Some Calorimetric Measurements in Metal Complex Reactions
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.
KeywordsStability Constant Chelate Ring Earth Alkali Metal Chelate Effect Acceptor Strength
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© Springer-Verlag Wien 1964