Synthesis and Crystal Structures of Polymeric and Dimeric Forms of an Oxotitanium(IV) Complex with a Tetradentate Schiff Base Ligand

Abstract

Abstract Polymeric and dimeric forms of an oxotitanium(IV) complex with a tetradentate Schiff base ligand, [TiO (salen)]·0.33CH3OH (1) (H2salen: N,N′-disalicylidene-1,2-ethanediamine) and [{TiO(salen)}2]·2DMF (2), were prepared by the reaction of the Schiff base ligand with [{TiO(acac)2}2] (H2acac: acetylacetone) in methanol and in DMF, respectively. X-ray crystal structure analyses of both complexes were carried out. Complex 1 has a linear ···Ti=O···Ti=O··· chain structure with the Ti=O and O···Ti distances being 1.705(2)–1.706(2) and 2.095(2)–2.134(2) Å, respectively. Complex 2 has a dimeric di-μ-oxo structure with the Ti–O distances being 1.804(2) and 1.907(2) Å. A strong band at 744 cm−1 in the IR spectrum of 1 was assigned unambiguously to the Ti=O stretching band by an 18O-labelling experiment.