A Dinuclear Cobalt Cryptate as a Homogeneous Photocatalyst for Highly Selective and Efficient Visible‐Light Driven CO2 Reduction to CO in CH3CN/H2O Solution. (13th December 2016)

• Record Type: Journal Article
• Authors: Ouyang, Ting; Huang, Hai‐Hua; Wang, Jia‐Wei; Zhong, Di‐Chang; Lu, Tong‐Bu
• Is Part Of: Angewandte Chemie. Volume 129:Number 3(2017)
• Page Start: 756
• Page End: 761
• Publication Date: 2016-12-13
• Subjects: CO2-Reduktion -- Cobalt-Komplexe -- DFT-Rechnungen -- Homogene Photokatalysatoren -- Synergistische Katalyse; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201610607
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: A dinuclear cobalt complex [Co2 (OH)L 1 ](ClO4 )3 (1, L 1 =N[(CH2 )2 NHCH2 ( m ‐C6 H4 )CH2 NH(CH2 )2 ]3 N) displays high selectivity and efficiency for the photocatalytic reduction of CO2 to CO in CH3 CN/H2 O (v/v=4:1) under a 450 nm LED light irradiation, with a light intensity of 100 mW cm −2 . The selectivity reaches as high as 98 %, and the turnover numbers (TON) and turnover frequencies (TOF) reach as high as 16896 and 0.47 s −1, respectively, with the calculated quantum yield of 0.04 %. Such high activity can be attributed to the synergistic catalysis effect between two Co II ions within 1, which is strongly supported by the results of control experiments and DFT calculations. Abstract : CoCo‐Katalysatoren : Ein zweikerniges Cobaltcryptat zeigt hohe Selektivität und Effizienz in der photokatalytischen Reduktion von CO2 zu CO in CH3 CN/H2 O‐Lösung unter Bestrahlung mit LED‐Licht von 450 nm bei einer Lichtintensität von 100 mW cm −2 . Die hohe katalytische Effizienz wird auf einen synergistischen Katalyseeffekt zwischen den zwei Co II ‐Zentren im Katalysator zurückgeführt.