New pyridinium based ionic dyes for the hydrogen evolution reaction |
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| Authors: | Dagny D Konieczna Harry Biller Matthias Witte Wolf Gero Schmidt Adam Neuba René Wilhelm |
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| Institution: | 1. Department of Chemistry, Organic Chemistry, University of Paderborn, 33098, Paderborn, Germany;2. Department of Physics, University of Paderborn, 33098, Paderborn, Germany;3. Department of Chemistry, Inorganic Chemistry, University of Paderborn, 33098, Paderborn, Germany |
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| Abstract: | The presented work comprised the synthesis and characterization of new ionic organic dyes as potential photosensitizer (PS) in the photocatalytic H2 evolution reaction. The presented dyes are consisting of donor-π-acceptor (D-π-A) structures that are commonly used for organic dyes for organic solar cells. The acceptor is based on a cationic pyridinium moiety. Furthermore, a complex was synthesized, in which a D-π-A photosensitizer is linked as ligand to cobaloxime. The latter is a common proton reduction catalyst. The attached ligand enabled a fast intramolecular electron transfer to the cobalt center. The resulted complex showed high stability and potential in the homogeneous photocatalytic H2 evolution reaction. Finally, one ionic dye showed a high activity when combined with TiO2 and Pt in a heterogeneous hydrogen evolution reactions with a TOF of up to 407 h?1. |
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| Keywords: | Organic dyes Organic salts Heterocycles Cobaloxime Titanium dioxide Water reduction |
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