Deuteron quadrupole coupling in solid 3,6dichloropyridazined 2 and in antimony triphenyld 15

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A pulsed nuclear magnetic resonance method has been used to determine both the apparent melting point and the impurity correction for samples of ethane and three of its deuterated modifications. The true melting points were found to be: CH3CH3 89.82°K ., CH3CD3 89.13°K., CHD2CHD2 89.89°K ., and CHD2CD3 89.82°K.

The proton spin–lattice relaxation time T1 has been measured in gaseous samples of methane, ethylene, and ethane as a function of pressure at room temperature and also at 193° K for methane. In the pure gases T1 is proportional to density, p, at low densities indicating that intramolecular interactions couple the spin systems to the lattice, as is the case in hydrogen gas. T1/p at low densities gives information on the mean square angle through which the molecules are rotated per collision. Relaxation due to paramagnetic O2 is observed at higher densities when oxygen gas is added as an impurity. The relaxation probability per collision with an oxygen molecule is about 5 times larger for the ethylene–oxygen system than for the other two systems studied. This anomaly is discussed in terms of the theory of Oppenheim and Bloom. It is shown that a study of the temperature dependence of T1 due to O2 impurities provides a new way of obtaining detailed information on the Lennard–Jones parameters for the interaction between O2 and the solvent molecules.