Photochemical Norrish type I reaction as a tool for metal nanoparticle synthesis: importance of proton coupled electron transfer

Abstract

The Norrish type I photocleavage is an excellent source of strongly reducing free radicals that can be used to convert soluble metal ions into their atomic state that proceed to form nanoparticles. Proton coupled electron transfer (PCeT) is a useful tool to interpret the mechanism for metal ion reduction, a process that in these systems involves multisite PCeT, with proton and electron having separate receiving substrates.

Aspartame-Stabilized Gold–Silver Bimetallic Biocompatible Nanostructures with Plasmonic Photothermal Properties, Antibacterial Activity, and Long-Term Stability

“…The presence of HEBA in these materials is well established. 11,17 In addition, the antimicrobial properties of the particles synthesized In the presence of AuNP@Ag@Asm the MIC value is lower for irradiated experiments than non-irradiated experiments. Therefore, the amount of AuNP@Ag@Asm needed to inhibit bacterial growth is lower under light exposure.…”

One-pot blue-light triggered tough interpenetrating polymeric network (IPN) using CuAAC and methacrylate reactions

“…Moreover, as the CuAAC network is formed, the unreacted methacrylate monomer act as a diluent imparting higher mobility and thus, an increased final conversion of CuAAC polymerization. The prolonged inhibitory period of the methacrylate in the IPN composition owes to the presence of copper cations which quench the excited triplet state of photoinitiator used here 27, 34, 35 (Fig. S2 in SI showing the inhibitory effect of copper on the methacrylate polymerization in absence of the CuAAC monomers).…”

Controlled Light‐Mediated Preparation of Gold Nanoparticles by a Norrish Type I Reaction of Photoactive Polymers

“…[20] Thep reparation of AuNPs within ap olymer matrix using ap hotochemical approach would therefore be av aluable strategy.I deally,t he reaction setup should be simple and the light-mediated process may facilitate control of the rate of nanoparticle formation. [21] In 2006, Scaiano and co-workers reported the synthesis of AuNPs by using the Norrish type Ip hotochemical reactions for the in situ generation of reducing radicals (Scheme 1a). [21] In 2006, Scaiano and co-workers reported the synthesis of AuNPs by using the Norrish type Ip hotochemical reactions for the in situ generation of reducing radicals (Scheme 1a).…”

“…[21] In 2006, Scaiano and co-workers reported the synthesis of AuNPs by using the Norrish type Ip hotochemical reactions for the in situ generation of reducing radicals (Scheme 1a). [21,22] It was shown by mass spectrometry that the concomitantly generated benzoyl radical 2 is oxidized by O 2 to the corresponding benzoic acid, which then contributes to the stability of the formed AuNPs. [21,22] It was shown by mass spectrometry that the concomitantly generated benzoyl radical 2 is oxidized by O 2 to the corresponding benzoic acid, which then contributes to the stability of the formed AuNPs.…”