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Issue 4, 2009
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Solar energy conversion using photochemical molecular devices: photocatalytic hydrogen production from water using mixed-metal supramolecular complexes

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Abstract

Photocatalytic generation of hydrogen from water is an integral part of the next generation clean fuel technologies. The conversion of solar energy into useful chemical energy is of great interest in contemporary investigations. The splitting of water is a multi-electron process involving the breaking and making of chemical bonds which requires multi-component photocatalytic systems. Supramolecular complexes [{(TL)2Ru(BL)}2RhX2](Y)5 (where TL = terminal ligand, BL = bridging ligand, X = Cl or Br, and Y = PF6 or Br) have been synthesized and studied for their light absorbing, electrochemical and photocatalytic properties. The supramolecular complexes in this investigation are multi-component systems comprised of two ruthenium based light absorbers connected through bridging ligands to a central rhodium, which acts as an electron collecting center upon excitation. These complexes absorb light throughout the ultraviolet and visible regions of the solar spectrum. The supramolecular complexes possess ruthenium based highest occupied molecular orbitals (HOMO) and a rhodium based lowest unoccupied molecular orbital (LUMO). These molecular devices have been investigated and shown to function as photoinitiated electron collectors at the reactive rhodium metal center, and explored as photocatalysts to generate hydrogen from water in an aqueous solution in the presence of an electron donor.

Graphical abstract: Solar energy conversion using photochemical molecular devices: photocatalytic hydrogen production from water using mixed-metal supramolecular complexes

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Publication details

The article was received on 14 Jul 2008, accepted on 11 Feb 2009 and first published on 06 Mar 2009


Article type: Paper
DOI: 10.1039/B812049H
Citation: Energy Environ. Sci., 2009,2, 410-419
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    Solar energy conversion using photochemical molecular devices: photocatalytic hydrogen production from water using mixed-metal supramolecular complexes

    K. Rangan, S. M. Arachchige, J. R. Brown and K. J. Brewer, Energy Environ. Sci., 2009, 2, 410
    DOI: 10.1039/B812049H

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