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Transition Metal Chemistry

, Volume 9, Issue 12, pp 473–476 | Cite as

Physico-chemical studies on the chelation behaviour of acenaphthenequinone monothiosemicarbazone (AQTS) with some bivalent metal ions

  • Shailendra K. Singh
  • Rakesh K. Sharma
  • Shrawan K. Sindhwani
Full Papers

Summary

The stability constants of the chelates formed from acenaphthenequinone monothiosemicarbazone and magnesium(II), manganese(II), cobalt(II), nickel(II), copper(II), zinc(II) or cadmium(II) have been determined pH-metrically in 75% v/v aqueous dioxan at various ionic strengths of NaClO4 and at different temperatures. The method of Bjerrum and Calvin(1, 2) as modified by Irving and Rossotti(3), has been used to determine the ñ and pL values. The stability constants were calculated on an IBM 360 FORTRAN-IV computer patterned after that of Sullivanet al.(4) to give βn values using a weighted least squares method. The Smin, values were also calculated. The thermodynamic stability constant has been determined by extrapolating the log K1vs √μ plot at zero ionic strength. The other thermodynamic functions have been calculated from the stability constants obtained for different temperatures at constant ionic strength. The bivalent metal stability sequence of AQTS chelates is in agreement with reported metal orders for other chelating reagents. The order of free energies and enthalpies of chelate formation for AQTS are: Mn2+<Co2+<Ni2+<Cu2+>Zn2+.

Keywords

Cadmium Ionic Strength Dioxan Stability Constant NaClO4 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. (1).
    M. Calvin and K. W. Wilson,J. Am. Chem. Soc., 67, 2003 (1945).Google Scholar
  2. (2).
    J. Bjerrum,Metal Amine Formation in Aqueous Solutions, 298 Hasse, Copenhagen, 1941.Google Scholar
  3. (3).
    H. M. Irving and H. S. Rossotti,J. Chem. Soc., 2904 (1954).Google Scholar
  4. (4).
    J. C. Sullivan, J. Rydberg and W. F. Miller,Acta Chem. Scand., 13, 2023 (1959).Google Scholar
  5. (5).
    A. I. Vogel,A Text Book of Practical Organic Chemistry, Longmans, New York, 1956, p. 177.Google Scholar
  6. (6).
    R Nasanen and A. Ekman,Acta Chem. Scand., 6, 1389 (1952).Google Scholar
  7. (7).
    D. P. Meiler, L. Maley,Nature, 159, 370 (1947);C. A., 161, 436 (1948).Google Scholar
  8. (8).
    H. Lrving and R. J. P. Williams,Nature, 162, 746 (1948).Google Scholar
  9. (9).
    H. M. Irving and R. J. P. Williams,Analyst, 77, 813 (1952).Google Scholar
  10. (10).
    K. S. Pitzer,J. Am. Chem. Soc., 59, 2365 (1937).Google Scholar
  11. (11).
    P. George and O. S. McClure,Progr. Inorg. Chem., 1, 428 (1959).Google Scholar

Copyright information

© Verlag Chemie GmbH 1984

Authors and Affiliations

  • Shailendra K. Singh
    • 1
  • Rakesh K. Sharma
    • 1
  • Shrawan K. Sindhwani
    • 1
  1. 1.Department of ChemistryUniversity of DelhiDelhiIndia

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