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Synthesis, characterization and thermodynamic properties of metal complexes of a phenanthroline-bridging macrocyclic ligand

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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 -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.
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Keywords: Dioxotetraamine macrocycles; LFER; Metal complexes; Phenanthroline; Thermodynamics; α-Amino acids

Document Type: Research Article

Publication date: January 10, 2004

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