XII. The crystal structures of some heterocyclic organic compounds of analogous constitution.—Part III. Phenazine and diphenylene dioxide

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Abstract
An account is given of crystallographic, optical, and X-ray measurements on phenazine and diphenylene dioxide. It is shown that the results for these substances imply that the phenazine molecule is plane, and are consistent with the molecule of diphenylene dioxide being plane. Our thanks are due to Dr. N. M. Cullinane, of the Chemistry Department of this College, who prepared the diphenylene dioxide; to Dr. E. E. Turner for specimens of phenazine; to Dr. E.G. Cox for access to some unpublished photographs of diphenylene dioxide; to Dr. Kathleen Lonsdale for unpublished magnetic measurements and for many valuable discussions; and to Professor R. T. Dunbar for his interest throughout the whole of the present work. One of us (G. W.) acknowledges the receipt of a University of Wales Postgraduate Studentship. A table summarizing the principal measurements on the eight crystals discussed in this series of papers is given above.