Author/Authors :
Tuntulani، نويسنده , , Thawatchai and Poompradub، نويسنده , , Sirilux and Thavornyutikarn، نويسنده , , Praput and Jaiboon، نويسنده , , Nongnuj and Ruangpornvisuti، نويسنده , , Vithaya and Chaichit، نويسنده , , Narongsak and Asfari، نويسنده , , Zouhair and Vicens *، نويسنده , , Jacques، نويسنده ,
Abstract :
Tripodal aza crown ether calix[4]arenes containing both cation and anion binding sites (5a and 5b) have been synthesized. The X-ray analysis shows that 5a forms a self-threaded rotaxane-like structure in the solid state. 1H NMR titrations of the two ligands with various halide anions indicate that 5a and 5b can form complexes with Br− and I− but not F−. However, both compounds form more stable complexes with I− than with Br− in the presence of Bu4N+. The presence of K+ enhances the binding ability of 5a towards Br−.
