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高等学校化学研究 ›› 1998, Vol. 14 ›› Issue (2): 171-175.

• Articles • 上一篇    下一篇

Sites of Protonation and Unimolecular Fragmentation of Protonated N-Hydroxyphthalimide in the Gas Phase

SHE Yi-min, SUN Yu-quan, JI Yi-ping, LIU Shu-ying   

  1. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022
  • 收稿日期:1996-10-24 出版日期:1998-04-24 发布日期:2011-08-17

Sites of Protonation and Unimolecular Fragmentation of Protonated N-Hydroxyphthalimide in the Gas Phase

SHE Yi-min, SUN Yu-quan, JI Yi-ping, LIU Shu-ying   

  1. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022
  • Received:1996-10-24 Online:1998-04-24 Published:2011-08-17

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摘要： The low energy collision induced dissociation, linked scan techniques and isotopic labeling experiment were used to investigate the unimolecular fragmentation of protonated N-hydroxyphthalimide under electron impact and chemical ionization conditions. It was found that this compound shows an unusual reactivity towards protonation. Two possible sites of protonation have been proposed to explain the corresponding fragmentation processes, one is that the protonation takes place on the oxygen atom of hydroxyl group, resulting in the loss of water and the other is the formation of an intermediary proton-bound complex in the fragmentation process, giving rise to the fragment ions of m/z 133 and m/z 135. The results show both cases are coexistence in the fragmentations of protonated N-hydroxyphthalimide, and the unimolecular fragmentation pathways are available.

关键词: Sites of protonation, Unimolecular fragmentation, Collision-induced dissociation, N-hydroxyphthalimide

Abstract: The low energy collision induced dissociation, linked scan techniques and isotopic labeling experiment were used to investigate the unimolecular fragmentation of protonated N-hydroxyphthalimide under electron impact and chemical ionization conditions. It was found that this compound shows an unusual reactivity towards protonation. Two possible sites of protonation have been proposed to explain the corresponding fragmentation processes, one is that the protonation takes place on the oxygen atom of hydroxyl group, resulting in the loss of water and the other is the formation of an intermediary proton-bound complex in the fragmentation process, giving rise to the fragment ions of m/z 133 and m/z 135. The results show both cases are coexistence in the fragmentations of protonated N-hydroxyphthalimide, and the unimolecular fragmentation pathways are available.

Key words: Sites of protonation, Unimolecular fragmentation, Collision-induced dissociation, N-hydroxyphthalimide