UV SPECTRA OF VINYL CHALCOGENIDES - CORRELATION WITH THE PHOTOELECTRON-SPECTRA

The electron absorption spectra of alkylvinyl chalcogenides (CH2 = CHE Alk, E = S, Se, Te) were analyzed with consideration of the photoelect ron spectroscopic data. The following sequence of electronic transitio ns was found in their UV spectra: (S) : pi --> sigma < pi --> pi* < p i --> np approximately pi --> sigma, (Se) : pi --> sigma* < pi --> pi approximately pi --> ns < pi --> sigma* < pi --> np, (Te) : pi --> s igma < pi --> sigma* < pi --> ns < pi --> pi* < pi --> np.