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  • Title: Cation-pi 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.
    Author: Haddadi H, Alizadeh N, Shamsipur M, Asfari Z, Lippolis V, Bazzicalupi C.
    Journal: Inorg Chem; 2010 Aug 02; 49(15):6874-82. PubMed ID: 20608710.
    Abstract:
    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 (203)Tl and (1)H NMR in a CD(3)CN/CDCl(3) (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 TlClO(4) 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 pi cavities as active sites for the complexation of thallium(I) ions.
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