Nuclear Magnetic-Dipole Coupling in Solid BF3

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Abstract
The nuclear magnetic resonances of 11B and 19F have been studied in solid polycrystalline BF3 at 77°K. From a study of the 11B resonance, the 11B nuclear quadrupole coupling constant was found to be 3.045±0.060 Mc/sec. The 19F resonance possessed an unusual asymmetric structure that is explainable in terms of a magnetic‐dipole interaction between a 19F nucleus and its nearest‐neighbor 11B nucleus. An analysis of this interaction revealed that the observed asymmetry of the 19F resonance indicates that the 11B quadrupole coupling constant is positive. Furthermore, the width of the 19F resonance leads to a value of 1.29 Å for the distance between nearest‐neighbor boron and fluorine atoms in the solid in excellent agreement with the known values for BF3 gas.