Abstract
The tendency of the 1: 1 rare earth-N- hydroxyethylethylenediaminetriacetic acid (Ln(HEDTA)) chelates to form mixed 1: 1: 1 chelates with glycine, ethylenediaminediacetic acid (EDDA), iminodiacetic acid (IMDA), and N-hydroxyethyliminodiacetic acid (HIMDA) was investigated. Mixed complex formation was found in all cases but formation constants could only be obtained for the IMDA, HIMDA, and some of the EDDA complexes. The mixed complexes were quite stable and the formation constants exhibited trends, which can reasonably be explained by the properties of the ligands and steric factors. Evidence for a coordination number larger than six in the rare earths is summarized and additional evidence is presented, which indicates that in the mixed chelates the rare earths have an expanded coordination number.
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