Endo-Complexation of Alkylammonium Ions by Calix[4]arene Cavity: Facilitating Cation鈭捪€ Interactions through the Weakly Coordinating Anion Approach

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• 作者：Carmen Talotta ; Carmine Gaeta ; Placido Neri
• 刊名：Journal of Organic Chemistry
• 出版年：2014
• 出版时间：October 17, 2014
• 年：2014
• 卷：79
• 期：20
• 页码：9842-9846
• 全文大小：319K
• ISSN：1520-6904

文摘

Notwithstanding its small dimensions, the narrow cavity of p-tert-butylcalix[4]arene macrocycle is still able to host alkylammonium guests in the presence of the tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (TFPB^{鈥?/sup>) weakly coordinating (or 鈥渟uperweak鈥? anion. As an artificial analogue of biological receptors, cone-shaped calix[4]arene 1d is able to recognize a n-BuNH₃+ guest mainly through a 4-fold cation鈭捪€ interaction aided by a weak H-bonding interaction. This recognition motif can be used to assembly a 2:1 capsular architecture with a linear diammonium axle.}