Abstract
An experimental method for the determination of the relative values of τ1 and τ2 by the nuclear Overhauser effect proposed by Kuhlmann and Baldeschwieler is applied to 1,1-difluoroethylene, where τ1 and τ2 are the correlation times for the change in rotational quantum number and for molecular reorientation, respectively. The proton transition probability WH, the fluorine transition probability between the levels belonging to the same symmetry representation WF(A), and the fluorine transition probability between states of different symmetry WF(B) are obtained by NMR and NMDR experiments in solutions of CF2CH2 in various solvents. The temperature dependence of these transition probabilities measured between −40° and 33°C shows that τ1≪τ2. The ratio of diagonal and off-diagonal components of the spin—rotation interaction tensor is (Cxx2+Cyy2+Czz2)/(Cyz2+Czy2)≃40.The change in anisotropic intermolecular interactions obtained by a change of solvent affects τ1 more than τ2.
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