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Quinaldic Acid Complexes with Some Trivalent Rare Earth Metals
Author(s) -
Abou Ali S. A.,
Hindawey A. M.,
Mohamed G. B.
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.198400033
Subject(s) - chemistry , lanthanide , polarography , inorganic chemistry , thermogravimetric analysis , rare earth , electrolyte , ion , organic chemistry , mineralogy , electrode
The Polarographic behaviour of quinaldic acid in the presence of lanthanide cations (Kd 3+ , Gd 3+ , Er 3+ ) is studied at p H=4.5 and 0.1 M HClO 4 as supporting electrolyte. The polarographic reduction gives two waves at lower concentrations of quinaldic acid and three waves at higher concentrations. The nature of the waves was investigated. The dissociation constant of quinaldic acid as well as the stability constants of some lanthanide cation complexes with quinaldic acid were determined potentiometrically in 75% (v/v) dioxane‐water at 25° C and 0.1 M KNO 3 . The solid complexes of Nd, Gd and Er were isolated and studied by ir , differential thermal analysis (DTA) and thermogravimetric analysis (TGA) techniques.