Single molecule studies of calix[4]arene-linked perylene bisimide dimers: relationship between blinking, lifetime and/or spectral fluctuations.

Single molecule studies of calix[4]arene-linked perylene bisimide dimers: relationship between blinking, lifetime and/or spectral fluctuations.
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杯[4]芳烃连接的苝双酰亚胺二聚体的单分子研究:眨眼、寿命和/或光谱波动之间的关系

DOI:
10.1039/c2cp41250k
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发表时间:
2012
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
J. Köhler
J. Köhler
中科院分区:
--
文献类型:
--
作者:
A. Issac;R. Hildner;D. Ernst;C. Hippius;F. Würthner;J. Köhler

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我们记录了荧光时间的痕迹,同时无论是荧光寿命或发射光谱从单一的嵌在聚苯乙烯基质中的二聚体的?在这些痕迹中,可以区分三个不同的强度水平,这反映了一个二萘嵌苯亚基的光诱导的辐射。中性PBI和可逆形成的自由基阴离子之间的能量转移速率的差异引起强度水平出现的时间顺序的变化,这使我们能够将时间轨迹分为三个不同的组:类型1闪烁对应于高能量传输速率,类型2闪烁对应于大和小传输速率之间的波动(动态猝灭),和类型3闪烁的结果,从小的能量转移率与库仑阻塞。我们获得的信息,从分布的荧光寿命在不同的信号水平,使我们能够将这些差异的二聚体的本地聚合物环境的属性。
We recorded fluorescence time traces, and simultaneously either the fluorescence lifetime or the emission spectra from single perylene bisimide (PBI) dimers embedded in a polystyrene matrix. In these traces three distinct intensity levels can be distinguished, which reflect the photo-induced radicalisation of one of the perylene subunits. Differences in the energy transfer rate between the neutral PBI and the reversibly formed radical anion give rise to variations in the chronological order of the appearance of the intensity levels, which allowed us to categorise the time traces into three distinct groups: Type 1 blinking corresponds to a high energy transfer rate, type 2 blinking to fluctuations between large and small transfer rates (dynamic quenching), and type 3 blinking results from small energy transfer rates together with Coulomb blockade. The information that we obtain from the distributions of the fluorescence lifetimes at the various signal levels allows us to relate these differences to properties of the local polymer environment of the dimers.
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