Infrared (500–2000 cm−1) spectra of p-(p-ethoxyphenylazo)phenyl alkanoates (valerate, hexanoate, heptanoate and undecylenate) have been examined in the solid state. An attempt has been made to correlate the variations in the intensities and frequency shifts with the known crystal structures determined by X-ray diffraction methods. The gradual shift towards smaller wavelength in the carbonyl (C=O) stretching frequency and the relative increase in the intensity of the carbonyl frequency as the chainlength increases may be correlated with the increased deviation from planarity of the molecule.
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Rajalakshmi et al. (1980) studied this question.