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Ionophoretic studies on mixed metal--nitrilotriacetate--penicillamine complexes.

B B Tewari1

  • 1Department of Chemistry, Faculty of Natural Sciences, University of Guyana, Georgetown. tewari@uog.eud.gy

Journal of Chromatography. A
|March 27, 2001
PubMed
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Paper ionophoresis effectively determined the stability of mixed ligand complexes. Researchers quantified aluminum and thorium complexes with nitrilotriacetate and penicillamine, yielding key stability constant values.

Area of Science:

  • Analytical Chemistry
  • Coordination Chemistry

Background:

  • Mixed ligand complex systems are crucial in various chemical and biological processes.
  • Understanding metal-ligand interactions requires accurate determination of stability constants.

Purpose of the Study:

  • To investigate the complexation equilibria of Al3+ and Th4+ with nitrilotriacetate and penicillamine using paper ionophoresis.
  • To determine the stability constants (log K) of the ternary complexes formed.

Main Methods:

  • Paper ionophoresis was employed to study metal ion movement in an electric field.
  • Complexants (nitrilotriacetate and penicillamine) were added to the background electrolyte at pH 8.5.
  • The concentration of nitrilotriacetate was constant, while penicillamine concentration was varied.

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Main Results:

  • The stability constants for Al3+-nitrilotriacetate-penicillamine complexes were determined to be 6.26 ± 0.09 (log K).
  • The stability constants for Th4+-nitrilotriacetate-penicillamine complexes were determined to be 6.68 ± 0.13 (log K).
  • Measurements were conducted at 35°C and an ionic strength of 0.1 M.

Conclusions:

  • Paper ionophoresis is a suitable technique for studying mixed ligand complex systems.
  • The study provides quantitative data on the stability of Al3+ and Th4+ ternary complexes.