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Investigation of some pentasubstituted 1,4-dihydropyridines by means of fast ion bombardment, chemical ionization and electron impact mass spectrometry

✍ Scribed by M. Hamdan; M. Scandola; G. Tarzia

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
424 KB
Volume
27
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

Positive fast ion bombardment, positive chemical ionization (CI^+^) and positive electron impact (EI) ionization mass spectrometry were used to investigate a number of relatively large and structurally related organic molecules. Some of the major dissociation pathways observed in the CH~4~‐CI^+^ mass spectra are not present under NH~3~‐CI^+^ conditions, but are obtained in the collision‐induced dissociation (CID) spectrum of the 50 eV MH^+^ molecular ion, formed in the latter reaction. The resemblance between the EI mass spectra and their fast ion bombardment counterparts, the effect of changing the energy of the bombarding Cs^+^ ion beam over the range 2–16 keV and the different degrees of internal excitation of ions formed in different CI reagent gases are discussed.

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