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Potassium Ruthenium Nitrite, 4KNO2.2Ru(NO2)3

Potassium Ruthenium Nitrite, 4KNO2.2Ru(NO2)3, is prepared by adding potassium nitrite to a dilute, acidified solution of ruthenium chloride at 60° C. until the solution just becomes alkaline. On concentrating slowly in the cold, orange-red crystals are obtained. With hydrochloric acid a nitroso derivative is obtained, whilst ammonium chloride decomposes it with evolution of nitrogen.

A basic salt, 8KNO2.Ru2O.(NO2)4, has also been isolated.

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