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Role of Vibrational Dynamics on Excited-State Electronic Coherence in a Binuclear Platinum Complex

机译:振动动力学对瞳孔铂复合体兴奋状态电子相干的作用

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摘要

Long-lived quantum coherence between excited electronic states can enable highly efficient energy and charge transport processes in chemical systems. Recent pump-probe experiments on binuclear platinum complexes identified persistent, periodic beating of transient absorption anisotropy signals, indicating long excited-state coherence lifetimes. Our previous simulations of the electronic dynamics of these complexes indicate that coherence lifetimes are sensitive to the balance between competitive electronic couplings. The complexes with shorter Pt-Pt distances underwent no appreciable dephasing in the limit of static nuclei, motivating the inclusion of nuclear motion into our simulations. The tert-butyl-substituted complex is studied in this work using the Ehrenfest method for mixed quantum classical dynamics to investigate the role of vibrational dynamics on a complex shown to support coherence lifetimes. Results indicate that the inclusion of excited-state vibrations drives a rapid collapse of the two-state coherence prior to the experimentally determined intersystem crossing. This further suggests singlet excited-state coherences may not be prerequisites for long-lived triplet coherences.
机译:激发电子状态之间的长期量子相干性能能够在化学系统中实现高效的能量和电荷运输过程。最近的泵探针实验对双核铂复合物鉴定瞬态吸收各向异性信号的持续,周期性搏动,表明长期激发 - 状态相干寿命。我们之前的这些复合物的电子动力学模拟表明相干寿命对竞争性电子联轴器之间的平衡敏感。具有较短PT-PT距离的复合物在静态核的极限下没有明显的相当,激励核动作进入我们的模拟。在该作品中使用叔丁基取代的复合物使用混合量子经典动力学的EHEFEST方法研究了振动动力学在所示复合物中的作用,以研究支持一致寿命的复合物。结果表明,兴奋状态振动的包含在实验确定的交叉系统之前,在实验确定的界面交叉之前推动了两个状态相干性的快速崩溃。这进一步提出了单线兴奋状态一致性可能不是长寿命三重态一致性的先决条件。

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