Effect of Deuteration on Relaxation Dynamics of the Perylene Excimer Studied by Subnanosecond Transient Absorption Spectroscopy
Effect of Deuteration on Relaxation Dynamics of the Perylene Excimer Studied by Subnanosecond Transient Absorption Spectroscopy
复制标题
亚纳秒瞬态吸收光谱研究氘化对苝准分子弛豫动力学的影响
DOI：
10.1021/acs.jpca.0c10683
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发表时间：
2021
期刊：
影响因子：
2.9
通讯作者：
Ryuzi Katoh
中科院分区：
文献类型：
--
作者：
Yuuya Shibasaki;Tomoyoshi Suenobu;Tatsuo Nakagawa;Ryuzi Katoh
利用基于随机交错脉冲序列方法的亚纳秒时间分辨瞬态吸收光谱研究了氘代对溶液中苝激基缔合物弛豫动力学的影响。我们发现，在溶液中的氘代的准分子有一个更长的寿命比未氘化的准分子，但氘化有一点影响的基态和瞬态吸收光谱的准分子，这表明氘化改变的弛豫动力学诱导振动性质的微小变化。为了证实氘化效应的起源，我们定量分析了瞬态吸收衰减的动力学，包括三重态-三重态吸收的衰减。此外，我们评估了温度对准分子寿命的影响。根据这些结果，我们得出结论，内转换率被抑制的氘化。通过比较我们的研究结果与以前报道的结果上的氘化结晶的荧光性质的影响，我们提出了一个模型，可以解释的氘化的影响，在溶液中的？准分子的寿命。
We studied the effect of deuteration on the relaxation dynamics of the excimer of perylene in solution using subnanosecond time-resolved transient absorption spectroscopy based on the randomly interleaved pulse-train method. We found that the deuterated perylene excimer in solution had a longer lifetime than the undeuterated excimer but that deuteration had a little effect on the ground-state and transient absorption spectra of the excimer, suggesting that deuteration altered the relaxation dynamics by inducing small changes in vibrational properties. To confirm the origin of the deuteration effect, we quantitatively analyzed the kinetics of transient absorption decay, including the decay of triplet–triplet absorption. In addition, we evaluated the effects of temperature on the lifetime of the excimers. On the basis of these results, we concluded that the rate of internal conversion was suppressed by deuteration. By comparing our results with previously reported results on the effect of deuteration on the fluorescence properties of crystalline perylene, we proposed a model that may explain the effect of deuteration on the lifetime of the perylene excimer in solution.