a b s t r a c tScanning electrochemical microscopy (SECM) was used to monitor in situ hydrogen peroxide (H 2 O 2 ) produced at a polarized water/1,2-dichloroethane (DCE) interface. The water/DCE interface was formed between a DCE droplet containing decamethylferrocene (DMFc) supported on a solid electrode and an acidic aqueous solution. H 2 O 2 was generated by reducing oxygen with DMFc at the water/DCE interface, and was detected with a SECM tip positioned in the vicinity of the interface using a substrate generation/ tip collection mode. This work shows unambiguously how the H 2 O 2 generation depends on the polarization of the liquid/liquid interface, and how proton-coupled electron transfer reactions can be controlled at liquid/liquid interfaces.
Die Erzeugung von Wasserstoffperoxid an einer Flüssig‐flüssig‐Grenzfläche verläuft mit einer Ausbeute von 20 % bezogen auf die Konzentration des Reduktionsmittels Decamethylferrocen (gelbe Struktur; siehe Bild). Zur Umwandlung von O2 in H2O2 führt die Flüssig‐flüssig‐Grenzfläche Elektronen aus dem Reduktionsmittel und Protonen aus der wässrigen Phase zu. Das H2O2 wird im Verlauf der Reaktion in die wässrige Phase extrahiert. DCE = 1,2‐Dichlorethan.
We demonstrate that the coupling system of negatively capped CdSe/ZnS QDs with an oxidized Cytochrome c (Cyt c) is capable of the fluorescent imaging of a superoxide radical (O(2)˙⁻) with high sensitivity and specificity in living cells, without interference from other Reactive Oxygen Species (ROS) or relevant intracellular components.
Oxygen I 0011H2O2 Generation by Decamethylferrocene at a Liquid/Liquid Interface. -O 2 is reduced to H 2 O 2 by decamethylferrocene in 1,2-dichloroethane in contact with an aqueous solution of sulfuric acid with a yield of 20% with respect to decamethylferrocene. The reduction occurs in the absence of any noble metal catalysts at the polarized water/1,2-dichloroethane interface. The rate of reaction is controlled by the Galvani potential difference across the interface, which is determined chemically using various salts with a common ion. -(SU, B.; NIA, R. P.; LI, F.; HOJEIJ, M.; PRUDENT, M.; CORMINBOEUF, C.; SAMEC, Z.; GIRAULT*, H. H.; Angew. Chem., Int. Ed. 47 (2008) 25, 4675-4678; Inst. Phys. Appl., Ec. Polytech. Fed. Lausanne, CH-1015 Lausanne, Switz.; Eng.) -W. Pewestorf 36-016
a b s t r a c tFrom the thermodynamic data obtained by ion-transfer voltammetry, we derive here the ionic partition diagram of 5,10,15,20-tetraphenyl-21H,23H-porphine (H 2 TPP) at the water|1,2-dichloroethane interface using a simple Born solvation model. This zone diagram shows under which form this porphyrin is present, i.e. neutral, monoprotonated or diprotonated, and in which phase i.e. either in the aqueous or the organic phase as a function of the aqueous pH and the interface polarisation that can be controlled externally or by the distribution of supporting electrolytes. This diagram explains why the monoprotonated form has been difficult to observe when doing biphasic pH titrations.
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