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3,3'-Dichloro-biphenyl-4,4'-diaminium sulfate
Acta Crystallographica. Section E, Structure Reports Online
|November 18, 2011
Abstract:
In the title compound, C(12)H(12)Cl(2)N(2) (2+)·SO(4) (2-), the two rings are not coplanar [dihedral angle = 48.7 (2)°]. In the crystal, multiple N-H⋯O hydrogen-bond inter-actions are found between the ammonium and sulfate groups.
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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.

