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・ Osmund (bishop of London)
・ Osmund (bishop of Salisbury)
・ Osmund Airy
・ Osmund Andersen Lømsland
・ Osmund Bopearachchi
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・ Osmium borides
・ Osmium dioxide
・ Osmium hexafluoride
・ Osmium oxide
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Osmium(IV) chloride
・ Osmo
・ Osmo Antero Wiio
・ Osmo Buller
・ Osmo Harkimo
・ Osmo Hänninen
・ Osmo Jussila
・ Osmo Kaila
・ Osmo Kontula
・ Osmo Lindeman
・ Osmo Pekonen
・ Osmo Puhakka
・ Osmo Soininvaara
・ Osmo Tapio Räihälä
・ Osmo Vepsäläinen


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Osmium(IV) chloride : ウィキペディア英語版
Osmium(IV) chloride

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Osmium(IV) chloride or osmium tetrachloride is the inorganic compound composed of osmium and chlorine with the empirical formula OsCl4. It exists in two polymorphs (crystalline forms). The compound is used to prepare other osmium complexes.
==Preparation, structure, reactions==
It was first reported in 1909 as the product of chlorination of osmium metal.
This route affords the high temperature polymorph:
:Os + 2 Cl2 → OsCl4
This reddish-black polymorph is orthorhombic and adopts a structure in which osmium centres are octahedrally coordinated, sharing opposite edges of the OsCl6 octahedra to form a chain. A brown, apparently cubic polymorph forms upon reduction of osmium tetroxide with thionyl chloride:
:OsO4 + 4 SOCl2 → OsCl4 + 2 Cl2 + 4 SO2
Osmium tetraoxide dissolves in hydrochloric acid to give the hexachloroosmate anion:
:OsO4 + 8 HCl → H2OsCl6 + Cl2 + 4 H2O

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