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Figure 6
Partial packing diagrams showing the different hydrogen-bonding inter­actions and different mol­ecular arrangements in the crystal packing of some polymorphic forms. (a) Helical chain of the D(2) type in the noncentrosymmetric form of 5-nitro­uracil (CSD refcode NIMFOE02; Srinivasa Gopalan et al., 2000BB42). (b) Centrosymmetric R22(8) dimers in the centrosymmetric form of 5-nitro­uracil (NIMFOE01; Srinivasa Gopalan et al., 2000BB42). (c) Inversion-related chains inter­connected by R22(8) dimers in the centrosymmetric form of 5-fluoro­uracil-1-acetic acid (WEFVIN; Qu et al., 2006BB34). (d) Helical arrangement of R22(8) dimers in the noncentrosymmetric form of 5-fluoro­uracil-1-acetic acid (WEFVIN02; Zhang et al., 2007BB47).

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 71| Part 2| January 2015| Pages 128-135
doi:10.1107/S2053229615000492
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