Collisional interaction of ionized pyridine N-oxides with various targets in a new hybrid mass spectrometer

Flammang, Robert; Henrotte, Virginie; Gerbaux, Pascal; Nguyen, Minh Tho

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Collisional interaction of ionized pyridine N-oxides with various targets in a new hybrid mass spectrometer

Flammang, Robert; Henrotte, Virginie; Gerbaux, Pascal et al.

2000 • In European Journal of Mass Spectrometry, 6 (1), p. 3-9

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Abstract :

[en] Upon collisional activation at high kinetic energy (8 keV), the molecular ions of pyridine N-oxides 1-5 undergo an unexpected loss of 16 mass units (oxygen) provided molecular oxygen or nitric oxide is used as the target gas instead of helium. Molecular i

Disciplines :

Chemistry

Author, co-author :

Flammang, Robert

Henrotte, Virginie

Gerbaux, Pascal

Nguyen, Minh Tho

Language :

English

Title :

Collisional interaction of ionized pyridine N-oxides with various targets in a new hybrid mass spectrometer

Publication date :

01 January 2000

Journal title :

European Journal of Mass Spectrometry

ISSN :

1469-0667

Publisher :

IM Publications, United Kingdom

Volume :

Issue :

Pages :

3-9

Peer reviewed :

Peer Reviewed verified by ORBi

Research unit :

S836 - Synthèse et spectrométrie de masse organiques

Available on ORBi UMONS :

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Bibliography

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It has been suggested by the referees that the experimental results do not require the production of two different complexes, but only one with different internal energies. This situation appears, however, unlikely to us as the peaks at m/z 125 and 79 have similar intensities (see Figure 5) and the m/z 79 peak, not observed in the metastable ion spectrum of the m/z 125 ion, is only scarcely (0.5%) seen in the corresponding CA spectrum. Moreover, preliminary theoretical calculations have indicated that the addition of NO on the oxygen of pyridine oxide is exothermic by 150 kJ mol-1, possibly precluding the observation of such a complex. We recognize nevertheless that the question remains open.
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