새로운 산소-질서(N2O2)계 네 자리 리간드의 합성과 전이금속 착물 안정도상수에 대한 치환기 효과
Synthesis of new N2O2 tetradentate ligands and the substituent effect on the stability constants of the transition metal complexes
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Abstract
Hydrobromic acid salt of a N2O2 tetradentate ligand, N,N'-bis(2-hydroxybenzyl)-ethylene-diamine(H-BHE.2HBr) was synthesized. Br-BHE.2HBr, Cl-BHE.2HBr, CH3-BHE.2HBr and CH3O-BHE.2HBr3 and CH3O substituents at 5-position of the phenol group of H-BHE.2HBr were alsosynthesized. Nap-BHE.2HBr having naphthalen-2-ol instead of the phenol group was also synthesized. Thepotentiometry study in aqueous solution revealed that the proton dissociations of the synthesized ligands occurredin four steps and the order of the calculated overall proton dissociation constants (logβp) of each ligand wasBr-BHE < Cl-BHE < H-BHE < Nap-BHE < CH3-BHE < CH3O-BHE. The order showed a similar trend toδp). The order of the stability constants (logKML) was CO(II) < Ni(II)< Cu(II) > Zn(II) > Cd(II) > Pb(II). The order in their stability constants (logKML) of each transition metal complexagreed wel with that of the overall proton dissociation constants (logβp).
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