Abstract
A RECENT communication by Bayliss1, commenting upon the spectroscopic evidence for specific, 'chemical' interaction between iodine and benzene obtained by us2, quite properly includes the remark that such spectroscopic evidence should be "interpreted with caution", and he advanced a formula for the shift of the ultra-violet absorption band of iodine toward the red in terms of its polarizability, dipole-strength, and the refractive index of the solvent. We ourselves, at the outset of our investigation, were prepared to find the influence of the solvent to be general or physical rather than specific; but the evidence we obtained later3 has all been in favour of a definite 1 : 1 molecular complex. Excellent constancy was obtained for the constant of the equilibrium, I2 + A⇄I2.A in a 'violet' (neutral) solvent, where A denotes an aromatic hydrocarbon. Moreover, the interaction is stronger in the case of the more basic mesitylene than in benzene, whereas, according to the formula of Bayliss, it should be weaker.
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References
Bayliss, N. S., Nature, 163, 764 (1949).
Benesi, H. A., and Hildebrand, J. H., J. Amer. Chem. Soc., 70, 283 (1948).
J. Amer. Chem. Soc., 71, 2703 (1949).
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HILDEBRAND, J., BENESI, H. Interaction of Iodine with Aromatic Hydrocarbons. Nature 164, 963 (1949). https://doi.org/10.1038/164963b0
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DOI: https://doi.org/10.1038/164963b0
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