Abstract
At 10–20 K the broad room temperature IR bands of the hydrogen bonded cluster anions in tetramethylammonium fluoride and hydroxide monohydrates and monohydrates- d n are resolved into a number of components. The band patterns are consonant with distortion of formally tetrahedral H 4F 2O 2 2− and H 6O 4 2− ions of T d point group to C2v and S 4, respectively in a C 4h 5 unit cell isomorphous with tetramethylammonium hexafluorosilicate. A lattice mode has been identified for each monohydrate.
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