The structural chemistry of titanyl oligomers and polymers

Chain-like and cyclic structures of compounds with a MIDLINE HORIZONTAL ELLIPSISTi-O-Ti-OMIDLINE HORIZONTAL ELLIPSIS backbone are reviewed, that is, compounds in which the coordination octahedra of the titanium atoms share corners by means of mu 2-O atoms. The charge of the TiO2+ unit is balanced by organic or inorganic ligands which additionally complete the coordination sphere of the titanium atoms. Typical substitution patterns are two mono-anionic bidentate ligands, two monodentate anionic plus two neutral ligands, or one tetradentate dianionic ligand. While only few examples of polymeric chain structures, or segments thereof, were structurally characterized, several types of cyclic compounds are known. This includes rings in which the Ti polyhedra are only linked via the mu 2-O atoms, capped rings, or rings in which the titanium octahedra are additionally bridged by organic ligands.

Automated summary

This article reviews the chain-like and cyclic structures of compounds with a MIDLINE HORIZONTAL ELLIPSISTi-O-Ti-OMIDLINE HORIZONTAL ELLIPSIS backbone. These compounds involve the coordination octahedra of the titanium atoms sharing corners through mu 2-O atoms. The charge of the TiO2+ unit is balanced by organic or inorganic ligands, which also complete the coordination sphere of the titanium atoms. While there are limited structurally characterized chain structures, various types of cyclic compounds are known.