Gold(I,III) chloride

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Notion

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Science and technology

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What Wikipedia says

Gold(I,III) chloride is the inorganic compound with the chemical formula Au4Cl8. It is a mixed valence compound as it contains gold in two oxidation states; square-planar gold(III) and almost linear gold(I). The compound, which is black, is photosensitive as well as air- and moisture-sensitive.

Excerpt from the Wikipedia article “Gold(I,III) chloride”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ben Mills, Public domain, via Wikimedia Commons.