A series of lipophilic ~5 nm gold nanoparticles (AuNPs) having a mixed organic layer consisting of 1-dodecanethiol and 1-(11-mercaptoundecyl) pyridinium bromide was synthesised by reacting in toluene tetraoctylammonium bromide-stabilised AuNPs with different mixtures of the two thiolate ligands. A bidentate omega-alkylthiolate calix[4]arene derivative was instead used as a functional protecting layer of ~3 nm silver nanoparticles (AgNPs). The functionalised nanoparticles (NPs) have been all characterised by transmission electron microscopy (TEM), and by UV-visible and X-ray photoelectron spectroscopy (XPS). Recognition of the pyridinium moieties loaded on the AuNPs by the calix[4]arene units immobilised on the AgNPs was demonstrated in solution of weakly polar solvents by UV-visible titrations and DLS measurements. The extent of the Au-AgNPs aggregation, evidenced through low-energy shift of their surface plasmon bands (SPB), was strongly dependent on the loading of the pyridinium moieties present in the organic layer of the AuNPs. Extensive aggregation between dodecanethiol-capped AuNPs and the Ag calix[4]arene-functionalised ones was also promoted by the action of a simple N-octyl pyridinium difunctional supramolecular linker. This linker can either interdigitate through its long fatty tail in the organic layer of the dodecanethiol-capped AuNPs, and simultaneously interact via its pyridinium moiety with the calix[4]arene units at the surface of the modified AgNPs

Calix[4]arene-Functionalised Silver Nanoparticles as Hosts for Pyridinium-Loaded Gold Nanoparticles as Guests / Vita, Francesco; Boccia, Alice; Marrani, Andrea G.; Zanoni, Robertino; Rossi, Francesca; Arduini, Arturo; Secchi, Andrea. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - 21:43(2015), pp. 15428-15438. [10.1002/chem.201501920]

Calix[4]arene-Functionalised Silver Nanoparticles as Hosts for Pyridinium-Loaded Gold Nanoparticles as Guests

VITA, Francesco
Investigation
;
ARDUINI, Arturo
Writing – Review & Editing
;
SECCHI, Andrea
Conceptualization
2015

Abstract

A series of lipophilic ~5 nm gold nanoparticles (AuNPs) having a mixed organic layer consisting of 1-dodecanethiol and 1-(11-mercaptoundecyl) pyridinium bromide was synthesised by reacting in toluene tetraoctylammonium bromide-stabilised AuNPs with different mixtures of the two thiolate ligands. A bidentate omega-alkylthiolate calix[4]arene derivative was instead used as a functional protecting layer of ~3 nm silver nanoparticles (AgNPs). The functionalised nanoparticles (NPs) have been all characterised by transmission electron microscopy (TEM), and by UV-visible and X-ray photoelectron spectroscopy (XPS). Recognition of the pyridinium moieties loaded on the AuNPs by the calix[4]arene units immobilised on the AgNPs was demonstrated in solution of weakly polar solvents by UV-visible titrations and DLS measurements. The extent of the Au-AgNPs aggregation, evidenced through low-energy shift of their surface plasmon bands (SPB), was strongly dependent on the loading of the pyridinium moieties present in the organic layer of the AuNPs. Extensive aggregation between dodecanethiol-capped AuNPs and the Ag calix[4]arene-functionalised ones was also promoted by the action of a simple N-octyl pyridinium difunctional supramolecular linker. This linker can either interdigitate through its long fatty tail in the organic layer of the dodecanethiol-capped AuNPs, and simultaneously interact via its pyridinium moiety with the calix[4]arene units at the surface of the modified AgNPs
Calix[4]arene-Functionalised Silver Nanoparticles as Hosts for Pyridinium-Loaded Gold Nanoparticles as Guests / Vita, Francesco; Boccia, Alice; Marrani, Andrea G.; Zanoni, Robertino; Rossi, Francesca; Arduini, Arturo; Secchi, Andrea. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - 21:43(2015), pp. 15428-15438. [10.1002/chem.201501920]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/2796486
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