title: A Model of a Closed Cycle of Water Splitting Using ansa-Titanocene(III/IV) Triflate Complexes.
abstract: A series of ansa-titanocene triflate complexes are described as model compounds for the elementary steps of light-driven overall water splitting. Titanocene(III) triflate complexes are readily obtained by reaction of a titanocene source with Yb(OTf)3. Subsequent reactions with water and with/without TEMPO as hydrogen scavenger are studied. The as-obtained titanocene(IV) compounds can be photoreduced to give titanocene(III) triflate complexes, which can undergo further hydrolysis to form a closed catalytic cycle of water splitting. No further degradation of the photoreduced species was observed because of the presence of the OTf group. The stability of the system was evaluated in an experiment with high concentrations of water and TEMPO. X-ray crystallography on all titanocene complexes, EPR and NMR spectroscopy, and DFT were used to support our observations.
authors.affiliation: Leibniz-Institut für Katalyse e.V. an der Universität Rostock , Albert-Einstein-Strasse 29a, 18059 Rostock, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Godemann
authors.affiliation: Leibniz-Institut für Katalyse e.V. an der Universität Rostock , Albert-Einstein-Strasse 29a, 18059 Rostock, Germany.
authors.forename: Dirk
authors.initials: D
authors.lastname: Hollmann
authors.affiliation: Leibniz-Institut für Katalyse e.V. an der Universität Rostock , Albert-Einstein-Strasse 29a, 18059 Rostock, Germany.
authors.forename: Monty
authors.initials: M
authors.lastname: Kessler
authors.affiliation: Leibniz-Institut für Katalyse e.V. an der Universität Rostock , Albert-Einstein-Strasse 29a, 18059 Rostock, Germany.
authors.forename: Haijun
authors.initials: H
authors.lastname: Jiao
authors.affiliation: Leibniz-Institut für Katalyse e.V. an der Universität Rostock , Albert-Einstein-Strasse 29a, 18059 Rostock, Germany.
authors.forename: Anke
authors.initials: A
authors.lastname: Spannenberg
authors.affiliation: Leibniz-Institut für Katalyse e.V. an der Universität Rostock , Albert-Einstein-Strasse 29a, 18059 Rostock, Germany.
authors.forename: Angelika
authors.initials: A
authors.lastname: Brückner
authors.affiliation: Leibniz-Institut für Katalyse e.V. an der Universität Rostock , Albert-Einstein-Strasse 29a, 18059 Rostock, Germany.
authors.forename: Torsten
authors.initials: T
authors.lastname: Beweries