Abstract
Previous equilibrium studies (1) in aqueous solution of the reaction between Ca2+ or Cd2+ and the EDTA homologues:
(n = 2 für EDTA; n= 3 für TMTA; n= 4 für TETA; n= 6 für HDTA; and n = 8 für ODTA, generally abbreviated L) have revealed that increase of the number n of methylene groups causes the stability constant of the 1:1 complex ML to drop off rapidly, especially in the range n = 2 to n = 4. As generally expected, complexes with 5-membered rings were found to be much more stable (2) than those containing 6- or 7-membered rings. The measurements have now been extended to many other divalent metals, and to lanthanum.
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References
SCHWARZENBACH, G., SENN, H., and ANDEREGG, G., Helv.Chim. Acta., 40, 1886 (1957).
SCHWARZENBACH, G., Helv. Chim. Acta, 35, 2344 (1952).
Unpublished measurements of ANDEREGG, G., and L’EPLATTENIER, F.
ANDEREGG, G., Helv. Chim. Acta, 46, 1833 (1963).
COBBLE, J. W., J. chem. Phys., 21, 1451 (1953).
Stability constants, Special Publication No. 7, The Chemical Society, London, 1958.
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© 1964 Springer-Verlag Wien
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Anderegg, G. (1964). Some Calorimetric Measurements in Metal Complex Reactions. In: Gutmann, V. (eds) Proceedings of the 8th International Conference on Coordination Chemistry. Springer, Vienna. https://doi.org/10.1007/978-3-7091-3650-8_11
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DOI: https://doi.org/10.1007/978-3-7091-3650-8_11
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