Cation−π Interaction in Complex Formation Between Tl+ Ion and Calix[4]crown-6 and Some Calix[4]biscrown-6 Derivatives: Thallium-203 NMR, Proton NMR, and X-ray Evidence

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• 作者：Hedayat Haddadi ; Naader Alizadeh ; Mojtaba Shamsipur ; Zouhair Asfari ; Vito Lippolis ; Carla Bazzicalupi
• 刊名：Inorganic Chemistry
• 出版年：2010
• 出版时间：August 2, 2010
• 年：2010
• 卷：49
• 期：15
• 页码：6874-6882
• 全文大小：1039K
• 年卷期：v.49,no.15(August 2, 2010)
• ISSN：1520-510X

文摘

Metallocapped complexation of the thallium(I) ion with calix[4]crown-6 (1) and three different calix[4]biscrown-6 derivatives (2−4) has been investigated by a combination of ²⁰³Tl and ¹H NMR in a CD₃CN/CDCl₃ (4:1 v/v) solution. The results clearly revealed the formation in solution of mono- and dithallium(I) complexes in which the metal cations are held in the ligands’ cavities close to the calix[4]arene ring. In addition, a solid state mononuclear complex between 1,3-calix[4]bis-o-benzo-crown-6 (3) and TlClO₄ was prepared, and its X-ray crystal structure was determined. The results of the structural data in solution and the solid state suggested that the calix[4]crown-6 derivatives considered provide π cavities as active sites for the complexation of thallium(I) ions.