Gold(I) sulfide

Digoldsulfid

Brown - black solid

Fixed

11.0 g · cm -3

Decomposition from 217 ° C

Insoluble in water

Attention

Template: Infobox chemical / molecular formula search available

Gold ( I) sulphide in a chemical compound of gold and sulfur. The black - brown solid is in addition to gold (III ) sulfide is one of the two known sulphides of gold.

In addition to the solid also a synthesis of nanoparticles is possible to have different optical and electronic properties as compared to the solid state.

Production and representation

Gold (I ) sulfide can be obtained from gold -cyanide solutions by means of hydrogen sulfide. These gold is first dissolved in a solution of potassium cyanide presence of oxygen. With hydrogen sulfide can then the sulfide precipitate from the solution.

Properties

Physical Properties

Gold ( I) sulphide crystallizing in the same crystal structure, such as silver sulfide, and copper ( I) oxide. The structure is cubic with a space group Pn3m and lattice parameter of a = 502 microns.

Between 25 and 100 ° C, gold (I ) sulphide, a semiconductor p-type with a band gap of 0.37 eV.

Chemical Properties

From 217 ° C to decompose the gold (I ) sulfide. This occurs at the air next to elemental gold sulfur dioxide.

In water, gold (I ) sulfide is insoluble, but it decomposes on contact with acids in gold and hydrogen sulfide.

Retinal diseases by gold sulfides

Poisoning with gold compounds are extremely rare; only when dealing with soluble gold salts such as potassium dicyanoaurate ( I) ( retinopathy ) are among workers in electroplating addition to allergic reactions caused by deposits of gold sulfides diseases of the retina (retina ) of the eye occurred.