Abstract
IN a recent communication having the above title, Baertschi, Kuhn and Kuhn1 expressed surprise that substitution of carbon-13 for carbon-12 in the molecules CHCl3, CCl4, CH3OH and C6H6 caused an enhancement of volatility, whereas substitution of chlorine-37 for chlorine-35 in the first two compounds, and of oxygen-18 for oxygen-16 in methanol, had the opposite effect. This led them to suggest that it might be a general rule for isotopic molecules containing a central atom that the molecular variety having the heavier isotope as central atom is more volatile than the isotopic molecule with the lighter central atom.
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References
Baertschi, P., Kuhn, W., and Kuhn, H., Nature, 171, 1018 (1953).
Hinshelwood, C. N., “The Structure of Physical Chemistry”, 142 (Oxford, 1951).
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BRADLEY, D. Fractionation of Isotopes by Distillation of some Organic Substances. Nature 173, 260–261 (1954). https://doi.org/10.1038/173260a0
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DOI: https://doi.org/10.1038/173260a0
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