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Collision-induced dissociation of [UO2(NO3)(O-2)](-) and reactions of product ions with H2O and O-2

机译:碰撞诱导的[UO 2(NO 3)(O-2)]( - )和产物离子反应与H2O和O-2的反应

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We recently reported a detailed investigation of the collision-induced dissociation (CID) of [UO2(NO3)(3)](-) and [UO2(NO3)(2)(O-2)](-) in a linear ion trap mass spectrometer (J. Mass Spectrom. DOI:10.1002/jms.4705). Here, we describe the CID of [UO2(NO3)(O-2)](-) which is created directly by ESI, or indirectly by simple elimination of O-2 from [UO2(NO3)(O-2)(2)](-). CID of [UO2(NO3)(O-2)](-) creates product ions as at m/z 332 and m/z 318. The former may be formed directly by elimination of O-2, while the latter required decomposition of a nitrate ligand and elimination of NO2. DFT calculations identify a pathway by which both product ions can be generated, which involves initial isomerization of [UO2(NO3)(O-2)](-) to create [UO2(O)(NO2)(O-2)](-), from which elimination of NO2 or O-2 will leave [UO2(O)(O-2)](-) or [UO2(O)(NO2)](-), respectively. For the latter product ion, the composition assignment of [UO2(O)(NO2)](-) rather than [UO2(NO3)](-) is supported by ion-molecule reaction behavior, and in particular, the fact that spontaneous addition of O-2, which is predicted to be the dominant reaction pathway for [UO2(NO3)](-) is not observed. Instead, the species reacts with H2O, which is predicted to be the favored pathway for [UO2(O)(NO2)](-). This result in particular demonstrates the utility of ion-molecule reactions to assist the determination of ion composition. As in our earlier study, we find that ions such as [UO2(O)(NO2)](-) and [UO2(O)(O-2)](-) form H2O adducts, and calculations suggest these species spontaneously rearrange to create dihydroxides.
机译:我们最近报道了在线性离子阱质谱仪(J.mass Spectrom.DOI:10.1002/jms.4705)中对[UO2(NO3)(3)](-)和[UO2(NO3)(2)(O-2)](-)的碰撞诱导离解(CID)的详细研究。在这里,我们描述了[UO2(NO3)(O-2)](-)的CID,该CID由ESI直接产生,或通过从[UO2(NO3)(O-2)(2)](-)中简单消除O-2间接产生。[UO2(NO3)(O-2)](-)的CID在m/z 332和m/z 318处产生产物离子。前者可以通过消除O-2直接形成,而后者需要分解硝酸盐配体并消除NO2。DFT计算确定了生成两种产物离子的途径,这涉及到[UO2(NO3)(O-2)](-)的初始异构化以生成[UO2(O)(NO2)(O-2)](-),NO2或O-2的消除将分别离开[UO2(O)(O-2)](-)或[UO2(O)(NO2)](-)。对于后一种产物离子,[UO2(O)(NO2)](-)而非[UO2(NO3)](-)的组成分配由离子-分子反应行为支持,尤其是,未观察到O-2的自发加成,这被预测为[UO2(NO3)](-)的主要反应途径。相反,该物种与H2O反应,这被预测为[UO2(O)(NO2)](-)的有利途径。这一结果尤其证明了离子-分子反应在帮助确定离子组成方面的效用。在我们之前的研究中,我们发现[UO2(O)(NO2)](-)和[UO2(O)(O-2)](-)等离子形成H2O加合物,计算表明这些物种自发地重新排列以生成二氢氧化物。

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