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Germanium iodides
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<p>Germanium iodides are <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the formula GeIx. Two such compounds exist: germanium(II) iodide, GeI2, and germanium(IV) iodide GeI4. </p><p><a href="/facts/Germanium(II)_iodide/CILo3Iqf">Germanium(II) iodide</a> is an orange-yellow crystalline solid which decomposes on melting. Its <a href="/facts/Specific_density/ySquGd2x">specific density</a> is 5.37 and it can be <a href="/facts/Sublimation_(chemistry)/KDoKokMn">sublimed</a> at 240 °C in a <a href="/facts/Vacuum/BTk3goyV">vacuum</a>. It can be prepared by reducing germanium(IV) iodide with aqueous <a href="/facts/Hypophosphorous_acid/bmFX2Ga6">hypophosphorous acid</a> in the presence of <a href="/facts/Hydroiodic_acid/B5KQNSGA">hydroiodic acid</a>. It is oxidised by a solution of <a href="/facts/Potassium_iodide/6023uFnx">potassium iodide</a> in <a href="/facts/Hydrochloric_acid/HqItJlUT">hydrochloric acid</a> to germanium(IV) iodide. It reacts with <a href="/facts/Acetylene/yaDh6cmJ">acetylene</a> at 140 °C to form an analogue of <a href="/facts/Cyclohexa-1,4-diene/whu31FNg">cyclohexa-1,4-diene</a> in which the <a href="/facts/Methylene_group/sdGv7zMu">methylene groups</a>, CH2, are replaced with diiodogermylene groups, GeI2. </p><p><a href="/facts/Germanium(IV)_iodide/dHySWv8X">Germanium(IV) iodide</a> is an orange-red crystalline solid with <a href="/facts/Melting_point/MY0w0h0k">melting point</a> 144 °C and <a href="/facts/Boiling_point/E2BK9QoS">boiling point</a> 440 °C (with decomposition). Its <a href="/facts/Specific_density/ySquGd2x">specific density</a> is 4.32. It is soluble in non-polar solvents like carbon disulfide, chloroform or benzene, but hydrolyses readily. </p><p><a href="/facts/Mixed_anion_compound/oxSXtxTM">Mixed anion compound</a> <a href="/facts/Germanide_iodide/7zfTN5Qx">germanide iodides</a> are also known. </p>