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Halohydrination of epoxy resins using sodium halides as cationizing agents in MALDI‐MS and DIOS‐MS
Author(s) -
Watanabe Takehiro,
Kawasaki Hideya,
Kimoto Takashi,
Arakawa Ryuichi
Publication year - 2008
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.1454
Subject(s) - chemistry , epoxy , mass spectrometry , desorption , solvent , fast atom bombardment , halide , ionization , analytical chemistry (journal) , nuclear chemistry , chromatography , inorganic chemistry , organic chemistry , adsorption , ion
Halohydrination of epoxy resins using sodium halides as cationizing agents in matrix‐assisted laser desorption/ionization (MALDI) and desorption ionization on porous silicon mass spectrometry (DIOS‐MS) were investigated. Different mass spectra were observed when NaClO 4 and NaI were used as the cationizing agents at the highest concentration of 10.0 m M , which is much higher than that normally used in MALDI‐MS. MALDI mass spectra of epoxy resins using NaI revealed iodohydrination to occur as epoxy functions of the polymers. The halohydrination also occurred using NaBr, but not NaCl, due to the differences in their nucleophilicities. On the basis of the results of experiments using deuterated CD 3 OD as the solvent, the hydrogen atom source was probably ambient water or residual solvent, rather than being derived from matrices. Halohydrination also occurred with DIOS‐MS in which no organic matrix was used; in addition, reduction of epoxy functions was observed with DIOS. NaI is a useful cationizing agent for changing the chemical form of epoxy resins due to iodohydrination and, thus, for identifying the presence of epoxy functions. Copyright © 2008 John Wiley & Sons, Ltd.