Abstract
The crystal structure of the title compound, C13H13NO2, is a polymorph of the structure first reported by Helliwell et al. [Acta Cryst. (2006), E62, o737-o738]. It is also monoclinic (space group P21/c), but with completely different cell constants. The molecular conformations of these polymorphs differ by a 180° rotation of one formyl group. The present molecule is planar [maximum deviation 0.089 (2) Å] with the exception of the two methyl groups which lie on either side of the plane. There are strong intra- and intermolecular N—H⋯O hydrogen bonds. The latter link pairs of molecules across crystallographic centers of symmetry. Two aldehyde O atoms are brought close together [2.896 (4) Å in this arrangement but are not hydrogen bonded. In the earlier polymorph, one formyl group is rotated by 180° to yield intermolecular hydrogen bonding and an infinite polymeric chain. The other formyl group is involved in the same intramolecular hydrogen bonding as has been found here.
Highlights
The crystal structure of the title compound, C13H13NO2, is a polymorph of the structure first reported by Helliwell et al [Acta Cryst. (2006), E62, o737-o738]
The molecular conformations of these polymorphs differ by a 180 rotation of one formyl group
The other formyl group is involved in the same intramolecular hydrogen bonding as has been found here
Summary
The crystal structure of the title compound, C13H13NO2, is a polymorph of the structure first reported by Helliwell et al [Acta Cryst. It is monoclinic (space group P21/c), but with completely different cell constants. The molecular conformations of these polymorphs differ by a 180 rotation of one formyl group. There are strong intra- and intermolecular N— HÁ Á ÁO hydrogen bonds. The latter link pairs of molecules across crystallographic centers of symmetry. One formyl group is rotated by 180 to yield intermolecular hydrogen bonding and an infinite polymeric chain. The other formyl group is involved in the same intramolecular hydrogen bonding as has been found here
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have