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b) paper VI: data that the complexes of this type represent interesting examples of coordination compounds with extensive ground-state ir-electron delocalization.

In order to study the inversion of a secondary amine in which the hydrogen is replaced by a deuterium, II was prepared by equilibration of I in D2Q, followed by salting out with NaOD, distillation from solid NaOD, and subsequent storage over solid NaOD. Compound II showed the same n.m.r. spectrum at room temperature (in CCh) as I, but the coalescence of the two resonance lines occurred only at 68°. Using the same two alternative methods of calculation as in the case of I, the activation energy of inversion was found 14.3 (from Figure 2, II) and 15.0 kcal./mole, respectively.These results are in agreement with the expected greater inertia of an N-D bond in its vibration through the plane of the ring, due to the greater mass of the deuterium.