Nine isomeric nitrobenzylidene-iodoanilines: interplay of C-H...O hydrogen bonds, iodo...nitro interactions and aromatic [pi]...[pi] stacking interactions

C Glidewell, R A Howie, J N Low, J M S Skakle, S M S V Wardell, J L Wardell

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Nine isomeric nitrobenzylidene-iodoanilines, O2NC6H4CH=NC6H4I [(I)-(IX)], have been synthesized and the structures of all except 4-nitrobenzylidene-4'-iodoaniline (IX) have been analyzed. 2-Nitrobenzylidene-2'-iodoaniline (I) contains isolated molecules, while 3-nitrobenzylidene-2'-iodoaniline (II) and 2-nitrobenzylidene-3'-iodoaniline (IV) both contain chains of molecules linked by C-H...O hydrogen bonds: similar chains in 4-nitrobenzylidene-2'-iodoaniline (III) are further linked by aromatic pi...pi stacking interactions, forming sheets. In both 3-nitrobenzylidene-3'-iodoaniline and 4-nitrobenzylidene-3'-iodoaniline, (V) and (VI), a combination of C-H...O hydrogen bonds and iodo...nitro interactions generates molecular ladders that are linked into sheets by aromatic pi...pi stacking interactions, while in 2-nitrobenzylidene-4'-iodoaniline and 3-nitrobenzylidene-4'-iodoaniline, (VII) and (VIII), which both crystallize with Z' = 2 in C2/c and P (1) over bar 1, respectively, the combination of C-H...O hydrogen bonds and iodo...nitro interactions generates sheets, which in (VIII) are further linked by pi...pi stacking interactions to form a three-dimensional structure. The 4,4'-isomer (IX) crystallizes in Fdd2 with Z' = 2, but both molecules are intractably disordered.

Original languageEnglish
Pages (from-to)864-876
Number of pages13
JournalActa Crystallographica Section B, Structural Science
Issue number5
Publication statusPublished - Oct 2002



  • molecules
  • patterns
  • crystals
  • nitrobenzylidene-iodoanilines
  • hydrogen bonds
  • iodo...nitro interactions
  • [pi]...[pi] stacking interactions

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