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Acta Cryst. (2002). E58, o1040-o1042 [ doi:10.1107/S1600536802015295 ]
5-(Trifluoromethyl)uracil
Abstract: The title compound, 5-trifluoromethyl-1H-pyrimidine-2,4-dione, 5-CF3-C4H3N2O2 or C5H3F3N2O2, (I), displays marked differences in packing compared to the non-fluorinated parent molecule, 5-CH3-C4H3N2O2, i.e. thymine. Compound (I) forms a complicated three-dimensional array using hydrogen bonds [range 2.808 (3)-2.814 (3) Å], resulting in channels or voids parallel to [001], which are lined with F atoms from the CF3 groups.
Online 31 August 2002
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