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Germanium dichloride

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Germanium dichloride

Germanium dichloride is a chemical compound of germanium and chlorine with the formula GeCl2. It is a yellow solid. Germanium dichloride is an example of a compound featuring germanium in the +2 oxidation state.

Solid germanium dichloride can be produced by comproportionation by passing germanium tetrachloride, GeCl4, over germanium metal at 300 °C and reduced pressure (0.1 mmHg).

Germanium dichloride is also formed from the decomposition of trichlorogermane, GeHCl3, at 70 °C. Trichlorogermane is generated when germanium reacts with hydrogen chloride. This reaction involves dehydrohalogenation.

Another route to germanium dichloride is the reduction of germanium tetrachloride with hydrogen at 800 °C.

GeCl2 is hydrolysed to give yellow germanium(II) hydroxide, which on warming gives brown germanium monoxide:

Alkalizing a solution containing germanium(II) ions:

Germanium oxides and hydroxides are amphoteric. Solutions of GeCl2 in HCl are strongly reducing. With chloride ion, ionic compounds containing the pyramidal GeCl3 ion have been characterised, for example With rubidium and caesium chloride compounds, e.g. RbGeCl3 are produced; these have distorted perovskite structures.

Germanium dichloride reacts with tetraethylammonium chloride to give the trichlorogermanate:

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