Potassium Bromruthenite, K₂RuBr₅

Potassium Bromruthenite, K₂RuBr₅, is formed when potassium bromide is added to a solution of ruthenium tetroxide in hydrobromie acid. Upon concentration over sulphuric acid small brown crystals are obtained, readily soluble, with decomposition, in water.

The corresponding ammonium, rubidium, and caesium derivatives have been prepared.

Although the tetrabromide of ruthenium has not been isolated, double salts, known as bromruthenates, have been prepared.