Abstract
STRONTIUM soaps of even-n fatty acids from caproic to stearic were examined by X-rays ; they exhibit several crystallographic forms. Form A is obtained by precipitation from an aqueous solution of a sodium soap ; the long spacings follow a law, d = 5·879 + 2·475 N, where N is the number of carbon atoms in the corresponding fatty acid. Form B follows a law, d = 3·95 + 2·447 N ; it can generally be obtained by heating A. The forms show a certain amount of variability of their powder patterns, the causes of which are not yet known. The increment of their long spacings indicates that in both forms the hydrocarbon-chain axes are perpendicular or nearly perpendicular to the ionic sheet planes ; they differ in the structure of the ionic sheet or arrangement of the CH3 end-groups rather than in their angle of tilt. Strontium caproate and one sample of myristate gave patterns indicating the existence of further forms.
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MORLEY, W., VAND, V. Crystal Structure of Strontium Laurate. Nature 163, 285 (1949). https://doi.org/10.1038/163285a0
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DOI: https://doi.org/10.1038/163285a0
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