Internal energy effects on the ion/molecule reactions of ionized methyl isocyanide.
Electron ionization of methyl isocyanide in various chemical ionization conditions is reported and, depending on the energy conditions used, different ion/molecule reactions are observed. It is proposed, on the basis of combined quantum chemical (DFT) calculations and tandem mass spectrometric experiments, that a common intermediate could be a cumulenic ionized dimer dissociating in the ion source following two energy depending competitive channels, a loss of a hydrogen atom and a loss of a methyl group. Proposed structures for new cumulenic ions are supported by collision experiments in the high (collisional activation) or/and low (collision- induced dissociations) translational energy regime.
Flammang
Robert
R
Laboratory of Organic Chemistry-Center of Mass Spectrometry-University of Mons-Hainaut, Avenue Maistriau 19, B-7000 Mons, Belgium. robert.flammang@umh.ac.be
De Winter
Julien
J
Gerbaux
Pascal
P
Nguyen
Vinh Son
VS
Nguyen
Minh Tho
MT