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Lanthanide‐Ion Complexation by D ‐Glucuronic and D ‐Galacturonic Acids
Author(s) -
Fuks Leon,
Bünzli JeanClaude G.
Publication year - 1993
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.19930760824
Subject(s) - chemistry , lanthanide , steric effects , chelation , aqueous solution , metal ions in aqueous solution , glucuronic acid , ligand (biochemistry) , stereochemistry , molecule , metal , ion , medicinal chemistry , inorganic chemistry , organic chemistry , biochemistry , receptor , polysaccharide
To assess the potential of naturally occurring substances in the treatment of heavy‐metal intoxication, the interaction between D ‐galacturonic and D ‐glucuronic acids with several trivalent lanthanide ions has been studied in aqueous solutions by means of a spectrophotometric method (27°; 0.1 M NaClO 4 ; pH 4.0). Values for the overall stability constants for [LnL] and [LnL 2 ] (Ln = La, Ce, Pr, Nd, Gd, or Lu) complexes are presented and discussed. The interpretation of the data shows that, similarly to acetates, the COOH group coordinates metal ions in both [LnL] and [LnL 2 ] complexes. The 1:1 complexation is supplemented by the ring C(5) O ‐atom. Moreover, the C(4) O ‐atom seems to play an important role in the steric hindrance of the chelating ligand molecules.