Abstract
Three of the nine isomeric N-(nitrobenzylidene) iodoanilines, C13H9IN2O2, have been found, when crystallized from acetone, to yield polymorphs which differ from those obtained upon crystallization from ethanol. In the second polymorph of 2-iodo-N-(2-nitrobenzylidene) aniline, the molecules are disordered across inversion centres in space group C2/c, but there are no direction-specific interactions between the molecules. In the second polymorph of 2-iodo-N-(3-nitrobenzylidene) aniline, the molecules adopt a different conformation from those in the first polymorph, and they are linked into sheets by a combination of a three-centre iodo - nitro interaction and an aromatic pi-pi stacking interaction, both of which are absent from the supramolecular structure of the first polymorph. The second polymorph of 3-iodo-N-(2-nitrobenzylidene) aniline crystallizes with Z' = 2 in space group P2(1), and the molecules are linked into sheets by one C-H center dot center dot center dot O hydrogen bond and two C - H center dot center dot center dot pi( arene) hydrogen bonds.
Original language | English |
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Number of pages | 5 |
Journal | Acta Crystallographica Section C-Crystal Structure Communications |
Volume | 61 |
DOIs | |
Publication status | Published - Jul 2005 |
Keywords
- PI-STACKING INTERACTIONS
- CENTER-DOT-NITRO
- CRYSTAL-STRUCTURE PREDICTION
- SMALL ORGANIC-MOLECULES
- HYDROGEN-BONDS
- INTERPLAY
- 1,4-DIIODOBENZENE
- PATTERNS