On the validity of the constants of ionic substituents. Substituent effects on the cyano stretching frequencies and intensities of trans-α-phenyl-β-arylacrylonitriles
Fourier-transform IR frequencies υ(CN) and integrated intensities A(CN) of the cyano groups of a series of trans-α-phenyl-β-arylacrylonitriles (51 compounds) have been measured.Both υ(CN) and the square roots of A(C) of the neutral m- and p-su