Reversible Electrochemical Modulation of a Catalytic Nanosystem. Issue 36 (29th July 2016)

• Record Type: Journal Article
• Authors: della Sala, Flavio; Chen, Jack L.‐Y.; Ranallo, Simona; Badocco, Denis; Pastore, Paolo; Ricci, Francesco; Prins, Leonard J.
• Is Part Of: Angewandte Chemie international edition. Volume 55:Issue 36(2016)
• Page Start: 10737
• Page End: 10740
• Publication Date: 2016-07-29
• Subjects: gold nanoparticles -- nanocatalysis -- nanozymes -- supramolecular catalysis -- supramolecular chemistry; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201605309
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: A catalytic system based on monolayer‐functionalized gold nanoparticles (Au NPs) that can be electrochemically modulated and reversibly activated is reported. The catalytic activity relies on the presence of metal ions (Cd 2+ and Cu 2+ ), which can be complexed by the nanoparticle‐bound monolayer. This activates the system towards the catalytic cleavage of 2‐hydroxypropyl‐ p ‐nitrophenyl phosphate (HPNPP), which can be monitored by UV/Vis spectroscopy. It is shown that Cu 2+ metal ions can be delivered to the system by applying an oxidative potential to an electrode on which Cu 0 was deposited. By exploiting the different affinity of Cd 2+ and Cu 2+ ions for the monolayer, it was also possible to upregulate the catalytic activity after releasing Cu 2+ from an electrode into a solution containing Cd 2+ . Finally, it is shown that the activity of this supramolecular nanosystem can be reversibly switched on or off by oxidizing/reducing Cu/Cu 2+ ions under controlled conditions. Abstract : Hop on, hop off : Metal ions are reversibly released from an electrode to regulate the activity of a gold nanoparticle catalyst (see picture). The system catalyzes the cleavage of 2‐hydroxypropyl‐ p ‐nitrophenyl phosphate and the formation of p ‐nitrophenolate can be monitored by UV/Vis spectroscopy.