The Mass Spectrometry society of Japan - The 68th Annual Conference on Mass Spectrometry, Japan
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3P-52　　PDF

Isomerization Reactions of Conformers of Dibenzo-Crown Ether–NH4+ Complex Studied by Ion Mobility–Mass Spectrometry

(Tohoku Univ.)
oRyosuke Ito, Xi He, Keijiro Ohshimo, Fuminori Misaizu

Dibenzo-24-crown-8 (DB24C8) complex with NH4+ ion was separated to two types of conformers by ion mobility–mass spectrometry (IM–MS) at 86 K. The two conformers were attributed to open and closed structures in which the relative positions of the two benzene rings were different from each other. As the temperature increased, the bimodal arrival-time distribution (ATD) gradually merged into a single peak because of isomerization between the two conformations, and finally the two types of conformers of NH4+(DB24C8) were not separated above ~ 150 K. ATDs at 86–205 K were analyzed by an original simulation program to obtain the activation energy for isomerization of the complex.