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Zeeman perturbed   35 Cl NQR, using a FT-NQR pulsed spectrometer. The four lines at zero-field, ν 1  = 27.6468, ν 2  = 27.3070, ν  3  = 25.7341 and ν  4  = 25.3438 MHz yield eight EFG tensors in the  magnetic field, related by a twofold symmetry element in the crystal. The corresponding  asymmetry parameters are η 1 , = 0.134, η 2  = 0.13, η  3  = 0.07, and η 4  = 0.09. The molecular structure  deduced from the relative orientations of the principal Z-axes of the EFG tensors confirms that the  higher quadrupole coupling constants are associated with the chlorine atoms in equatorial positions,  relative to the plane of the organic ligand, as predicted from NQR powder studies. It is concluded  that the crystal structure is monoclinic with two (class m or  2 ) or four (class 2/m) molecules  per unit cell. The molecular packing is such that the planes formed by equatorial or axial chlorine  atoms are approximately at right angles to their symmetry related images.

(CH 3 ) 3 CCOOSbCl 4 : Structure Determination by Zeeman Perturbed NQR