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Potentiometric and conductometric studies on some diphenyformazans and their metal chelates
Egyptian Journal of Chemistry. 1996; 39 (3): 223-34
em Inglês | IMEMR | ID: emr-107755
ABSTRACT
The ACID dissociation constant pKa values of 1-aryl-5 -[o- hydroxybenzene]-3-benzoylformazan derivatives in ethanol- water mixtures have been determined pH-metrically at 25 +/- 0.2 degree. Increase in the concentration of ethanol results in the increase of pK for all formazan derivatives. The formation constant log kMML values of some lanthanide complexes were determined in 70% [v/v] ethanol. The potentiometric and conductometric studies revealed that 1 1 and 1 2 [metal ligand] complexes were formed in solution. The correlation of the stability constants of complexes in relation to ionic radii, ionic potential and electronegativity of the lanthanides was discussed
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Índice: IMEMR (Mediterrâneo Oriental) Assunto principal: Quelantes / Condutometria / Formazans Idioma: Inglês Revista: Egypt. J. Chem. Ano de publicação: 1996

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Índice: IMEMR (Mediterrâneo Oriental) Assunto principal: Quelantes / Condutometria / Formazans Idioma: Inglês Revista: Egypt. J. Chem. Ano de publicação: 1996