Chemical Ionization Mass Spectrometry of Bifunctional o-Xylylene Compounds. Absence of Proton Transfer Interactions between Two Functional Groups in Fragmenting Molecular Protonated Ions

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概要

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• Chemical ionization mass spectra of bifunctional o-xylylene amino hydroxy derivatives were measured and compared to those of m- or p-compounds. The intensity of [MH]+ peaks from o-compounds were larger than those from m- or p-isomers. This is due to the stabilization by internal hydrogen bond formation between two neighboring functional groups in stable and non-decomposing [MH]+ ions. The extent of fragmentation ratio of each functional group was calculated from observed relative intensities of respective fragment ion peaks. Surprisingly the ratio falls into approximately the same range of the corresponding ratio of m- or p-compounds. The results indicated that internal hydrogen bond formation, which may lead to proton transfer, could not compete with the simple bond cleavage in energy-rich fragmenting [MH]+ ions.

• 日本質量分析学会の論文

著者

• Nakata Hisao

  Department Of Chemistry Aichi Kyoiku University

• YAMAOKA Natsuko

  Department of Chemistry, Aichi Kyoiku University

• KADOGUCHI Kenji

  Department of Chemistry, Aichi Kyoiku University

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