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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Conformational Dynamics of Semiflexibly Bridged Donor-Acceptor Systems Studied with a Streak Camera and Spectrotemporal Parametrization of Fluorescence
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Conformational Dynamics of Semiflexibly Bridged Donor-Acceptor Systems Studied with a Streak Camera and Spectrotemporal Parametrization of Fluorescence

机译：条纹相机研究半柔性桥供体-受体系统的构象动力学和荧光的光谱时态参数化

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摘要

The fluorescence of four semiflexibly bridged donor-bridge-acceptor systems was studied with a streak camera system. The information-rich streak data make a detailed analysis possible of both the kinetics and the spectral changes that take place. From the analysis, it follows that all compounds studied undergo a photoinduced harpooning process in which long-range electron transfer creates an extended charge-transfer (ECT) species, which converts to a compact charge-transfer (CCT) species due to Coulombic attraction. Both the ECT and CCT species display CT fluorescence. The harpooning process occurs even in solvents of medium polarity (e.g., diethyl ether), whereas it has previously been assumed for related compounds that this process only occurs in the gas phase and in nonpolar alkane solvents.
机译：用条纹相机系统研究了四个半挠性桥供体-桥-受体系统的荧光。信息丰富的条纹数据使动力学和光谱变化的详细分析成为可能。从分析中可以得出结论，所有研究的化合物都经历了光诱导鱼叉的过程，在该过程中，远程电子转移产生了扩展的电荷转移（ECT）物种，由于库仑吸引作用，其转换为紧凑的电荷转移（CCT）物种。 ECT和CCT物种均显示CT荧光。甚至在中等极性的溶剂（例如乙醚）中也发生了鱼叉过程，而以前已经假定相关化合物该过程仅在气相和非极性烷烃溶剂中发生。

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