Abstract
The negative chemical ionization (NCI) mass spectra with methane of organometallic complexes of benchrotrene, titanocene and zirconocene families have been determined. A comparative study with positive mass spectra by electronic impact shows the complementarity and the specificity of the two techniques. The NCI mass spectra are characterized by very little fragmentation. For the benchrotrene complexes the molecular peaks are considerably enhanced. For some chlorinated titanocene complexes the NCI mass spectra exhibit an ion-molecule attchment peak corresponding to [M + Cl] -
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