| Chromium Azide, Cr(N3)3, is obtained as a dark green amorphous mass by prolonged treatment of a solution of crystallised chromium nitrate in absolute alcohol with anhydrous sodium sulphate, and evaporation of the filtered liquid with the requisite quantity of sodium azide in a vacuum. The azide is very hygroscopic, and if its alcoholic solution is not thoroughly dry, partial hydrolysis occurs, basic azides of composition Cr(OH)(N3)2 and Cr(OH)2N3 being formed. A double compound with sodium, Cr(N3)3.3NaN3, has been obtained in the form of green crystals. |