Chemistry

Two Ways to Trap Water

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Science  26 Mar 2004:
Vol. 303, Issue 5666, pp. 1949
DOI: 10.1126/science.303.5666.1949a

Clusters and networks of water molecules in highly hydrated organic crystals can provide clues into the structures that make up bulk water. Ma et al. have grown crystals of bpedo [trans-bis(4-pyridyl)ethylene dioxide], a molecule that readily forms hydrogen bonds, which contain one-dimensional (1D) chains (when grown from methanol solution) or 2D hydrogen-bonded water layers (when grown from aqueous solution). In both forms, the water structures interact with the bpedo molecules to extend the structure in three dimensions. The 2D arrays contain (H2O)12 rings that are similar to those found in ice Ih, but that exhibit an unusual pseudo C3v symmetry. These rings are stable from 90 K up to room temperature. — PDS

Angew. Chem. Int. Ed. 43, 1374 (2004).

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