Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Solvent Extraction of Eu3+ and Tb3+ Ions with 12-Crown-4 15-Crown-5 and 18-Crown-6

12-Crown-4, 15-Crown-5 및 18-Crown-6에 의한 Eu(Ⅲ) 및 Tb(Ⅲ)의 용매추출

  • Kim, Eun-Jeong (Department of Chemistry, Chungnam National University) ;
  • Yoon, Soo-Kyung (Department of Chemistry, Chungnam National University) ;
  • Bae, Jun-Hyun (Department of Environmental Engineering, Taeshin University) ;
  • Kang, Jun-Gil (Department of Chemistry, Chungnam National University) ;
  • Kim, Youn-Doo (Department of Chemistry, Chungnam National University)
  • 김은정 (충남대학교 자연과학대학 화학과) ;
  • 윤수경 (충남대학교 자연과학대학 화학과) ;
  • 배준현 (대신대학교 환경공학과) ;
  • 강준길 (충남대학교 자연과학대학 화학과) ;
  • 김연두 (충남대학교 자연과학대학 화학과)
  • Published : 19950400
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Abstract

The extractions of aqueous Eu3+ and Tb3+ ions into ethylacetate or dichloromethane were conducted by using 12-crown-4, 15-crown-5 and 18-crown-6 ethers as ligand. Benzoate ion was selected as counter anion for the complexes formed between the lanthanide ions and crown ethers. Fluorescence spectra of the lanthanide ions induced by the energy transfer from benzoate anion to the cations were also measured. The quantitative analysis of the lanthanide ions extracted into organic phase were made on the basis of the results of fluorescence. The measured extractivity is interpreted in terms of the ion-dipole interaction.

12-crown-4, 15-crown-5 및 18-crown-6 에테르들을 리간드로 사용하여 수용액에서 $Eu^{3+}$ 및 $Tb^{3+}$ 이온들을 ethylacetate 혹은 dichloromethane층으로 추출하였다. 이들간에 형성된 착물의 반대이온으로 benzoate 이온을 선택하였다. Benzoate 이온으로부터 란탄족 금속이온으로의 에너지 전달에 의하여 유도되는 형광스펙트럼을 역시 측정하였다. 이 결과를 바탕으로 유기용매층에 추출된 란탄족 금속이온들을 형광분석 방법으로 정량할 수 있었다. 측정된 추출율을 이온-쌍극자 상호작용 함으로써 논하였다.

Keywords

References

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