Abstract
A LARGE number of deeply coloured chelate compounds is known, the components of which show no, or only weak, absorption in the visible region. Typical examples are the nickel complex of diacetyl dioxime and the ferrous tri-α-α′-dipyridyl and tri-o-phenanthroline ions. As such complexes have been shown to be diamagnetic1, containing thus closed electronic shells on the metal atom, it is highly improbable that the colour of such compounds is due to electronic transitions within the metal atoms. The abnormal colour can thus be only attributed to the co-ordinated molecules2.
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References
See literature references in P. W. Selwood, “Magnetochemistry” (Interscience Pub., New York, 1943).
Recently, Roberts, G. L., and Field, F. M., J. Amer. Chem. Soc., 72, 4222 (1950), interpreted in this way the absorption of the nickel-tri-o-phenanthroline ion between 300 and 350 mµ.
The absorption spectra of this compound have already been reported; see, for example, Yamasaki, R., Chem. Abstr., 35, 1700 (1941); Baxendale, J. H., and George, Philip, Trans. Farad. Soc., 46, 55 (1950).
Baxendale, J. H. (ref. 3).
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KRUMHOLZ, P. Abnormal Colour of Chelate Compounds. Nature 167, 570 (1951). https://doi.org/10.1038/167570a0
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DOI: https://doi.org/10.1038/167570a0
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