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.
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.
Haddadi
Hedayat
H
Department of Chemistry, Faculty of Basic Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
Alizadeh
Naader
N
Shamsipur
Mojtaba
M
Asfari
Zouhair
Z
Lippolis
Vito
V
Bazzicalupi
Carla
C
D047250:Calixarenes / Q000737:chemistry*; D018360:Crystallography, X-Ray; D009682:Magnetic Resonance Spectroscopy; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D013379:Substrate Specificity; D013696:Temperature; D013793:Thallium / Q000737:chemistry*
D009942:Organometallic Compounds; D047250:Calixarenes; D013793:Thallium