NH43RuCl6

NH43RuCl6 is the chemical formula for the ammonium salt of the hexachlororuthenate(III) anion, typically written as (NH4)3[RuCl6]. In this compound ruthenium is in the +3 oxidation state and is coordinated by six chloride ligands in an octahedral [RuCl6]3− anion. The three ammonium cations balance the charge of the complex, yielding a neutral salt.

The solid consists of an ionic lattice composed of discrete [RuCl6]3− anions and NH4+ cations. The [RuCl6]3− unit exhibits octahedral symmetry around the ruthenium center. In aqueous solutions, the hexachloro ruthenate(III) species can participate in hydrolysis and ligand-exchange equilibria depending on chloride concentration and pH, and the salt is generally soluble in water.

Synthesis of (NH4)3[RuCl6] can be achieved by treating RuCl3 with ammonium chloride under chloride-rich conditions to form the hexachloro complex anion, followed by crystallization with ammonium salts to yield the salt. The procedure typically emphasizes maintaining an oxidizing, chloride-rich environment to promote formation of the [RuCl6]3− anion and its association with NH4+.

Applications and safety: This compound is primarily of interest in inorganic and coordination chemistry as a precursor for other ruthenium(III) complexes and for structural studies. It is handled as an inorganic salt with standard safety precautions; ruthenium compounds can be toxic if ingested or inhaled, and appropriate protective equipment and containment should be used.