Photoreduction of silver salts in the presence of three polyaminocyclodextrin derivatives (AmCD, Figure 1) constitutes a simple and straightforward route to obtain stable Ag nanoparticles. These systems have been suitably characterized (UV-vis, FT-IR, TEM, Figure 2) and tested for their antimicrobial activity.1 We observed that Ag photoreduction is effectively induced by irradiation with green light (513 nm); however, best performances are achieved with the use of a light source having at the same time a significant emission in the near-infrared (NIR) region. On the grounds of analytical and kinetic evidences, we hypothesized a multi-step mechanism for nanoparticle formation. In particular, green irradiation induces an electron-transfer process producing small Ag0 seeds, while the capping agent functions as sacrificial reductant, affording different species (radicals, iminium ions aldehydes). These, in turn, function as reducing agents in a secondary step stimulated by NIR irradiation, from which the final nanocomposite is ultimately obtained.

Lo Meo, P., Russo, M., Chillura Martino, D., Noto, R. (2016). Photochemical preparation of polyaminocyclodextrin-capped silver nanocomposites: mechanistic insights. In XXXVII Convegno Nazionale della Divisione di Chimica Organica. Atti del Convegno.

Photochemical preparation of polyaminocyclodextrin-capped silver nanocomposites: mechanistic insights

LO MEO, Paolo Maria Giuseppe;Russo, Marco;CHILLURA MARTINO, Delia Francesca;NOTO, Renato
2016-01-01

Abstract

Photoreduction of silver salts in the presence of three polyaminocyclodextrin derivatives (AmCD, Figure 1) constitutes a simple and straightforward route to obtain stable Ag nanoparticles. These systems have been suitably characterized (UV-vis, FT-IR, TEM, Figure 2) and tested for their antimicrobial activity.1 We observed that Ag photoreduction is effectively induced by irradiation with green light (513 nm); however, best performances are achieved with the use of a light source having at the same time a significant emission in the near-infrared (NIR) region. On the grounds of analytical and kinetic evidences, we hypothesized a multi-step mechanism for nanoparticle formation. In particular, green irradiation induces an electron-transfer process producing small Ag0 seeds, while the capping agent functions as sacrificial reductant, affording different species (radicals, iminium ions aldehydes). These, in turn, function as reducing agents in a secondary step stimulated by NIR irradiation, from which the final nanocomposite is ultimately obtained.
Settore CHIM/02 - Chimica Fisica
Convegno Nazionale della Divisione di Chimica Organica della Società Chimica Italiana
Mestre
18-22 settembre 2016
37
2016
00
A stampa
Lo Meo, P., Russo, M., Chillura Martino, D., Noto, R. (2016). Photochemical preparation of polyaminocyclodextrin-capped silver nanocomposites: mechanistic insights. In XXXVII Convegno Nazionale della Divisione di Chimica Organica. Atti del Convegno.
Proceedings (atti dei congressi)
Lo Meo, P.; Russo, M.; Chillura Martino, D.; Noto, R.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/202050
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