Mass spectra of organometallic compounds. VI. Some indenylmetal derivatives and related compounds

Abstract

The mass spectra of the following complexes have been investigated: (a) the indenylmolybdenum carbonyl derivatives CH3Mo(CO)3C9H7, π-C3H5Mo(CO)2C9H7, π-CH3SCH2Mo(CO)2C5H5, and C9H7Mo(CO)2I; (b) the bisindenyl derivative (C9H7)2Fe; (c) the series of compounds C5H5FeC9H7, C5H5FeC9H9, and C5H5FeC9H11 with different degrees of hydrogenation of the π-indenyl ligand. The following features of particular interest were noted: (a) evidence for the existence of small amounts of the new compound π-C3H5Mo(CO)2C9H6C3H5 in the sample of π-C3H5Mo(CO)2C9H7; (b) evidence for the pyrolysis of C9H7Mo(CO)2I to give [C9H7MoI2]2 and (C9H7)2MoCOI; (c) evidence for the fragmentation of C9H7Fe+ to give the ion C9H7+ and a neutral iron atom; (d) evidence for parallel pathways for fragmentation of the parent ion from C5H5FeC9H11 involving elimination of CH3, C2H4, C3H5, C5H6, and H2. Diagnostic features from the mass spectrum for the presence of a π-indenyl ligand in a complex appear to be the ions C9H8+, C9H7+, C7H5+, C5H3+, and C9H72+.