Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Separation of Lithium Isotopes by Tetraazamacrocycles Tethered to Merrifield Peptide Resin

  • Jeon, Youn-Seok (Department of Chemistry Education, Kongju National University) ;
  • Jang, Nak-Han (Department of Science Education, Kongju National University of Education) ;
  • Kang, Byung-Moo (Department of Chemistry Education, Kongju National University) ;
  • Jeon, Young-Shin (Korea Atomic Energy Research Institute) ;
  • Kim, Chang-Suk (School of Science Education, Chungbuk National University) ;
  • Choi, Ki-Young (Department of Chemistry Education, Kongju National University) ;
  • Ryu, Hai-Il (Department of Chemistry Education, Kongju National University)
  • Published : 2007.03.20
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Abstract

Tetraazamacrocyclic ion exchangers tethered to Merrifield peptide resin (DTDM, TTTM) were prepared and the ion exchange capacity of these was characterized. The isotope separation of lithium was determined using breakthrough method of column chromatography. The isotope separation coefficient was strongly dependent on the ligand structure by Glueckauf's theory. We found that the isotope separation coefficients were increased as the values of distribution coefficients were increased. In this experiment the lighter isotope, 6Li was enriched in the resin phase, while the heavier isotope, 7Li in the solution phase. The ion radius of lighter isotope, 6Li was shorter than the heavier isotope, 7Li. The hydration number of lithium ion with the same charge became small as mass number was decreased. Because 6Li was more strongly retained in the resin than 7Li, the isotopes of lithium were separated with subsequent enrichment in the resin phase.

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References

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