Synthesis and characterization of titanium (IV) Schiff base complexes, part III 1 . Octahedral titanium (IV) complexes of some dibasic terdentate Schiff base ligands

Complexes of the X2Ti(SB) type, where X is OMe, OEt and OPr-i and SB is the dianion of salicylaldehyde-2-hydroxyanil (H2SAP), acetylacetone-2-hydroxyanil (H2AAP) and acetylacetone-2-mercaptoanil (H2ASP), have been prepared and characterized by means of conductivity, molecular weight, i.r., n.m.r and mass spectral measurements. The ONO and ONS donor ligands are terdentate and the titanium(IV) atom attains six-coordinationvia dimerization of the complexes. The tendency of (i-PrO)2Ti(AAP), where AAP is the dianion of acetylacetone-2-hydroxyanil, to become monomeric and to disproportionate to Ti(AAP)2 and Ti(OPr-i)4 was also investigated. Spectral data are also presented for the octahedral complexes of the Ti(SB)2 type, where SB is the dianion of H2SAP, H2AAP, H2ASP or of the related ONO donor ligands salicylaldehyde-2-hydroxyethylimine (H2SAE), salicylaldehyde-3-hydroxypropylimine (H2SPA), and diisopropylethanolamine (H2DIP).