Reduction processes in the fast atom bombardment mass spectra of pyridinium salts. The effect of reduction potential and concentration

1989 ◽  
Vol 67 (2) ◽  
pp. 183-186 ◽  
Author(s):  
Clement W. Kazakoff ◽  
Robin T. B. Rye ◽  
Oswald S. Tee
Keyword(s):  
Concentration Dependence ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Reduction Potential ◽  
Pyridinium Salts ◽  
Pyridinium Cation ◽  
Reduction Processes ◽  
Pyridinium Cations ◽  
Bombardment Energy ◽  
Matrix Free

The enhancement of the (C + 1)/C ratio in the fast atom bombardment mass spectra of seven pyridinium cations has been measured. No dependence of the enhancement on the cation reduction potential could be identified. The N-methyl pyridinium cation, which showed no enchancement under matrix-free conditions, exhibited an increase in the (C + 1)/C ratio with decreasing concentration. This concentration dependence was eliminated when the bombardment energy was reduced from 9 to 5 keV. Possible mechanisms for the concentration dependence and the variation with bombardment energy are proposed. Keywords: fast atom bombardment, reduction, pyridinium salts.

The fast atom bombardment mass spectra of some N-substituted pyrimidinium salts

1987 ◽  
Vol 65 (4) ◽  
pp. 718-721 ◽  
Author(s):  
Clement W. Kazakoff ◽  
Robin T. B. Rye ◽  
Oswald S. Tee
Keyword(s):  
Concentration Dependence ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Negative Ion ◽  
Cluster Ions ◽  
Solution Equilibria ◽  
Mixed Cluster ◽  
Cluster Ion ◽  
Conventional Solution ◽  
Positive Ion

The fast atom bombardment mass spectra of selected 1,2-dihydro-1,3-disubstituted-2-oxo-pyrimidinium salts are presented. Loss of N-substituents from the solute cation is the principal fragmentation observed in the positive ion spectra. Several concentration dependent features of the spectra are identified; these are thought to result from the interaction of the solute cation with bombardment-induced matrix fragments. Cluster ions are observed in both positive and negative ion spectra. In a mixed solute system cluster ions resulting from extensive cation and anion mixing are observed; the concentration dependence of these mixed cluster ion peaks can be approximately described in terms of conventional solution equilibria.

Fast atom bombardment mass spectra of Fe(CO)3R1CHCR2COR3 compounds

1988 ◽  
Vol 23 (9) ◽  
pp. 674-676 ◽  
Author(s):  
Richard D. Bowen ◽  
Timothy N. Danks ◽  
David Mitchell ◽  
Susan E. Thomas
Keyword(s):  
Mass Spectra ◽  
Fast Atom Bombardment

Evidence for a lysine-specific fragmentation in fast-atom bombardment mass spectra of peptides

1992 ◽  
Vol 6 (4) ◽  
pp. 257-264 ◽  
Author(s):  
Bradley L. Ackermann ◽  
Robert J. Barbuch ◽  
John E. Coutant ◽  
John L. Krstenansky ◽  
Thomas J. Owen
Keyword(s):  
Mass Spectra ◽  
Fast Atom Bombardment

scholarly journals Fast atom bombardment mass spectra of the .BETA.-blocker nipradilol with nitrate ester group-tandem mass spectrometry (MS/MS) and B/E constant linked scanning.

1990 ◽  
Vol 38 (12) ◽  
pp. 3389-3394 ◽  
Author(s):  
Michiaki YONEDA ◽  
Kazuo TSUJIMOTO ◽  
Mamoru OHASHI ◽  
Masami SHIRATSUCHI ◽  
Yasushi OHKAWA ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Beta Blocker ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Ester Group ◽  
Tandem Mass ◽  
Nitrate Ester

Liquid secondary ion mass spectra and fast atom bombardment mass spectra of diquaternary pyridinium oxime salts

1995 ◽  
Vol 30 (2) ◽  
pp. 282-289 ◽  
Author(s):  
Gary J. Kunkel ◽  
Kenneth L. Busch ◽  
Richard Dunphy ◽  
David J. Burinsky ◽  
Ruth Barak ◽  
...  
Keyword(s):  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Secondary Ion

Differentiation of the Isomeric o-(m- and p-) Nitro-(Chloro- and Bromo-)Benzyl-2,4-(and 2,1-) Disubstituted 2-Thiocytosinium Halides by Electron Impact Ionisation and Fast Atom Bombardment Mass Spectrometry

2009 ◽  
Vol 15 (4) ◽  
pp. 497-506 ◽  
Author(s):  
Tomasz Pospieszny ◽  
Elżbieta Wyrzykiewicz
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectra ◽  
Fast Atom Bombardment ◽  
Collision Induced Dissociation ◽  
Mass Measurements ◽  
Fragmentation Pathways ◽  
Mass Spectral ◽  
Fragment Ions ◽  
Accurate Mass Measurements ◽  
Impact Ionisation

Electron ionisation (EI) and fast atom bombardment (FAB) mass spectral fragmentations of nine 2,4-(and 2,1-) disubstituted o-( m- and p-)nitro-(chloro- and bromo-)-2-thiocytosinium halides are investigated. Fragmentation pathways, whose elucidation is assisted by accurate mass measurements and metastable transitions [EI-mass spectrometry (MS)], as well as FAB/collision-induced dissociation (CID) mass spectra measurements are discussed. The correlations between the abundances of the (C11H10N4SO2)+1–3; (C11H10N3SCl)+4–6 and (C11H10N3SBr)+7–9 ions and the selected fragment ions (EI-MS), as well as (C18H16N5SO4)+1–3; (C18H16N3SCl2)+4–6 and (C18H16N3SBr2) + 7–9 ions and the selected ions (C7H6NO2)+1–3; (C7H6Cl)+ 4–6; (C7H6Br)+ 7–9 (FAB-MS) are discussed. The data obtained can be used for distinguishing isomers.

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