Nitrogen Dioxide

(NO2) [10102-44-0] NO2 (MW 46.01) InChI = 1S/NO2/c2-1-3 InChIKey = JCXJVPUVTGWSNB-UHFFFAOYSA-N (N2O4) [10544-72-6] N2O4 (MW 92.02) InChI = 1S/N2O4/c3-1(4)2(5)6 InChIKey = WFPZPJSADLPSON-UHFFFAOYSA-N (nitration of aromatic1, 2 and unsaturated3, 4 compounds; conversion of oximes into dinitromethanes;3, 5, 6 halogenation of arenes;7, 8 oxidation of many functional groups.9-11) Alternate Names: nitrogen tetroxide; dinitrogen tetroxide. Physical Data: a reddish-brown gas above 21.15 °C and a brown or yellow–brown liquid below 21.15 °C; mp 11.2 °C; bp 21.15 °C; d420 1.448 g cm−3, d(gas)21.3 3.3 g L−1; exists as N2O4 in liquid and solid state; as a mixture of NO2 and N2O4 in the gas phase; and as NO2 above 135 °C. Solubility: sol CCl4, CH2Cl2, DMF, ether, concd sulfuric and nitric acids. Form Supplied in: brown liquid under pressure. Preparative Methods: prepared by thermal decomposition of lead nitrate or from N2O5.12 Handling, Storage, and Precautions: deadly poison One of the most insidious gases. 100 ppm is dangerous and 200 ppm may be fatal. Decomposes in water or alkaline solutions. Use in a fume hood.