Germanium tetrabromide

Germanium tetrabromide is the inorganic compound with the formula GeBr4. It is a colorless solid that melts near room temperature. It can be formed by treating solid germanium with bromine, or by treating a germanium-copper mixture with bromine:
 * Ge + Br2 → GeBr4

From this reaction, GeBr4 has a heat of formation of 83.3 kcal/mol.

The compound is liquid at 25 °C, and forms an interlocking liquid structure. From room temperature down to −60 °C the structure takes on a cubic α form, whereas at lower temperatures it takes on a monoclinic β form.