Alkanethiolate-Protected Gold Clusters Generated from Sodium <i>S</i>-Dodecylthiosulfate (Bunte Salts)

Shon, Y.; Gross, Stephen M.; Dawson, B. M.; Porter, Marc D.; Murray, Royce W.

doi:10.1021/la000329y

Cited by 85 publications

(145 citation statements)

References 68 publications

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“…We therefore attempted to synthesize monolayer-protected cationic gold nanoparticles using the bis(triphenylphosphoniopropyl)diselenide (5a) and 6-(selenocyano)hexyl-triphenylphosphonium selenocyanates (3b) as the protecting ligands, assuming that Se-Se cleavage occurs in the interaction with gold. The synthesis of the gold nanoparticles was carried out following the same method as we reported in our previous work [4], via reduction of potassium tetrachloroaurate in a biphasic medium (dichloromethane:water) with an excess of sodium borohydride [22,23]. A solution of the ligand was prepared in dichloromethane (DCM) and solid potassium tetrachloroaurate (Se/Au molar ratio, 1:1) was then added to the solution.…”

Section: Resultsmentioning

confidence: 99%

The synthesis and characterisation of masked phosphonioalkyl selenoates: Potential ligands for the production of functionalised gold nanoparticles

Ju‐Nam

Allen

Gardiner

et al. 2007

Journal of Organometallic Chemistry

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Section: Resultsmentioning

confidence: 99%

The synthesis and characterisation of masked phosphonioalkyl selenoates: Potential ligands for the production of functionalised gold nanoparticles

Ju‐Nam

Allen

Gardiner

et al. 2007

Journal of Organometallic Chemistry

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“…The average SO3-MPC core diameter is slightly larger (2.2 nm; ∼Au 314 ) than that of tiopronin-MPCs (1.8 nm; ∼Au 201 ) 16a prepared at the same reactant:AuCl 4 -mole ratio but is considerably smaller than that of dodecylthiolate-MPCs derived from sodium S-dodecylthiosulfate. 31 Dodecylthiolate-MPCs derived from Bunte salts are also larger than those prepared from dodecanethiol. Such differences in average nanoparticle core sizes, with Bunte salts producing larger core dimensions, is probably due to the slower reaction of thiosulfates than thiols in passivating and halting growth of the cores, as we mentioned in the previous paper.…”

Section: Resultsmentioning

confidence: 99%

Water-Soluble, Sulfonic Acid-Functionalized, Monolayer-Protected Nanoparticles and an Ionically Conductive Molten Salt Containing Them

