Abstract
IN a paper published in the Proceedings of the Royal Society (vol. A, 125, p. 542 1929) on the structure of naphthalene and anthracene, J. M. Robertson comes to the conclusion that “the scattering centres lie nearer the ac planes than the bc planes, but no simple structure with a plane of symmetry parallel to the ac plane is possible”, and that the scattering centres lie along a chain structure similar to hydrocarbons. On the other hand, the structure of hexa-methylbenzene as determined by K. Lonsdale (Proc. Roy. Soc., vol. 123, p. 537; 1929) suggests that the benzene rings in aromatic compounds should in all probability be plane structure. This has further support from the plane hexagonal structure of graphite (Ott, Ann. d. Phys., vol. 85, p. 81; 1928). As regards whether the scattering centres are nearer the ac plane or the bc plane, the optical and magnetic anisotropies which have been measured by S. Bhaga-vantam (Proc. Roy. Soc., vol. A, 124, p. 545; 1929) require that the carbon atoms should lie nearer the bc plane than the ac plane. The structure proposed by Robertson, however, does not explain the intensities of reflection from many of the crystal planes, which he supposes are due to small glancing angles for those particular reflections. But on evaluating the angle factors for the intensities it is seen that such large discrepancies cannot be explained in that manner.
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BANERJEE, K. Atomic Physics and Related Subjects.: Communications to Nature.: Structure of Naphthalene and Anthracene. Nature 125, 456 (1930). https://doi.org/10.1038/125456a0
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DOI: https://doi.org/10.1038/125456a0
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