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Issue 17, 2011
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Cyclodextrin-based systems for photoinduced hydrogen evolution

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Abstract

Light-driven catalytic three component systems for the reduction of protons, consisting of a cyclodextrin-appended iridium complex as photosensitizer, a viologen-based electron relay, and cyclodextrin-modified platinum nanoparticles as the catalyst, were found to be capable of producing molecular hydrogen effectively in water, using a sacrificial electron donor. The modular approach introduced in this study allows the generation of several functional photo-active systems by self-assembly from a limited number of building blocks. We established that systems with polypyridine iridium complexes of general formula [Ir(ppy)2(pytl-R)]Cl (ppy, 2-phenylpyridine; pytl, 2-(1-substituted-1H-1,2,3-triazol-4-yl)pyridine) as photosensitizers are active in the production of H2, with yields that under our experimental conditions are 20–35 times higher than those of the classical system with [Ru(bpy)3]Cl2 (bpy, 2,2′-bipyridine), methyl viologen, and Pt. By investigating different photocatalytic systems, it was found that the amount of hydrogen produced was directly proportional to the emission quantum yield of the photosensitizer.

Graphical abstract: Cyclodextrin-based systems for photoinduced hydrogen evolution

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Publication details

The article was received on 13 Dec 2010, accepted on 01 Mar 2011 and first published on 28 Mar 2011


Article type: Paper
DOI: 10.1039/C0CP02867C
Citation: Phys. Chem. Chem. Phys., 2011,13, 7903-7909
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    Cyclodextrin-based systems for photoinduced hydrogen evolution

    N. Mourtzis, P. C. Carballada, M. Felici, R. J. M. Nolte, R. M. Williams, L. de Cola and M. C. Feiters, Phys. Chem. Chem. Phys., 2011, 13, 7903
    DOI: 10.1039/C0CP02867C

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