Document Type : Research Paper
The interaction of p-sulphonatocalix  arene towards L-arginine and L-lysine has been studied in
acidic aqueous solution (p1-1 2) using UV-Vis spectrophotometric titration technique. The psulphonatocalix
 arene was found to be able to form 1:1 complexe with amino acids in water.
The values of the association constant were determined at different temperatures to evaluate the
thermodynamic functions of the complexation reaction. The thermodynamics values of complexes
were compared to each other.