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• W2019926741 abstract "Abstract A tandem mass spectrometric study of protonated isomeric hydroxypyridine N ‐oxides was carried out with a hybrid quadrupole/time‐of‐flight mass spectrometer coupled with different atmospheric pressure ionization sources. The behavior observed in the collision‐induced dissociation (CID) mass spectra of the parent cations, was similar irrespective of the source employed. However, there were intrinsic differences in the intensities of the two fragments observed for each isomer. The major fragment because of elimination of a hydroxyl radical, dominated the CID spectra (in contrast with weaker water loss) at different energy thresholds. Therefore, it was possible to differentiate both isomers at collision energies above 13 eV by comparing the ratio of intensities of the major fragment relative to the precursor cation. In addition, quantum chemical calculations at the B3LYP/6‐31 + + G(d,p) level of theory were performed for the protonated isomers of hydroxypyridine N ‐oxide and their radical cation products in order to gain insight into the major routes of dissociation. The results suggest that dissociation from the lowest triplet excited state of the protonated species would provide a reasonable rationalization for the difference in behavior of both isomers. Copyright © 2010 John Wiley & Sons, Ltd." @default.
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• W2019926741 date "2010-03-29" @default.
• W2019926741 modified "2023-10-09" @default.
• W2019926741 title "An experimental and computational study on the dissociation behavior of hydroxypyridine N-oxides in atmospheric pressure ionization mass spectrometry" @default.
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• W2019926741 doi "https://doi.org/10.1002/jms.1739" @default.
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