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Ruthenium Tetrachloride
Ruthenium(IV) tetrachloride is volatile inorganic compound of ruthenium and chlorine with the formula . Synthesis Synthesis of ruthenium(IV) tetrachloride is formed by the action of chlorine gas on ruthenium(III) chloride at 750 °C: :: The RuCl4 is collected on a liquefied air cooled condenser and decomposes above -30 °C. The reaction was determined to have the following thermodynamic properties: * ΔH°298 = 36.6 kcal/mol (enthalpy) * ΔS°298 = 32.8 entropy units (entropy change) * = -6.6 cal/mol degree (change in heat capacity at constant pressure) * S°298 = 99.3 entropy units The degree signs indicate standard state. Properties Ruthenium(IV) tetrachloride decomposes above -30 °C: :: References {{Chlorides Chlorides Metal halides Ruthenium(IV) compounds ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Osmium Tetrachloride
Osmium(IV) chloride or osmium tetrachloride is the inorganic compound composed of osmium and chlorine with the empirical formula OsCl4. It exists in two Polymorphism (materials science), 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 crystal system, 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 + 10 HCl → H2OsCl6 + 2 Cl2 + 4 H2O References {{Chlorides Osmium com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |