Measurement of the Quadrupole Coupling Constant and Asymmetry Parameter of the Ring Deuterons in Several Deuterated Benzene Derivatives

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Abstract
Measurements are reported of the magnitude and asymmetry of the ring deuteron quadrupole coupling tensor in several simple deuterated benzene derivatives, i.e., benzene, toluene, ethylbenzene, as well as naphthalene, pyridine, and cyclohexane, using polycrystalline specimens at 77°K and in a magnetic field strength of 24 kOe. The e 2 qQ/h and η values obtained are: benzene, 180.7 ± 1.5 kHz , 0.041 ± 0.007 ; toluene, 179.9 ± 1.7 kHz , 0.056 ± 0.002 ; ethylbenzene, 177.8 ± 2.2 kHz , 0.063 ± 0.003 ; pyridine, 178.0 ± 1.2 kHz , 0.039 ± 0.006 ; cyclohexane, 173.7 ± 1.7 kHz , ≤ 0.01 ; naphthalene, 176.7 ± 1.5 kHz , 0.053 ± 0.005 .