Acta Cryst. (2004). E60, o788-o790 [ doi:10.1107/S1600536804008438 ]
Abstract: The title compound, C29H8F16I4O4·2C5H5NO·H2O, is composed of the tetrakis-p-iodotetrafluoroether of pentaerythritol, pyridine N-oxide and water. It is characterized by the presence of both halogen bonds and hydrogen bonds connecting the three components. The two particularly short IO halogen bonds (<2.9 Å) involve one pyridine N-oxide molecule and water. Consistent with the n-* character of the IO halogen bond, the shorter the IO interaction is, the greater the lengthening of the corresponding C-I bond. As is often the case in similar compounds, the C-IO angles are approximately linear. The structure shows thin hydrocarbon layers alternating with thick perfluorocarbon layers.
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