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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photophysical and Protonation Time Resolved Studies of Donor-Acceptor Branched Systems With Pyridine Acceptors
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Photophysical and Protonation Time Resolved Studies of Donor-Acceptor Branched Systems With Pyridine Acceptors

机译：用吡啶受体的供体 - 受体支化系统解决的光物理和质子化时间分辨研究

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摘要

A comparative study of the photophysical properties of octupolar pyridyl-terminated triphenylamine molecule, with its quadrupolar and dipolar analogues, by means of ambient and low temperature steady state spectroscopy and femtosecond to nanosecond time-resolved fluorescence spectroscopy is reported. The push-pull molecules bear triphenylamine electron donating core, pyridine peripheral electron acceptors, and acetylene pi-bridge. The samples were studied in solvents of varying polarity and also upon addition of small amounts of acetic acid to induce protonation of the pyridine group. All samples exhibit significant positive fluorescence solvatochromism as well as a relaxation of their excited state to a solvent relaxed intramolecular charge transfer state on the picosecond time scale. For the octupolar compound, excited state relaxation occurs simultaneously with excitation energy hopping among the branches. The hopping time is solvent polarity controlled since it becomes slower as the polarity increases. The experimental hopping times are compared to those predicted by Forster and Fermi formulations. The samples are capable of emitting broadband light covering almost the whole visible spectrum by careful control of protonation. Energy transfer from the neutral toward the protonated species on the 1 ps time scale is revealed.
机译：据报道，借助于环境和低温稳态光谱和飞秒至纳秒时间分辨荧光光谱的八吡吡吡吡吡酰基封端的三苯胺分子的光物理性质的对比研究。推拉分子承受三苯胺电子提供核心，吡啶外周电子受体和乙炔PI桥。在不同极性的溶剂中研究样品，并且在加入少量乙酸后，诱导吡啶基团的质子化。所有样品都表现出显着的正荧光溶剂溶解度，以及在浅秒钟尺度上以溶剂松弛的分子内电荷转移状态弛豫其激发态。对于八瓜棒糖化合物，激发状态松弛在分支中的激发能量跳跃时同时发生。跳跃时间是溶剂极性控制，因为随着极性增加而变得慢。将实验跳跃时间与Forster和Fermi制剂预测的那些。通过仔细控制质子化，样品能够发射几乎整个可见光谱的宽带光。揭示了从中性朝向质子化物种的能量转移。

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