Induced Circular Dichroism Spectra and Chromatography by Interaction of Some Racemic Cobalt (III) Complexes and d-Tartrate$^2$- in Aqueous Solution

d-주석산이온과 라세미코발트(III) 착물과의 상호작용에 따른 유발원편광이색성 Spectra와 크로마토그래피

  • Chang Eon Oh (Department of Science Education, Teachers College, Gyeong Sang National University) ;
  • Dae Ho Kang (Department of Science Education, Teachers College, Gyeong Sang National University) ;
  • Gab Choul Shin (Department of Science Education, Teachers College, Gyeong Sang National University)
  • 오창언 (경상대학교 사범대학 과학교육과) ;
  • 강대호 (경상대학교 사범대학 과학교육과) ;
  • 신갑철 (경상대학교 사범대학 과학교육과)
  • Published : 1981.10.30

Abstract

Induced circular dichroism spectra of racemic cobalt(III) complexes for $[Co(en)_3]^{3+},\;[Co(tn_)3]^{3+},\;cis-[Co(NH_3)(en)_2]^{3+},\;[Co({\beta}-ala)(en)2_]^{2+},\;[Co(gly)(en)_2]^{2+}\;and\;[Co(acac)(en)_2]^{2+}$ were measured when they were dissolved in aqueous d-tartrate2- solution at room temperature. Only a single negative CD spectrum was observed for all the complexes above in visible region(400∼500nm). It was interpreted that these CD bands were attributed to the difference in interaction between ${\Lambda}$-and ${\Delta}$-enantiomers with d-tartrate$^{2-}$. Namely, when d-tartrate$^{2-}$ was added to ${\Lambda}$-enantiomer and ${\Delta}$-enantiomer, it caused ${\Lambda}$-enantiomer to change greatly and ${\Delta}$-enantiomer to change only slightly; combined the results proved induced circular dichroism. The enantiomer for which the eluent has a stronger affinity should be eluted faster in ion-exchange column chromatography. It is possible to predict the elution order of chromatography from the sign of the induced CD if stronger interaction of chiral anion with the complex leads to greater change in the natural CD spectrum of the complex. The elution order was in complete agreement with the prediction from the sign of the induced CD spectrum for all the measured complexes.

Keywords

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