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Stabilité des carboxylates de terres rares, IV N‐acétylglycinates
Author(s) -
Roulet R.,
Chenaux R.,
Vu Duc T.
Publication year - 1971
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19710540316
Subject(s) - chemistry , denticity , carboxylate , endothermic process , potentiometric titration , aqueous solution , ligand (biochemistry) , conjugate , lanthanide , inorganic chemistry , solvent , chelation , rare earth , stability constants of complexes , medicinal chemistry , stereochemistry , crystallography , ion , crystal structure , organic chemistry , mineralogy , mathematical analysis , biochemistry , receptor , mathematics , adsorption
The stability constants of N‐acetylgycinates of some rare earths in aqueous solution have been determined by a potentiometric method, and by a solvent extraction technique. The ligand forms 1:1 complexes which are stabilized by relatively large positive entropies of formation, the corresponding enthalpies being endothermic. This backs up the assumption that a conjugate base of an amino acid forms innersphere complexes and acts as a unidentate ligand towards a rare earth cation, like a simple carboxylate.