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
Unable to display preview. Download preview PDF.
© Springer-Verlag Wien 1964