effect of substituent on the ultra-violet absorption spectra of some sultam-compounds and their correlation with hammett equation

ABSTRACT

The ultra-violet absorption spectra of some saturated sultam rings five or six membered exhibit a maximum absorption b and at 204-211 mm assinged for the vibrational structure of the sultamyl group [n-sigma* transition], in addition to another b and at 230-233 nm assigned for n-pi* transition. Sultamyl group whether five or six membered ring causes bathochromic shift for b and II of benzene ring and their substituent and also for n-pi* transition. Hypsochromic shift for n-pi* transition takes place if the obsorption spectra of some sultam compounds compared with the absorption spectra of benzophenone. Quantitative treatment of Hammett equation on the displacement of b and s is verified exhibiting a linear correlation between the displacement of b and delta lambda and delta sigma. Another linear correlation between the transition energy ET and lambda is also obtained