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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 4
BKCSDE 26(4)
April 20, 2005 

 
Title
Synthesis and Solution Properties of La(III)-N-ethylmorpholine Complex
Author
Zeinab M. Anwar, Yong Kiel Sung*
Keywords
La(III) complex, Ethylmorpholine complex, N-Ethylmorpholine, Ligand, Chelate formation
Abstract
The complex of the composition LaL(NO3)3 (H2O)2 is prepared by the reaction of La(NO3)3·6H2O with Nethylmorpholine in aqueous medium. The ligand is involved in the complex as a neutral species where the chelation occurs via the oxygen of the ligand moiety and the nitrate groups as bidentate ligand. The chemical structure of the studied complex is confirmed through IR, XRD, and thermal analysis data. The complexation equilibria of La(III) with N-ethylmopholine is studied in aqueous medium at ionic strength I = 0.1 mol·dm?3 KNO3 and at 25, 35 and 45 oC, respectively. The thermodynamic parameters ?G, ?H and ?S values were calculated to prove the association with the complex formation. It is clearly observed that the process is accompanied by absorption of heat, i.e. endothermic process, while the entropy does not change greatly attributed to the release of constant number of water molecules during chelate formation.
Page
614 - 618
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