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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Steric asymmetry in electron transfer from potassium atoms to oriented nitromethane (CH3NO2) molecules
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Steric asymmetry in electron transfer from potassium atoms to oriented nitromethane (CH3NO2) molecules

机译：电子从钾原子转移到取向的硝基甲烷（CH3NO2）分子中的立体不对称

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Electrons are transferred in collisions between potassium atoms and CH3NO2 molecules that have been oriented in space prior to collision. The electron transfer produces K+ ions, parent negative ions CH3NO2-, and the fragment ions e(-), NO2-, and O- in amounts that depend on the energy. The positive and negative ions are detected in coincidence by separate time-of-flight mass spectrometers at various collision energies for both CH3-end attack and NO2-end attack. The steric asymmetry for electrons and CH3NO2- is essentially zero, but the steric asymmetry for NO2- shows that NO2- is formed mainly in CH3-end collisions. There is evidence that the electrons and NO2- have the same transient precursor, despite having different steric asymmetries. It appears likely that the precursor is formed by electron transfer mainly in collisions normal to the molecular axis leading to near zero steric asymmetry for the electron. This transient precursor can also eject an NO,ion, which is more likely to be removed as KNO2 salt when K+ ions are near the NO2 end of the molecule, with the result that CH3-end collisions seem to produce more NO2-.
机译：电子在碰撞前在空间中取向的钾原子和CH3NO2分子之间的碰撞中转移。电子转移产生K +离子，母体负离子CH3NO2-和碎片离子e（-），NO2-和O-的数量取决于能量。正离子和负离子通过不同的飞行时间质谱仪同时检测到CH3端和NO2端的各种碰撞能量。电子和CH3NO2-的空间不对称性基本上为零，但NO2-的空间不对称性表明NO2-主要是在CH3端碰撞中形成的。有证据表明，尽管电子和NO2-具有不同的空间不对称性，但它们具有相同的瞬态前体。似乎前体可能是通过电子转移而形成的，主要是在垂直于分子轴的碰撞中导致电子的空间不对称性接近零。这种短暂的前体也可以喷射出NO离子，当K +离子靠近分子的NO2端时，NO离子更可能以KNO2盐的形式被去除，结果CH3端的碰撞似乎会产生更多的NO2-。

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