Syntheses of New Nitrogen-Oxygen Multidentate Ligands and Their Stability Constants of Transition Metal(Ⅱ) Ions

새로운 질소-산소계 여러 자리 리간드의 합성 및 전이금속(Ⅱ)이온 착물의 안정도상수

  • 김선덕 (대구대학교 자연과학대학 화학과) ;
  • 장기호 (대구대학교 자연과학대학 화학과) ;
  • 김준광 (대구대학교 자연과학대학 화학과)
  • Published : 19981000

Abstract

Multidentate N,O-containing ligands, such as N,N'-bis(2-hydroxybenzyl)-ethylenediamine(BHED), N,N'-bis(2-hydroxybenzyl)-propylenediamine(BHPD), N,N'-bis(2-hydroxybenzyl)-diethylenetriamine(BHDT), N,N'-bis(2-hydroxybenzyl)-triethylenetriamine(BHTT) and N,N'-bis(2-hydroxybenzyl)-tetraethylenepentaamine (BHTP) were synthesized by reduction of the imine group of Bis(salicylidene)-ethylendiamine(BSED), Bis (salicylidene)-propylenediamine(BSPD), Bis(salicylidene)-diethylentriamine(BSDT), Bis(salicylidene)-triethylenetetraamine(BSTT) and Bis(salicylidene)-tetraethylenepentaamine(BSTP). Proton dissociation constants of the ligands and stability constants of transition metal(Ⅱ) ion complexes with BHED, BHPD, BHDT, BHTT, and BHTP were determined by potentiometic titration. The sequence of stability constants $(logK_{ML})$ of complex increases as BHED Zn(Ⅱ) which follows the Irving-Williams series.

Keywords

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