Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.apcatb.2017.07.050
Title: Influence of the halide and exposed facets on the visible-light photoactivity of bismuth oxyhalides for selective aerobic oxidation of primary amines
Authors: Han, Aijuan 
Zhang, Hongwei 
Chuah, Gaik-Khuan 
Jaenicke, Stephan 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Engineering, Environmental
Engineering, Chemical
Chemistry
Engineering
Bismuth oxyhalides
Photocatalyst
Selective oxidation
Visible light
Facet
PHOTOCATALYTIC ACTIVITY
CATALYTIC-OXIDATION
ARCHITECTURES
NETWORKS
IMINES
METAL
Issue Date: 15-Dec-2017
Publisher: ELSEVIER SCIENCE BV
Citation: Han, Aijuan, Zhang, Hongwei, Chuah, Gaik-Khuan, Jaenicke, Stephan (2017-12-15). Influence of the halide and exposed facets on the visible-light photoactivity of bismuth oxyhalides for selective aerobic oxidation of primary amines. APPLIED CATALYSIS B-ENVIRONMENTAL 219 : 269-275. ScholarBank@NUS Repository. https://doi.org/10.1016/j.apcatb.2017.07.050
Abstract: © 2017 Elsevier B.V. Bismuth oxyhalides BiOX (X = Cl, Br, I) are seldom applied as photocatalysts in organic synthesis. Herein, we investigated their potential for the aerobic oxidative coupling of benzylamine to N-benzylidenebenzylamine, as imines are important synthetic intermediates of pharmaceuticals and biologically active nitrogen-containing organic compounds. The influence of the halide and the exposed crystal facets on the photoactivity was investigated. BiOBr showed excellent photoactivity, surpassing BiOCl and BiOI, which have poor light absorption and oxidation ability, respectively. Three differently facetted BiOBr photocatalysts were synthesized. The {001}-facetted BiOBr exhibited higher intrinsic activity than the {010}- or {110}-samples due to efficient charge separation. However, surface area plays an important role as reactions usually occur at the catalyst surface. Because of their much larger surface area, the solvothermally-synthesized BiOBr microspheres with {110}-dominant exposed facet showed the highest photooxidative activity, with 100% conversion and 100% selectivity to N-benzylidenebenzylamine after 14 h visible light irradiation at room temperature using oxygen from atmospheric air. This work provides an economical, feasible, sustainable and green process for the synthesis of imines and illustrates the great potential of bismuth oxyhalides as photocatalysts for organic synthesis.
Source Title: APPLIED CATALYSIS B-ENVIRONMENTAL
URI: https://scholarbank.nus.edu.sg/handle/10635/155382
ISSN: 0926-3373
1873-3883
DOI: 10.1016/j.apcatb.2017.07.050
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