새로운 질소-산소계 여러 자리 리간드의 합성 및 전이금속(Ⅱ)이온 착물의 안정도상수 = Syntheses of New Nitrogen-Oxygen Multidentate Ligands and Their Stability Constants of Transition Metal(Ⅱ) Ions

다국어 초록 (Multilingual 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<BHPD<BHDT<BHTT<BHTP as the number of donor atom increases. The order of stability constant for the transition metal ions is CO(Ⅱ)<Ni(Ⅱ)<Cu(Ⅱ)> Zn(Ⅱ) which follows the Irving-Williams series.

국문 초록 (Abstract)

여러자리 산소-질소계 리간드들은 시프염기 리간드인 Bis(salicylidene)-ethylendiamine(BSED), Bis(salicylidene)-propylenediamine(BSPD), Bis(salicylidene)-diethylenetriamine(BSDT), Bis(salicylidene)-triethylenetetraamine(BSTT) 및 Bis(salicylidene)-tetraethylenepentaamine(BSTP)의 이민기를 수소환원장치에서 백금촉매를 이용하여 네자리 리간드인 N,N'-bis(2-hydroxybenzyl)-ethylenediamine(BHED)과 N,N'-bis(2-hydroxybenzyl)-propylenediamine(BHPD), 다섯자리 N,N'-bis(2-hydroxybenzyl)-diethylenetriamine(BHDT), 여섯자리 N,N'-bis(2-hydroxybenzyl)-triethylenetriamine(BHTT), 일곱자리 N,N'-bis(2-hydroxybenzyl)-tetraethylenepentaamine(BHTP) 리간드들을 합성하였다. 리간드들의 양성자 해리상수와 전이금속(Ⅱ)과 착물의 안정도상수는 전위차 적정법으로 측정하였다. 리간드별 전이금속(Ⅱ)이온에 대한 착물 안정도상수값$(logK_{ML})$의 크기는 BHED<BHPD<BHDT<BHTT<BHTP순서로 주개 원자수에 따라 증가하였다. 전이금속(Ⅱ) 이온들 사이의 착물 안정도 상수값의 크기는 코발트(Ⅱ)<니켈(Ⅱ)<구리(Ⅱ)>아연(Ⅱ)의 순서로 이 결과는 Irving-Williams 서열과 잘 일치하여 증가하였다.