Ion/molecule reactions provide new evidence for the structure and origin of [C3H4N]+ from acetonitrile chemical ionization plasma
✍ Scribed by Neil J. Oldham
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 61 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0951-4198
No coin nor oath required. For personal study only.
✦ Synopsis
Ion/molecule reactions leading to formation of the diagnostically useful [C 3 H 4 N] ion (m/z 54), from acetonitrile CI plasma, have been studied using a tandem quadrupole mass spectrometer. Evidence is presented to demonstrate that [C 3 H 4 N] is produced from an ion/molecule reaction between [C 2 H 2 N] (m/z 40) and neutral acetonitrile, via a [C 4 H 5 N 2 ] (m/z 81) intermediate. Loss of HCN, where the H atom arises from neutral acetonitrile and the CN group from [C 2 H 2 N] (m/z 40), leads to the production of [C 3 H 4 N] (m/z 54). These results are consistent with a proposed concerted elimination of HCN, generating m/z 54 as a methylene vinylidene ammonium ion.