Ruthenium tetrachloride explained

Ruthenium(IV) tetrachloride is volatile inorganic compound of ruthenium and chlorine with the formula .^{[1] [2]}

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:^[3]

Notes and References

1. Kolbin, N. I.; Ryabov, A. N.; Samoilov, V. M . 1963 . Preparation of solid ruthenium tetrachloride . Zhurnal Neorganicheskoi Khimii . 8 . 6 . 1543–1545.
2. Bell . Wayne E. . Garrison . M. C. . Merten . Ulrich . THERMODYNAMIC PROPERTIES OF GASEOUS RUTHENIUM CHLORIDES AT HIGH TEMPERATURE¹ . March 1961 . The Journal of Physical Chemistry . en . 65 . 3 . 517–521 . 10.1021/j100821a029 . 0022-3654.
3. Kolbin, N. I.; Samoilov, V. M.; Ryabov, A. N. . 1964 . Gaseous ruthenium chlorides . Khim. Redkikh Elementov, Leningr. Gos. Univ. . 50–56.