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(hī`drəzēn'), chemical compound, formula NH2NH2, m.p. 1.4°C;, b.p. 113.5°C;, specific gravity 1.011 at 15°C;. It is very soluble in water and soluble in alcohol. At ordinary temperatures it is a colorless, fuming liquid that has an ammonialike odor, but when frozen it forms white crystals. Hydrazine is corrosive and a strong reducing agent, but it is a weaker base than ammoniaammonia,
chemical compound, NH3, colorless gas that is about one half as dense as air at ordinary temperatures and pressures. It has a characteristic pungent, penetrating odor.
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. It reacts with water to form hydrazine hydrate, N2H4·H2O, a colorless liquid that boils at 120°C;. Hydrazine can be prepared (usually as the hydrate) by reacting ammonia with chloramine, NH2Cl, in the presence of glue or gelatin. The glue or gelatin inhibits decomposition of the hydrazine. Ammonium chloride is a byproduct. The chloramine may be prepared by reacting ammonia with a hypochlorite or chlorine gas. Hydrazine is also prepared by reaction of sodium hypochlorite with urea in the presence of glue or gelatin. Hydrazine is dibasic and forms many salts, e.g., mono- and di-hydrochlorides, mono- and di-nitrates, and two sulfates. The major use of hydrazine is as a rocket fuel because it burns rapidly, producing a large amount of heat. Hydrazine and its derivatives are also used in the manufacture of algicides, fungicides, insecticides, and agricultural chemicals; in rubber curing and the manufacture of foam rubber and plastics; in soldering fluxes; and as a corrosion inhibitor in boiler feedwater. Isoniazidisoniazid
, drug used to treat tuberculosis. Also known as isonicotinic acid hydrazide, isoniazid is the most effective antituberculosis drug currently available. The drug inhibits or kills the tubercle bacilli that cause the disease.
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, a drug used in treatment of tuberculosis, is isonicotinic hydrazide.



(also called diamide), H2N—NH2, a colorless, hygroscopic liquid that fumes in air. Boiling point, 113.5° C; melting point, 2° C; density, 1,008 g/cm3 (at 20° C). Hydrazine is absolutely soluble in water and low alcohols. It is insoluble in hydrocarbons and other organic solvents. Aqueous solutions of hydrazine are basic (KHydrazine = 8.5 x 10−7). With acids it forms salts of hydrazone, such as N2H5C1 and N2H6C12. Hydrazine is characterized by a high dielectric constant (52.9 at 20° C) and is able to dissolve many inorganic salts.

Hydrazine is an endothermal compound; heat of formation ΔHHydrazine (1) = 50.24 kilojoules per mole (12.05 kilocalories per mole). Upon heating to 200°-300° C, hydrazine decomposes to N2 and NH3. In the presence of Fe203, it ignites at room temperature. A mixture of hydrazine vapor with air at a content of 4.67 percent or more by volume forms an explosive mixture. Liquid hydrazine is not sensitive to impact, friction, or detonation. It is toxic; the maximum permissible concentration in air is 0.0001 mg/l. Hydrazine is produced by oxidation of NH3 or urea by hypochloride. It is used in organic synthesis, as a component of liquid rocket fuels, and in the production of plastics, cured rubber, insecticides, and explosives.


Audrieth, L., and B. Ogg. Khimiia gidrazina. Moscow, 1954. (Translated from English.)



(inorganic chemistry)
H2NNH2 A colorless, hygroscopic liquid, boiling point 114°C, with an ammonialike odor; it is reducing, decomposable, basic, and bifunctional; used as a rocket fuel, in corrosion inhibition in boilers, and in the synthesis of biologically active materials, explosives, antioxidants, and photographic chemicals.
References in periodicals archive ?
In the case of an equimolar or 2/1 ratio of protected hydrazine and benzyl bromide, relatively poor yields ranging from 13% to 30% were obtained at room temperature.
Currently, there are lots of articles about the impact of hydrazine and its derivatives on the lymphatic system in medical and biological literature.
The decrease may be due to the reaction of the free phenyl hydrazine with the iron (III) chloride which may lead to de-colorization.
It potentially could have a shorter launch processing time than hydrazine, which also would cut costs, Myers said.
1], which clearly proves the bidentate bridging nature of the hydrazine ligand [17].
All 65 patients received the same chemotherapy and dietary counseling, but some got 60 mg of oral hydrazine sulfate, three times/day, and the rest took a placebo.
The NROL-21, invariably described as being the size of a bus, carried a tankful of toxic hydrazine fuel.
But it is carrying more than 1,000lb of hydrazine fuel and may release much of it as a toxic gas.
The satellite has thrusters, small engines used to position it in space, that contain the toxic rocket fuel hydrazine.
Only a few references are available regarding either the formation of ketazines or for the production of hydrazine hydrate through ketazine route, mainly using hydrogen peroxide including patents (Eichenhofer and Sehliebs, 1976, 1977; Schirmann et al.
The technology, proposed by engineers at Daihatsu, a unit of Toyota, in Ryuo, Japan, uses a fuel called hydrazine hydrate, instead of hydrogen.