Abstract

The decomposition of alkylcyclopentadienyl nitrosyl π-complexes of nickel, (C5H4R)(NO)Ni (R=H, Et,i-Pr, CH2Ph), under the action of electron impact has been studied. The nature of the nitrosyl ligand has been shown to be the factor determining the main fragmentation pathway which involves the abstraction of an NO molecule. The effect of the nature of the ligand on the ability of the molecular ion (C5H4R)LNi+ (L=C5H4R, C5H5, C3H5, NO) to rearrange with hydrogen atom migration from one ligand to another has been considered. The structure of the alkyl group R determines a competing fragmentation pathway involving cleavage of the β-C-C bond with respect to the cyclopentadienyl ring in the substituent.

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