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Transition Metal Chemistry

, Volume 7, Issue 2, pp 75–79 | Cite as

Molybdenum(VI) complexation by amino-acids. Part 1 Species in aqueous solution of sodium molybdate and L-aspartate

  • Ana Maria V. S. V. Cavaleiro
  • Julio D. Pedrosa de Jesus
  • Victor M. S. Gil
  • Robert D. Gillard
  • Peter A. Williams
Full Papers

Summary

The complexation of molybdenum(VI) by L-aspartate in dilute aqueous solutions, at pH 6, was studied using u.v. spectrophotometry,1H and13C n.m.r. spectroscopy. A single complex anion, [MoO3(C4H5NO4)]2−, is observed in solution. The conformation of the aspartate ion in the complex was determined and shown to be consistent with it acting as a terdentate ligand. The formation constant of the complex was determined at different ionic strengths. Job's method has been employed, here and elsewhere, to study the stoichiometry of the complex. However, the result is strongly affected by polymerization of molybdenum(VI): this effect is discussed.

Keywords

Sodium Polymerization Spectroscopy Aqueous Solution Aspartate 
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Copyright information

© Verlag Chemie GmbH 1982

Authors and Affiliations

  • Ana Maria V. S. V. Cavaleiro
    • 1
  • Julio D. Pedrosa de Jesus
    • 1
  • Victor M. S. Gil
    • 1
  • Robert D. Gillard
    • 2
  • Peter A. Williams
    • 2
  1. 1.Department of ChemistryUniversity of AveiroAveiroPortugal
  2. 2.Department of ChemistryUniversity CollegeCardiffWales, UK

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