Abstract
The protonation equilibria of glycyl-glycine and its complex formation with the cerium(IV) ion in aqueous solution were studied over a wide pH range (2 to 12) using a combination of potentiometric and spectrophotometric methods at constant temperature (25 °C) and different ionic strengths [(0.02, 0.05, 0.10, 0.15, 0.30, 0.50, 0.70, and 1.00) mol·dm–3 sodium perchlorate]. Least-squares regression calculations are consistent with the formation of the CeL3+ and CeHL4+ species for the studied system, where L– represents the deprotonated peptide. The species concentrations were plotted at different pH values and were discussed. The dependence of the protonation of the ligand and the stability constant of the complex species on ionic strength is described by a Debye–Huckel type equation, and finally the results have been compared with the values reported previously and interpreted.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
