Design of a dinuclear ruthenium based catalyst with a rigid xanthene bridge for catalytic water oxidation |
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| Affiliation: | 1. Department of Inorganic Chemistry, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia;2. Institute of Analytical Chemistry, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia;3. Department of Physical Chemistry, Slovak University of Technology in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia;4. Department of Chemistry, University of SS Cyril and Methodius in Trnava, J. Herdu 2, 917 01 Trnava, Slovakia |
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| Abstract: | A new dinuclear ruthenium complex 1 (L1[Ru(bda)2(picoline)]2) based on Ru–bda (H2bda = 2,2′-bipyridine-6,6′-dicarboxylic acid) and dipyridyl xanthene (L1 = 4,5-dipyridyl-2,7-di-tert-butyl-9,9-dimethyl xanthene) ligand was synthesized to probe the catalytic oxidation of water. An oxygen evolution experiment displays a low catalytic water oxidation activity with a first-order reaction kinetic mechanism. The result indicates that the O O bond formation of the dinuclear catalyst 1 follows a water nucleophilic attack pathway rather than a radical coupling pathway. The most plausible interpretation is that the steric hindrance effects of the L1 and bda ligands lead to a disadvantage in forming the face-to-face configuration of the two active sites in a one dimer molecule. |
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