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http://dx.doi.org/10.5322/JES.2004.13.9.835

Synthesis of Schiff-Base Ligands and Determination of Stability Constants of Their Transition Metal(II) Complexes  

Kim, Seon Deok (대구대학교 자연과학대학 화학과)
Song, Chan Ik (대구대학교 사범대학 과학교육학부)
Kim, Jun Gwang (대구대학교 사범대학 과학교육학부)
Kim, Jeong Seong (대구대학교 사범대학 과학교육학부)
Publication Information
Journal of Environmental Science International / v.13, no.9, 2004 , pp. 835-843 More about this Journal
Abstract
N,N-bis(2-salicylaldehyde)dipropylenetriamine(5- Hsaldipn), N,N-bis( 5-bromosalicyl-aldehyde) dipropylenetriamine (5-Brsaldipn), N,N-bis(5-chlorosalicy laldehyde )dipropylene-triamine(5-Clsaldipn), N,N-bis(2-hydroxy- $5-methoxy-benzaldehyde)dipropylenetriamine(5-OCH_3saldipn)$ and N,N-bis (2-hydroxy-5-nitrobenzaldehyde)dipropylenetriamine $(5-NO_2saldipn)$ were synthesized and characterized by elemental analysis, infrared spectrometry, NMR spectrometry and mass spectrometry. Their proton dissociation constants were determined in 70% dioxane/30% water solution by potentiometric. Stability constants of the complexes between these ligands and the metal ions such as Cu(II), Ni(II) and Zn(II) were measured in dimethyl sulfoxide by a polarographic method. Stability constants for the ligands were in the order of $5-OCH_3$ > 5-H > 5-Br > 5-Cl > $5-NO_2$ saldipn. Enthalpy and entropy changes were obtained in negative values.
Keywords
Proton dissociation; Stability constants; Polarographic;
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