Nuclear Quadrupole Resonances of Tellurium Tetrachloride and Tellurium Tetrabromide
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概要
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The nuclear quadrupole resonances (NQR) due to <SUP>35</SUP>Cl and <SUP>81</SUP>Br in TeCl<SUB>4</SUB> and TeBr<SUB>4</SUB> have been observed and their Zeeman effects have been examined. Each spectrum consists of six resonance lines with equal intensities, which are assigned to the two species of TeCl<SUB>3</SUB><SUP>+</SUP> ions or TeBr<SUB>3</SUB><SUP>+</SUP> ions. The asymmetry parameter of the electric-field gradient is, at most, 5% in each case. The relative orientation among the zero-splitting patterns of six resonance lines is consistent with the crystal structure of TeCl<SUB>4</SUB>, which consists of the tetramers of (TeCl<SUB>3</SUB>+Cl-)<SUB>4</SUB>, as was recently determined by X-ray diffraction analysis. The zero-splitting patterns of the TeBr<SUB>4</SUB> crystal are so similar to those of TeCl<SUB>4</SUB> that the former crystal seems likely to consist of tetramers of (TeBr<SUB>3</SUB><SUP>+</SUP>Br-)<SUB>4</SUB> as well. The average ∠X–Te–X bond angles in TeX<SUB>3</SUB><SUP>+</SUP> ions were found to be 95.9° for the chloride and 96.7° for the bromide. The values for the chloride are in good agreement with those obtained by the X-ray analysis. On the other hand, the bond character of the TeX<SUB>3</SUB><SUP>+</SUP> ions in TeX<SUB>4</SUB>AlX<SUB>3</SUB> (X=C1, Br) was compared with that of TeX<SUB>4</SUB> from NQR.
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