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Issue 4, 2007
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Highly efficient supramolecular photocatalysts for CO2 reduction using visible light

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Abstract

We report the most efficient homogeneous photocatalyst yet for CO2 reduction using a wide range of visible-light wavelength. We synthesized new Ru(II)–Re(I) binuclear complexes with 1,3-bis(4′-methyl-[2,2′]bipyridinyl-4-yl)-propan-2-ol (bpyC3bpy) as a bridge ligand, specifically [Ru-ReP(OEt)3]3+ and [Ru-Repy]3+ where a P(OEt)3 or pyridine ligand coordinates on the Re site. Their photocatalytic activities were compared with [Ru-ReCl]2+, which has a Cl ligand on the Re site and has recently been reported as a much better photocatalyst (Φ = 0.12, TNCO = 160) than a 1 : 1 mixed system of the corresponding Ru(II) and Re(I) mononuclear complexes. The best photocatalyst was [Ru-ReP(OEt)3]3+, for which Φ = 0.21 and TNCO = 232. A mechanistic study clearly showed that [Ru-ReP(OEt)3]3+ is rapidly converted into the solvento complex [Ru-ReSol]3+, (Sol = DMF or TEOA) which is the actual photocatalyst. Although similar rapid ligand substitution occurs with other supramolecules, the pyridine and Cl anions accelerate the decomposition of the supramolecular photocatalysts.

Graphical abstract: Highly efficient supramolecular photocatalysts for CO2 reduction using visible light

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Publication details

The article was received on 15 Sep 2006, accepted on 26 Oct 2006 and first published on 10 Nov 2006


Article type: Paper
DOI: 10.1039/B613419J
Citation: Photochem. Photobiol. Sci., 2007,6, 454-461
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    Highly efficient supramolecular photocatalysts for CO2 reduction using visible light

    S. Sato, K. Koike, H. Inoue and O. Ishitani, Photochem. Photobiol. Sci., 2007, 6, 454
    DOI: 10.1039/B613419J

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