The reaction of TiF4 with Li(OC(CF3)2Ph): direct synthetic route to the lithium–titanium heterometallic fluoride bridged complex {Li(THF)2TiF3(OC(CF3)2Ph)2}2 and Ti(OC(CF3)2Ph)4 alkoxide

Abstract

Reaction of TiF₄ and LiOR_f (R_f = C(CF₃)₂Ph) in the donor solvent-THF lead to the isolation of the heterometallic lithium–titanium complex (THF)₂Li(μ-F)₂Ti(OR_f)₂(μ-F)₂Ti(OR_f)₂(μ-F)₂Li(THF)₂ (1) and Ti(OR_f)₄ alkoxide (2). Interaction of TiF₄ and LiOR_f in the non-coordinating and low polar toluene yielded only Ti(OR_f)₄ (2). Compounds 1 and 2 were characterized by X-ray single-crystal analysis, IR, NMR and mass spectrometry. Compound 1 is a centrosymmetric fluorine bridged dimer and contains the Li(μ-F)₂Ti(μ-F)₂Ti(μ-F)₂Li cage. Complex 2 containing four bulky ligands is monomeric. NMR evidence is presented that the TiF₄ and LiOR_f in THF solution gave lithium–titanium heterometallic complexes containing Li–(μ-F)–Ti and the Ti–(μ-F)–Ti bonds.