期刊
JOURNAL OF CATALYSIS
卷 322, 期 -, 页码 139-151出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2014.12.005
关键词
Mesoporous silica nanoparticles; Tridentate copper complex; C-H bond activation; Toluene oxidation; Benzaldehyde; Benzyl alcohol
资金
- National Science Council of Taiwan [NSC 100-2120-M-002-001]
A tripodal tridentate copper(II) complex, CuImph (Imph = bis(4-imidazolyl methyl)benzylamine), is synthesized to mimic the active site of copper enzymes that mediate the oxidation of aliphatic C-H bonds under mild condition. By immobilizing the model complex in the nanochannels of functionalized mesoporous silica nanoparticles (MSNs), we observe the formation of a stable bis-mu-oxo species ([I{Cu(III)Imph}(2)(mu-O2-)(2)](2+)) in the presence of dioxygen or air at ambient temperature. The dioxygen-activated CuImph@MSN samples show high reactivity and selectivity toward toluene aliphatic C-H bond oxidation, converting the toluene initially to benzyl alcohol and subsequently to benzaldehyde as the major product in a kinetic consecutive reaction. No evidence for benzoic acid is obtained, unlike the over-oxidation typically associated with present-day industrial processes operating at high temperatures. In addition, the process is self-sustaining without the requirement for a sacrificial reductant to drive the catalytic turnover. The catalyst can be fully recovered and re-used for several cycles without decay of activity. (C) 2014 Elsevier Inc. All rights reserved.
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