Polyhedral Clathrate Hydrates. VII. Structure of the Monoclinic Form of the Tri-n-Butyl Sulfonium Fluoride Hydrate

The monoclinic form of the clathrate hydrate of (n-C4H9)3S+F— has 23 H2O per guest cation, as determined by a complete three-dimensional crystal-structure analysis. The water framework consists of sheets of face-sharing pentagonal dodecahedra, separated by layers of hydrogen-bonded water molecules and anions containing large and irregular cavities in which the sulfonium ions are located. These cations are pyramidal in configuration and occupy the large cavities in pairs, with a S+–S+ nearest-neighbor distance of 3.49 Å.