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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Assessing the performance of density functional theory for the electronic structure of metal-salens: The 3d(0)-metals
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Assessing the performance of density functional theory for the electronic structure of metal-salens: The 3d(0)-metals

机译:评估密度函数理论对金属卤化物电子结构的性能:3d(0)-金属

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摘要

A series of metal-salen complexes of the 3d(0) metals Sc(III), Ti(IV), V(V), Cr(VI), and Mn(VII) have been explored using high-level electronic structure methods including coupled-cluster theory with singles, doubles, and perturbative triples as well as complete active-space third-order perturbation theory. The performance of three common density functional theory approaches has been assessed for both the geometries and the relative energies of the low-lying electronic states. The nondynamical correlation effects are demonstrated to be extremely large in all of the systems examined. Although density functional theory provides reasonable results for some of the systems, the overall agreement is quite poor. This said, the density functional theory approaches are shown to outperform the single-reference perturbation theory and coupled-cluster theory approaches for cases of strong nondynamical correlation.
机译:已经使用高级电子结构方法探索了3d(0)金属Sc(III),Ti(IV),V(V),Cr(VI)和Mn(VII)的一系列金属沙仑配合物具有单,双和扰动三元组的耦合集群理论,以及完整的主动空间三阶扰动理论。三种常见的密度泛函理论方法的性能已针对低电子态的几何形状和相对能量进行了评估。在所有检查的系统中,非动力相关效应都被证明是非常大的。尽管密度泛函理论为某些系统提供了合理的结果,但总体一致性还是很差的。也就是说,对于非动态相关性强的情况,密度泛函理论方法的性能优于单参考微扰理论和耦合簇理论的方法。

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