CI Mass Spectra Research Articles

Chemical ionization mass spectrometry of arene-chromium and -molybdenum complexes

The CH 4 CI mass spectra of arenechromium tricarbonyls (Ar = benzene, toluene, fluorobenzene, chlorobenzene, mesitylene, and methyl benzoate), mesitylenemolybdenum tricarbonyl, cycloheptatrienechromium tricarbonyl, and dibenzenechromium have been obtained. The spectra are interpreted in terms of predominant metal protonation of the complexes. The most abundant ion in the spectrum of dibenzenechromium is the molecular ion which perhaps results from H atom loss from the protonated ion. Comparisons are made between gaseous ionic and solution behavior of these compounds.

Studies in chemical ionization mass spectrometry: Aryl Ketones

AbstractThe CI mass spectra of aryl ketones, πCOR, were studied and found to give primarily [M + 29]+, [M + 1]+, [M − 1]+, [πCO]+ and [RCO]+ ions. The major change in the spectra with increasing length of the aliphatic side chain was an increase in the [M − 1]+/[M + 1]+ ratio. Increasing sample size was reflected primarily in the formation of [2M + 1]+ ions and a decrease in [M + 1]+ ions. Small amounts of water in the reactant gas reduced the extent of fragmentation action.