Synthesis and Study of Quinalizarin Complexes with
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Date
1994-06
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Addis Ababa Universty
Abstract
The complexation of 1,2,5,8-tetrahydroxyanthraquinone
(quinalizarin) with some trivalent lanthanide ions: Sm(III),
Tb(III), Ce(III), and La(III) has been studied
spectrophotometrically and potentiometrically. The methods of
continuous variation and mole ratio indicate the metal to ligand
ratio is 1:1. The stability of the complexes were found to be in
the order Sm > Tb > Ce > La.
Solid lanthanide-quinalizarin complexes were also isolated.
The solid complexes are fine dark powders,insoluble in water and
common organic solvents. From elemental analysis, thermal
analysis and infrared spectra the complexes are characterized as
chelate polymers, with a formula of [Ln(Cu H,O.)XH201 n (X = 5 when
Ln = Sm, Ce and X = 6 when Ln = La, Tb). The relative thermal
stability of three of the complexes were determined from
differential thermal analysis, and are in the order: Sm > Ce~La.
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Keywords
La(III); Ce(III); Sm(III) and Tb(III)