Artificial photosynthesis, i.e. conversion of solar energy into fuels, is considered as an attractive potential solution to the global energy issue.1 Among various possibilities, water splitting represents one of the most challenging reaction schemes, involving generation of hydrogen as a clean and renewable fuel.2 Herein we report on the use of porphyrins as molecular platforms for the construction of photoactive systems capable of hydrogen production. In particular, porphyrins either free-base or involving closed-shell metal centers such as zinc(II) and aluminium(III) can be coupled to a cobaloxime catalyst and a sacrificial electron donor and used for the preparation of photocatalytic hydrogen evolving dyad or triad systems.3,4 On the other hand, upon introduction of a redox-active metal center, such as cobalt(II), the porphyrin macrocycle can be used as a suitable catalyst in light-activated water reduction experiments, in the presence of tris(bipyridine) ruthenium(II) as photosensitizer and ascorbic acid as sacrificial electron donor.5 In all these cases, particular attention has been dedicated to the investigation of the photoinduced electron transfer dynamics in order to shine light into the overall photoreaction mechanism.

Porphyrins as Versatile Molecular Components for Photoinduced Hydrogen Production

NATALI, Mirco;SCANDOLA, Franco
2014

Abstract

Artificial photosynthesis, i.e. conversion of solar energy into fuels, is considered as an attractive potential solution to the global energy issue.1 Among various possibilities, water splitting represents one of the most challenging reaction schemes, involving generation of hydrogen as a clean and renewable fuel.2 Herein we report on the use of porphyrins as molecular platforms for the construction of photoactive systems capable of hydrogen production. In particular, porphyrins either free-base or involving closed-shell metal centers such as zinc(II) and aluminium(III) can be coupled to a cobaloxime catalyst and a sacrificial electron donor and used for the preparation of photocatalytic hydrogen evolving dyad or triad systems.3,4 On the other hand, upon introduction of a redox-active metal center, such as cobalt(II), the porphyrin macrocycle can be used as a suitable catalyst in light-activated water reduction experiments, in the presence of tris(bipyridine) ruthenium(II) as photosensitizer and ascorbic acid as sacrificial electron donor.5 In all these cases, particular attention has been dedicated to the investigation of the photoinduced electron transfer dynamics in order to shine light into the overall photoreaction mechanism.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2340175
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