Improved and Controlled Complexation of Paraquat Derivatives by the Formation of a Bis(m-phenylene)-26-Crown-8-Based Lariat Ether

被引:14
|
作者
Zhang, Mingming [1 ]
Luo, Yan [1 ]
Zheng, Bo [1 ]
Xia, Binyuan [1 ]
Huang, Feihe [1 ]
机构
[1] Zhejiang Univ, Dept Chem, Hangzhou 310027, Zhejiang, Peoples R China
基金
中国国家自然科学基金;
关键词
Crown compounds; Rotaxanes; Controlled assembly; Substituent effects; CROWN-ETHERS; GUEST; HOST; POLYPSEUDOROTAXANES; ORGANIZATION; CONVERSION; CRYPTAND; POLYMER; SALTS;
D O I
10.1002/ejoc.201000926
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
A novel bis(m-phenylene)-26-crown-8-based lariat ether (i.e., 3b) was synthesized and characterized. It can bind paraquat derivatives more strongly than bis(m-plaenylene)-26-crown-8 in solution. It forms pseudorotaxanes with two paraquat derivatives in the solid state. N-Methyl substitution was found to play an important role on the binding strength of lariat ether 3b. Furthermore, due to the introduction of two benzyloxy groups, its binding to paraquat derivatives can be switched off (and back on) by adding K+ (and then dibenzo-18-crown-6), and the disassociation percentage depends on the concentration of the added K+ ions.
引用
收藏
页码:5543 / 5547
页数:5
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