Abstract
The title compound, C20H20Br2N2O2, a tetradentate Schiff base, is the enantiomerically pure R,R-diastereomer of four possible stereoisomers. The molecular structure reveals two strong intramolecular O—H⋯N hydrogen bonds between the hydroxy O atom and the imino N atom, which each generate S(6) rings. In the crystal, molecules are stacked in columns along the a axis; when viewed down the b axis, successive columns are stacked in the opposite direction. The structure reported herein is the monoclinic polymorph of the previously reported orthorhombic form [Yi & Hu (2009 ▶). Acta Cryst. E65, o2643], in which the complete molecule is generated by a crystallographic twofold axis.
Highlights
Molecules are stacked in columns along the a axis; when viewed down the b axis, successive columns are stacked in the opposite direction
E65, o2643], in which the complete molecule is generated by a crystallographic twofold axis
The title compound is a tetradentate Schiff base (Fig. 1), which can act as a dibasic ligand, i.e. the N and O donor atoms can coordinate one metal ion
Summary
R factor = 0.039; wR factor = 0.108; data-to-parameter ratio = 16.5. The title compound, C20H20Br2N2O2, a tetradentate Schiff base, is the enantiomerically pure R,R-diastereomer of four possible stereoisomers. The molecular structure reveals two strong intramolecular O—H N hydrogen bonds between the hydroxy O atom and the imino N atom, which each generate. Molecules are stacked in columns along the a axis; when viewed down the b axis, successive columns are stacked in the opposite direction. The structure reported is the monoclinic polymorph of the previously reported orthorhombic form [Yi & Hu (2009). E65, o2643], in which the complete molecule is generated by a crystallographic twofold axis
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