Abstract
THE crystals of 2-(2′,4′-dinitrobenzyl)-pyridine (I), which are colourless when kept in the dark, turn blue when exposed to light1. Hardwick, Mosher and Passailaigue1 by using a cryoscopic technique have demonstrated that the change in colour is not confined to the crystals but occurs in dilute solutions as well. A similar change in colour has also been observed with 4-(2′,4′-dinitrobenzyl)-pyridine (II)2.
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References
Hardwick, R., Mosher, H. S., and Passailaigue, P., Trans. Farad. Soc., 56, 44 (1960).
Mosher, H. S., Souers, C., and Hardwick, R., J. Chem. Phys., 32, 1888 (1960).
Sousa, J. A., and Weinstein, J., J. Org. Chem. (in the press).
Wettermark, G., J. Amer. Chem. Soc. (in the press).
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WETTERMARK, G. Photochromism of o-Nitrotoluenes. Nature 194, 677 (1962). https://doi.org/10.1038/194677a0
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DOI: https://doi.org/10.1038/194677a0
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