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Complexes of N‐(2 Hydroxy‐1‐Naphthalidene) Antharanilic Acid with Some Lanthanides
Author(s) -
Abou Ali S. A.,
Ali G. Y.,
Osman M. M.
Publication year - 1984
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198400034
Subject(s) - chemistry , lanthanide , potentiometric titration , anthranilic acid , inorganic chemistry , ligand (biochemistry) , metal , ionic bonding , stability constants of complexes , metal ions in aqueous solution , ion , dissociation (chemistry) , ionic radius , acid dissociation constant , crystallography , aqueous solution , organic chemistry , biochemistry , receptor
The complexes of N ‐(2‐hydroxy‐1‐naphthalidene)anthranilic acid abbreviated (H 2 NA) with some trivalent rare earth elements (Pr, Nd, Sm, Gd, Dy, Er and Yb) were prepared. The complexes were characterized by chemical and thermal analysis, ir and conductimetric methods. Two types of ionic complexes; Ln(HNA) 2 OH·2H 2 O with Dy, Er and Yb, and Ln(HNA) 2 OH with Pr, Nd, Sm and Gd were isolated. Coordination of the ligand with metal‐ions occurs through the carboxy group and the nitrogen atom. The acid dissociation constants K 1 and K 2 of H 2 NA and the overall stability constants β 1 and β 2 of some lanthanide complexes in 75% (v/v) dioxan‐water solutions were determined by the potentiometric method.