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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Intramolecular Directional Energy Transfer Processes in Dendrimers Containing Perylene and Terrylene Chromophores
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Intramolecular Directional Energy Transfer Processes in Dendrimers Containing Perylene and Terrylene Chromophores

机译：含有Per和三甲苯发色团的树枝状分子的分子内定向能量转移过程

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摘要

The time-resolved fluorescence kinetics of a first and a second generation dendrimer with peryleneimide chromophores at the rim and a terrylenediimide chromophore in the core were investigated using femtosecond fluorescence upconversion and single photon timing techniques. By global analysis of an extentensive data set with λ_(em) ranging from 540 to 780 nm, combining both techniques and comparing the kinetic results obtained previously for peryleneimide and terrylenediimide reference compounds, two independent energy transfer processes could be identified. The time constants were 4 and 25 ps for the first generation dendrimer and 22 and 68 ps for the second generation, respectively. They scale as expected for Forster energy transfer processes between chromophores at the distances present in the dendrimers. Each of these processes can possibly be related to different isomers present in the samples. Analysis of the in-the-bay area substituted terrylenediimide model compound reveals subsets of molecules showing different relaxation pathways of the terrylene core.
机译：使用飞秒荧光上转换和单光子定时技术研究了第一和第二代树枝状聚合物的时间分辨荧光动力学，所述第一和第二树状聚合物在边缘具有per酰亚胺酰亚胺发色团并且在核心中具有三萘嵌二酰亚胺发色团。通过对λ_（em）在540 nm至780 nm之间的范围广泛的数据集进行整体分析，结合两种技术并比较先前获得的per酰亚胺和Terrylenediimide参考化合物的动力学结果，可以确定两个独立的能量转移过程。第一代树状聚合物的时间常数分别为4和25 ps，第二代树状聚合物的时间常数分别为22和68 ps。它们按树状聚合物中存在的距离对发色团之间的Forster能量转移过程进行了预期的缩放。这些过程中的每一个都可能与样品中存在的不同异构体有关。海湾区域内被取代的三甲苯二酰亚胺模型化合物的分析揭示了分子的子集，这些分子显示出三甲苯核心的不同弛豫途径。

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