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A second monoclinic polymorph of 2-(diformyl­methyl­idene)-3,3-dimethyl-2,3-dihydro-1H-indole

The crystal structure of the title compound, C(13)H(13)NO(2), is a polymorph of the structure first reported by Helliwell et al. [Acta Cryst. (2006), E62, o737-o738]. It is also monoclinic (space group P2(1)/c), but with completely different cell constants. The mol­ecular conformations of these poly...

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Detalles Bibliográficos
Autores principales: Khaledi, Hamid, Saharin, Siti Munirah, Mohd Ali, Hapipah, Robinson, Ward T., Abdulla, Mahmood A.
Formato: Texto
Lenguaje:English
Publicado: International Union of Crystallography 2009
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2970324/
https://www.ncbi.nlm.nih.gov/pubmed/21578021
http://dx.doi.org/10.1107/S1600536809038495
Descripción
Sumario:The crystal structure of the title compound, C(13)H(13)NO(2), is a polymorph of the structure first reported by Helliwell et al. [Acta Cryst. (2006), E62, o737-o738]. It is also monoclinic (space group P2(1)/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.