Zeeman Effect of Nuclear Quadrupole Resonance Spectrum in 1, 3, 5-Trichlorobenzene

Abstract

A study of the Cl³⁵ resonance spectrum was carried out at the room temperature on a single crystal of 1, 3, 5-trichlorobenzene. Spatial orientation of the C–Cl bonds was determined to the accuracy of 1° . An orthorhombic structure was concluded, with the unit cell containing at least four equivalent molecules oriented with the symmetry of D_2h. The angles between the C–Cl bonds in each molecule were close to the hexagonal angle, but one of the C–Cl bonds was deformed by ca. 1.6° from the plane of the other two. The asymmetry parameters were observed to be 0.09₃, 0.11₁, and 0.12₉ for three absorption lines, 35.020 Mc, 35.296 Mc, and 35.545 Mc, respectively. The results were discussed from the viewpoint of intermolecular interaction.