Acta Crystallographica Section C

Crystal Structure Communications

Volume 69, Part 12 (December 2013)

organic compounds

Acta Cryst. (2013). C69, 1534-1536    [ doi:10.1107/S0108270113030746 ]

Imidazolidin-2-one: pseudosymmetry and twinning

C. Taouss, P. G. Jones and D. J. Tindall

Abstract: The title compound, C3H6N2O, crystallizes with imposed twofold symmetry in the space group I41/a. The five-membered ring displays a half-chair conformation. N-H...O hydrogen bonds connect the mol­ecules to form R22(8) rings and thence ribbons parallel to the a and b axes. These inter­sect via O2H2 rings involving longer H...O contacts. The crystal was merohedrally twinned. Preliminary indications of the higher symmetry space group I41/amd, which would require the ring to be planar, proved to be incorrect. A previous brief report of the structure in Fdd2 is also probably incorrect.

CCDC reference: 971130

Formula: C3H6N2O

Keywords: crystal structure; imidazolidin-2-one; twinning; pseudosymmetry; hydrogen bonding.

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[ doi:10.1107/S0108270113030746/fg3316Isup3.cml ]
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