title: Heterogeneous Catalysis for Water Oxidation by an Iridium Complex Immobilized on Bipyridine-Periodic Mesoporous Organosilica.
abstract: Heterogenization of metal-complex catalysts for water oxidation without loss of their catalytic activity is important for the development of devices simulating photosynthesis. In this study, efficient heterogeneous iridium complexes for water oxidation were prepared using bipyridine-bridged periodic mesoporous organosilica (BPy-PMO) as a solid chelating ligand. The BPy-PMO-based iridium catalysts (Ir-BPy-PMO) were prepared by postsynthetic metalation of BPy-PMO and characterized through physicochemical analyses. The Ir-BPy-PMOs showed high catalytic activity for water oxidation. The turnover frequency (TOF) values for Ir-BPy-PMOs were one order of magnitude higher than those of conventional heterogeneous iridium catalysts. The reusability and stability of Ir-BPy-PMO were also examined, and detailed characterization was conducted using powder X-ray diffraction, nitrogen adsorption, (13) C DD MAS NMR spectroscopy, TEM, and XAFS methods.
authors.affiliation: Toyota Central R&D Laboratories, Inc., Nagakute, Aichi, 480-1192, Japan.|Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Liu
authors.affiliation: Toyota Central R&D Laboratories, Inc., Nagakute, Aichi, 480-1192, Japan.
authors.forename: Yoshifumi
authors.initials: Y
authors.lastname: Maegawa
authors.affiliation: Toyota Central R&D Laboratories, Inc., Nagakute, Aichi, 480-1192, Japan.
authors.forename: Yasutomo
authors.initials: Y
authors.lastname: Goto
authors.affiliation: School of Engineering, Tokyo University of Technology, Hachioji, Tokyo, 192-0982, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Hara
authors.affiliation: Toyota Central R&D Laboratories, Inc., Nagakute, Aichi, 480-1192, Japan. inagaki@mosk.tytlabs.co.jp.
authors.forename: Shinji
authors.initials: S
authors.lastname: Inagaki
keywords: heterogeneous catalysis; iridium; oxidation; supported catalysts; water chemistry