Copper(II) Chromite

Copper chromite is an oxide of copper and chromium with a distinct greenish black color. it finds almost all of its use as a catalyst in organic chemistry for example in the decarboxylation of niacin or hydrogenation reactions.

Synthesis
Copper Chromite is formed by the decomposition of one of many chromium copper compounds. The most commonly used compound and may be the easiest to make is Copper Ammonium Chromate. This compound can be made by a reaction of copper(II) with ammonium dichromate or with an ammonium compound and a different dichromate salt. Decomposition of Copper Ammonium Chromate occurs at around 300 C so it is recommended one use a crucible or can instead of any glassware to prevent cracking due to high temperatures.