Gold chloride

This ion is very easily reduced to gold, and hence alkaline solutions of chloraurates(III) (often wrongly called gold chloride ) are used with a reducing agent to prepare colloidal gold. 

In biological materials, various nonspecific precipitants have been used in the gravimetric deterrnination of choline, including potassium triiodide, platinum chloride, gold chloride, and phosphotungstic acid (28). Choline may also be determined spectrophotometricaHy and by microbiological, enzymatic, and physiological assay methods. 

Pilocarpine dissolves in dilute soda solution, and the rotation is thereby reduced, due to the formation of the sodium salt of pilocarpic acid, CiiHigOgNa, of which pilocarpine is the lactone. Amorphous barium and copper salts have been prepared. Pilocarpine in dilute sulphuric acid gives with hydrogen peroxide, followed by potassium dichromate, a bluish-violet colour soluble in benzene. For the identification of the alkaloid Wagenaar recommends precipitation with gold chloride solution. 

Along the same lines it was advocated that colors be read at the absorption maximum rather than at some other convenient point. An example of this is the increase in absorbance one obtains when analyzing for bromide by means of gold chloride (18). As can be seen from Figure 14, the peak with gold bromide increases by a factor of more than 2 when the color is extracted into octanol and read at its absorption maximum (18). 

This figure gives a reference to the reader of the variety of shapes of nanoparticles produced by reactions of gold chloride with inactivated tissues, plant extracts, and live plants. 

Carbene complexes have also been prepared by transmetallation reactions. Lithiated azoles react with gold chloride compounds and after protonation or alkylation the corresponding dihydro-azol-ylidene compounds, e.g., (381) or (382), are obtained.22 9-2264 Silver salts of benz-imidazol have also been used to obtain carbene derivatives.2265 Mononuclear gold(I) carbene complexes also form when trimeric gold(I) imidazolyl reacts with ethyl chlorocarbonate or ethyl idodate.2266,2267 The treatment of gold halide complexes with 2-lithiated pyridine followed by protonation or alkylation also yields carbene complexes such as (383).2268 Some of these carbene complexes show luminescent properties.2269-2271... 

Reed Justin A, Andrew C, Halaas HJ, Paul P, Alex R, Thomas MJ, Grieser F (2003) The effects of microgravity on nanoparticle size distributions generated by the ultrasonic reduction of an aqueous gold-chloride solution. Ultrason Sonochem 10(4—5) 285-289... 

Test 1 Dilute 0.1 mL of the filtrate with 1 mL of water, and add one drop of gold chloride TS a violet blue color is produced at once. 

Thiols like pyridine-2-thiol yield (carbene)gold thiolates, and onium salts give cationic (carbene)gold ylide complexes, isolated and characterized as the perchlorates.170 The reaction of dithiocatechol with (cyclohexylisocya-nide)gold chloride affords a carbene complex [(CyNC)AuC(NHCy)2]+Cl-, which co-crystallizes with a neutral tetranuclear complex [(CyNCAu)2Au2(S2C6H4)2].224... 

Gold, chloride, adsorption, magnetite, goethite, alumina, titanium dioxide, hydrometallurgy... 

Hughes, H. C., Linge, H. G. (1989). Kinetics of gold chloride adsorption onto fresh activated coconut carbon. 

FIGURE 43-1 Motor endplates from rabbit intercostal muscle stained with Lowit s gold chloride method, a, terminal axonal arborization b, nucleus d, region where the myelin sheath ends n, neural branch. (From Ramon y Cajal, S. Textura del sistema nervioso del hombre y los vertebrados. Madrid N. Moya, 1899.)... 

Plattner An early process for extracting gold from auriferous pyrites by chlorination. The resulting gold chloride is extracted by water and reduced with ferrous sulfate ... 

This appears not to be one specific compound or mixture, but is of variable composition, depending on the method of preparation. Prepared from gold chloride and aqueous ammonia, the explosive precipitate is largely (C1AuNH2)2NH, but on washing with ammonia hydrolysis to the more explosive (HOAuNH2)2NH occurs, and the equilibrium is reversed by washing with chloride. 

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