摘要:
N-Octanoylglyoxylic amides have been synthesized from N-octanoylisatins and their self-assembly analyzed in the solid state by X-ray crystallography. Of the seven compounds, only two utilize intramolecular N1-H1 center dot center dot center dot O2 hydrogen bonds, whereas five of them forgo this intramolecular hydrogen bond to achieve two centrosymmetric N-H center dot center dot center dot O bonds possessing a non-planar conformation with intramolecular triple C=O center dot center dot center dot C=O dipolar contacts. These alternative conformations with resulting intermolecular interactions influence the self-assembly process distinctly; the former have molecules packed in chiral space groups whereas the latter associate in non-chiral space groups. (C) 2013 Elsevier Ltd. All rights reserved.