Timeline for What is the structure of 92 m/z fragment for aspirin
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| Mar 8, 2020 at 14:58 | comment | added | vik1245 | Hi there! I've been looking at this answer and you stated a fragment with m/z of 92, 93 or 94 is typical of phenolic compounds alongside loss of CO from the phenolic group: 92-28 = 64 but I can't find any source that confirms such an observation. Where can I find a source that backs up this observation? | |
| Jun 9, 2018 at 15:48 | comment | added | PLD | Just a comment on the first paragraph: it is generally not true to state that "Since that is a very unstable structure". In general, radical cations are minimums on the potential energy surface and some energy must be brought in to allow fragmentation. The point is that electron ionization deposits an extremely variable amount of energy in the system. The sequential fragmentation in the case of aspirin is in itself a nice illustration of this spread in internal energy: some ions are formed with enough energy to break 4 bonds, whereas others remain unfragmented as the molecular ion m/z 180. | |
| Jun 4, 2018 at 14:08 | history | answered | Raoul Kessels | CC BY-SA 4.0 |