Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Electronic Transitions and Ligand Field Analysis of mer-[N-(2-aminoethyl)-1,2-ethanediamine](glycylglycinato) chromium (III) Perchlorate

mer-[Cr(dien)(glygly)]$CIO_4$ 의 전자전이와 리간드장 해석

  • Choi, Jong Ha (Department of Applied Chemistry, Andong National University) ;
  • Hong, Yong Pyo (Department of Applied Chemistry, Andong National University) ;
  • Park, Yu Chul (Department of Chemistry, Kyungpook National University)
  • 최종하 (안동대학교 자연과학대학 응용화학과) ;
  • 홍용표 (안동대학교 자연과학대학 응용화학과) ;
  • 박유철 (경북대학교 자연과학대학 화학과)
  • Published : 20011000
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Abstract

The emission and excitation spectra of mer-[Cr(dien)(glygly)]ClO$_4$(glygly=glycylglycinate;dien=N-(2-aminoethyl)-1,2-ethanediamine) taken at 77 K are reported. The infrared and visible spectra at 298 K are also measured. The twelve electronic bands due to spin-allowed and spin-forbidden transitions are assigned. Using the observed transitions, a ligand field analysis has been performed to determine the bonding property of coordinated atoms in the chromium(III) complex. It is confirmed that the amine nitrogen atoms of the dien and glygly have strong $\sigma$-donor characters, but the peptide nitrogen of glygly has weak $\pi$-donor property toward chromium(III) ion.

77K에서 mer-[Cr(dien)(glygly)]$ClO_4$의 방출 및 들뜬 상태 스펙트럼과 실온에서 적외선 및 가시선 스펙트럼을 측정하였다. 스핀-허용 및 스핀-금지에 해당하는 12개의 전자 전이의 성분을 배정하였다. 관측한 전이를 이용하여 Cr(Ⅲ) 착물에 배위된 원자의 결합성을 결정하기 위해서 리간드장 해석을 수행하였다. 이 연구에서 dien과 glygly 리간드의 아민 N 원자는 강한 $\sigma$-주개 특성을 갖는 반면에, glygly의 펩티드 N 원자는 Cr(Ⅲ) 이온에 약한 $\pi$-주개의 성질이 있음을 확인할 수 있었다.

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References

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