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What ion is generated when ionizing acetonitrile?

机译:电离乙腈时会产生什么离子?

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It has long been assumed that ionizing neutral acetonitrile produces ions with the same atomic connectivity, CH3CN+center dot. Recent calculations on the C2H3N+center dot potential energy surface have suggested that it may be difficult to generate pure CH3CN+center dot when ionizing acetonitrile. We have probed the interconversion of CH3CN+center dot and its lower energy isomer CH2CNH+center dot by calculation, collision-induced dissociation mass spectrometry and ion-molecule reaction. The latter ion, ionized ketenimine, is co-generated upon electron or chemical ionization of neutral acetonitrile in the ion source of a mass spectrometer. An estimate of the ratio of the two isomers can be obtained from their respective ion-molecule reactions with CO2 or COS. CH3CN+center dot reacts by proton-transfer with CO2 and charge transfer with COS, whereas CH2CNH+center dot is unreactive.
机译:长期以来,人们一直认为电离中性乙腈会产生具有相同原子连通性的离子,即CH3CN +中心点。 C2H3N +中心点势能面的最新计算表明,电离乙腈时可能难以生成纯CH3CN +中心点。通过计算,碰撞诱导解离质谱和离子分子反应,我们研究了CH3CN +中心点与低能异构体CH2CNH +中心点的相互转化。在中性乙腈在质谱仪的离子源中通过电子或化学电离后,会生成后一个离子,即电离的酮亚胺。可以通过它们各自与CO2或COS的离子分子反应来估算两种异构体的比例,CH3CN +中心点通过质子转移与CO2反应,并通过电荷转移与COS进行反应,而CH2CNH +中心点则没有反应性。

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