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Equilibrium studies on rare-earth chelates: Interactions of rare-earth ions with thioformohydroxamic acid

โœ Scribed by S. P. Mathur; C. S. Bhandari

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
285 KB
Volume
100
Category
Article
ISSN
0165-0513

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โœฆ Synopsis

Abstract

The complexation of rareโ€earth ions viz. La(III), Pr(III), Nd(III), Sm(III), Gd(III) and Y(III) with thioformohydroxamic acid has been investigated potentiometrically at 30 ยฑ 1ยฐC in a 70 per cent (v/v) dioxane/aqueous medium at 0.1 M ionic strength using the Bjerrumโ€Calvin titration technique. Stepwise and overall stability constants of all the complex species formed are reported. The values obtained by other methods such as Least Square, Block and McIntyre, Schroder and pointwise calculation are in reasonable agreement with the Bjerrumโ€Calvin halfโ€integral method. The stability order for 1:1 metalโ€ligand chelate is found to be

Sm > Nd > Gd > Pr > La > Y

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