Organometalloidal derivatives of the transition metals: XXX. Mass spectrometry of transition metal substituted disilanes

Abstract

Mass spectral fragmentation of a series of transition metal substituted disilanes, LMSiMe 2SiMe 2ML, LM = (η 5-C 5H 5)Fe(CO) 2- (Fp), (η 5-C 5H 5)Fe(η 5-C 5H 4)- (Fc), RFe(CO) 2(η 5-C 5H 4), are reported. They exhibit significant distinctions depending on the nature of LM. Direct cleavage of the SiSi bond occurs in the order Fc å Fp å RFe(CO) 2(η 5-C 5H 4) owing to the capacity of the LM fragment to stabilize positive charge. For complexes containing a direct FeSi bond, i.e. Fp-SiMe 2SiMe 2ML, disilene complexed ions are observed, and those complexes containing both an Fp group and a (η 5-C 5H 4-SiMe 2SiMe 2) group exhibit significant formation of (C 5H 4SiSiMe 2) complexed ions. Little disproportionation is observed for any of the complexes studied, in contrast to organodisilanes.