ISSN:
1076-5174
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Ionization efficiency curves for [M — X]- ions from p-XC6H4N=NC6H5 molecules (X=F, Cl, Br) have been registered in the energy range 0-9 eV with appearance energies 3.3, 4.1 and 3.2 ± 0.2 eV, respectively. The heats of formation of 17 isomeric C12H9N- ions have been estimated using isodesmic reactions. The possible mechanism of isomerization of molecule ions leading to various isomeric [M — X]- ions is represented. The resonance stabilization of both negative and positive ions, questioned for negative ions by some workers, was confirmed by measuring appearance energies of conjugated ions [M — H]- and [M — (CCl2 + CI)]- or [M — Me]+ and [M — CCl3]+ coming from p-MeC6H4O—R (R= or Me) and 4-Methyl-4-trichloromethylcyclohexa-2,5-dienone, respectively.
Additional Material:
1 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jms.1190300208
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