Halogan nuclear quadrupole resonance in tetrahedral halo complexes of zinc

Abstract

Halogen nuclear quadrupole resonance data are presented for a number of compounds containing tetrahedral ZnX₄^2- ions, where X = Cl, Br, and I. Characteristic mean frequencies are: for ³⁵Cl in ZnCl₄^2- 8.9 MHz ; for ⁸¹Br in ZnBr₄^2- 60 MHz; and for ¹²⁷I in ZnI₄^2- 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 ZnX₄^2- 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.