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KMID : 1024520120210040421
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Journal of the Environmental Sciences
2012 Volume.21 No. 4 p.421 ~ p.435
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Syntheses of Tetradentate Nitrogen-Oxygen(N2O2)) Ligands with Substituents and the Determination of Stability Constants of Their Heavy(II) Metal Complexes
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Kim Sun Deuk
Seol Jong-Min
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Abstract
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Novel N2O2 tetradentate ligands, H-3BPD and H-2BPD were synthesized. Hydrochloric acid salts of Br-3BPD, Cl-3BPD,
Br-2BPD and Cl-2BPD having Br and Cl substituents at the para position of the phenol hydroxyl group, were synthesized.
The ligands were characterized by C. H. N atomic analysis, 1H NMR, 13C NMR, UV-visible, and mass spectra. The proton dissociation constants (logKnH) of the phenol hydroxyl group and secondary amine of the synthesized N2O2 ligands were shown by four step wise values. The orders of the calculated overall proton dissociation constants (logβp) were Br-3BPD Zn(Ⅱ) > Cd(Ⅱ) > Pb(Ⅱ), which agreed well with that of Iriving-Williams series.
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KEYWORD
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N_2 O_2 pentadentate ligands, Overall proton dissociation constants, Stability constants
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