Kisch H (2023)
Publication Type: Authored book
Publication year: 2023
Publisher: wiley
ISBN: 9783527690688
DOI: 10.1002/9783527690688.ch13
Treating an aqueous suspension of titania with H2 [PtCl6] or RhX3 (X = Cl, Br) affords halogenometalate complexes of composition Cln M–O–TiO2 M = Pt: n = 4, M = Rh, n = 3. In these, titania can be viewed as a semiconducting “ligand” bound via oxygen to a platinum(IV) or rhodium(III) center. The quasi-Fermi level of electrons in this ligand is shifted anodically by 0.2–0.3 V as compared to the free “ligand.” In the case of the platinum complex visible-light irradiation results in a platinum-centered excitation followed by homolytic Pt–Cl bond cleavage and electron injection of Pt(III) into the titania conduction band. Thus, the reducing and oxidizing surface centers can be described as a trapped electron, i.e. a Ti(III) site, and a loosely bound chlorine atom. In the case of the rhodium surface complex, the excitation is of rhodium-to-titanium charge-transfer type resulting in a Ti(III) center and a Rh(IV) species. These two-center hybrid metal complexes photocatalyze the aerobic visible-light mineralization of halocarbons, atrazine and inactivate bacteria and fungi. They are active even in diffuse indoor daylight.
APA:
Kisch, H. (2023). Visible-Light Photocatalysis by Two-Center Surface Coordination Complexes with Titania as Ligand. wiley.
MLA:
Kisch, Horst. Visible-Light Photocatalysis by Two-Center Surface Coordination Complexes with Titania as Ligand. wiley, 2023.
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