Solvent Controlled Energy Transfer Processes in Triarylamine-Triazole Based Dendrimers
Solvent Controlled Energy Transfer Processes in Triarylamine-Triazole Based Dendrimers
复制标题
三芳胺-三唑基树枝状聚合物中溶剂控制的能量转移过程
DOI：
10.1021/jp404708x
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发表时间：
2013
影响因子：
3.7
通讯作者：
C. Lambert
中科院分区：
文献类型：
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作者：
Fabian Zieschang;A. Schmiedel;M. Holzapfel;Kay Ansorg;B. Engels;C. Lambert
三种不同的树枝状聚合物G1-G3的荧光上转换测量基于三唑连接基连接的三芳基胺，显示了一个强大的和快速的初始衰减的荧光各向异性的t < 2 ps，然后在一个更长的时间尺度上的各向异性衰减（10-100 ps）。同时，发生明显的溶剂松弛。在不同溶剂中的衰减数据的比较表明，荧光各向异性的初始衰减是由不同的树枝状大分子分支之间的溶剂弛豫和不相干跳跃的能量的竞争。因此，它是决定性的区别在弗兰克-康登状态或溶剂松弛状态的能量转移过程。我们证明，即使是电荷转移发色团，其中一个大的斯托克斯位移导致非常弱的光谱重叠的供体荧光和受体吸收，快速homotransfer是可能的，如果有足够的光谱重叠的时间为零的荧光光谱。
Fluorescence upconversion measurements of three different dendrimers G1–G3 based on triarylamines connected by triazole linkers show a strong and fast initial decay of fluorescence anisotropy for t < 2 ps followed by anisotropy decay on a much longer time scale (10–100 ps). At the same time, a pronounced solvent relaxation takes place. Comparison of the decay data in different solvents revealed that the initial decay of fluorescence anisotropy is governed by a competition of solvent relaxation and incoherent hopping of energy between the different dendrimer branches. Thus, it is decisive to discriminate between energy transfer processes in the Franck–Condon state or in the solvent relaxed state. We demonstrate that even for charge transfer chromophores, where a large Stokes shift leads to very weak spectral overlap of donor fluorescence and acceptor absorption, rapid homotransfer is possible if there is sufficient spectral overlap with the time zero fluorescence spectrum.
影响因子：
3.6
作者：
Lambert, Christoph;Ehbets, Julia;Steeger, Markus
通讯作者：
Steeger, Markus
影响因子：
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作者：
Jianhua Xu;J. Knutson
通讯作者：
Jianhua Xu;J. Knutson