Photosensitization Behavior of 1011) Complexes in Selective Reduction of CO2 by Re(I)-Complex-Anchored TiO2 Hybrid Catalyst
- Authors
- Cheong, Ha-Yeon; Kim, So-Yoen; Cho, Yang-Jin; Cho, Dae Won; Kim, Chul Hoon; Son, Ho-Jin; Pac, Chyongjin; Kang, Sang Ook
- Issue Date
- 2-10월-2017
- Publisher
- AMER CHEMICAL SOC
- Citation
- INORGANIC CHEMISTRY, v.56, no.19, pp.12042 - 12053
- Indexed
- SCIE
SCOPUS
- Journal Title
- INORGANIC CHEMISTRY
- Volume
- 56
- Number
- 19
- Start Page
- 12042
- End Page
- 12053
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/81945
- DOI
- 10.1021/acs.inorgchem.7b01963
- ISSN
- 0020-1669
- Abstract
- A series of cationic Ir(III) complexes ([Ir(btp)(2)(bpy-X-2)](+) (Ir-X+ btp = (2-pyridyl)benzo[b]thiophen-3-yl; bpy-X-2 = 4,4'-X(2)2,2'- (X = OMe, Bu-t, Me, H, and CN)) were applied as visible-light photosensitizer to the CO2 reduction to CO using a hybrid catalyst (TiO2/ReP) prepared by anchoring of Re(4,4'-Y-2-bpy)(CO)(3)Cl (Rd); Y = CH2PO(OH)(2)) on TiO2 particles. Irradiation of a solution containing Ir-X+, TiO2/ReP particles, and an electron donor (1,3-dimethy1-2-phenyl-1,3-dihydrobenzimidazole) in N,N-dimethylformamide at greater than 400 nm resulted in the reduction of CO2 to CO with efficiencies in the order X = OMe > Bu-t approximate to Me > H; Ir-CN+ has no photosensitization effect. A notable observation is that Ir-Bu-t(+) and Ir-Me+ are less efficient than Ir-OMe+ at an early stage of the reaction but reveal persistent photosensitization behavior for a much longer period of time unlike the latter. Comparable experiments showed that (1) the Ir-X+ sensitizers are commonly superior compared to Ru(bpy)(3)(2+), a widely used transition -metal photosensitizer, and (2) the system comprising Ir-OMe+ and TiO2/ReP is much more efficient than a homogeneous -solution system using Ir-OMe+ and Re(4,41-Y'(2)-bpy)(CO)(3)Cl (Y' = CH2PO(OEt)(2)). Implications of the present observations involving reaction mechanisms associated with the different behavior of the photosensitizers are discussed in detail.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - Graduate School > Department of Advanced Materials Chemistry > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.