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. Le-choix-de-la-nature-de-z-+-repose-sur-plusieurs-critères-assez-exigeants, En effet, les ABP étant très versatiles, la modification d'un paramètre au cours de leur synthèse peut avoir d'importants effets sur leurs propriétés finales. Ainsi, le cation Z + choisi : -ne doit pas être un cation alcalin

K. La-métathèse-de, Fe(CN) 6 ] nécessite la séparation des cations potassium et des anions [Fe(CN) 6 ] 3-, ainsi que l'introduction des cations (Bu 4 N) + . La séparation du système ionique (3 K + ; [Fe(CN) 6 ] 3-) est réalisée par une séparation de phases : une espèce est conservée en solution tandis que la seconde est précipitée à l'aide d'un contre-ion. La métathèse en une seule étape de K 3 [Fe(CN) 6 ] en (Bu 4 N) 3 [Fe(CN) 6 ] nécessiterait donc l'introduction dans le milieu réactionnel d'un sel de (Bu 4 N)Q, avec Q un anion permettant la précipitation de KQ. Malheureusement, les sels de potassium présentent des produits de solubilité très élevés en milieu aqueux

A. Le-sel-de, Fe(CN) 6 ] a été retenu, celui-ci présentant un faible produit de solubilité en phase aqueuse. De plus, les cations argent Ag + peuvent former des sels présentant des produits de solubilité en phase

. Le-solide-orange-de-ag, Fe(CN) 6 ] formé précipite immédiatement Ce solide est récupéré par centrifugation du milieu réactionnel. Le solide de Ag 3 [Fe(CN) 6 ] est ensuite lavé plusieurs fois à l

. Le-solide-orange-de-ag, Fe(CN) 6 ] disparaît rapidement lors de la formation du solide gris de AgBr. Le milieu réactionnel est centrifugé et le surnageant jaune de (3 (Bu 4 N) + ; [Fe(CN) 6 ] 3-) est récupéré. La concentration de la solution d'hexacyanoferrate(III)

L. Protocole and K. 'étape-de-métathèse-de, Le protocole de synthèse est le suivant : -Précipitation de Ag 3 [Fe(CN) 6 ] : 25 g de nitrate d'argent AgNO 3 (0,15 mol) dans 100 mL d'eau distillée sont additionnés par goutte à goutte lent à 33 g d'hexacyanoferrate(III) de potassium K 3 [Fe(CN) 6 ] (0,10 mol) dans 200 mL d'eau distillée, sous agitation magnétique

. Cette-métathèse, Bu 4 N) 3 [Fe(CN) 6 ] en solution aqueuse. L'objectif de cette synthèse étant avant tout l'obtention d'une solution de

+. Ag and K. , le rendement de synthèse n'est pas déterminé ici. La concentration de la solution de, Fe(CN), vol.3, issue.6

U. Le-spectre, ] 3-présente une bande caractéristique centrée sur 419 nm (Figure A37) Cette bande a été utilisée pour déterminer la concentration des solutions de (Bu 4 N) 3 [Fe(CN) 6 ] par application de la loi de Beer-Lambert. Les mesures UV-visible ont été effectuées au moyen d'un spectromètre UV-visible de marque Varian (modèle Cary 5000) disponible au LCI. Une échelle de concentration de solutions de K 3 [Fe(CN) 6 ] a été utilisée afin de vérifier le domaine de validité de la loi de Beer-Lambert et d'étalonner celle-ci (Figure A38) La concentration des solutions obtenues lors de l

A. Figure and U. Spectre, ion [Fe(CN) 6 ] 3-enregistré pour une solution de K 3 [Fe(CN) 6 ] (trait plein) et pour une solution de (Bu 4 N) 3 [Fe(CN) 6 ] (trait pointillé) La ligne verticale indique l'absorption maximale de la solution

A. ?. Figure, Absorbance d'une solution de K 3 [Fe(CN) 6 ] en fonction de sa concentration à ? = 419 nm

A. A. Synthèse-des, C. La-synthèse-des, and A. A. Cofe, CoFe ? s'effectue par addition lente d'une solution aqueuse de nitrate de cobalt(II) Co(NO 3 ) 2 sur une solution aqueuse d'hexacyanoferrate(III) de tétrabutylammonium (Bu 4 N) 3 [Fe(CN) 6 ], éventuellement en présence d'une quantité variable d'un sel de nitrate d'alcalin(I) ANO 3