首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Formation of a Spin-Forbidden Product, (1)[MnO4](-), from Gas-Phase Decomposition of (6)[Mn(NO3)(3)](-)
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Formation of a Spin-Forbidden Product, (1)[MnO4](-), from Gas-Phase Decomposition of (6)[Mn(NO3)(3)](-)

机译:由(6)[Mn(NO3)(3)](-)的气相分解形成自旋禁止产物(1)[MnO4](-)

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摘要

The manganese nitrate complex, [Mn(NO3)(3)](-), was generated via electrospray ionization and studied by tandem quadrupole mass spectrometry. The complex is assumed to decompose into [MnO(NO3)(2)](-) by elimination of NO2 center dot. The [MnO(NO3)(2)](-) product undergoes elimination of NO2 center dot to yield [MnO2(NO3)](-), or elimination of NO center dot to yield [MnO3(NO3)](-). Both [MnO2(NO3)](-) and [MnO3(NO3)](-) yield [MnO4](-) via the transfer of oxygen atoms from the remaining nitrate ligand. The mechanism of permanganate formation is interesting because it can be generated through two competing pathways, and because the singlet ground state is spin-forbidden from the high-spin sextet [Mn(NO3)(3)](-) precursor. Theory and experiment suggest [MnO2(NO3)](-) is the major intermediate leading to formation of [MnO4](-). Theoretical studies show crossing from the high-spin to low-spin surface upon neutral oxygen atom transfer from the nitrate ligand in [MnO2(NO3)](-) allows formation of (1)[MnO4](-). Relative energy differences for the formation of (1)[MnO4](-) and (1)[MnO3](-) predicted by theory agree with experiment.
机译:硝酸锰络合物[Mn(NO3)(3)](-)是通过电喷雾电离生成的,并通过串联四极杆质谱进行了研究。假定该络合物通过消除NO2中心点分解为[MnO(NO3)(2)](-)。 [MnO(NO3)(2)](-)产物经过消除NO2中心点得到[MnO2(NO3)](-),或消除NO中心点得到[MnO3(NO3)](-)。 [MnO2(NO3)](-)和[MnO3(NO3)](-)均通过从其余硝酸盐配体中转移氧原子而产生[MnO4](-)。高锰酸盐形成的机制很有趣,因为它可以通过两种竞争途径生成,并且由于高自旋六重体[Mn(NO3)(3)](-)前体自旋禁止了单重态基态。理论和实验表明[MnO2(NO3)](-)是导致[MnO4](-)形成的主要中间体。理论研究表明,当中性氧原子从[MnO2(NO3)](-)中的硝酸盐配体转移时,从高自旋表面到低自旋表面的交叉允许形成(1)[MnO4](-)。理论预测的(1)[MnO4](-)和(1)[MnO3](-)形成的相对能差与实验吻合。

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