Na2RuCl6

Na2RuCl6 is the sodium salt of the hexachlororuthenate(IV) anion, written commonly as Na2[RuCl6]. The compound consists of the hexachlororuthenate dianion [RuCl6]2− balanced by two Na+ counterions. The ruthenium center is in the +4 oxidation state and is coordinated by six chloride ligands in an octahedral arrangement.

In the [RuCl6]2− anion, ruthenium is surrounded by six chloride ligands, giving an octahedral geometry typical of hexachlorometallate ions. The solid Na2RuCl6 and related hexachlorometallate salts are used in coordination chemistry as sources of [RuCl6]2− and as precursors to various ruthenium(IV) chlorometallate complexes. In aqueous or strongly chloride-containing media, the dianion remains intact, while sodium counterions help stabilize the lattice or solution species.

Synthesis generally involves oxidation of RuCl3 in the presence of a high chloride concentration to generate the hexachlororuthenate(IV) anion, [RuCl6]2−. The resulting solution or suspension can be converted to the sodium salt by metathesis with a sodium salt source, yielding Na2[RuCl6]. Related salts include K2[RuCl6] and other alkali metal hexachlororuthenates, which share similar structures and reactivity patterns.

Applications of Na2RuCl6 are predominantly in inorganic synthesis and research as a versatile precursor to ruthenium(IV) chloride complexes. It is less common in industrial use and is mainly encountered in laboratory studies of coordination chemistry and solid-state materials containing hexachlorometallate units.

Safety considerations follow standard practices for inorganic chloride salts and metal complexes: handle with appropriate personal protective equipment, work in a well-ventilated area, and dispose of waste according to local regulations.