF 3.1 ) Pub Date : 2017-10-19 00:00:00 , DOI: 10.1039/c7pp00170c
Mikhail V. Rusalov 1, 2, 3, 4 , Valery V. Volchkov 1, 2, 3, 4 , Vladimir L. Ivanov 1, 2, 3, 4 , Mikhail Ya. Melnikov 1, 2, 3, 4 , Ivan V. Shelaev 3, 4, 5, 6 , Fedor E. Gostev 3, 4, 5, 6 , Victor A. Nadtochenko 1, 2, 3, 4, 5 , Artem I. Vedernikov 4, 6, 7, 8 , Sergey P. Gromov 1, 2, 3, 4, 7 , Michael V. Alfimov 4, 6, 7, 8
Affiliation  

The dynamics of the excited states of a supramolecular complex with a charge transfer between (E)-bis(18-crown-6)stilbene and 4,4′-(E)-ethene-1,2-diylbis[1-(2-ammonioethyl)pyridinium]tetraperchlorate was studied by means of femtosecond transient spectroscopy. It is found that the characteristic time of the conversion of the locally excited (LE) state into the charge transfer (CT) state is equal to 300 fs, whereas the characteristic time of the conversion of the CT state into the ground state is equal to 400 fs. Due to host–guest interaction involving hydrogen bonds, the complex possesses high thermodynamic stability. As a result of ultrafast photoinduced processes of the direct and back electron transfer, the complex does not fluoresce. Upon the interaction of the complex with alkaline-earth metal cations, “switch-on” of its fluorescence occurs.

中文翻译:

通过主体-客体相互作用 组装的二苯乙烯-紫罗兰色电荷转移复合物的飞秒激发态动力学

超分子配合物在(E)-双(18-冠-6)二苯乙烯与4,4'-(E之间的电荷转移飞秒瞬态光谱法研究了)-乙烯-1,2-二基双[1-(2-氨乙基)吡啶鎓]四氯酸盐。发现局部激发(LE)状态转变为电荷转移(CT)状态的特征时间等于300fs,而CT状态转变为基态的特征时间等于300fs。 400英尺 由于主体与客体之间的相互作用涉及氢键,因此该配合物具有很高的热力学稳定性。由于正电子和反电子转移的超快光诱导过程,该复合物不会发荧光。在配合物与碱土金属阳离子相互作用后,其荧光发生“开启”。
更新日期:2017-10-19
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