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Variable temperature IR spectroscopy and quantum chemistry as the tool for diagnostics of metal spin state

机译:可变温度红外光谱和量子化学作为诊断金属自旋态的工具

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摘要

DFT computations successfully predict structural, energetic and spectral differences between the low- and high-spin forms of the Fe(II) spin crossover complexes with tris(pyrazol-1-yl)methane (HC(Pz)_3). The spectral differences in the mid-IR range, where ligand vibrations are active, are caused by changes of the force constants of the [Fe{HC(Pz)_3} _2]~(2+) cation. Concomitant geometry changes and interionic interactions play only minor role in the spectral effects, which allows to use the combined quantum-chemical/spectroscopic approach for diagnostics of metal spin state in the complexes. To predict the energy gap between the low- and high-spin forms, the anions must be taken into account.
机译:DFT计算成功地预测了具有三(吡唑-1-基)甲烷(HC(Pz)_3)的Fe(II)自旋交叉络合物的低旋和高旋形式之间的结构,能量和光谱差异。配体振动活跃的中红外光谱范围内的光谱差异是由[Fe {HC(Pz)_3} _2]〜(2+)阳离子的力常数变化引起的。伴随的几何形状变化和离子间相互作用在光谱效应中仅扮演很小的角色,这允许使用组合的量子化学/光谱方法来诊断配合物中的金属自旋态。要预测低旋和高旋形式之间的能隙,必须考虑到阴离子。

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