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Polymers 2016, 8(5), 180; doi:10.3390/polym8050180

Porphyrin Diacid-Polyelectrolyte Assemblies: Effective Photocatalysts in Solution

1
Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg, Interdisciplinary Center for Molecular Materials (ICMM), Egerlandstraße 3, Erlangen 91058, Germany
2
Institut Laue-Langevin DS/LSS, 71 Avenue des Martyrs, Grenoble F-38000, France
*
Author to whom correspondence should be addressed.
Academic Editor: Christine Wandrey
Received: 19 March 2016 / Revised: 18 April 2016 / Accepted: 25 April 2016 / Published: 4 May 2016
(This article belongs to the Collection Polyelectrolytes)
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Abstract

Developing effective and versatile photocatalytic systems is of great potential in solar energy conversion. Here we investigate the formation of supramolecular catalysts by electrostatic self-assembly in aqueous solution: Combining positively charged porphyrins with negatively charged polyelectrolytes leads to nanoscale assemblies where, next to electrostatic interactions, π–π interactions also play an important role. Porphyrin diacid-polyelectrolyte assemblies exhibit a substantially enhanced catalytic activity for the light-driven oxidation of iodide. Aggregates with the hexavalent cationic porphyrin diacids show up to 22 times higher catalytic activity than the corresponding aggregates under neutral conditions. The catalytic activity can be increased by increasing the valency of the porphyrin and by choice of the loading ratio. The structural investigation of the supramolecular catalysts took place via atomic force microscopy and small angle neutron scattering. Hence, a new facile concept for the design of efficient and tunable self-assembled photocatalysts is presented. View Full-Text
Keywords: self-assembly; porphyrins; supramolecular catalyst; supramolecular structures; polyelectrolytes; photocatalysis self-assembly; porphyrins; supramolecular catalyst; supramolecular structures; polyelectrolytes; photocatalysis
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Frühbeißer, S.; Mariani, G.; Gröhn, F. Porphyrin Diacid-Polyelectrolyte Assemblies: Effective Photocatalysts in Solution. Polymers 2016, 8, 180.

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