Anion complexation by amido derivatives of p-tert-butyl calix[4]arene

The binding properties of 1,2,3,4-amido derivatives of p-tert-butyl calix[4]arene (4–6) towards various anions (spherical halides, planar trigonal nitrate and tetrahedral hydrogen sulphate) as their tetrabutyl ammonium (TBA) salts have been studied by 1H NMR technique and using Equi Chem program. The stability constants, log K ass, varying from 0.76 ± 0.10 to 2.13 ± 0.04 have been determined for the mononuclear complexes. Anion complexation by amido derivatives of p-tert-butyl calix[4]arene Abdelwaheb Hamdi, Rym Abidi and Jacques Vicens 1 R = R′ = CH2COOCH3 2 R = H ; R′ = CH2CONH-benzyl 3 R = R′ = CH2CONH-benzyl 4 R = R′ = CH2CONHCH2-furane 5 R = R′ = CH2CONHCH2-thiophene 6 R = R′ = CH2CONH(CH2)2O(CH2)2OH