PMCC PMCC

Search tips
Search criteria

Advanced
Results 1-1 (1)
 

Clipboard (0)
None

Select a Filter Below

Journals
Authors
Year of Publication
Document Types
1.  p-Phenyl­enediamine and its dihydrate: two-dimensional isomorphism and mechanism of the dehydration process, and N—H⋯N and N—H⋯π inter­actions 
p-Phenyl­enediamine can be obtained as the dihydrate, C6H8N2·2H2O, (I), and in its anhydrous form, C6H8N2, (II). The asymmetric unit of (I) contains one half of the p-phenyl­ene­diamine mol­ecule lying about an inversion centre and two halves of water mol­ecules, one lying on a mirror plane and the other lying across a mirror plane. In (II), the asymmetric unit consists of one mol­ecule in a general position and two half mol­ecules located around inversion centres. In both structures, the p-phenyl­enediamine mol­ecules are arranged in layers stabilized by N—H⋯π inter­actions. The diamine layers in (I) are isostructural with half of the layers in (II). On dehydration, crystals of (I) transform to (II). Comparison of their crystal structures suggests the most plausible mechanism of the transformation process which requires, in addition to translational motion of the diamine mol­ecules, in-plane rotation of every fourth p-phenyl­enediamine mol­ecule by ca 60°. A search of the Cambridge Structural Database shows that the formation of hydrates by aromatic amines should be considered exceptional.
doi:10.1107/S010827011000541X
PMCID: PMC2855568  PMID: 20203409

Results 1-1 (1)