Issue 16, 2012

Binuclear rhenium(i) complexes for the photocatalytic reduction of CO2

Abstract

Binuclear rhenium(I) complexes with 1,2-bis(4,4′-methyl-[2,2′]bipyridyl)-ethane and 1,2-bis(4,4′-methyl-[2,2′]bipyridyl)-dodecane as bridging ligands and their mononuclear analogues have been synthesized and characterized by their spectroscopic and electrochemical properties. First reduction potentials and luminescence properties as well as the reductive quenching of the emissive state with TEOA were not affected by the alkyl linker. By means of a detailed comparison of the photocatalytic CO2 reductions of the monometallic and the bimetallic complexes a great beneficial effect on the activity depending on the proximity of the centres was found. In high dilution the overall kinetics in the CO2 photoreduction of mononuclear complexes are clearly monometallic. If the proximity of the centres is adjusted according to the lifetime of the OER (one electron reduced species) the photocatalytic activity is greatly improved showing a clear bimetallic mechanism. In the binuclear rhenium complexes, both the facile generation of a free coordination site and binuclear interactions for effective two electron transfer can be realized.

Graphical abstract: Binuclear rhenium(i) complexes for the photocatalytic reduction of CO2

Supplementary files

Article information

Article type
Paper
Submitted
07 Feb 2012
Accepted
10 Feb 2012
First published
14 Feb 2012

Dalton Trans., 2012,41, 5026-5037

Binuclear rhenium(I) complexes for the photocatalytic reduction of CO2

C. Bruckmeier, M. W. Lehenmeier, R. Reithmeier, B. Rieger, J. Herranz and C. Kavakli, Dalton Trans., 2012, 41, 5026 DOI: 10.1039/C2DT30273J

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