2001

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Sulfonic acid-functionalized monolayer-protected gold clusters (SO3-MPCs) have been synthesized by the reaction of the Bunte (thiosulfate) salt of 2-acrylamido-2-methyl-1-propanesulfonic acid (SO3) with tetrachloroaurate and borohydride in aqueous acetic acid. The nanoparticles produced have an average core diameter, obtained by transmission electron microscopy (TEM), of 2.2 ( 1.1 nm, and a 30 wt % ligand content, obtained by thermogravimetric analysis. These parameters, assuming an ideal closed-shell truncated octahedral nanoparticle, correspond to an average nanoparticle formula of Au314SO3111. Proton NMR, Fourier transform infrared (FTIR), and UV/vis spectroscopies are consistent with nanoparticle formation, and acid/base titrations are consistent with the strong acid character of the SO3-MPC monolayer. These nanoparticles add to a growing family of water-soluble MPCs. Synthesis of a salt of SO3-MPC with a polyether-tailed triethylammonium countercation yields an ionically conductive molten salt, which is studied by alternating current impedance spectroscopy in the solid state (neat melt) and solution form.Monolayer-protected gold clusters (MPCs) are becoming recognized for their diverse chemical and physical properties 1-5 and properties potentially relevant to nanoscale electronic devices, optic devices, magnetic materials, multifunctional catalysts, chemical recognition, and biosensors, 1,6-10 among others. Since Brust et al. 2a described the synthesis of isolable, stable, alkanethiolatepassivated gold nanoparticles, such nanoparticles have been functionalized by simple chemical transformations, 2-5,11-14 with a wide variety of structural units, including aromatic thiolates, 2b,11-13 ω-substituted alkanethiolates, 14a and polyhetero-ω-functionalized alkanethiolates. 14b These materials exhibit solubility in organic solvents of polarity correlated with that of the monolayers but lack water solubility, which is desirable for a variety of purposes including use in conjunction with biological systems. 15 Progress in designing water-soluble MPCs has been steady over the past several years and now includes MPCs with monolayers of tiopronin, 16a,b poly(ethylene glycol), 16c glutathione, 17 4-hydroxythiophenol, 2b,13b mercaptobenzoic acid, 11b and mercaptosuccinic acid. 18 Solubilities of 4-hydroxythiophenol, mercaptobenzoic acid, and mercaptosuccinic acid functionalized clusters are both limited and pH-dependent. Tiopronin [N-(2-mercaptopropionyl)glycine] and glutathione MPCs are freely water-soluble and the former additionally has been further functionalized by ligand place exchange and by amide coupling reactions of its carboxylic acid groups. 16b Small Au 55 clusters with strong acid ligands (Au 55 [PPh 2 C 6 H 4 SO 3 H]Cl 6 ) have been reported. 19 There has, however, been no well-characterized MPC reported with strong acid-functionalized thiolate ligand monolayers.In the field of molten salts known as polymer electrolytes, it is understood 20 that solid-state cation conductivity (1) (a) Schon, G.; Simon, U. C...

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“…The blue-shift of the surface plasmon occurs as particle size decreases. From the UV-vis absorption spectra in Figure 1, the peak appearing between 500 nm and 600 nm was caused by surface plasmons of Au NPs which can be stated and verified 28 by the adding of DI-water. The absorption peak appearing between 500 nm and 600 nm results from surface plasmons of Au NPs.…”

Section: Characterization Of Surface Plasmon Resonance Absorption Of mentioning

confidence: 72%

Surfactants-Aided Syntheses of Different Sizes and Triangular Shape of Gold Nanoparticles Using Trisodium Citrate in Environmentally Friendly and Photoinduced Methods

Su¹,

Wei²,

Chang³

et al. 2007

J. Nanosci. Nanotech.

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We prepared gold nanoparticles (Au NPs) by only using trisodium citrate as the stabilizer. The detailed reaction mechanisms of S(N)1 and E1 reactions are examined and evidenced in this study by FTIR data. Citric acid is a kind of tertiary substrate. In aqueous solution, the substitution nucleophile path 1 (S(N)1) reaction and Elimination path 1 (E1) reaction usually occur simultaneously. Chloride ions, the substitution nucleophile, play a very important role to launch the mechanisms of S(N)1 and E1 reactions. Controlling the concentration of the chloride ions with the addition of HCl(aq) according to Le Chatelier theory, the average particle size of Au NPs (5.5 nm) was achieved to overcome the minimum limited size (approximately 10 nm). Two stages of the photoinduced method, aggregation into triangular conglomerates and growth into triangular particles, were determined form TEM observations. This preparation of Au NPs has potential in tuning the size, shape, and mechanism of Au NP formation by using only environmentally friendly trisodium citrate and the photoinduced method.

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Alkanethiolate-Protected Gold Clusters Generated from Sodium S-Dodecylthiosulfate (Bunte Salts)

Cited by 85 publications

References 68 publications

The synthesis and characterisation of masked phosphonioalkyl selenoates: Potential ligands for the production of functionalised gold nanoparticles

The synthesis and characterisation of masked phosphonioalkyl selenoates: Potential ligands for the production of functionalised gold nanoparticles

Water-Soluble, Sulfonic Acid-Functionalized, Monolayer-Protected Nanoparticles and an Ionically Conductive Molten Salt Containing Them

Surfactants-Aided Syntheses of Different Sizes and Triangular Shape of Gold Nanoparticles Using Trisodium Citrate in Environmentally Friendly and Photoinduced Methods

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