Positive and negative ion mass spectra of Aryl-ONN-azoxy compounds containing electron withdrawing groups

1979 ◽  
Vol 14 (12) ◽  
pp. 668-671 ◽  
Author(s):  
Gian Angelo Vaglio ◽  
Rosa Pia Ferrari ◽  
Vittorio Mortarini ◽  
Alberto Gasco ◽  
Rosella Calvino
Keyword(s):  
Mass Spectra ◽  
Negative Ion ◽  
Azoxy Compounds

Electron impact studies. XXXII. Negative-ion mass spectra of aromatic compounds containing the =N-O- substituent

1968 ◽  
Vol 21 (8) ◽  
pp. 2031 ◽  
Author(s):  
JH Bowie ◽  
SO Lawesson ◽  
BS Larse ◽  
GE Lewis ◽  
G Schroll
Keyword(s):  
Electron Impact ◽  
Aromatic Compounds ◽  
Mass Spectra ◽  
Molecular Ions ◽  
Negative Ion ◽  
Skeletal Rearrangement ◽  
Marked Contrast ◽  
Azoxy Compounds ◽  
Positive Ion ◽  
Fragmentation Processes

The negative-ion mass spectra of aromatic azoxy compounds, nitrones, and N-oxides exhibit pronounced molecular ions and simple fragmentation processes. No skeletal-rearrangement fragments are produced upon electron impact, in marked contrast to those exhibited in the positive-ion spectra of these compounds.

scholarly journals Discrimination of structural isomers of amphetamine using carbon dioxide negative-ion chemical ionization mass spectrometry

1997 ◽  
Vol 13 (2) ◽  
pp. 151-161 ◽  
Author(s):  
Kevin B. Thurbide ◽  
C. M. Elson ◽  
P. G. Sim
Keyword(s):  
Carbon Dioxide ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Negative Ion ◽  
Ionization Mass ◽  
Structural Isomers ◽  
Mass Spectral ◽  
Negative Ion Chemical Ionization ◽  
Spectral Behaviour ◽  
Carbon Dioxide Plasma

The negative‒ion chemical ionization mass spectra of a group of structural isomers of amphetamine have been studied using carbon dioxide as the reagent gas. Characteristic and reproducible differences are observed for each member of the set implying that this technique offers a means of distinguishing among groups of amphetamine isomers. Characteristic adducts to the molecular ion are observed in the form (M–[H]+[O]) and (M–[H]+[CO2]). Descriptions of some fragments are given based on the mass spectral behaviour of a set of analogue compounds and the results of oxygen-18 labelled carbon dioxide reagent gas experiments. Contents of the carbon dioxide plasma and their impact on various analytes is also discussed.

The monomeric metaphosphate anion in negative-ion chemical-ionization mass spectra of phosphotriesters

1984 ◽  
Vol 106 (23) ◽  
pp. 6877-6883 ◽  
Author(s):  
Seymour Meyerson ◽  
Donald J. Harvan ◽  
J. Ronald Hass ◽  
Fausto Ramirez ◽  
James F. Marecek
Keyword(s):  
Mass Spectra ◽  
Chemical Ionization ◽  
Negative Ion ◽  
Ionization Mass ◽  
Negative Ion Chemical Ionization

Negative-ion electrospray mass spectra of carbon dioxide-protectedN-heterocyclic anions

2002 ◽  
Vol 37 (5) ◽  
pp. 541-543 ◽  
Author(s):  
J�rgen H. Gross ◽  
Anke Eckert ◽  
Walter Siebert
Keyword(s):  
Carbon Dioxide ◽  
Mass Spectra ◽  
Negative Ion

Comparison of negative ion electrospray mass spectra measured by seven tandem mass analyzers towards library formation

2007 ◽  
Vol 22 (2) ◽  
pp. 101-108 ◽  
Author(s):  
Kateřina Volná ◽  
Michal Holčapek ◽  
Lenka Kolářová ◽  
Karel Lemr ◽  
Josef Čáslavský ◽  
...  
Keyword(s):  
Mass Spectra ◽  
Negative Ion ◽  
Tandem Mass
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