Linear free energy relationships and the chemical speciation of amino-carboxylate ligand complexes
1997
Gangoda, Chula K. | Williams, David R.
Formation constants for H⁺, Ba²⁺, Sr²⁺, Mg²⁺, Ca²⁺, Mn²⁺, Fe²⁺, Cd²⁺, Co²⁺, Zn²⁺, Pb²⁺, Ni²⁺, La³⁺, Pr³⁺, Nd³⁺, Sm³⁺, Gd³⁺, Eu³⁺, Y³⁺, Tb³⁺, Dy³⁺, Ho³⁺, Er³⁺, Tm³⁺, Yb³⁺, and Lu³⁺ with N-methyliminodiacetate(MIDA²⁻), L-2-(Carboxymethyl)iminodiacetate (CIDA³⁻), Iminodisuccinate(IDSA⁴⁻), and N-carboxymethyliminodisuccinate (MAIDSA⁵⁻) complexes are reported either from laboratory determinations using pH potentiometry, or from a detailed literature survey, or from the use of such constants in linear free energy relationships to compute the unpublished constants. The ligands studied form a homologous series of general formula HN—(CH₂—C0₂⁻)ₙ shown as the four ligands in Figure 1 in which the number of electron donor sites varies from 3 to 6. Such constants are of use in the computer simulation of the chemical speciation of multi-metal, multi-ligand complex systems such as those encountered in detergent scenarios in the environment.
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