Abstract
Salicylaldoxime derivatives crystallize in either hydrogen-bonded ring or chain motifs. A polymorph of the parent compound, salicylaldoxime, characterized by ring formation, has been known for some time. We now report a new polymorph of salicylaldoxime (2-hydroxybenzaldehyde oxime, C7H7NO2), which exhibits chain formation and which has two molecules per asymmetric unit. π–π stacking interactions occur between the chains. We refer to this polymorph as salicylaldoxime-III.
Highlights
Salicylaldoxime derivatives crystallize in either hydrogenbonded ring or chain motifs
We report a new polymorph of salicylaldoxime (2-hydroxybenzaldehyde oxime, C7H7NO2), which exhibits chain formation and which has two molecules per asymmetric unit. – stacking interactions occur between the chains
O—H O hydrogen bonds to produce a dimer (Fig. 1b), for which the graph-set descriptor is R44 (10) (Bernstein et al, 1995). This dimeric form closely resembles the pseudomacrocyclic arrangement observed in metal complexes, and is only observed in the free ligands in the solid state in salicylaldoxime derivatives which carry small substituents [e.g. CSD doi:10.1107/S1600536806032375
Summary
Simon Parsons,a* Elna Pidcockb and Peter A. Taskera a School of Chemistry, University of Edinburgh, King’s Buildings, West Mains Road, Edinburgh. Salicylaldoxime derivatives crystallize in either hydrogenbonded ring or chain motifs. A polymorph of the parent compound, salicylaldoxime, characterized by ring formation, has been known for some time. – stacking interactions occur between the chains. We report a new polymorph of salicylaldoxime (2-hydroxybenzaldehyde oxime, C7H7NO2), which exhibits chain formation and which has two molecules per asymmetric unit. We refer to this polymorph as salicylaldoxime-III
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