Germanium iodides
Germanium iodides are inorganic compound with the formula GeIx. Two such compounds exist: germanium iodide,, and germanium iodide.
Germanium(II) iodide is an orange-yellow crystalline solid which decomposes on melting. Its specific density is 5.37 and it can be sublimed at 240 °C in a vacuum. It can be prepared by reducing germanium iodide with aqueous hypophosphorous acid in the presence of hydroiodic acid. It is oxidised by a solution of potassium iodide in hydrochloric acid to germanium iodide. It reacts with acetylene at 140 °C to form an analogue of cyclohexa-1,4-diene in which the methylene groups,, are replaced with diiodogermylene groups,.
Germanium(IV) iodide is an orange-red crystalline solid with melting point 144 °C and boiling point 440 °C. Its specific density is 4.32. It is soluble in non-polar solvents like carbon disulfide, chloroform or benzene, but hydrolyses readily.
Mixed anion compound germanide iodides are also known.