Author/Authors :
Kim، نويسنده , , Jong Seung and Lee، نويسنده , , Won Ku and No، نويسنده , , Kwanghyun and Asfari، نويسنده , , Zouhair and Vicens *، نويسنده , , Jacques، نويسنده ,
Abstract :
Two 1,3-calix[4]azacrowns-5 in the 1,3-alternate conformation have been constructed from calix[4]arene. They formed 1:1 endo and 1:2 endo–endo complexes with NH4+ in CDCl3. Comparison with 1,3-calix[4]-bis-crown-5 lead us to conclude a better binding by replacement of the central O atom by NH group in the crown.
