Abstract
AbstractTwo NQR lines were observed for 35Cl in 2,5‐dichloro‐4‐nitroaniline at room temperature, using a self‐quenched super‐regenerative spectrometer. Analysis of the Zeeman effect on the two lines using a cylindrical single crystal reveals that the crystal belongs to the monoclinic system. The principal field gradient Z axes enclose an angle of 35° and 28° in the cases of the low and high frequency resonance lines, respectively. The b axis is parallel to 81°, 280°. The unit cell contains either two or a multiple of two molecules. The molecules in the crystal can be arranged into two sets, with the molecular planes in each set being parallel among each other. The angle subtended between the two planes is 159° and each of the planes is inclined to the b axis at an angle of 79.5°. There is an in‐plane bending of the two CCl bonds by 5.5°. The ionic, single bond and double bond characters of the CCl bonds for both chlorines are almost equal, and are in the ratio 24:73:3.
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