Issue 4, 1998

Thermodynamic and kinetic studies of the aqueous complexation of gallium(III) and 5-fluoro-8-hydroxyquinoline by 19F NMR spectroscopy

Abstract

Measurement of the 19F NMR signal areas of the appropriate molar ratio of gallium(III) and 5-fluoro-8-hydroxyquinoline (fox) in aqueous solution as a function of pH (NaClO4, µ=0.1 M) at 25°C, gave, through predominant species diagrams, the thermodynamic constants of the Ga(fox), Ga(fox)2 and Ga(fox)3 species (log β110=12.6, log β120=24.05, log β130=34.3). Only the mer stereoisomer of Ga(fox)3 is formed. 19F–19F EXSY measurements on the same type of solutions gave indications on the kinetics of the same equilibria. Comparison of these thermodynamic and kinetic results with literature data for gallium(III) and iron(III) and non-fluorinated 8-hydroxyquinoline is made. Etudes thermodynamiques et cine′tiques de la complexation dans l'eau du gallium(III) et de la 5-fluoro-8-hydroxyquinole′ine par RMN du fluor-19. L'analyse des aires des signaux de re′sonance en RMN du fluor, de diffe′rents me′langes aqueux de GaIII et de la 5-fluoro-8-hydroxyquinole′ine (fox) en fonction du pH (NaClO4, µ=0.1 M) à 25°C, permet d'acce′der, grâce aux diagrammes de pre′dominance des espèces, aux constantes de complexation de Ga(fox), Ga(fox)2 et Ga(fox)3 (log β110=12.6; log β120=24.05; log β130=34.3). En solution aqueuse, seul l'isomère mer est pre′sent. Des expe′riences 2D de type 19F–19F EXSY sur ces me′langes fournissent des informations d'ordre cine′tique. Enfin, des comparaisons entre ces valeurs obtenues et celles donne′es dans la litte′rature pour les complexes du GaIII et du FeIII avec la 8-hydroxyquinole′ine (analogue non fluore′ de la fox) sont aborde′es.

Article information

Article type
Paper

New J. Chem., 1998,22, 361-366

Thermodynamic and kinetic studies of the aqueous complexation of gallium(III) and 5-fluoro-8-hydroxyquinoline by 19F NMR spectroscopy

O. Jarjayes, S. Hamman, F. Sarrazin, T. Benaïssa and C. G. Be′guin, New J. Chem., 1998, 22, 361 DOI: 10.1039/A800403J

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