69458-19-1Relevant articles and documents
Ionic interactions of anionic thiacalix[4]arene with cationic porphyrins
Garg, Bhaskar,Bisht, Tanuja,Chauhan, Shive Murat Singh
experimental part, p. 161 - 178 (2010/09/11)
A facile synthesis of 25,26,27,28-tetrakis(alkyloxy)-2,8,14,20- tetrathiacalix[4]arene-5,11,17,23-tetrasulfonate via ipso substitution of p-tert-butylthiacalix[4]arene tetraalkyl ether with sulfuric acid is described. Ionic interaction of anionic thiacalix[4]arene and cationic porphyrins were quantitatively studied by UV-vis, fluorescence, 1H NMR and ESI-MS spectrometry. Binding constants were in the range of 10 8 M -1. Binding with axial ligands was investigated and formation of ternary complexes was recognized with pyridine, 4-methylpyridine and Nmethylimidazole. The factors affecting the interaction process including pH, solvents and salts were also examined in detail. The results indicated that the neutral medium (pH = 7) is most favorable for electrostatic interactions. ARKAT USA, Inc.