Synthesis and Molecular Structures of Some New Titanium(IV) Aryloxides

The coordination chemistry of model phenolic ligands (pyrocatechol, salicylic acid, and 2,2'-biphenol)
that are able to form respectively five-, six-, or seven-membered rings with titanium(IV) alkoxides is investigated.
With pyrocatechol, a polynuclear complex containing 10 Ti atoms was characterized with a not very common
doubly bridging μ3-(O,O,O',O') coordination mode. With salicylic acid, a monomeric tris(chelate) complex
was obtained. With 2,2'-biphenol, a polynuclear complex containing six Ti atoms was obtained showing both
μ2-(O,O') and μ2-(O,O,O') coordination modes for the ligands. Intermolecular interactions in the solid state
for these three new compounds are also quantitatively discussed using the partial charge model.