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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Fragmentation of Cr(NO3)(4)(-): Metal Oxidation upon O circle- Abstraction
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Fragmentation of Cr(NO3)(4)(-): Metal Oxidation upon O circle- Abstraction

机译:Cr(NO3)(4)(-)的断裂:O环上的金属氧化-提取

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The decomposition of chromium nitrate anion, Cr(NO3)(4)(-), was investigated by tandem mass spectrometry. The major fragments correspond to sequential elimination of NO2 center dot via O center dot- abstraction from each nitrate ligand to yield CrOn(NO3)(4-n)(-), n = 1-4, products. The metal is oxidized upon the first three O center dot- abstraction reactions to yield the fully oxidized Cr(VI), closed-shell, CrO3(NO3)(-) fragment. A CrO4- fragment was detected, but the metal is not further oxidized upon the fourth O center dot- abstraction. Experiment and theory indicate the first three O center dot- abstraction reactions are low energy processes, but the formation of CrO4- is considerably higher in energy. Theoretical studies show the 3d electrons in chromium are removed by O center dot- for CrOn(NO3)(4-n)(-), n = 1-3, to yield oxo, O2- ligands, but the electron density is replaced by donation from pi bonds involving the oxygen lone pairs. Theory predicts a decrease in metal charge for each O center dot- abstraction, opposite the trend expected for oxidation, due to pi electron donation from the oxygen atoms.
机译:通过串联质谱法研究了硝酸铬阴离子Cr(NO3)(4)(-)的分解。主要片段对应于通过从每个硝酸盐配体中进行O中心点提取而依次消除NO2中心点,从而生成CrOn(NO3)(4-n)(-),n = 1-4的产物。在最初的三个O中心点提取反应中,金属会被氧化,从而生成完全氧化的Cr(VI)闭壳CrO3(NO3)(-)片段。检测到CrO4-片段,但在第四次O中心点抽象时,金属并未进一步氧化。实验和理论表明,前三个O中心点抽象反应是低能过程,但是CrO4-的形成在能量上要高得多。理论研究表明,CrOn(NO3)(4-n)(-)的O中心点可除去铬中的3d电子,n = 1-3,生成氧代O2-配体,但电子密度被代替通过涉及氧孤对的pi键捐赠。理论预测,由于氧原子的pi电子给定,每个O中心点抽象的金属电荷都会减少,这与预期的氧化趋势相反。

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