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Stabilisation des complexes cuivre (i) polypyridyle vis-à-vis de l'oxydation aérobie par le zinc (ii) en association avec des anions acétate: une approche facile et son application à la détection de l'acide ascorbique en solution aqueuse.

Une nouvelle approche facile pour stabiliser les complexes de cuivre (i) en solution aqueuse par addition d'ions zinc (ii) en combinaison avec des ions acétate (OAc-) a été démontrée. Cette amélioration de la stabilité vis-à-vis de l'oxydation aérobie des espèces de cuivre (i) a été étudiée par diverses techniques, notamment la spectroscopie UV-vis, la RMN 1H, la spectrométrie FT-IR et la spectrométrie de masse ESI-MS. Nos résultats expérimentaux ainsi que les calculs DFT ont conduit à une structure proposée de [(adpa) Cu-OAc-Zn (OAc) (H2O) 2] + / 2+. Il a également été postulé que le zinc (ii) avec son acidité de Lewis peut attirer les électrons du centre du Cu par les ligands de pontage (OAc-), entraînant une réactivité plus faible de Cu (i) avec O2. En outre, cette stratégie s’est révélée applicable à la détection de l’acide ascorbique en surveillant l’évolution des états rédox des complexes de cuivre par spectroscopie de fluorescence. De plus, il a été démontré que la méthode était sensible et précise pour l'analyse quantitative de l'acide ascorbique dans les comprimés de vitamine C.


Source: https://www.ncbi.nlm.nih.gov/pubmed/30574972


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