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Title
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Conformational polymorphism of (E,E)-N,N′-bis(4-nitrobenzylidene)benzene-1,4-diamine
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Author
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Abstract
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| 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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Language
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English
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Source (journal)
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Acta crystallographica: section C: crystal structure communications. - Copenhagen
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Publication
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Copenhagen
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2011
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ISSN
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0108-2701
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DOI
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10.1107/S0108270111010109
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Volume/pages
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67
:5
(2011)
, p. o171-o174
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ISI
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000290223300021
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Full text (Publisher's DOI)
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