Hydrogen tetrachloroaurate solution

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. 

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. 

A new method for the chemical deposition of carbon/gold composite nanotubes in alumina templates has been proposed recently (79). It is based on the impregnation of the template pores with diluted hydrogen tetrachloroaurate (HAuCy/acetone solutions and subsequent thermolysis. Gold(lll) is reduced, whereas the solvent acetone is oxidized. The results are nanotubes whose walls consist of gold nanocrystals supported by amorphous carbon. The authors report that when the template pores have a diameter smaller than 180 nm, single crystal gold nanowires are obtained. 

Synthesis of the metallic Au cores began with the treatment of all glassware with aqua regia (3 1 HChHNOs) followed by a thorough rinse with ultrapure water (18.2 M 2 cm ) from a Millipore academic system. A 1 mM aqueous solution of hydrogen tetrachloroaurate(III) (0.2 g in 0.5 L water) was placed in a roundbottom flask equipped with a reflux condenser. After the solution was brought to a boil, 39 mM sodium citrate dihydrate (1.15 g in 100 mL water) was added through the top of the condenser and the solution was allowed to boil for 10 minutes. 

Solution A = Hydrogen tetrachloroaurate = 0.3537g of HAUCI4 in 30mL of H2O Solution B = Tetraoctyl ammonium bromide = 2.187g in 80mL of toluene... 

In order to prevent S-alkylation in the repetitive acid-cleavage steps required in a multistep peptide synthesis, the protection of methionine residues as sulfoxides was proposed by Iselin.f This approach has since been widely used for peptide synthesis in solution and on solid supports.Generally, oxidation of L-methionine yields a mixture of S- and R-sulf-oxides and, depending on the conditions used, even a mixture of the related sulfone. Thereby, at least by oxidation with hydrogen peroxide the R-sulfoxide is formed in a preferred manner (80%), whereas oxidation of L-methionine by tetrachloroauric(III) acid has been reported to produce stereospecifically the 5-sulfoxide diastereoisomer. Isomeric pure Met(O) derivatives are obtained by isolation of the isomers from the 5,/ -sulfoxide mixture, taking advantage of the differences in solubility of the picrate salts.0 ... 

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