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http://dx.doi.org/10.5322/JES.2012.21.4.421

Syntheses of Tetradentate Nitrogen-Oxygen(N2O2)) Ligands with Substituents and the Determination of Stability Constants of Their Heavy(II) Metal Complexes  

Kim, Sun-Deuk (Department of Chemistry and Applied Chemistry, Daegu University)
Seol, Jong-Min (Department of Chemistry and Applied Chemistry, Daegu University)
Publication Information
Journal of Environmental Science International / v.21, no.4, 2012 , pp. 421-435 More about this Journal
Abstract
Novel $N_2O_2$ 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, $^{13}C$ NMR, UV-visible, and mass spectra. The proton dissociation constants ($logK_n{^H}$) of the phenol hydroxyl group and secondary amine of the synthesized $N_2O_2$ ligands were shown by four step wise values. The orders of the calculated overall proton dissociation constants ($log{\beta}_p$) were Br-3BPD < Cl-3BPD < H-3BPD in case of 3BPD and Br-2BPD < Cl-2BPD < H-2BPD in case of 2BPD respectively. The order agreed well with that of $para$ Hammett substituent constants(${\delta}_p$). The stability constants($logK_{ML}$) of the complexes between the synthesized ligands and transition metal(II) ions agreed with the order of $log{\beta}_p$ of the ligands. The order of the $logK_{ML}$ value of the each transition metal (II) ion was Co(II) < Ni(II) < Cu(II) > Zn(II) > Cd(II) > Pb(II), which agreed well with that of Iriving-Williams series.
Keywords
$N_2O_2$ pentadentate ligands; Overall proton dissociation constants; Stability constants;
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