Abstract
Absorption spectra of the mixtures of iodine with benzylideneanilines in various concentrations have been measured, and from the optical densities of the solutions the equilibrium constants have been calculated. The equilibrium constants are unexpectedly small. But for methoxy-derivatives and especially for ortho-compound, the equilibrium constants are considerably large. For o-methoxy- and o-chloro-derivatives, the charge-transfer bands appear at the longer wavelengths. These experimental evidences are also adequately explained by the perpendicular structure of benzylideneaniline.

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