The Mass Spectrometry society of Japan - The 68th Annual Conference on Mass Spectrometry, Japan
Japanese

Abstract

Table of contents

Timetable

Plenary Lectures

Award Lecture

Oral Sessions (Day1, Day2, Day3)

Poster Presentations (Day1, Day2, Day3)

Panel Discussion

Luncheon Seminars (Day1, Day2, Day3)

Corporate Program

Oral Sessions

Day 3, June 24（Fri.）　16:20-16:40　Room C (411 and 412)

3C-O2-1620（3P-41）　　PDF

Isomerization of Crown Ether Complexes Studied by Variable-Temperature Cryogenic Ion Mobility–Mass Spectrometry

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

Large conformational changes of dibenzo-24-crown-8 complexes with four guest ions (Ag+, Na+, K+, and NH4+) were observed at low temperature in the gas phase. The isomerization between the two types of conformers, closed and open, which have different distances between the two benzene rings proceeds even at 86 K. Using variable-temperature ion mobility–mass spectrometry (IM-MS), the activation energy for the isomerization is determined to be rather small. Reaction pathway calculations revealed that the isomerization is caused by the sequential rotation of two single bonds in the crown ether ring.