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http://dx.doi.org/10.5012/jkcs.2010.54.5.541

Synthesis of Heptadentate Nitrogen-Oxygen Ligands (N4O3) with Substituting Groups and Determination of Stability Constants of Their Transition Metal(II) Complexes  

Kim, Sun-Deuk (Department of Chemistry and Applied Chemistry, Deagu University)
Lee, Do-Hyub (Department of Chemistry and Applied Chemistry, Deagu University)
Seol, Jong-Min (Department of Chemistry and Applied Chemistry, Deagu University)
Publication Information
Journal of the Korean Chemical Society / v.54, no.5, 2010 , pp. 541-550 More about this Journal
Abstract
A new $N_4O_3$ heptadentate ligand, N,N'-Bis(2-hydroxybenzyl)-1,3-bis[(2-aminoethyl)amino]-2-propanol(H-BAP 4HCl)was synthesized. The hydrochloric acid salts of Br-BAP 4HCl, Cl-BAP 4HCl, $CH_3O$-BAP 4HCl and $CH_3$-BAP 4HCl containing Br-, Cl-, H-, $CH_3O-$ and $CH_{3^-}$ groups at the para-site of the phenol group of the H-BAP were synthesized. The structures of the ligands were confirmed by C. H. N. atomic analysis and $^1H$ NMR, $^{13}C$ NMR, UV-visible and mass spectra. The elemental stepwise protonation constants(${logK_n}^H$) of the synthesized $N_4O_3$ ligands showed six steps of the proton dissociation. The orders of the overall dissociation constants($log{\beta}_p$) of the ligands were Br-BAP < Cl-BAP < H-BAP < $CH_3O$-BAP < $CH_3$-BAP. The orders agreed well with that of Hammett substituent constants($\sigma_p$). The calculated stability constants($logK_{ML}$) between the ligands and transition metal ions agreed well with the order of the overall proton dissociation constants of the ligands but they showed a reverse order in Hammestt substituent constants($\sigma_p$). The order of the stability constants between the transition metal ions with the ligands were Co(II) < Ni(II) < Cu(II) > Zn(II) > Cd(II) > Pb(II).
Keywords
$N_4O_3$ heptadentate ligand; Stepwise dissociation constants; Stability constants;
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