ETHENETHIOL AND 1-PROPENE-1-THIOL - A PHOTOELECTRON SPECTROSCOPIC STUDY

Ethenethiol and 1-propene-1-thiol were produced through the thermolysi s of thiirane and 2-methylthiirane, respectively, under reduced pressu re in a flow system. The photoelectron spectra of the olefin thiols ar e characterised by the presence of a sharp first band which is well se parated from the other bands by more than 2 eV. The spectra are discus sed with the aid of AM1 and ab initio SCF MO calculations, and a diagr am which correlates the binding energies of the first three orbitals, viz. pi(CCS), pi(CCS) and sigma(CS), with those of the corresponding orbitals of related molecules.