3 ; and n = 1-3, generated by chemical ionization with water and ammonia as ionizing reagents, have been examined via the analysis of the mass-analysed ion kinetic energy spectra of the protonated molecules. The mechanisms proposed have been probed by chemical ionization of the deuterated analogues
Gas-phase deprotonation of arylalkylamines. A collision-induced dissociation study
✍ Scribed by Ana M. Cardoso; Sílvia M. G. Alexandre; Cristina M. F. Barros; A. J. Ferrer Correia; Nico M. M. Nibbering
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 49 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0951-4198
No coin nor oath required. For personal study only.
✦ Synopsis
2 O as ionizing reagents, is discussed. The negative chemical ionization mass spectra show that, in the absence of a hydroxy group in the aromatic ring, deprotonation takes place at the benzylic position whereas the proton is lost from the OH group when present. The nitro compound forms only M ÀÁ ions. The CID spectra of the deprotonated molecules show that fragmentations are strongly dependent on the structural features of the molecules, namely the presence or absence of substituents in the aromatic ring or aliphatic chain.
📜 SIMILAR VOLUMES
## Abstract Positive singly charged ionic liquid aggregates [(C~__n__~mim)~__m__+1~(BF~4~)~__m__~]^+^ (mim = 3‐methylimidazolium; __n__ = 2, 4, 8 and 10) and [(C~4~mim)~__m__+1~(A)~__m__~]^+^ (A = Cl^−^, BF~4~^−^, PF~6~^−^, CF~3~SO~3~^−^ and (CF~3~SO~2~)~2~N^−^) were investigated by electrospray io
## Abstract Collision‐induced dissociation of the molecular ions and of some of the fragment ions foremed on ionization of methanol, ethanol and n‐propnol have been studied at high energy resolution in a mass spectrometer. The translational energy lost upon collision and the kinetic energy released
Doubly charged molecular anions M2-of fullerenes are formed in the gas phase under chemical ionization conditions with isobutane as the reagent gas. The efficiency of double electron attachment increases with increasing size of the fullerenes: the C& ion is the most abundant doubly charged anion in
The previous quantum mechanical close-coupling study of the dissociative collisions in He + Hz (T-shape configuration) by the present authors [Chem. Phys. Letters 216 (1993) 6131 has been extended to a wide range of the total energy 4.8-7.5 eV. The dissociation process shows a clear vibrational enha