Photoisomerisation and ligand-controlled reversible aggregation of azobenzene-functionalised gold nanoparticlesElectronic supplementary information (ESI) available: Syntheses details; details on experimental methods; NMR spectra; evaluation of AB surface concentrations by UV/Vis and NMR spectroscopy; aggregation at different AB surface coverages; and analysis of cis/trans-AB compositions in the photostationary states. See DOI: 10.1039/c4cc02250e

The photochemical behaviour of functionalised gold nanoparticles (AuNPs) carrying azobenzenethiolate-alkylthiolate monolayers was investigated. Repeated trans - cis and cis - trans isomerisation cycles could be performed in all cases with high efficiency. Reversible photoinduced aggregation was obse...

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Main Authors: Köhntopp, Anja, Dabrowski, Alexandra, Malicki, Michal, Temps, Friedrich
Format: Article
Language:English
Online Access:Get full text
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Summary:The photochemical behaviour of functionalised gold nanoparticles (AuNPs) carrying azobenzenethiolate-alkylthiolate monolayers was investigated. Repeated trans - cis and cis - trans isomerisation cycles could be performed in all cases with high efficiency. Reversible photoinduced aggregation was observed when azothiolates with long alkyl spacers (≥C 7 ) were combined with short (C 5 ) alkylthiolate coligands. The choice of a coligand thus offers control over the aggregation properties of the nanoparticles. Reversible photo-induced aggregation of azothiol-functionalised Au nanoparticles is controlled by the choice of an azothiol ligand and an alkylthiol coligand.
ISSN:1359-7345
1364-548X
DOI:10.1039/c4cc02250e