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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 30, Number 1
JKCSEZ 30(1)
February 20, 1986 

 
Title
Cobalt(Ⅲ) Complex of Ethylenediamine-N,N'-di-α-Isobutyric Acid

Ethylenediamine-N,N'-di-α-Isobutyric Acid의 코발트(Ⅲ) 착물
Author
Moo-Jin Jun, Chang-Yoon Han, Chang-Woo Park, Sung Rack Choi, Kwang-Ha Park

전무진, 한창륜, 박장우, 최승락, 박광하
Keywords
Abstract
주게원자가 ONNO인 새로운 네자리 리간드인 ethylenediamine-N,N'-di-α-isobutyric acid(eddib)를 합성하고 이 리간드의 디클로로 코발트(Ⅲ)착물을 공기산화법에 의하여 합성하였다. Eddib리간드가 코발트(Ⅲ)이온에 배위될 때 S-cis이성체만이 선택적으로 만들어짐이 관찰되었는데 이것은 ring strain과 steric hinderance 때문이다. 그리고 eddib의 디클로로 코발트 (Ⅲ)착물을 용액중에서 [Co(eddib)L]n+ (L = Cl·(H2O), CO32-, (H2O)2)로 치환반응을 시켰을 때 이들의 흡수 스펙트럼의 흡수띠 위치가 분광학적계열과 일치함을 알 수 있었다. 합성된 착물의 구조는 원소분석, 적외선 흡광분석법, 핵자기 공명 및 전자흡수 스펙트럼으로 확인하였다.

A newflexible N2O2-type tetradentate ligand. Ethylenediamine-N,N'-di-α-isobutyric acid(eddib), has been synthesized, and dichloro cobalt(Ⅲ) complex of eddib has been prepared via the air-oxidation technique. Only S-cis isomer has been yielded during the preparation of complex. Ring strain and steric hinderance are cited as the cause for the preference for the S-cis geometric configuration. On series of cobalt(Ⅲ) complexes of eddib, [Co(eddib)L]n+ (L = Cl·(H2O), CO32-, (H2O)2) have been prepared in situ. In their electronic absorption spectra, the absorption maxima and their intensities of the above series of complexes are on the ordinary line of the spectrochemical and hyperchromic series. Elemental analysis, IR, NMR and electronic absorption spectra have been used to characterize the complex and geometries of the complex.

Page
84 - 89
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