Article Detail

Home > Article Detail
  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

Development of Separation and Trace Analysis Methods for Platinum Group Elements-Separation and Retention Behavior of Platinoid Metal Acetylacetonates in Reversed-Phase Liquid Chromatography

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1993, v.6 no.1, pp.107-119
Lee, Dai Woon
Kim, Kyung Soo
Park, Young Hun
Czea, Myoung Zoon
Chung, Koo Soon
  • Downloaded
  • Viewed

Abstract

The purpose of this study is to investigated the elution behavior of platinoid metal acetylacetonates, which is the key to elucidate their retention mechanism and optimize their RPLC separation conditions. The retention data of four platinoid metal acetylacetonates have been measured on four different columns in methanol-water and acetonitrile-water systems. The retention of uncharged platinoid metal acetylacetonates is interpreted by solvophobic effect. The retention of platinoid metal acetylacetonates is also greatly influenced by the geometric structure of the complexes. The square planar chelates, <TEX>$Pd(acac)_2$</TEX>, <TEX>$Pt(acac)_2$</TEX>, are retained longer than the octahedral chelates, <TEX>$Rh(acac)_3$</TEX>, <TEX>$Ir(acac)_3$</TEX>. It is likely due to that square planar chelates show greater interaction with nonpolar stationary phase than octahedral chelates. The results of van't Hoff plots have shown that platinoid metal acetylacetonates is operated on the same retention mechanism in the temperature range of <TEX>$25{\sim}45^{\circ}C$</TEX>. The study of the retention mechanism by the enthalpy-entropy compensation phenomenon has indicated that the retention mechanism of octahedral chelates and square planar chelates do not vary with the composition change of methanol-water mobile phase, respectively. In acetonitrile-water mobile phase, however, the retention mechanism is observed to be more complicated. Optimum condition for the separation of four platinoid metal acetylacetonates is found to be 40% methanol, polymeric C18 column, and <TEX>$45^{\circ}C$</TEX>.

keywords
Platinoid Metal Acetylacetonates, Reversed-Phase Liquid Chromatography Retention Behavior


  • Downloaded
  • Viewed
  • 0KCI Citations
  • 0WOS Citations

Other articles from this issue

Recommanded Articles

상단으로 이동

Analytical Science and Technology