Manganese tetrachloride is a binary inorganic compound of manganese and chlorine with the chemical formula .
Synthesis Pure manganese(IV) chloride has never been isolated. According to Holleman and Wiberg (2016), it is likely to be an intermediate in the reaction between manganese dioxide and hydrogen chloride gas:
Earlier works claim the compound is formed by treating manganese dioxide with cold, concentrated hydrochloric acid, resulting in a dark-brown solution.
Other reactions with higher oxides are also possible:
is thermally unstable and liberates chlorine gas during these reactions and in solution at STP.(STP is 25C/77F 101.3kPa)
Physical properties The metal chloride is a highly unstable, dark-brown compound that easily decomposes, though a stable form can exist in solution at low temperatures, usually in the form of or coordination-complex anions with excess which then decompose favorably on formation of neutral . is often distinguished from the more common and stable manganese(II) chloride ().
Reactions A reagent for the α-chlorination of enolizable ketones, derived from the reaction of manganese(IV) oxide with chlorotrimethylsilane () or acetyl chloride (), is claimed to contain manganese(IV) chloride.
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