Visible photoluminescence from nearly monodispersed Au12 clusters protected by meso-2,3-dimercaptosuccinic acid

The bis(p-sulfonatophenyl)phenylphosphine-assisted synthesis and phase transfer of ultrafine gold nanoclusters

“…Early in 1998, Wilcoxon et al reported for the first time the luminescence of Au clusters of sizes smaller than 2.5 nm, which were separated from an Au colloid using size-exclusion liquid chromatography [2]. Subsequently, a number of approaches have been developed for the syntheses of Au NCs protected by alkanethiol [3][4][5][6][7][8][9][10][11], poly(amidoamine) (PAMAM) [12][13][14][15], or proteins [16,17]. However, the direct synthesis of Au NCs in organic media was limited since the synthesis usually relies on the pH value of the media.…”

Fluorescence analysis of 6-mercaptopurine with the use of a nano-composite consisting of BSA-capped Au nano-clusters and core–shell Fe3O4–SiO2 nanoparticles

“…Many preparative methods for AuNCs are available and they involve various different capping molecules, e.g., proteins (Xie et al, 2009), amino acids (Negishi et al, 2005), DNA , dendrimers (Bao et al, 2007), mercapto-undecanoic acid (Negishi and Tsukuda, 2004), and lipoic acid (Shang et al, 2012).…”

Gold Nanomaterials Based Absorption and Fluorescence Detection of Mercury, Lead, and Copper

“…The manifesting long life time (hundred ns~μs) and large stoke shifts (> 170 nm) of alkane−thiolate Au NDs are attributed to electronic transitions of Au(I) coupling to the ligand-metal charge transfer transition (94)(95)(96). The interband transition (from d band electrons to the sp conduction band) and the relaxed radiative recombination across the energy gap between the highest and lowest occupied molecular orbitals (HOMO-LUMO gap) within the sp conduction band are responsible for fluorescence (97)(98)(99). As a result, the emission colors can be easily tuned by the selection of various thiol compounds.…”