The He(Iα) Photoelectron Spectra of Substituted 1,2‐Dithietes

Abstract
The He(Iα) photoelectron (PE.) spectra of a series of substituted 1,2‐dithietes have been recorded and assigned with respect to the orbital sequence derived from an STO‐3G model calculation and by correlation with the PE. spectra of related compounds. The results provide additional support for the presence of a closed, four‐membered ring moiety in all the 1,2‐dithietes investigated. In all cases the two highest occupied molecular orbitals are b2(π)= HOMO, a2(π), with exception of 3,4‐bis(trifluoromethyl)‐1,2‐dithiete where the sequence b2(π), a2(π) or a2(π), b2(π) is uncertain.

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