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Predicting the Photoelectron Spectra of Quasi Octahedral Al6Mo- Cluster.
ChemistryOpen ( IF 2.5 ) Pub Date : 2020-05-04 , DOI: 10.1002/open.202000079
Paulo H Acioli 1
Affiliation  

We have recently developed a computational methodology to separate the effects of size, composition, symmetry and fluxionality in explaining the experimental photoelectron spectra of mixed‐metal clusters. This methodology was successfully applied first in explaining the observed differences between the spectra of Al13 and Al12Ni and more recently to explain the measured spectra of AlnMo, n=3–5,7 clusters. The combination of our approach and new synthesis techniques can be used to prepare cluster‐based materials with tunable properties. In this work we use the methodology to predict the spectrum of Al6Mo. This system was chosen because its neutral counterpart is a perfect octahedron and it is distorted to a D3d symmetry and was not observed in the recent experiments. This high symmetry cluster bridges the less symmetric Al5Mo and Al7Mostructures.The measured spectra of Al5Mo has well defined peaks, while that of Al7Modoes not. This can be explained by the fluxionality of Al7Mo, as at least 6 different structures lie within the range that can be reached by thermal effects. We predict that Al6Mo has well defined peaks, but some broadening is expected as there are two low‐lying isomers, one of D3d and the second of D3h symmetry that are only 0.052 eV apart.

中文翻译:


预测准八面体 Al6Mo-团簇的光电子能谱。



我们最近开发了一种计算方法来分离尺寸、成分、对称性和流动性的影响,以解释混合金属团簇的实验光电子能谱。该方法首先成功地应用于解释观察到的 Al 13 -和 Al 12 Ni -光谱之间的差异,最近又成功地应用于解释测量到的 Al n Mo - ,n=3-5,7 团簇的光谱。我们的方法和新合成技术的结合可用于制备具有可调性能的基于簇的材料。在这项工作中,我们使用该方法来预测 Al 6 Mo 的光谱选择这个系统是因为它的中性对应物是一个完美的八面体,并且它扭曲为 D 3d对称性,并且在最近的实验中没有观察到。这种高对称性团簇桥接了不太对称的 Al 5 MoAl 7 Mo结构。Al 5 Mo的测量光谱具有明确的峰值,而 Al 7 Mo 的光谱没有。这可以通过 Al 7 Mo 的流动性来解释因为至少有 6 种不同的结构位于热效应可以达到的范围内。我们预测 Al 6 Mo 具有明确的峰,但预计会有一些展宽,因为有两种低位异构体,一种是 D 3d对称性,另一种是 D 3h对称性,两者仅相距 0.052 eV。
更新日期:2020-05-04
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