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

중금속 이온 분리를 위한 새로운 네 자리 N2O2계 리간드의 합성 및 착 화합물의 안정도상수 결정

  • 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)
  • 김선덕 (대구대학교 화학.응용화학과) ;
  • 김준광 (을지대학교 피부관리학과) ;
  • 이경호 (경주대학교 환경공학과)
  • Published : 2007.08.31

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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