Abstract
WE have made a systematic examination1 of the absorption spectra of cobaltammines which undergo isotopic exchange of hydrogen atoms in constituent NH3 or NH2 radicals, and more especially of those which are mixtures of optical isomers. Cobaltammines almost invariably give rise to two broad absorption bands2 in the visible (I) and near ultraviolet (II) spectrum. Substitution of 2H for 1H produces an effect upon band (I) illustrated in Fig. 1; it is generally more pronounced the larger the number of exchangeable hydrogen atoms in the molecular ion. Absorption band (II) is scarcely affected, but differences occur in the farther ultra-violet. The full line is representative of protium-containing cobaltammines, the broken line of corresponding deuterium compounds.
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References
Hamblin, F. T., thesis (1935). Poynton, N. H., thesis (1936).
Mead, Trans. Faraday Soc., 30, 1052 (1934).
J. Chim. Phys., 33, 78 (1936); Bull. Soc. Chim., 3, 476 (1936).
NATURE, 39, 109 and 508 (1937).
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JOHNSON, C., POYNTON, N. Absorption Spectra, Optical Activity and Isotopic Exchange. Nature 139, 842–843 (1937). https://doi.org/10.1038/139842b0
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DOI: https://doi.org/10.1038/139842b0
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