Ion Pair Cooperative Binding of Potassium Salts by New Rhenium(I) Bipyridine Crown Ether Receptors

详细信息    查看全文

• 作者：Lindsay H. Uppadine ; James E. Redman ; Simon W. Dent ; Michael G. B. Drew ; and Paul D. Beer
• 刊名：Inorganic Chemistry
• 出版年：2001
• 出版时间：June 4, 2001
• 年：2001
• 卷：40
• 期：12
• 页码：2860 - 2869
• 全文大小：170K
• 年卷期：v.40,no.12(June 4, 2001)
• ISSN：1520-510X

文摘

The new rhenium(I) bipyridine crown ether receptors 1-4 have been prepared and their ion pair recognitionproperties examined. The crystal structure of [1·KCl]₂·2H₂O demonstrates that potassium is coordinated by benzo-18-crown-6 and chloride is hydrogen bonded to the amide groups. Receptor 3 extracts solid KCl and KOAc intochloroform via ion pair complexation. NMR and emission titration studies with receptors 1-4 and KCl/KOAcshow that cobound potassium enhances anion binding strength by electrostatic and conformational effects.Significant cooperative interactions are observed between the anion and cation sites for host 4 in CH₃CN. Thismolecule coordinates potassium to form a 1:1 intramolecular sandwich complex, which preorganizes the host foracetate binding.