Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Synthesis of Schiff-Base Ligands and Determination of Stability Constants of Their Transition Metal(II) Complexes

질소-산소계 시프염기 리간드의 합성과 전이금속(II) 착물의 안정도상수결정

  • 김선덕 (대구대학교 자연과학대학 화학과) ;
  • 송찬익 (대구대학교 사범대학 과학교육학부) ;
  • 김준광 (대구대학교 사범대학 과학교육학부) ;
  • 김정성 (대구대학교 사범대학 과학교육학부)
  • Published : 2004.09.01
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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- $5-methoxy-benzaldehyde)dipropylenetriamine(5-OCH_3saldipn)$ 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

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