Ti(IV)-centered dynamic interconversion between Pd(II), Ti(IV)-containing ring and cage molecules

Heteronuclear, supramolecular ring and cage complexes have been constructed from a pyridyl catechol ligand, TiO(aca)(2), and PdCl(2)(CH(3)CN(2)). These two complexes are quantitatively interconvertible, in which Ti(4+) centered coordination changes take place between a well-known Ti(catecholato)(3) and a newly established TiH(catecholato)(2)(acetylacetonato) structures. The Ti(4+)-centered structural changes arise from the changes in the component fraction basicity condition.