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学科主题: 物理化学
题名: Encapsulation of chiral Fe(salan) in nanocages with different microenvironments for asymmetric sulfide oxidation
作者: Li, Bo1;  Bai, Shiyang1;  Wang, Peng1;  Yang, Hengquan1;  Yang, Qihua1;  Li, Can1
通讯作者: 杨启华 ;  李灿
刊名: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
发表日期: 2011
DOI: 10.1039/c0cp01828g
卷: 13, 期:7, 页:2504-2511
收录类别: SCI
文章类型: Article
部门归属: 5
项目归属: 506;503
产权排名: 1,1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
摘要: Encapsulation of chiral Fe(salan) in nanocages with different microenvironments for asymmetric sulfide oxidation
研究领域[WOS]: Chemistry ;  Physics
英文摘要: The solid catalysts for asymmetric oxidation of sulfides were prepared by encapsulating a chiral iron salan complex [Fe(salan)] in the nanocages of mesoporous silicas. The microenvironment of nanocages was finely tuned using silylation reagents with different kinds of organic groups, such as propyl (C3), 1-butyl-3-propyl-4,5-dihydroimidazolium bromide (ILBr), N-propyl-N,N,N-tri-n-butylammonium chloride (TBNCl) and N-propyl-N, N, N-tri-n-butylammonium bromide (TBNBr), and investigated by water and benzene adsorption. Fe(salan) encapsulated in the amphiphilic nanocage shows much higher enantioselectivity and activity than that in hydrophobic or hydrophilic nanocage for the asymmetric oxidation of thioanisole using H(2)O(2) as oxidant. The TOF of Fe(salan) encapsulated in the nanocage modified with TBNBr can reach as high as 220 h(-1), even higher than homogeneous Fe(salan) with a TOF of 112 h(-1). The enhanced catalytic activity is mainly due to the fast diffusion of H(2)O(2) and sulfide in the amphiphilic nanocage. The above results suggest that the microenvironment modification of the nanocage is an efficient method to synthesize highly efficient solid catalysts for asymmetric catalysis.
关键词[WOS]: AQUEOUS HYDROGEN-PEROXIDE ;  HIGHLY ENANTIOSELECTIVE OXIDATION ;  TWIN CORONET PORPHYRINS ;  KINETIC RESOLUTION ;  KEY INTERMEDIATE ;  IRON COMPLEXES ;  CATALYSTS ;  SULFOXIDATION ;  TEMPERATURE ;  OPC-29030
语种: 英语
WOS记录号: WOS:000286890500007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/115735
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Li, Bo,Bai, Shiyang,Wang, Peng,et al. Encapsulation of chiral Fe(salan) in nanocages with different microenvironments for asymmetric sulfide oxidation[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2011,13(7):2504-2511.
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