Chelation behaviour of some lanthanide [III], scandium [III], yttrium [III], thorium [IV] and uranium [VI] complexes with some hydroxy nitrosocoumarins
Egyptian Journal of Chemistry. 1997; 40 (4): 257-70
em Inglês
| IMEMR
| ID: emr-107819
ABSTRACT
The stability constants of the lanthanide ions [La, Ce, Pr, Nd, Sm, Gd, Dy, Er and Yb]; Sc, Y, Th and UO22+ ions with some hydroxy nitrosocoumarins were determined in 40% ethanol-water mixture at 25 degree and 0.1 ionic strength. It was found that the stability constants of the complexes increased with increasing ionic radii, from Y to Sm. The so called Gadolinium break was observed with heavier lanthanides. Sc and Th complexes possessed the highest stability constants. The potentiometric measurements and conductimetric titrations showed that 1 1 and 1 2 [M L] complexes were invariably formed
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Índice:
IMEMR (Mediterrâneo Oriental)
Assunto principal:
Escândio
/
Ítrio
/
Quelantes
/
Tório
/
Urânio
/
Hidróxidos
/
Metais Terras Raras
/
Compostos Nitrosos
Idioma:
Inglês
Revista:
Egypt. J. Chem.
Ano de publicação:
1997
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