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Stability Constants of Rare Earths with Violuric Acids
Author(s) -
Singh B. P.,
Bhardwaj V. K.,
Singh B. R.,
Ghosh R.
Publication year - 1982
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.198200046
Subject(s) - chemistry , ligand (biochemistry) , metal , ionic strength , rare earth , medicinal chemistry , lanthanide , inorganic chemistry , nuclear chemistry , ion , aqueous solution , organic chemistry , biochemistry , mineralogy , receptor
The metal ligand stability constants of violuric acid [H 2 VA], N‐methyl violuric acid [H 2 MVA], N‐phenyl violuric acid [H 2 PVA] and N‐( o ‐ m ‐ p ) tolyl violuric acids [N‐H 2 ( o ‐ m ‐ p )TVA] with La(III), Ce(III), Pr(III), Nd(III), Sm(III), Eu(III), Gd(III), Dy(III), and Ho(III) have been determined potentiometrically in 50 Vol% ethanol water media at 25°C and at an ionic strength of 0.1 M NaClO 4 . The stability of the complexes follow the order of basicities of ligands and also the electron affinities of rare earths as measured by their overall ionisation potential. The order of stabilities of rare earths with violuric acids is, La 3+ < Ce 3+ < Pr 3+ < Nd 3+ < Sm 3+ < Gd 3+ < Eu 3+ < Dy 3+ < Ho 3+ .