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http://dx.doi.org/10.5322/JES.2007.16.8.913

Synthesis of New N2O2 Tetradentate Ligands and Determination of Stability Constants of Metal Complexes for Removal of Heavy Metals  

Kim, Sun-Deuk (Department of Chemistry and Applied Chemistry, Daegu University)
Kim, Jun-Kwang (Department of Skin Management, Euiji University)
Lee, Kyung-Ho (Department of Environmental Engineering, Gyeongju University)
Publication Information
Journal of Environmental Science International / v.16, no.8, 2007 , pp. 913-920 More about this Journal
Abstract
Hydrochloride acid salts of new $N_2O_2$ tetradentate ligands containing amine and phenol N,N'-bis(2-hydroxybenzyl)-o-phenylenediamine(H-BHP), N,N'-bis(5-bromo-2-hydroxybenzyl)-o-phenylenediamine(Br-BHP), N,N'-bis(5-chloro-2-hydroxybenzyl)-o-phenylene-diamine(Cl-BHP), N,N'-bis(5-methyl-2-hydroxybenzyl)-o-phenylene-diamine (Me-BHP) and N,N'-bis(5-methoxy-2-hydroxybenzyl)-o-phenylenediamine(MeO-BHP) were synthesized. The ligands were characterized by elemental analysis, mass and NMR spectroscopy. The elemental analysis showed that the ligands were isolated as dihydrochloride salt. The potentiometry study revealed that the proton dissociation constants$(logK_n{^H})$ of ligands and stability constants $(logK_{ML})$ of transition and heavy metals complexes. The order of the stability constants of each metal ions for ligands was Br-BHP < Cl-BHP > H-BHP < MeO-BHP < Me-BHP.
Keywords
Tertadentate ligands; Proton dissociation constants; Stability constants;
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