Hexachlorodisilane (HCDS) ((SiCl3)2)

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Hexachlorodisilane (HCDS) ((SiCl3)2)

Hexachlorodisilane is the inorganic compound with the chemical formula Si2Cl6. It is a colourless liquid that fumes in moist air. It has specialty applications in as a reagent and as a volatile precursor to silicon metal. Hexachlorodisilane is stable under air or nitrogen at temperatures of at least up to 400°C for several hours but decomposes to dodecachloroneopentasilane and silicon tetrachloride in presence of Lewis bases even at room temperature. 4 Si2Cl6 → 3 SiCl4 + Si5Cl12 This conversion is useful in making silicon-based components of use in semiconducting devices including photovoltaic cells.The compound is also useful reagent for the deoxygenation reactions, such as this general process involving a phosphine oxide: 2 Si2Cl6 +OPR3 → OSi2Cl6 + PR3

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