Electron impact studies. CXXI. Release of kinetic energy during negative-ion fragmentations. The loss of NO+ from substituted nitrobenzene molecular anions

1978 ◽  
Vol 31 (3) ◽  
pp. 573 ◽  
Author(s):  
JH Bowie ◽  
T Blumenthal ◽  
PY White
Keyword(s):  
Kinetic Energy ◽  
Energy Release ◽  
Electron Impact ◽  
Kinetic Energy Release ◽  
Negative Ion ◽  
Unimolecular Decomposition ◽  
Impact Studies ◽  
Nitrobenzoic Acid ◽  
Molecular Anions ◽  
T Values

Kinetic energy release values [T(50%) values] between 0.05 and 0.8 eV have been noted for the unimolecular decomposition M- → (M-NO.)- of the molecular anions of variously substituted nitrobenzenes. Large T values are observed when the substituent is strongly electron-withdrawing. Composite peaks are obtained for m-nitrobenzoic acid and m-nitroacetophenone, showing the occurrence of two distinct processes in these cases.

Electron impact studies. CXV. Release of kinetic energy during negative ion decompositions. C-O bond cleavage reactions

1977 ◽  
Vol 30 (6) ◽  
pp. 1249 ◽  
Author(s):  
G Klass ◽  
JH Bowie
Keyword(s):  
Kinetic Energy ◽  
Energy Release ◽  
Electron Impact ◽  
Bond Cleavage ◽  
Kinetic Energy Release ◽  
Negative Ion ◽  
Impact Studies ◽  
Molecular Anions ◽  
Cleavage Reactions

Kinetic energy release values T(50%) for the collision-induced formation of the p-nitrobenzoate and p-nitrophenoxide anions from the molecular anions of p-O2NC6H4COOC6H4R-p and p-O2NC6H4- OC6H4R-p respectively are small and relatively insensitive to the nature of the substituent R.T (50%) values for the elimination of R? (R = alkyl) from O2NC6H4OR molecular anions range from 0.4 to 0.01 eV, and are dependent upon the nature of R and upon its number of active oscillators.

Electron impact studies. CVIII. Negative-ion mass spectra of the oxime group

1976 ◽  
Vol 29 (11) ◽  
pp. 2437 ◽  
Author(s):  
JH Bowie ◽  
S Janposri
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Major Product ◽  
Negative Ion ◽  
Oxime Group ◽  
Impact Studies ◽  
Molecular Anions

Molecular anions derived from Ar-CH=NOH systems fragment by the process [MI- → [M-H2O]- to yield pronounced peaks corresponding to [ArCN]-. Molecular anions from Ar(CH2)nC(NOH)Ph (n = 0-2) also eliminate H2O, but the mechanisms are often complex. Possible mechanisms for some of these eliminations are suggested after consideration of the + E spectra of non-decomposing [M?H2O]- ions. A characteristic cyclization/retro process of o-O2NC6H4-CH=CH-C(NOH)R molecular anions produces CHO-CR=N-O- as the major product anion.

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