Konstantinos P Zois, Andreas A Danopoulos, Demeter Tzeli
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引用次数: 0
摘要
n -杂环碳烯(NHC)在现代化学和材料科学中有着广泛的应用。对它们的电子结构和金属配合物的深入了解仍然是一个重要的研究课题,也是实验和理论的兴趣所在。与常用的HOMO-LUMO(H-L)间隙或单重态-三重态(S-T)垂直间隙相比,由于其计算简单,有时会导致有争议的结果,我们建立了绝热单重态-三重态间隙作为一种优越的,可量化的临界描述符,对NHCs的性质和结构多样性敏感,从而成功地使实验观测和计算提取的趋势变得合理。这一选择得到了对NHCs电子结构的基准研究的支持,该研究使用了高级从头算方法,即CASSCF、NEVPT2、MRCISD、dllnpo - ccsd (T)以及DFT方法,如BP86、M06和M06- l、B3LYP、PBE0、TPSSh、CAM-B3LYP和B2PLYP。研究发现,NHCs或其配合物的绝热S-T间隙对NHCs的性质和结构特征更敏感,而不是对所使用的方法类型或DFT内所使用的泛函更敏感,因此在一定程度上满足了对关键参数的要求。
N-Heterocyclic Carbenes: A Benchmark Study on their Singlet-Triplet Energy Gap as a Critical Molecular Descriptor.
N-heterocyclic carbenes (NHCs) are used extensively in modern chemistry and materials science. The in-depth understanding of their electronic structure and their metal complexes remains an important topic of research and of experimental and theoretical interest. Herein, the adiabatic singlet-triplet gap as a superior, quantifiable critical descriptor, sensitive to the nature and the structural diversity of the NHCs, for a successful rationalization of experimental observations and computationally extracted trends is established. The choice is supported by a benchmark study on the electronic structures of NHCs, using high-level ab initio methods, that is, complete active space self-consistent field, n-electron valence second-order perturbation theory, multireference configuration interaction + singles + doubles, and domain-based local pair natural orbital-coupled cluster method with single-, double-, and perturbative triple excitations along with density functional theory methods such as BP86, M06, and M06-L, B3LYP, PBE0, TPSSh, CAM-B3LYP, and B2PLYP. In contrast to the adiabatic singlet-triplet (S-T) gap preferred as descriptor, the highest occupied molecular orbital-lowest unoccupied molecular orbital gap or the S-T vertical gap that has been used in the past occasionally leads to controversial results; some of these are critically discussed below. Extrapolation of these ideas to a group of copper-NHC complexes is also described.
期刊介绍:
ChemPhysChem is one of the leading chemistry/physics interdisciplinary journals (ISI Impact Factor 2018: 3.077) for physical chemistry and chemical physics. It is published on behalf of Chemistry Europe, an association of 16 European chemical societies.
ChemPhysChem is an international source for important primary and critical secondary information across the whole field of physical chemistry and chemical physics. It integrates this wide and flourishing field ranging from Solid State and Soft-Matter Research, Electro- and Photochemistry, Femtochemistry and Nanotechnology, Complex Systems, Single-Molecule Research, Clusters and Colloids, Catalysis and Surface Science, Biophysics and Physical Biochemistry, Atmospheric and Environmental Chemistry, and many more topics. ChemPhysChem is peer-reviewed.