Synthesis, spectroscopic and X-ray characterization of new molecular organotitanium(IV) phosphonate

Dititanate [{Ti(C5Me4Et)(μ-O2P(OH)Me)(μ-O2P(O)Me)}2] (1) was prepared from (C5Me4Et)TiF3 and MeP(O)(OSiMe3)2. The molecular structure of compound 1 has been determined by single-crystal X-ray diffraction analysis. In the cage cluster, two titanium atoms are bridged by two bidentate monoanionic and by two bidentate dianionic phosphonate groups. The OH group of the monoanionic phosphonate and oxygen atom of the dianionic phosphonate are connected by strong intramolecular hydrogen bond. The NMR spectroscopy reveals the fast proton migration within the hydrogen bond.