Chromatographic separations of fac- and mer-tris(β-diketonato)chromium(III) complexes

Takashi Omori, Kazuyuki Hashimoto, Tsutomu Sekine, Kenji Yoshihara

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9 Citations (Scopus)


In order to find the factors that affect the separation of metal chelates, the elution and distribution behaviour of chromium(III) complexes coordinated with unsymmetrical β-diketones were studied in various solvents using silica gel as an adsorbent. The differences in the specific retention volumes or adsorption distribution coefficients of metal chelates are ascribed to the differences in the total energies of interaction between the chelate molecule and the adsorbent surface. The total energy S0 is expressed by three independent terms as follows: S0 aGi + bGj + c where Gi and Gj are parameters representing the interaction energies of the functional groups containing the substituents in a β-diketone. Using the relative values of Gi and Gj for the functional groups, the ratio of the distribution coefficients of Cr(acac)3 to a tris(β-diketonato)chromium(III) was evaluated. On the basis of a linear relationship between the experimental and calculated distribution coefficients, the quantitative separation of metal chelates in the silica gel adsorption chromatography is discussed.

Original languageEnglish
Pages (from-to)201-214
Number of pages14
JournalJournal of Chromatography A
Issue numberC
Publication statusPublished - 1984

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry


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