Titanyl

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.[2] 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.

Structure of OTi(NCS)₂(Me₃tacn).[1]

References

Axel Bodner, Peter Jeske, Thomas Weyhermueller, Karl Wieghardt, Erich Dubler, Helmut Schmalle, Bernhard Nuber (1992). "{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)". Inorganic Chemistry. 31: 3737–3748. doi:10.1021/ic00044a015.CS1 maint: uses authors parameter (link)
John Meurig Thomas, Gopinathan Sankar (2001). "The Role of Synchrotron-Based Studies in the Elucidation and Design of Active Sites in Titanium−Silica Epoxidation Catalysts". Accounts of Chemical Research. 34: 571–581. doi:10.1021/ar010003w.CS1 maint: uses authors parameter (link)

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[1] Axel Bodner, Peter Jeske, Thomas Weyhermueller, Karl Wieghardt, Erich Dubler, Helmut Schmalle, Bernhard Nuber (1992). "{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)". Inorganic Chemistry. 31: 3737–3748. doi:10.1021/ic00044a015.CS1 maint: uses authors parameter (link)

[2] John Meurig Thomas, Gopinathan Sankar (2001). "The Role of Synchrotron-Based Studies in the Elucidation and Design of Active Sites in Titanium−Silica Epoxidation Catalysts". Accounts of Chemical Research. 34: 571–581. doi:10.1021/ar010003w.CS1 maint: uses authors parameter (link)