Abstract
THE problem of the symmetry of azulene crystals was first put to me by Dr. H. H. Günthard1 in 1949. He gave me some of the material from which I prepared, by sublimation, extremely pleochroic crystals.
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References
Günthard, H. H., Helv. Chim. Acta, 38, 1918 (1955).
Robertson, J. M., and Shearer, H. M. M., Nature, 177, 885 (1956).
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BERNAL, J. Symmetry of Azulene Crystals. Nature 178, 40 (1956). https://doi.org/10.1038/178040a0
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DOI: https://doi.org/10.1038/178040a0
