Zeeman effect of Cl35 NQR in 2,4-α-α-α- pentachlorotoluene and p-chloroaniline

Abstract

Zeeman effect studies of Cl35 nuclear quadrupole resonance have been carried out at room temperature in single crystals of 2,4-α-α-α- pentachlorotoluene and p-chloroaniline. Two field gradients have been found in the crystal 2,4-α-α-α- pentachlorotoluene, one for each chlorine in the 2 and 4 positions. The crystal class is identified as monoclinic. The orientation of the principal axes has been found with respect to the crystallographic axes. The asymmetry parameter cell, and the C–Cl bond characters are estimated. Two inequivalent field gradients have been found in the crystal p-chloroaniline. The two z axes of the field gradients lie in the ab plane. A comparison of the present results with Meal's data and x-ray data has been made. It was also found that there is a possibility of different growth habit for the cylindrical crystals in p-chloroaniline and 2,4-α-α-α- pentachlorotoluene.