Halogen nuclear quadrupole
resonance data are presented for a number of compounds containing tetrahedral ZnX42- ions, where X = Cl, Br, and I. Characteristic mean frequencies are: for 35Cl in ZnCl42-
8.9 MHz ; for 81Br in ZnBr42-
60 MHz; and for 127I in ZnI42-
75 and 150 MHz. The number and relative intensities of the resonances for any
compound is found to be a useful indication of the site symmetry of the ZnX42- ion, and compounds
of unknown structure are examined in this light. 35Cl
data are also presented for Cs2CuCl4,
which has a mean frequency of 10.6 MHz at 298�K.
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