Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 13, Issue 31, Pages 8726-8732Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200700480
Keywords
energy conversion; hydrogen evolution; iridium; photocatalysis; photochemistry
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Protons from water are reduced by a catalytic system composed of a heteroleptic iridium(III) photosensitizer [Ir(ppy)(2)(bpy)](+), platinum catalyst, and sacrificial reductant. The hydrogen quantum yield reaches 0.26 in this study, which proceeds via reductive quenching of the excited photosensitizer by triethanolamine. This simplified approach allows the characterization of degradation products that are otherwise obscured in more complex systems. A novel 16-well setup for parallel kinetic analysis of H-2 evolution enables high-throughput screening of reaction conditions and quantization of the decaying reaction rate. DFT calculations rationalize the differences between this and previous studies on tris-diimine ruthenium(II) photosensitizers.
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