- P-ISSN 1225-0163
- E-ISSN 2288-8985
산소-질소를 포함하는 여러 자리 시프염기 리간드인 비스-살리실알데히드-에틸렌디이민(SED), 비스-살리실알데히드-프로필렌디이민(SPD), 비스-살리실알데히드-디에틸렌트리이민(SDT), 비스-살리실알데히드-트리에틸렌테트라이민(STT) 및 비스-살리실알데히드-테트라에틸 렌펜타이민(STP) 등을 합성하고 이들 리간드들을 에탄올과 70% 디옥산 수용액에서 전위차법으로 넷, 다섯 및 여섯 단계의 양성자 해리상수값을 구하였다. 구리(II)-시프염기 착물의 안정도상 수값의 크기는 Cu(II)-SPD<Cu(II)-SED<Cu(II)-SDT<Cu(II)-STT<Cu(II)-STP의 순서로서 주개 원자수에 따라서 증가하였다. 순환 전압-전류법으로 얻은 착물들의 환원전위값은 Cu(II)-SPD<Cu(II)-SDT<TEX>${\leq}$</TEX>Cu(II)-SED~STT<TEX>${\leq}$</TEX>Cu(II)-STP 순서로 음전위쪽으로 이동하였다. Cu(II)-시프염기 착물의 산화-환원 과정은 일전자 반응이었다.
Algal(II) Multidentate N, O-Schiff base ligands, such as bis(salicylaldehyde) ethylenediimine(SED), bis(salicylaldehyde) propylenediimine(SPD), bis(salicylaldehyde) diethylenetriimine(SDT), bis (salicylaldehyde) triethylenetetraimine(STT) and bis(salicyl-aldehyde)tetraethylenepentaimine(STP) were prepared. Stepwise proton dissociation constants of the Schiff base were measured potentiometrically in ethanol and a mixture of 70% dioxane and 30% <TEX>$H_2O$</TEX>. The stability constants of copper(II)-Schiff base complexes were in the order of Cu(II)-SPD<Cu(II)-SED<Cu(II)-SDT<Cu(II)-STT<Cu(II)-STP and were increased with the number of donor atoms. Reduction potentials obtained by cyclovoltagram were shifted to the negative potential in the order of Cu(II)-SPD<Cu(II)-SDT<TEX>${\leq}$</TEX>Cu(II)-SED~STT<TEX>${\leq}$</TEX>Cu(II)-STP. Oxidation-reduction process of the Cu(II)-Schiff base complexes was involved with one-electron reaction.