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http://dx.doi.org/10.5322/JES.2009.18.7.735

Synthesis of Pentadentate Nitrogen-Oxygen(N2O3) Ligands with Substituting Groups and Determination of Stability Constants of Their Transition Metal(II) Complexes  

Kim, Seon-Deuk (Department of Chemistry and Applied Chemistry, Daegu University)
Lee, Hye-Won (Department of Chemistry and Applied Chemistry, Daegu University)
Jin, Gyoung-Rok (Department of Chemistry and Applied Chemistry, Daegu University)
Publication Information
Journal of Environmental Science International / v.18, no.7, 2009 , pp. 735-746 More about this Journal
Abstract
Hydrochloric acid salt of a new $N_2O_3$ pentadentate ligand, N,N'-Bis(2-Hydroxybenzyl)-1,3-diamino-2-propanol(H-BHDP 2HCl) was synthesized. Br-BHDP 2HCl, CI-BHDP 2HCl, $CH_3-BHDP$ 2HCl and $CH_3O$-BHDP 2HCl having Br, Cl, $CH_3$ and $CH_3O$ substituents at 5-position of the phenol group of H-BHDP 2HCl were also synthesized. The potentiometry study in aqueous solution revealed that the proton dissociations of the synthesized ligands occurred in four steps and their order of the calculated overall proton dissociation constants($log{\beta}_p$) was Br-BHDP < Cl-BHDP < H-BHDP < $CH_3O-BHDP$ < $CH_3-BHDP$. The order showed a similar trend to that of Hammett substituent constants(${\delta}_p$). The order of the stability constants($logK_{ML}$) was Co(II) < Ni(II) < Cu(II) < Zn(II) < Cd(II) < Pb(II). The order in their stability constants ($logK_{ML}$) of each transition metal complex agreed with that of the overall proton dissociation constants ($log{\beta}_p$).
Keywords
$N_2O_3$ Pentadentate ligand; Dissociation constants; Stability constants;
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Times Cited By KSCI : 6  (Citation Analysis)
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