The chemistry of methyltitanium trichloride. Part III. Oxidation of six-co-ordinate complexes of methyltitanium trichloride. Variable temperature nuclear magnetic resonance and infrared spectra of complexes of methoxytitanium trichloride with bidentate ligands

Abstract

On oxidation, the pseudo-octahedral complexes of methyltitanium trichloride with symmetrical (X = Y) or unsymmetrical (X ≠ Y) substituted ethane ligands, TiCl₃Me,XCH₂CH₂Y (X,Y = OMe, NMe₂, or SMe), give the corresponding complexes of methoxytitanium trichloride, TiCl₃OMe,XCH₂CH₂Y. Studies by variable-temperature n.m.r. spectroscopy indicate that most of the latter complexes are undergoing exchange between meridional and facial forms at room temperature. Electronic factors affecting the lability of the complexes of titanium(IV) in such exchange processes are discussed. In their i.r. spectra, the complexes of methoxytitanium trichloride all show strong bands ca. 1100 and 600 cm^–1 which may be assigned to ν(C–O) and ν(Ti–O) respectively.