Infrared photodissociation spectroscopy of di-manganese oxide cluster cations.

Infrared photodissociation spectroscopy of di-manganese oxide cluster cations.
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二氧化锰簇阳离子的红外光解光谱

DOI:
10.1039/c9cp04586d
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发表时间:
2019
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
S. M. Lang
S. M. Lang
中科院分区:
--
文献类型:
--
作者:
N. T. Zimmermann;T. M. Bernhardt;J. M. Bakker;U. Landman;S. M. Lang

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用红外多光子解离(IR-MPD)光谱和密度泛函理论(DFT)计算了一系列二锰氧化物簇合物Mn2Ox+(x=4-7)的几何结构。理论探索预测,所有被研究的团簇都包含一个菱形的Mn2O2核心,最多可有四个末端束缚的氧原子。≤的末端氧原子的Mn-O键长较短,表明其具有三键性质,而不是氧自由基的形成。然而,红外光谱显示,在给定的实验条件下,最多两个O2分子与团簇核心配位的高能异构体可以被动力学捕获。在这些络合物中,所有的O2单元都被激活为超氧化物物种。此外,团簇中氧含量的顺序增加使得定域在Mn原子上的正电荷得到控制地增加,对Mn2O7+达到最大值。
Infrared multiple-photon dissociation (IR-MPD) spectroscopy and density functional theory (DFT) calculations have been employed to elucidate the geometric structure of a series of di-manganese oxide clusters Mn2Ox+ (x = 4–7). The theoretical exploration predicts that all investigated clusters contain a rhombus-like Mn2O2 core with up to four, terminally bound, oxygen atoms. The short Mn–O bond length of the terminal oxygen atoms of ≤1.58 Å indicates triple bond character instead of oxyl radical formation. However, the IR-MPD spectra reveal that higher energy isomers with up to two O2 molecules η2-coordinated to the cluster core can be kinetically trapped under the given experimental conditions. In these complexes, all O2 units are activated to superoxide species. In addition, the sequential increase of the oxygen content in the cluster allows for a controlled increase of the positive charge localized on the Mn atoms reaching a maximum for Mn2O7+.
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发表时间: 2004-04-08
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