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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- <TEX>$5-methoxy-benzaldehyde)dipropylenetriamine(5-OCH_3saldipn)$</TEX> and N,N-bis (2-hydroxy-5-nitrobenzaldehyde)dipropylenetriamine <TEX>$(5-NO_2saldipn)$</TEX> 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 <TEX>$5-OCH_3$</TEX> > 5-H > 5-Br > 5-Cl > <TEX>$5-NO_2$</TEX> saldipn. Enthalpy and entropy changes were obtained in negative values.
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