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Synthesis of New Nitrogen-Oxygen(N3O2) Pentadentate Ligands and the Substituent Effect on the Stability Constants of the Heavy(II) Metal Complexes
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 Title & Authors
Synthesis of New Nitrogen-Oxygen(N3O2) Pentadentate Ligands and the Substituent Effect on the Stability Constants of the Heavy(II) Metal Complexes
Kim, Sun-Deuk; Lee, Hye-Won; Seol, Jong-Min;
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A new pentadentate ligand, N,N'-Bis(2-hydroxybenzyl)-ethylenetriamine(H-BHET 3HCl) was synthesized. The hydrochloric acid salts of Br-BHET 3HCl, Cl-BHET 3HCl, -BHET 3HCl and -BHET 3HCl containing Br-, Cl-, H-, and groups at the para-site of the phenol group of the H-BHEP were synthesized. The structures of the ligands were confirmed by C. H. N. atomic analysis and NMR, NMR, UV-visible and mass spectra. The calculated stepwise protonation constants() of the synthesized ligands showed six steps of the proton dissociation. The orders of the overall protonation constants() of the ligands were Br-BHET < Cl-BHET < H-BHET < -BHET < -BHET. The orders agreed well with that of para Hammett substituent constants(). The calculated stability constants() between the ligands and heavy metal ions (Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Pb(II)) agreed well with the order of the overall proton dissociation constants of the ligands but they showed a reverse order in para Hammestt substituent constants(). The order of the stability constants between the heavy metal ions with the synthesized ligands were Co(II) < Ni(II) < Cu(II) > Zn(II) > Cd(II) > Pb(II).
Pentadentate ligand;Dissociation constants;Stability constants;Heavy metal ions;
 Cited by
치환기를 가진 질소-산소(N3-O2)계 리간드 합성과 중금속(II)이온 착물의 안정도상수 결정,김선덕;설종민;

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