Effect of hydration and structure on the fragmentation of 2,2-(propane-1,3-diyl)bis(isoindoline-1,3-dione) and 2,2-(ethane-1,2-diyl)bis(isoindoline-1,3-dione) in electron impact ionization-mass spectrometry: A theoretical and experimental study
作者:Samiyeh Yosefdad、Younes Valadbeigi、Mohammad Bayat
DOI:10.1016/j.molstruc.2019.127105
日期:2020.1
observed for the molecular ion of 4 indicating the stability of 4+ ion. The results were interpreted using computational method at B3LYP/6-31 + G(d) level of theory. Also, comparison of the mass spectra showed that the cation 4+ is tri-hydrated while 3+ is not hydrated. From the optimized structures of 4+(H2O)1-3 clusters, it was found that the extra stability of 4+(H2O)3 is due to formation of hydronium
摘要 两种双邻苯二甲酰亚胺衍生物,2,2-(ether-1,2-diyl)bis(isoindoline-1,3-dione) (3) 和 2,2-(propane-1,3-diyl)bis(isoindoline) -1,3-二酮) (4) 被合成并通过 1H NMR、13C NMR 和电子碰撞电离质谱 (EI-MS) 进行表征。研究了烷基长度对化合物 3 和 4 裂解的影响,发现具有 CH2-CH2 基团的 3 分子离子几乎完全分解,因此在 m/ z 为 320。另一方面,对于 4 的分子离子观察到 m/z 为 334 的强峰,表明 4+ 离子的稳定性。使用计算方法在 B3LYP/6-31 + G(d) 理论水平解释结果。此外,质谱的比较表明,阳离子 4+ 是三水合的,而 3+ 没有水合。