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KMID : 1024520040130090835
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Journal of the Environmental Sciences
2004 Volume.13 No. 9 p.835 ~ p.843
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Synthesis of Schiff-Base Ligands and Determination of Stability Constants of Their Transition Metal(II) Complexes
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Kim Sun-Deuk
Song Chan-Ik
Kim Jun-Gwang
Kim Jung-Sung
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Abstract
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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- and N,N-bis (2-hydroxy-5-nitrobenzaldehyde)dipropylenetriamine 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-H > 5-Br > 5-Cl > saldipn. Enthalpy and entropy changes were obtained in negative values.
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KEYWORD
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Proton dissociation, Stability constants, Polarographic
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