Gold monoiodide is the

inorganic compound An inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds⁠that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as ''inorganic chemistry''. Inorgan ...

gold Gold is a chemical element; it has chemical symbol Au (from Latin ) and atomic number 79. In its pure form, it is a brightness, bright, slightly orange-yellow, dense, soft, malleable, and ductile metal. Chemically, gold is a transition metal ...

and

iodine Iodine is a chemical element; it has symbol I and atomic number 53. The heaviest of the stable halogens, it exists at standard conditions as a semi-lustrous, non-metallic solid that melts to form a deep violet liquid at , and boils to a vi ...

with the formula AuI. It can be synthesized by dissolving gold powder in an aqueous solution of

and potassium iodide. With Lewis bases, AuI reacts to give numerous complexes.

Preparation

Gold monoiodide can be obtained by reacting a tetrachloridoauric acid solution with furthermore potassium iodide. It is also possible to produce it by reacting gold and iodine in a protective atmosphere at around 390 °C.

Properties

Gold monoiodide is a yellow, crystalline powder that gradually decomposes upon contact with water, humidity or light. It has a tetragonal crystal structure with the

space group In mathematics, physics and chemistry, a space group is the symmetry group of a repeating pattern in space, usually in three dimensions. The elements of a space group (its symmetry operations) are the rigid transformations of the pattern that ...

''P''4₂''/ncm'' (space group no. 138), a = 4.359 Å, c = 13.711 Å.

References

{{inorganic-compound-stub Gold(I) compounds Iodides Metal halides Gold–halogen compounds