Abstract
Comparative structure investigations of simple gaseous ions formed by electron impact of organometallic π-complexes have been carried out by use of the collisional activation (CA) technique. The CA mass spectra of C6H6M+ ions (M = V, Cr, Fe) arising either from benzene or from methylcyclopentadienyl metal compounds show significant differences indicating different structures of these fragments. Similar observations were made with C7H7M+ ions produced from benzyl or cycloheptatrienyl chromium tricarbonyl derivatives, although the metal-free ligand ions exhibit identical CA mass spectra. The C6H6V+ -ion arising from C5H5VC7H7 by a rearrangement fragmentation was shown to have the π-benzene vanadium structure.
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