Réactions ion/molécule de l'ion C2H3Cl+ dans le mélange gazeux: chlorure de vinyle – chlorure d'éthyle

1989 ◽  
Vol 67 (1) ◽  
pp. 97-103 ◽  
Author(s):  
Jan A. Herman ◽  
Rodica Neagu-Plesu ◽  
Leszek Wójcik
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Vinyl Chloride ◽  
Ethyl Chloride ◽  
The Other ◽  
Mass Spectrometers ◽  
Condensation Reactions ◽  
Ion Molecule Reactions ◽  
Photo Ionization

Ion/molecule reactions of C2H3Cl+ have been studied in a mixture of vinyl and ethyl chlorides. The ionic processes have been followed using two mass spectrometers; one is based on the ionic cyclotronic resonance (ICR) while the other is based on photo-ionization at high pressure. The results obtained on these two instruments are complementary and they indicate that the ion C2H3Cl+ does not react directly with ethyl chloride. However, the ions C4H3Cl+ and C4H6Cl+, which are formed following the decomposition of the excited ion-dimer of vinyl chloride, do react with ethyl chloride in a series of condensation reactions involving in each step an elimination of HCl or of Cl. In a mixture of the two chlorides, the most important ions are the C8H13+ and C8H14+; at a pressure of 1 Tonr, their total intensity is equal to 50%. Keywords: ion/molecule reactions of C2H3Cl+, vinyl and ethyl chloride mixtures, mass spectrometry. [Journal translation]

Réactions ion–molécule de C2H3Cl+ avec le propane et le n-butane

1989 ◽  
Vol 67 (12) ◽  
pp. 2196-2200 ◽  
Author(s):  
Jan A. Herman ◽  
Rodica Neagu-Plesu ◽  
Urszula Krzemien ◽  
Krzysztof Bederski
Keyword(s):  
Mass Spectrometry ◽  
Charge Transfer ◽  
Vinyl Chloride ◽  
Mass Spectrometer ◽  
Pressure Range ◽  
Transfer Processes ◽  
Condensation Reactions ◽  
Ion Molecule Reactions

Ion–molecule reactions of C2H3Cl+ with propane or n-butane have been studied using a photoionization mass spectrometer over the pressure range 0.01–1 Torr. The principal reasons for disappearance of the C2H3Cl+ ion in propane and n-butane are the H−, H2− transfer processes and charge transfer in the case of n-C4H10. The ions CnH2n+1+ and CnH2n+ formed in these transfers react preferentially with neutral vinyl chloride in condensation reactions with elimination of HCl or Cl•. Keywords: ion–molecule reactions, mass spectrometry, vinyl chloride, propane, n-butane. [Journal translation]

An ICR mass spectrometry study of ion/molecule reactions between ethyl chloride and alkylamines

1991 ◽  
Vol 69 (2) ◽  
pp. 363-367
Author(s):  
Guoying Xu ◽  
Jan A. Herman
Keyword(s):  
Mass Spectrometry ◽  
Key Words ◽  
Rate Constant ◽  
Rate Constants ◽  
Ethyl Chloride ◽  
Ion Molecule Reactions ◽  
Mass Spectrometry Study ◽  
Ethyl Cation

Ion/molecule reactions in mixtures of ethyl chloride with C1–C4 alkylamines were studied by ICR mass spectrometry. Ethyl cation transfer to C1–C4 alkylamines proceeds mainly through diethylchloronium ions with rate constants ~3 × 10−10cm3 s−1. In the case of s-butylamine the corresponding rate constant is 0.5 × 10−10 cm3 s−1. Key words: ICR mass spectrometry, ion/molecule reactions, ethylchloride, methylamine, ethylamine, propylamines, butylamines

Formation of C6H7+ ions in ion–molecule reactions in vinyl chloride

1991 ◽  
Vol 69 (12) ◽  
pp. 2038-2043 ◽  
Author(s):  
Jan A. Herman ◽  
Kazimiera Herman ◽  
Terry B. McMahon
Keyword(s):  
High Pressure ◽  
Fourier Transform ◽  
Vinyl Chloride ◽  
Cyclotron Resonance ◽  
Mass Spectra ◽  
Collision Induced Dissociation ◽  
Ion Cyclotron Resonance ◽  
Ion Molecule Reactions ◽  
Step Mechanism ◽  
Ft Icr

The formation of C6H7+ species in ion/molecule reactions in gaseous vinyl chloride was studied in a high pressure photoionization mass spectrometer and in a Fourier transform ion cyclotron resonance (FT-ICR) spectrometer. Collision-induced dissociation (CID) mass spectra of C4H5Cl+, C4H6Cl+, and C6H7+ species suggest a "butadiene-like" structure for the two former ions, and a non-benzenium structure for the last species. The C6H7+ ions are formed in a two-step mechanism involving C4H5+ as intermediate ions. These processes are in competition with condensation reactions leading to the formation of C6H7–9Cl+ species. Key words: ion–molecule reactions, gaseous vinyl chloride, collision-induced dissociation.

