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


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.


Sodium Polymerization Spectroscopy Aqueous Solution Aspartate 
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  1. (1).
    E. J. Hewitt inChemistry and Agriculture, The Chemical Society, London, London, 1979, p. 111.Google Scholar
  2. (2).
    W. G. Holkstra, J. W. Suttie, H. E. Ganther and W. Mertz (Eds.),Trace Element Metabolism in Animals, Vol. 2, Butterworths, London, 1974, pp. 612 and 621.Google Scholar
  3. (3).
    W. E. Newton and S. Otsuka (Eds.),Molybdenum Chemistry of Biological Significance, Plenum Press, New York, 1980.Google Scholar
  4. (4).
    P. C. H. Mitchell (Eds.),Proc. First Internat. Conf. Chem. and Uses of Molybdenum, Reading, 1973, p. 1.Google Scholar
  5. (5).
    W. L. Lindsay,Chemical Equilibra in Soil, John Wiley, New York, 1979, p. 365.Google Scholar
  6. (6).
    D. H. Brown and J. McPherson,J. Inorg. Nucl. Chem., 34, 1705 (1972).Google Scholar
  7. (7).
    M. K. Singh and M. N. Srivastava,J. Inorg. Nucl. Chem., 34, 2081 (1972).Google Scholar
  8. (8).
    M. Deodata Azevedo, R. Gomes Costa and M. Teresa Vilhena,Rev. Port. Quim., 15, 35 (1973).Google Scholar
  9. (9).
    D. L. Rabenstein, M. S. Greenberg and R. Saetre,Inorg. Chem., 16, 1241 (1977).Google Scholar
  10. (10).
    R. J. Butcher, H. Kipton, J. Powell, C. J. Wilkins and S. H. Young,J. Chem. Soc. Dalton Trans., 356 (1976).Google Scholar
  11. (11).
    A. M. V. Cavaleiro, J. D. Pedrosa de Jesus, V. M. S. Gil, R. D. Gillard, and P. A. Williams,Proc. 4th. Ann. Meet. Portuguese Chem. Soc., Lisbon, April 1981.Google Scholar
  12. (12).
    C. F. Baes and R. E. Mesmer,The Hydrolysis of Cations, Wiley, 1976.Google Scholar
  13. (13).
    H. McConnell and N. Davidson,J. Am. Chem. Soc., 72, 3164 (1950).Google Scholar
  14. (14).
    H. A. Benesi and J. H. Hildebrand,J. Am. Chem. Soc., 71, 2703 (1949).Google Scholar
  15. (15).
    M. Legrand and R. Viennet,Bull. Soc. Chim. Fr., 679 (1965); L. I. Katzin and E. Gulyas,J. Am. Chem. Soc., 90, 247 (1968).Google Scholar
  16. (16).
    Stability Constants, Supp. No. 1, Special Publication 25, Chem. Soc., London, 1971.Google Scholar

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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