Abstract: | The polydentate ligands, 3-(2-aminocyclohexylamino)-2-(2-aminocyclohexyl aminomethyl) propionic acid (L1 ), 4,7,10-triazatridecanedinitrile trihydrochloride (L2 ), and 2,2′-(ethane-1,2-diyl) bis(methylazanediyl) diethanol (L3 ) were prepared and their structures investigated by FT-IR, NMR, and MS. The kinetics of complex formation between Cu(II) and L1, L2, and L3 were investigated in acidic aqueous solutions using the stopped-flow method. The stability constants of the complexes were determined by spectrophotometric titration (T?=?293?K, μ?=?0.1?mol?L?1 NaClO4), using a diode array UV-Vis spectrophotometer equipped with peristaltic pump and pH meter. The stability constants for the complexes were CuL1?>?CuL2?>?CuL3. Activation enthalpies (ΔH#) of these complexes were 55?kJ?mol?1 for CuL1, 61?kJ?mol?1 for CuL2, and 36?kJ?mol?1 for CuL3, respectively. |