Magnetic Coupling in the Ce(III) Dimer Ce2(COT)3

化学 二聚体 哈密顿量(控制论) 从头算量子化学方法 各向异性 从头算 交换互动 各向同性 动能 基态 凝聚态物理 分子物理学 联轴节(管道) 原子物理学 物理 量子力学 铁磁性 分子 有机化学 工程类 数学优化 机械工程 数学
作者
Frédéric Gendron,Jochen Autschbach,Jean‐Paul Malrieu,Hélène Bolvin
出处
期刊:Inorganic Chemistry [American Chemical Society]
卷期号:58 (1): 581-593 被引量:14
标识
DOI:10.1021/acs.inorgchem.8b02771
摘要

The monomer [Ce(COT)2]- and the dimer [Ce2(COT)3], with Ce(III) and COT = 1,3,5,7-cyclooctatetraenide, are studied by quantum chemistry calculations. Due to the large spin-orbit coupling, the ground state of the monomer is a strong mixing of σ and π states. The experimental isotropic coupling in the dimer was evaluated by Walter et al. to be J = -7 cm-1 (with a Heisenberg Hamiltonian [Formula: see text]) with a small anisotropic coupling of 0.02 cm-1. The coupling between the two Ce(III) in the dimer is calculated using CI methods. The low energy part of the spectra are modeled by spin Hamiltonians. All spin Hamiltonians parameters are deduced from ab initio calculations. g factors are calculated for both the pseudodoublet of the monomer and the pseudotriplet of the dimer and their sign have been determined. The magnetic coupling in the dimer is rationalized by a model based on crystal field theory. The kinetic and exchange contributions arising from the different configurations to the isotropic and anisotropic couplings are evaluated. It is shown that the main contribution to isotropic coupling is kinetic and originates from the fσ-fσ interaction due to the large transfer integral between those orbitals. However, the fπ-fπ interaction plays a non-negligible role. The anisotropic coupling originates from the difference of exchange energy of states arising from the fσfπ configuration and is, in no matter, related to the anisotropy of the local magnetic moments as already pointed by van Vleck for a fictitious s-p system. The analysis of the natural orbitals evidences a superexchange mechanism through a σCH* orbital of the bridging cycle favored by a local 4fσ/5dσ hybridization and that the δ type orbitals, both the HOMOs of the ligands and the virtual fδ orbitals of the cerium atoms play an important polarization role, and to a less extend the π type orbitals, the HOMOs-1 of the ligands, and the metal fπ orbitals.
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