Abstract
SOME time ago, on the suggestion of Prof. A. R. Todd, calycanine was examined by X-ray methods1,2 in order to decide whether a constitution originally suggested by Barger, Madinaveitia and Strouli3 for a molecule C16H10N2 is in harmony with the crystallographic symmetry and the unit cell dimensions. That investigation established the approximate dimensions of a monoclinic unit cell as a = 13.7 A., b = 4.45 A., c = 9.7 A., Î = 107°, and showed that the space group is P21/a — C2h5, provided that a few very weak reflexions are neglected. If these reflexions are taken into account, it was suggested that the above cell should be regarded as a pseudo-cell, the true unit cell having a doubled c-axis, 2 × 9.7 A. Fairly detailed suggestions were advanced as to the probable crystal structure, but the chemical synthesis which Prof. A. R. Todd intended to carry out has not been completed because of the War.
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References
Hargreaves, A., thesis for Ph.D. degree, University of Manchester (1940).
Hargreaves, A., and Tavlor, W. H., J. Sci. Instr., 18, 138 (1941).
Barger, G., Madinaveitia, J., and Streuli, P., J. Chem. Soc., 510 (1939).
Manske, R. H. F., and Marion, L., see Craig, Ann. Rev. Biochem., 11, 572 (1942).
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HARGREAVES, A. Constitution of Calycanine. Nature 152, 600 (1943). https://doi.org/10.1038/152600a0
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DOI: https://doi.org/10.1038/152600a0
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