Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Stereoselective Electron-Transfer Reaction between Optical Active Cobalt(III) Complex and Racemic Cobalt(II) Complex

광학활성 코발트 (III) 착물과 라세미-코발트(II) 착물간의 입체선택적 전자전달반응

  • Dong-Jin Lee (Department of Industrial Chemistry, Kyungbuk Sanup University) ;
  • Maeng-Jun Jung (Department of Chemistry, College of Science, Yeungnam University) ;
  • Myung-Ki Doh (Department of Chemistry, College of Science, Yeungnam University)
  • 이동진 (경북산업대학 공업화학과) ;
  • 정맹준 (영남대학교 이과대학 화학과) ;
  • 도명기 (영남대학교 이과대학 화학과)
  • Published : 1991.10.20
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Abstract

The stereoselectivity on the electron-transfer reaction between optical active ${\bigwedge}$-[CO(EDDS)]- and conformationally restricted complex $[Co({\pm}chxn)_3]^{2+}$ has been examined in aqueous solution. The products are four conformational isomers $(lel_3,\;lel_2ob,\;lelob_2,\;and\;ob_3)$ of ${\bigwedge}$-[Co(chxn)$_3]^{3+}$ with optical purities of 22% e.e, 25% e.e, 11% e.e, and 10% e.e, respectively. The reaction between ${\bigwedge}$-[CO(EDDS)]- and $[Co({\pm}chxn)_3]^{2+}$ in DMSO produced lel3-${\Delta}$ and lel2ob-${\Delta}$-[Co(chxn)$_3]^{3+}$ whose optical purities are 100% e.e, and 75% e.e, respectively.

광학활성인 ${\bigwedge}$-[CO(EDDS)]$^-$와 리간드의 conformation 변화에 있어 제한되는 착물인 $[Co({\pm}chxn)_3]^{2+}$간의 전자전달반응에 따른 입체선택성을 수용액 중에서 조사한 결과 4개의 conformational isomer($lel_3,\;lel_2ob,\;lelob_2,\;and\;ob_3)$가 존재하는 ${\Delta}-[Co(chxn)_3]^{3+}$가 생성되었으며 각 이성질체의 광학순도는 각각 22% e.e, 25% e.e, 11% e.e, 10% e.e로서 나타났다. Λ-[CO(EDDS)]-와 [Co($\pm$ chxn)$_3]^{2+}$간의 전자전달반응에 따른 입체선택성을 DMSO 중에서 반응시킨 결과 두 개의 conformational isomer($lel_3, lel_2ob$)을 포함하는 ${\bigwedge}$-[Co(chxn)$_3]^{3+}$가 생성되었으며 광학순도는 $lel_3$의 경우가 100% e,e로 나타났으며, $lel_2ob$의 경우는 75% e.e로 나타났다.

Keywords

References

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