Abstract
The preparation and analysis of a pure sample of ammonia-boron trifluoride is described. The proton and fluorine magnetic resonance spectra of this compound and also of ammonium fluorotitanate and ammonium fluorogermanate have been measured. The spectra from the fluorine nuclei at 90°K are consistent with a rigid arrangement of the fluorine nuclei in the lattice. The proton resonance spectra are, however, narrower than is possible in a rigid lattice structure and require reorientation of the NH 3 group and of the ammonium ions even at 20°K. This indicates a surprising weakness in the hydrogen bonds between the nitrogen and fluorine atoms. Other evidence which supports this conclusion is assembled in the discussion.
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