Concluding remarks

1979 ◽  
Vol 293 (1400) ◽  
pp. 167-168
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Mass Spectrometer ◽  
Organic Molecules ◽  
Negative Ions ◽  
Negative Ion ◽  
Current Status ◽  
Source Analysis ◽  
Biological Chemistry ◽  
Mass Spectrometers

It is good that from time to time, a group of leading workers in a field should come together to discuss the current status of their research, and the direction in which it will most probably develop. We should all be grateful to the Royal Society in acting as hosts to this conference and to Professor Johnson and Professor Beynon for organizing it. I think that all will agree that the high quality of the papers presented have made this occasion a very memorable and valuable one. I should also like to thank the organizers for the relaxed atmosphere of the Conference, which made it so enjoyable. The last decade has seen a tremendous growth in both the instrumentation and techniques of mass spectrometry and the applications of mass spectrometry to organic and biological chemistry. On the instrumentation side, the modification of a double focusing mass spectrometer to yield ion kinetic energy spectra, giving information about the progenitors of a given ion, and the reversed geometry instrument, yielding information as to the daughter ions of a given parent, have both considerably contributed to our knowledge of the fragmentation of organic molecules. Again the development of special sources, field ionization and field desorption, the linking of a gas or high pressure liquid chromatograph to a mass spectrometer, and the introduction of high pressure sources for chemical ionization, have all made important contributions to organic and biological chemistry. The study of negative ions has also shed considerable light on the structure of organic molecules. Finally, the linking of computers with mass spectrometers has enabled results to be obtained very much more rapidly than in the past, and also made possible library searches to identify the substances present. Mr Craig discussed recent modifications in the source, analysis systems and detector systems of commercial mass spectrometers. Of particular importance was the increased sensitivity obtained by more effective ion collection. Among the newer techniques described during the meeting were g.c.-m.s. (Professor Jellum, Professor Jackson, Dr Morris, Professor Brooks and Professor Eglinton), collisional activation (Professor McLafferty and Dr Morris), negative ion mass spectrometry (Professor Jennings) and reversed geometry mass spectrometry (Professor Beynon).

scholarly journals Mass Spectrometry Coupled with Chromatography toward Separation and Identification of Organic Mixtures

2021 ◽  
Author(s):  
Asmae Bouziani ◽  
Mohamed Yahya
Keyword(s):  
Mass Spectrometry ◽  
Liquid Phase ◽  
Chemical Structure ◽  
Molecular Composition ◽  
The Other ◽  
Complex Mixtures ◽  
Compound Identification ◽  
Mass Spectrometers ◽  
Organic Mixtures ◽  
Ideal Technique

Mass spectrometers can provide information about molecular composition and chemical structure. However, with complex mixtures, superpositions and even suppression of signals may occur. On the other hand, Chromatography is an ideal technique for separating complexes but is often insufficient for compound identification. Hence, coupling both techniques in order to eliminate the limitations of each technique makes perfect sense. In this contribution, a brief description of mass spectrometry coupled with chromatography in the gas and liquid phase will be discussed to explain the advantages of coupling the two methods. The ionization techniques are also reported and followed by application areas of these techniques. Finally, the recording and treatment of the results are reviewed.

ION–MOLECULE REACTIONS STUDIED BY TIME-OF-FLIGHT MASS SPECTROMETRY: II. REACTIONS IN CO–D2 AND CH4–D2 MIXTURES

1964 ◽  
Vol 42 (11) ◽  
pp. 2385-2392 ◽  
Author(s):  
Clifford W. Hand ◽  
Hanns von Weyssenhoff
Keyword(s):  
Mass Spectrometry ◽  
High Pressure ◽  
Reaction Kinetics ◽  
Electric Fields ◽  
Mass Spectrometer ◽  
Time Of Flight ◽  
Molecule Reaction ◽  
External Electric Fields ◽  
Flight Mass Spectrometry ◽  
Ion Molecule Reactions

The pulsed operation capability of the time-of-flight mass spectrometer has been used for the study of ion–molecule reaction kinetics. Reactions take place in a high-pressure (up to 0.08 Torr) region free from external electric fields, and time is used as a direct kinetic variable. The following reactions were studied.[Formula: see text]In CH4–D2 mixtures a reaction in addition to CH4+ + CH4 → CH5+ + CH3 leads to the formation of an ion of m/e 17. Various possibilities for this reaction are discussed.

Sign in / Sign up

Export Citation Format

Share Document