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Spectroscopic Study of the Benchmark Mn+-H2 Complex

机译:基准Mn + -H2络合物的光谱研究

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摘要

We have recorded the rotationally resolved infrared spectrum of the weakly bound Mn+-H2 complex in the H-H stretch region (4022-4078 cm-1) by monitoring Mn+ photodissociation products. The band center of Mn+-H2, the H-H stretch transition, is shifted by -111.8 cm-1 from the transition of the free H2 molecule.The spectroscopic data suggest that the Mn+-H2 complex consists of a slightly perturbed H2 molecule attached to the Mn+ ion in a T-shaped configuration with a vibrationally averaged intermolecular separation of 2.73A. Together with the measured Mn+ …H2 binding energy of 7.9 kJ/mol (Weis, P.; et al. J. Phys. Chem. A 1997, 101, 2809.), the spectroscopic parameters establish Mn+-H2 as the most thoroughly characterized transition-metal cation-dihydrogen complex and a benchmark for calibrating quantum chemical calculations on noncovalent systems involving open d-shell configurations. Such systems are of possible importance for hydrogen storage applications.
机译:我们已经通过监测Mn +光解离产物记录了H-H拉伸区(4022-4078 cm-1)中弱结合的Mn + -H2复合物的旋转分辨红外光谱。 Mn + -H2的能带中心(HH延伸跃迁)与游离H2分子的跃迁相移-111.8 cm-1。光谱数据表明Mn + -H2络合物由附着在分子上的微扰的H2分子组成T形构型的Mn +离子,其振动平均分子间间距为2.73A。连同测得的7.9 kJ / mol的Mn +…H2结合能(Weis,P.等人,J。Phys。Chem。A 1997,101,2809.),光谱参数确定Mn + -H2为最充分表征的过渡金属阳离子-二氢络合物,以及用于校准涉及开放d壳构型的非共价体系的量子化学计算的基准。这样的系统对于储氢应用可能是重要的。

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