Titanyl

File:JULMUY.png).{{cite journal|title={Mono- and Dinuclear Titanium(III)/Titanium(IV) Complexes with 1,4,7-Trimethyl-1,4,7-triazacyclononane (L). Crystal Structures of a Compositionally Disordered Green and a Blue Form of [LTiCl₃]. Structures of [LTi(O)(NCS)₂], [LTi(OCH₃)Br₂](ClO₄), and [L₂Ti₂(O)₂F₂(mu-F)](PF₆)|author=Axel Bodner |author2=Peter Jeske |author3=Thomas Weyhermueller |author4=Karl Wieghardt |author5=Erich Dubler |author6=Helmut Schmalle |author7=Bernhard Nuber |journal=Inorganic Chemistry|year=1992|volume=31|pages=3737-3748|doi=10.1021/ic00044a015}}]]

In inorganic chemistry, titanyl refers to the functional group Ti^IVO, sometimes written TiO²⁺. The term titanyl is used loosely to describe many titanium(IV) oxide compounds and complexes. For example, titanyl sulfate and potassium titanyl phosphate contain Ti^IVO centers with the connectivity O-Ti-O-Ti. In heterogeneous catalysis, titanyl refers to a terminal oxo ligand on a surface titanium(IV) center.{{cite journal|title=The Role of Synchrotron-Based Studies in the Elucidation and Design of Active Sites in Titanium−Silica Epoxidation Catalysts|author=John Meurig Thomas |author2=Gopinathan Sankar |journal=Accounts of Chemical Research|year=2001|volume=34|pages=571–581|doi=10.1021/ar010003w}} There are a few molecular titanyl complexes where the oxo ligand is terminal, not bridging. In these cases the titanyl group is described as having a triple bond, i.e., Ti≡O.