Isolation of the Au₁₄₅(SR)₆₀X compound (R = n-butyl, n-pentyl; X = Br, Cl): novel gold nanoclusters that exhibit properties subtly distinct from the ubiquitous icosahedral Au₁₄₄(SR)₆₀ compound

Abstract

We report the identification and quantitative isolation of Au145(SR)60X (R = n-butyl, n-pentyl; X = halide) along with elucidation of key properties as compared to the corresponding ubiquitous chiral-icosahedral Au144(SR)60...

From Au11 to Au13: Tailored Synthesis of Superatomic Di-NHC/PPh3-Stabilized Molecular Gold Nanoclusters

“…Most studied AuNCs are stabilized by thiolate ligands and are characterized by “staples”, i.e., [Au­(I) n (SR) m ] motifs surrounding the cluster core and stabilizing it. − Such staples may impart exceptional stability to AuNCs, which have been synthesized and characterized in several forms, ranging from oligonuclear clusters with metalloid properties up to very high molecular mass metallic species involving hundreds of gold atoms. , However, the peculiar staples’ structures in thiolated AuNCs present drawbacks: for example, they complicate ligand substitution and interaction with external molecules, which are of fundamental importance for, e.g., catalytic processes . Furthermore, the electronic properties of the thiolate ligands cannot be very extensively varied, thus hampering the control over AuNC properties, such as the electronic structure of the cluster, its energy levels, and in ultimate analysis its photophysical behavior .…”

Electrospray Gold Standards of Molecular Mass 32- to 52-kDa: Charging Patterns of the Ubiquitous Virus-like Clusters, I - 197Au144-5(SR)60, R = 8 Variants, in Native [HPLC]-ESI-MS

“…. 14 The bottom four traces are aromatic thiolated benzyl [wine, (e)], 32 tertiary amine thiolated [black, (f)], 26 quaternary ammonium-PF6 [blue, (g)], 27 and tetra-ethylene glycol, ud-TEG-OH [gold, (h)]. 33 For LC traces of ud-TMA (g) and ud-TEG-OH (h) see…”

“…The instrument acquisition parameters of Maxis impact II (Q-TOF) are provided in our earlier work. 14 For the case of Benzyl/Au and cocktail sample analyses, a Bruker Maxis impact (separate instrument, earlier version of Maxis impact) was used, and the acquisition parameters are as follows:…”

“…The production of high-quality electrospray ionization mass spectra of monolayer protected clusters (MPCs) [5][6][7][8][9][10][11][12] a specific type of nanoparticle with core diameters less than approximately 3.0 nmhas generally been limited to hydrophobic [13][14][15][16][17] or to more moderately-sized aqueous varieties. Analysis of aqueous MPCs is a particularly challenging undertaking that requires high quality preparations, 18 significant purification and specific mass spectrometry procedures.…”

“…We have also demonstrated how the electrospray ionization mass spectrometry (ESI-MS) could be used as a unique source for precise identification and composition assignment of ligand-core stoichiometry for discrete metallurgy research. To prove that we have chosen the ubiquitous ~29 kDa (molecular mass) core Au clusters with versatile capping agents/ligands ranging from simplest alkanethiol (C2-C5), 7,14 tertiary amine (captamino), 26 benzyl 32 to more complicated 11-mercaptoundecyl-(tetra) ethylene glycol (ud-TEG-OH) 33 that has been extensively used in biomedical [34][35][36][37] and other mass spectrometry applications, [38][39][40] and 11-mercaptoundecyl)-N,N,N-trimethylammonium hexafluorophosphate (ud-TMA). 27 The charging patterns are interpreted within this model as characteristic of the R-group class.…”