Hexaammineplatinum(IV) chloride is the chemical compound with the formula [Pt(NH<sub>3</sub>)<sub>6</sub>]Cl4. It is the chloride salt of the metal ammine complex [Pt(NH<sub>3</sub>)<sub>6</sub>]4+. The cation features six ammonia (called ammines in coordination chemistry) ligands attached to the platinum(IV) ion. It is a white, water soluble solid.
Typical for platinum(IV) complexes, [Pt(NH<sub>3</sub>)<sub>6</sub>]4+ is diamagnetic and kinetically inert, e.g. unaffected by strong acids. The cation obeys the 18-electron rule. It is prepared by treatment of methylamine complex [Pt(NH<sub>2</sub>CH<sub>3</sub>)<sub>4</sub>Cl<sub>2</sub>]Cl2 with ammonia.[1]
The complex [Pt(NH<sub>3</sub>)<sub>6</sub>]4+ is a rare example of a tetracationic ammine complex. Its conjugate bases [Pt(NH<sub>3</sub>)<sub>5</sub>NH<sub>2</sub>]3+ and [Pt(NH<sub>3</sub>)<sub>4</sub>(NH<sub>2</sub>)<sub>2</sub>]2+ have been characterized.[2]