Abstract
A macrocyclic ligand incorporating phenanthroline has been synthesized by the reaction of 2,9-dichloromethyl-1,10-phenanthroline with dioxo[13]aneN4(dioxo[13]aneN4 = 1,4,7,11-tetraazacyclotridecane-8,10-dione). The stability constants of its Cu2+, Co2+, Hg2+ and Pd2+ metal complexes have been measured by potentiometric pH titration technique. It was found that a π-dp electrostatic interaction between Cu2+ and the phenanthroline moiety does exist in the binary systems. Stability constants of ternary systems containing Cu2+, ligand L(L1) and α-amino acids (AA, L2) in aqueous solution were also determined. Linear free energy relationships (LFER) exist in the ternary systems.
Acknowledgements
This project was supported by the National Science Foundation of the P.R. China (20371018) and the National Science Foundation of Tianjin (023605811).