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Unexpected wavelength dependency of the photocatalytic CO₂ reduction performance of the well-known (bpy)Re(CO)₃Cl complex
- LangThe authors P. Lang and R. Giereth contributed equally to this article., Philipp, Giereth, Robin, Tschierlei, Stefanie, Schwalbe, Matthias
- Chemical communications 2019 v.55 no.5 pp. 600-603
- carbon dioxide, carbon monoxide, filters, lighting, photocatalysis, spectroscopy, wavelengths
- The selective photocatalytic reduction of CO₂ to CO has often been accomplished using complexes incorporating the Re(CO)₃Cl fragment. We now discovered that the photocatalytic performance of the well-known parent compound (bpy)Re(CO)₃Cl (bpy = 2,2′-bipyridine) surprisingly depends on the illumination wavelengths: the turnover numbers (TONs) measured using various cut-off filters showed an increased photocatalytic activity when irradiated with visible light with wavelengths longer than 450 nm – even if the compound hardly absorbs light in this wavelength region. Therefore, catalytic, spectroscopic and theoretical investigations were performed to explain this exceptional effect.