Hydrogen Azide, HN

Hydrogen Azide (hydrazoic acid, azoimide, hydro-nitric acid, triazoic acid) HN N N Diimino-Hydrazine HN N.NH.NrNH Bisdiazoamine HN N.NH.N NH Hexazodiazene.HN N.NH.NH. N NH Heptazodiazene H2N.N N.NH.N N.NH2 Type formula NnHn ... 

Browne LundeIl(Ref 23) found pure anhyd HNj to have low electrical conductivity but the addn of potassium azide very greatly increased its conductivity. Hydrogen azide is sol in w, ale or eth and is itself a solvent for many substs as found by qual investigatiqns of McKinney (Ref 59). Vapors of HN, are considered dangerous (Refs 94,123,124 160) low concns produce eye irritation and headache, high concns affect the central nervous system and continued exposure may cause death (Refs 3,67,84,102,131 133). The gas, aq solns and its salts act as protoplasmic poisons (Refs 67,84,145 81151). Two cases of accidental poisoning have been reported (Refs 66,86)... 

Use. Liq HNj has been found by McKinney (Ref 39) to act as a solvent for many- substs, especially inorg compds Hydrogen Azide, Aqueous or Hydrozoic Acid (HA), HN, nHjO (aq distillate has contd up to 27% HNj, Ref 94, p 183) was first obtained in 1890 by Curtius(Ref 1) on treatment of benzoyl azide with NaOH, followed by distn with H,SO . Subsequently Cuftius used instead of NaOH, Na ethylate (Ref 5) and also ale ammonia(Ref 8). Methods of prepn employed by other investigators may be divided into the following general classes a)di>ec/ syntheses (Refs 78,88 131a) b) interaction of hydrazine and nitrous acid(Re(s 7,9,11,35,55,62 64) c)oxidation of hydrazine (Refs 15,19,20,21,22,36,42,48,49,52,68,74 ... 

Hydrazoic acid [Hydrogen azide] vapor. Ceiling value HN, 7782-79-8 0.11 ppm... 

Currently, the only other monoprotonated sapphyrin-monoanion complex to be solved by X-ray diffraction analysis is that of 3-HN,. As expected, in this complex the azide counteranion is bound above the sapphyrin plane by a combination of anisotropic electrostatic interactions and oriented hydrogen bonds (Figure 4). As such, this structure supports the conclusion, reached in the case of 3-HCl, that a single positive charge on the sapphyrin is enough to effect anion recognition of anionic substrates, at least in the solid state. 

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