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Ruthenium based photosensitizer/catalyst supramolecular architectures in light driven water oxidation.

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Bibliographic Details
Title:	Ruthenium based photosensitizer/catalyst supramolecular architectures in light driven water oxidation.
Authors:	Burian, Max¹, Syrgiannis, Zois^2,3, La Ganga, Giuseppina⁴, Puntoriero, Fausto⁴, Natali, Mirco⁵, Scandola, Franco⁵, Campagna, Sebastiano⁴, Prato, Maurizio^3,6,7, Bonchio, Marcella², Amenitsch, Heinz¹, Sartorel, Andrea²
Source:	Inorganica Chimica Acta. Jan2017, Vol. 454, p171-175. 5p.
Subjects:	Ruthenium compounds, Photosensitizers, Supramolecular chemistry, Oxidation of water, Photosynthesis, Hydrogen
Abstract:	Light driven water oxidation is a key step in artificial photosynthesis, aimed at splitting water into hydrogen and oxygen with sunlight. In such process, the interactions between a photosensitizer (PS) and a water oxidation catalyst (WOC) play a crucial role in the rates of photoinduced electron transfers, determining the overall quantum efficiency of the system. In this work, by means of Small Angle X-ray Scattering (SAXS) we investigate the nature of the aggregates between ruthenium polypyridine photosensitizers (Rubpy and Ru 4 dend) and a tetraruthenium polyoxometalate (Ru 4 POM) water oxidation catalyst. Aggregate scattering is confirmed by the strong intensity-increase in the low- q regime, whereas the power law-fit of this region show slopes between −3 and −4, suggesting globular and porous aggregates. Intermolecular PS/WOC distances lower than 3 nm support the observed fast photoinduced electron transfers (<120 ps), however the proximity of the two components in the hybrids is also responsible for fast charge recombination. Approaches for inhibiting such undesired process are discussed. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Light driven water oxidation is a key step in artificial photosynthesis, aimed at splitting water into hydrogen and oxygen with sunlight. In such process, the interactions between a photosensitizer (PS) and a water oxidation catalyst (WOC) play a crucial role in the rates of photoinduced electron transfers, determining the overall quantum efficiency of the system. In this work, by means of Small Angle X-ray Scattering (SAXS) we investigate the nature of the aggregates between ruthenium polypyridine photosensitizers (Rubpy and Ru 4 dend) and a tetraruthenium polyoxometalate (Ru 4 POM) water oxidation catalyst. Aggregate scattering is confirmed by the strong intensity-increase in the low- q regime, whereas the power law-fit of this region show slopes between −3 and −4, suggesting globular and porous aggregates. Intermolecular PS/WOC distances lower than 3 nm support the observed fast photoinduced electron transfers (<120 ps), however the proximity of the two components in the hybrids is also responsible for fast charge recombination. Approaches for inhibiting such undesired process are discussed. [ABSTRACT FROM AUTHOR]
ISSN:	00201693
DOI:	10.1016/j.ica.2016.04.010