Cs2RuCl6

Cs2RuCl6 is an inorganic salt with the formula Cs2RuCl6, consisting of RuCl6 octahedra balanced by two Cs+ cations per formula unit. In this compound ruthenium is in the +4 oxidation state, and the six chloride ligands define octahedral coordination around Ru. Cs2RuCl6 belongs to the family of halide compounds A2MX6, which are often described as vacancy-ordered derivatives of perovskites. In the solid, the RuCl6 octahedra are typically isolated from one another by Cs+ ions, forming a three-dimensional lattice that reflects a high-symmetry arrangement.

Synthesis of Cs2RuCl6 can be achieved through solid-state reactions between RuCl3 and CsCl at elevated temperatures, as well as through solvothermal or hydrothermal routes that yield crystalline material. Purification and isolation are typically accomplished by crystallization from halide-rich media or standard solid-state techniques.

Research interest in Cs2RuCl6 centers on its electronic structure and magnetic properties arising from Ru4+ (d4) in an octahedral chlorine environment. As part of the Cs2MX6 class of halide materials, Cs2RuCl6 serves as a model system for studying 4d transition metal coordination chemistry, spin-orbit coupling effects, and related phenomena in halide-ordered structures. It is also examined as a potential precursor to related ruthenium halide compounds and for insights into the broader chemistry of vacancy-ordered perovskite derivatives. Safety considerations follow those for inorganic halide solids, including proper handling of Ru-containing powders and avoidance of inhalation or ingestion of dust.