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Figure 5
Partial packing diagrams showing the same hydrogen-bonding inter­actions among polymorphic forms having different mol­ecular arrangements in the crystal packing. (a) Ribbons formed by R22(8) dimers are arranged in a helical fashion in the noncentrosymmetric form of 5-fluoro­cytosine (CSD refcode MEBQEQ01; Hulme & Tocher, 2006BB21). (b) Centrosymmetrically related ribbons are observed in the centrosymmetric form of 5-fluoro­cytosine (MEBQEQ; Hulme & Tocher, 2006BB21). (c) Inversion-related mol­ecules are linked by O—H⋯O catemers in the centrosymmetric form of methyl paraben (CEBGOF03; Nath et al., 2011BB29). (d) Glide-related mol­ecules are connected by O—H⋯O catemers in the noncentrosymmetric form of methyl paraben (CEBGOF05; Gelbrich et al., 2013BB17).

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