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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.

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