Abstract
The synthesis and metal-ion complexation properties of two new derivatives of 1,3-di(carboxymethyl)-p-tert-butylcalix[4]arene, bis(2-thienylmethylamide) 3 and bis(furanylmethylamide) 4, have been studied using UV/Vis spectrophotometry and, in some cases, H-1-NMR spectroscopy. The cations examined are alkali metals (Li+, Na+, K+, Rb+ and Cs+), alkaline earth metals (Mg2+, Ca2+, Sr2+ and Ba2+), heavy metals (Ag+, Cd2+, Hg2+ and Pb2+), and lanthanides (La3+, Nd3+, Eu3+, Gd3+ and Yb3+).