Abstract
Ultraviolet absorption spectra of 18 aldehyde azines, derived from two kinds of aromatic aldehydes, were measured in ethanol. All spectra were separated into their component peaks by the method of peak analysis. Results of peak analyses showed that the substituent at the para position of >C=N-N=CH-C6H5 group does not exert any rational substituent effect expected from their electronic nature. In order to clarify the nature of transition of absorption bands, theoretical transition energies of all compounds were calculated by the ASMO-SCF-LCAO -CI-MO method. The reasonable agreement between the experimental and theoretical transition energies of each compound indicate that almost all of component peaks are assignable to π-π* transition.
