Abstract
The influence of the substituents on the characteristic infrared absorption frequencies and the wavelength of the absorption band in the visible region of o-substituted 2 [β-n-amyl-styryl] -1-benzopyrylium perchlorates and 3[β-n-amyl-1-naphthylvinyl]naphtho[2.1-b]pyrylium perchlorates has been investigated. The observed structural changes have been discussed as a function of the mesomeric effect of the substituents.

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