Atomistry » Carbon » Chemical Properties » Cyanogen Bromide
Atomistry »
  Carbon »
    Chemical Properties »
      Cyanogen Bromide »

Cyanogen Bromide, CNBr

Cyanogen Bromide (Bromocyanogen), CNBr, resembles Cyanogen Chloride, CNCl in its manner of preparation, being formed by the action of bromine on hydrocyanic acid or a cyanide. It forms transparent prisms by sublimation, which pass into a cubical form; it melts at 52° C., and boils at 61.3° C.; its vapour density is 3.607; it is poisonous, and its vapour is pungent and affects the eyes. The heat of formation of CNBr from its elements is -37,000 calories, and from (CN)2 and Br2 +40,000 calories. It easily polymerises to (CNBr)3.

In dilute aqueous solution cyanogen bromide shows no evidence of ionisation. Hydrogen sulphide reacts quantitatively with it, thus:

CN-Br + H2S = HCN + HBr + S;

and the following reactions are also characteristic:

2KOH + CNBr = KBr + KCNO + H2O
Na2SO3 + CNBr + H2O = NaBr + NaCN + H2SO4
HI + CNBr = IBr + HCN; IBr + HI = HBr + I2
K2S + CNBr = KBr + KSCN.

A theory of the mechanism of these reactions is given by Dixon and Taylor.

Last articles

Tb in 6TVY
Si in 6Y7O
Rh in 6WRM
Rh in 6WRL
Ni in 6Y8Z
Ni in 6Y8Y
Na in 6ZXZ
Na in 7ACG
Na in 6YLS
Na in 6Y8Z
© Copyright 2008-2020 by
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy