Hydrogen tetrachloroaurate

Harada M, Asakura K, Toshima N (1993) Catalytic activity and structural analysis of polymer-protected gold/palladium bimetallic clusters prepared by the successive reduction of hydrogen tetrachloroaurate(ffl) and palladium dichloride. J Phys Chem 97 5103-5114... 

The polymer resulting from oxidation of 3,5-dimethyl aniline with palladium was also studied by transmission electron microscopy (Mallick et al. 2005). As it turned out, the polymer was formed in nanofibers. During oxidative polymerization, palladium ions were reduced and formed palladium metal. The generated metal was uniformly dispersed between the polymer nanofibers as nanoparticles of 2 mm size. So, Mallick et al. (2005) achieved a polymer- metal intimate composite material. This work should be juxtaposed to an observation by Newman and Blanchard (2006) that reaction between 4-aminophenol and hydrogen tetrachloroaurate leads to polyaniline (bearing hydroxyl groups) and metallic gold as nanoparticles. Such metal nanoparticles can well be of importance in the field of sensors, catalysis, and electronics with improved performance. 

Formula HAuCh MW 339.81 exists as tetrahydrate, HAuCh 4H20 MW 411.85 Synonyms chloroauric acid aurochlorohydric acid hydrochloroauric acid gold trichloride acid hydrogen tetrachloroaurate(lll). 

Caution. Hydrogen tetrachloroaurate(III) hydrate is corrosive plastic or Teflon implements should be used to handle this material. Gas evolution can be violent on addition of sodium borohydride, and the contents of the flask may... 

Hydrogen tetrachloroaurate(l —), H[AuCl4]nH20, or brown gold chloride, was obtained from Johnson Matthey this compound is quite hygroscopic, and may plate out gold on metal spatulas. Triphenylphosphine was obtained from BDH Chemicals. 

In order to obtain Au/Pt nanoparticle-covered BCN nanotube brushes, the nanotubes obtained by the template method described earlier were soaked in 2 mL of 5 mM aqueous solutions of hydrogen hexachloroplatinatc (rv) or hydrogen tetrachloroaurate (III) for 12 h. The nanotubes were washed with distilled water twice followed by a washing with 10 mM sodium borohydride solution before drying at 40 °C for an hour. The resulting products were examined by electron microscopy. 

Reactions of gold(III) [tetrachloroaurate(III)] ions To study these reactions use a 0-33m solution of commercial gold(III) chloride, which in fact is hydrogen tetrachloroaurate(III), H[AuC14]. 3HzO. 

Dissolve hydrogen tetrachloroaurate trihydrate (1.00 g, 2.54 mmol) and tetraoctylammonium bromide (1.60 g, 2.93 mmol) in a degassed water/toluene mixture (50 mL/65 mL). 

Hydrogen tetrachloroaurate(III) trihydrate (HAuC14-3H20, 99.9%) (Sigma-Aldrich, Spain). 

The formation of salts with melamine (1.3,5-triazine-2,4,6-triamine) is the most extensively studied reaction of this type. In most cases, melamine acts as a monoacidic base and forms salts with mineral acids, e.g. hydrochloric acid, nitric acid or sulfuric acid, inorganic complexes, e.g. hydrogen tetrachloroaurate(III) or dihydrogen hexachloroplatinate(IV) and a large variety of organic acids, e.g. acetic acid, oxalic acid, picric acid or some sulfonic acids.30... 

Palladium (II) acetate (Aldrich, 98%) and hydrogen tetrachloroaurate (ni) trUiydrate (Aldrich 99.9 -i- %) were used as metallic precursors. The... 

The quantity of stabilizing substance may be increased to provide greater protection from atmospheric oxidation. For example, with the use of 30 to 40 ml. of potassium thiocyanate or tellurate(IV) (or a mixture of the two) it is possible to obtain the hydroxide in a form which may be filtered in air and dried for 17 hours on the filter funnel without oxidation. The stabilized hydroxide will return to its original unstable form by treatment with oxidation-accelerating substances such as tetrachloroauric(III) acid [hydrogen tetrachloroaurate(III)], copper(II) sulfate, or palla-... 

Prepared by thermal decomposition of an auric chloride obtained from hydrogen tetrachloroaurate (III). 

Hydrogen tetrachloroaurate (HAuCLi, 99%), trisodium citrate dihydrated (Cit), ferric chloride (FeCl3), sodium hydroxide (NaOH, 98%), hydrochloric acid (HCl, a 37%),... 

Bimetallic Au/Pd nanoparticle synthesis reported by Wu etal. [401] involved mixing of microemulsion A (AOT/isooctane/aqueous solution of Pd(II)chloride and hydrogen tetrachloroaurate) and microemulsion B (AOT/isooctane/aqueous solution of hydrazine) to obtain within Ih particles of Pd, Au or Au/Pd(l 1) in the size range of -4.5-6, -3.5-4.5 and -2.5-3 nm respectively. 

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