The NQR frequency of 35Cl has been observed in polycrystalline PCl3, POCl3, AsCl3, and SbCl3 at 77°K and above. In all cases, the resonance frequency decreases at higher temperatures. The temperature coefficient of the resonance frequency is analyzed according to a modified Bayer-type treatment. A qualitative examination of the experimental results, including Robinson’s results for BiCl3 at 83 and 299°K, reveals that the strength of the intermolecular interactions in the solids of these trichlorides decreases in this order: BiCl3>SbCl3>AsCl3>PCl3. The resonance was found to “fade-out” at temperatures below the melting point for the solids of PCl3 and POCl3, while the resonance was observed up to the melting point for the other compounds. The origin of this phenomenon is discussed.
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Hashimoto et al. (1971) studied this question.
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