KINETIC-STUDY ON THE FORMATION OF TERNARY COMPLEXES OF CO(II) 5-SUBSTITUTED PHENANTHROLINES AND ALPHA-AMINO-ACIDS

Kinetics on the formation of the ternary complexes Co(II)-5-substitute d phenanthrolines and alpha-aminoacids was studied by temperature-jump technique and their formation rate constants were determined at 25.0 +/- 0.1-degrees-C, I = 0.1 mol . dm-3 KNO3. The results show that line ar free energy relationships exist between the formation rate constant s of the ternary complexes and the protonation constant of 5-substitut ed phenanthrolines. The substituents of 5-substituted phenanthrolines influenced the formation rate constants of the ternary complexes. The dependence relationships of the rate constants of rate-determining ste p with the extent of back bonding were discussed.