JMSSJ On-line

JMSSJ On-line, Vol. 51 (2003) No. 2, pp. 359-364

The Characterization and Metastable Decomposition of Isobaric Ions from Several Compounds		>> Full Text PDF >> References
*Yutaka TAKAHASHI,^a) Fukiko HASEGAWA,^b) Chinatsu TANAKA^c) Yuko HIROI,^c) and Susumu TAJIMA^c)* ^*a) MS Development Group, Analytical Instrument Division, JEOL Ltd. (3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan) ^b) Department of Pharmacy, Tokyo Science University (Ichigaya, Shinjuku, Tokyo 162-0826, Japan) ^c) Chemistry and Materials Science, Gunma National College of Technology (580 Toriba-machi, Maebashi, Gunma 371-0845, Japan)

The characterization and metastable decomposition of isobaric ions from several compounds are described by using high-resolution mass spectrometry (HR-MS) and mass-analyzed ion kinetic energy (MIKE) spectrometry. The m/z 45 ions from 2-methoxyethylamine, CH₃OCH₂CH₂NH₂ (1) consists of two isobaric ions, methoxymethyl ion, CH₃OCH₂⁺, and C₂H₇N⁺ ion. The former decomposes into the m/z 29 ion by losing CH₄ in metastable time window. Although the latter decomposes into the m/z 30 and 18 ions, its structure could not be confirmed in this study. The m/z 69 ions generated from methyl trifluoroacetoacetate, CF₃COCH₂COOCH₃ (2) and 1,1,1,5,5,5-hexafluoro-2,4-pentanedione, CF₃COCH₂COCF₃ (3) also consists of two isobaric ions, trifluoromethyl ion, CF₃⁺, and protonated carbon suboxide, OCCHCO⁺. The former does not decompose into any ions in the metastable time window. On the other hand, the latter decomposes into m/z 41 ion by losing CO.

Key words: Isobaric ions, HR-MS, MIKE spectrometry, D-labeling

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