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Excited state electron transfer from cobalt coordination compounds anchored to TiO2
Cobalt(I) macrocycles harvest large fractions of solar photons and efficiently transfer electrons to the acceptor states of TiO2 from metal-to-ligand charge transfer excited states. The presence of axial ligands in solutions dramatically alters the kinetics and thermodynamics of electron transfer pr...
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Published in: | Polyhedron 2014-11, Vol.82, p.181-190 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Cobalt(I) macrocycles harvest large fractions of solar photons and efficiently transfer electrons to the acceptor states of TiO2 from metal-to-ligand charge transfer excited states. The presence of axial ligands in solutions dramatically alters the kinetics and thermodynamics of electron transfer processes.
There exists an urgent need for stable, earth-abundant inorganic coordination compounds and materials that efficiently harvest sunlight and initiate electron transfer reactions that produce electrical power and/or chemical fuels. It was recently discovered that Co(I) coordination compounds do indeed harvest large fractions of solar photons and efficiently transfer electrons to the acceptor states of TiO2 from metal-to-ligand charge transfer excited states. In some cases the electron transfer quantum yield was ∼46%. Remarkably, and unlike other first row transition metal compounds, the unfilled d-orbitals do not quantitatively quench the excited states and allow for efficient excited state electron transfer. A novel feature of the Co(II/I∗) electron transfer chemistry is a large inner-sphere contribution that results from a change in the coordination number. This short review summarizes the most recent findings that suggest new opportunities for solar energy conversion with first-row transition metal compounds. |
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ISSN: | 0277-5387 |
DOI: | 10.1016/j.poly.2014.07.023 |