Title
Conformational polymorphism of (E,E)-N,N′-bis(4-nitrobenzylidene)benzene-1,4-diamine Conformational polymorphism of (E,E)-N,N′-bis(4-nitrobenzylidene)benzene-1,4-diamine
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Copenhagen ,
Subject
Chemistry
Source (journal)
Acta crystallographica: section C: crystal structure communications. - Copenhagen
Volume/pages
67(2011) :5 , p. o171-o174
ISSN
0108-2701
ISI
000290223300021
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Two polymorphs of (E,E)-N,N′-bis(4-nitrobenzylidene)benzene-1,4-diamine, C20H14N4O4, (I), have been identified. In each case, the molecule lies across a crystallographic inversion centre. The supramolecular structure of the first polymorph, (I-1), features stacking based on ππ interactions assisted by weak hydrogen bonds involving the nitro groups. The second polymorph, (I-2), displays a perpendicular arrangement of molecules linked via the nitro groups, combined with weak CH...O hydrogen bonds. Both crystal structures are compared with that of the carbon analogue (E,E)-1,4-bis[2-(4-nitrophenyl)ethenyl]benzene, (II).
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