Volume 2, Issue 5, October 2014, Page: 74-79
Effect of Substituent Groups in Rhenium Bipyridine Complexes on Photocatalytic CO2 Reduction
Yoko Ono, NTT Energy and Environment Systems Laboratories, Kanagawa, Japan; Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa, Japan
Jiro Nakamura, NTT Energy and Environment Systems Laboratories, Kanagawa, Japan
Masahiko Hayashi, NTT Energy and Environment Systems Laboratories, Kanagawa, Japan; Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa, Japan
Kazue Ichino Takahashi, NTT Energy and Environment Systems Laboratories, Kanagawa, Japan; Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa, Ishikawa, Japan
Received: Aug. 27, 2014;       Accepted: Sep. 20, 2014;       Published: Sep. 30, 2014
DOI: 10.11648/j.ajac.20140205.12      View  3550      Downloads  280
Abstract
We synthesized four different rhenium complexes, Re(bpy-R)(CO)3Cl (bpy = 2,2-bipyridine and R = H, CH3, COOH, or CN), as photocatalysts that selectively reduce CO2 to CO and investigated the effect of substituent groups (Rs) on the absorption and photocatalystic properties for CO2 reduction under 365-nm light irradiation. The Re(bpy-R)(CO)3Cl (R = H or CH3 or COOH) reduced CO2 to CO in CO2-saturated DMF-triethanolamine solution, which was irradiated with 365-nm light. The amount of CO produced by CO2 reduction differed, depending on the introduced Rs in the bipyridine moiety. We found that the ability of Re(bpy-R)(CO)3Cl (R = H or CH3 or COOH) to produce CO has a linear relationship to molar absorption coefficients of rhenium complexes at the irradiated light wavelength. Introduction of the COOH group, which has the highest molar absorption coefficient among four rhenium complexes, enhanced CO2-to-CO reduction capacity (6.59 mol/cat-mol2h) five times that of Re(bpy-H)(CO)3Cl with no R.
Keywords
CO2 Reduction, Photocatalyst, Rhenium Bipyridine Complex
To cite this article
Yoko Ono, Jiro Nakamura, Masahiko Hayashi, Kazue Ichino Takahashi, Effect of Substituent Groups in Rhenium Bipyridine Complexes on Photocatalytic CO2 Reduction, American Journal of Applied Chemistry. Vol. 2, No. 5, 2014, pp. 74-79. doi: 10.11648/j.ajac.20140205.12
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