Abstract
New polyhydrate 18-crown-6C3H7NH3F-10H2O which melts incongruently at —0.8̊C has been found in the 18-crown-6-C3H7NH3F-H2O system; a single crystal X-ray structure of this layered hydrate is reported, in which layers of water molecules and fluoride anions are made up of tetra-, penta- and heptagons and also contain vacant polyhedral cavities; the crown ether complexes with cations C3H7NH3 + are situated between water-fluoride layers and do not form hydrogen bonds with the molecules of the layers.
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