Electron spin resonance spectra of some nitrogen, phosphorus, and arsenic complexes of biscyclopentadienyltitanium(III)

Abstract

E.s.r. spectra have been obtained during the reaction of (π-C₅H₅)₂ TiCl₂ and an excess of NaMR₂, where M is N, P, or As and R is typically phenyl. The spectra indicate that the initial paramagnetic product contains only one M nucleus, but that a second M nucleus can be introduced by subsequent reaction. Possible formulae for the products are (π-C₅H₅)₂Ti^IIIMR₂ and [(π-C₅H₅)₂Ti^III(MR₂)₂]^–. We have observed in the spectra of these and similar complexes an approximately linear relationship between the isotropic titanium coupling constant and the g-value. It is suggested that complexes for which the relationship holds have similar structures.