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![[Figure 3]](fg3190fig3mag.jpg)
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Figure 3
(a) A standard T4 hydrogen-bonding pattern found in the crystal structures of dipeptides (Görbitz, 2010  ). The two horizontal head-to-tail chains are coloured in red (colours relate to the electronic version of the paper); the C(4) chain involving the amide N—H⋯O and two additional Cα—H⋯O interactions form vertical one-dimensional hydrogen-bonded tapes coloured in blue. The separation between tapes is called d. (b) Hydrogen bonding in an individual sheet of (I) (highlighted in blue in Fig. 2a), including interactions with the fully occupied water molecules, O1W and O2W, in the water channel. The O atoms of the L-Ser hydroxy groups coming from the adjacent layer have, as in Fig. 2(a), been coloured in violet. L-His H atoms on Cβ have been omitted. (c) Hydrogen bonding in a sheet in the structure of Gly-L-Tyr dihydrate (Cotrait & Bideau, 1974). The L-Tyr side chains have been hidden, except for the hydroxy groups of dipeptide molecules in the adjacent layer. Hydrogen-bonded tapes have been coloured in blue in (b) and (c) in the same way as in (a). |
![[Figure 3]](fg3190fig3.jpg)
 | STRUCTURAL CHEMISTRY |
ISSN: 2053-2296
