Efficient Intramolecular Vibrational Excitonic Energy Transfer in Ru3(CO)12 Cluster Revealed by Two-Dimensional Infrared Spectroscopy,The Journal of Physical Chemistry B

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Efficient Intramolecular Vibrational Excitonic Energy Transfer in Ru3(CO)12 Cluster Revealed by Two-Dimensional Infrared Spectroscopy
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2018-01-11 00:00:00 , DOI: 10.1021/acs.jpcb.7b10067
Xueqian Dong _{1,

2} , Fan Yang ₁ , Juan Zhao _{1,

2} , Jianping Wang _{1,

2}

Affiliation

Trinuclear transition-metal carbonyl complex dodecacarbonyl triruthenium (Ru₃(CO)₁₂) is considered as one of the paradigms in cluster chemistry, which plays an important role in photocatalysis, photoenergy conversion, and synthetic chemistry. Due to structural symmetry (D_3h point group), 12 carbonyl (C≡O) groups in the Ru₃(CO)₁₂ complex contribute to mainly three excitonic carbonyl stretching modes: E′ (radial), A₂″ (axial), and E′ (axial). In this work, efficient intramolecular vibrational energy redistribution (IVR) processes among the three modes in this Ru–CO complex were observed to occur on the time scale of tens of picoseconds. The IVR processes were characterized in detail using a kinetic model and fitting to the waiting-time-dependent diagonal and off-diagonal signals of ultrafast two-dimensional infrared spectroscopy. In addition, the diagonal anharmonicities of the three C≡O stretching modes were determined to be quite close to one another, and the coupling-induced cross peaks were invariant because this Ru₃(CO)₁₂ cluster does not show picosecond fluxionality and hence their contributions were neglected in modeling the IVR processes. Our results provide a benchmark for understanding the excitonic nature of the vibrational excited states of the carbonyl vibrators and the associated efficient vibrational energy-flow pathways, in such multicentered transition-metal complexes, which are of key importance to their functions.

中文翻译：

二维红外光谱揭示Ru ₃（CO）₁₂团簇中的高效分子内振动激子能量转移

三核过渡金属羰基络合物十二碳三钌（Ru ₃（CO）₁₂）被视为簇化学的范例之一，在光催化，光能转化和合成化学中起着重要的作用。由于结构对称性（D _{3 h}点基团），Ru ₃（CO）₁₂络合物中的12个羰基（C≡O）基主要贡献了三种激子羰基拉伸方式：E'（径向），A ₂”（轴向）和E'（轴向）。在这项工作中，观察到该Ru-CO络合物的三种模式之间的有效分子内振动能重新分配（IVR）过程发生在数十皮秒的时间尺度上。使用动力学模型对IVR过程进行了详细表征，并拟合了超快二维红外光谱的等待时间相关的对角线和非对角线信号。另外，确定了三种C≡O拉伸模式的对角非谐性非常接近，并且耦合诱导的交叉峰是不变的，因为这种Ru ₃（CO）₁₂聚类没有显示皮秒的通量，因此在IVR过程建模中忽略了它们的贡献。我们的结果为理解此类多中心过渡金属络合物中羰基振动器的振动激发态的激子性质及其相关的有效振动能流路径提供了一个基准，这对它们的功能至关重要。

更新日期：2018-01-11

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