Abstract
1. The photoelectronic spectra of a number of organophosphorus compounds of the type of WPXYZ were obtained and interpreted for the first time. 2. The upper orbital is primarily localized on the pπ-orbitals of the W atom, participates in the bonding of WP, and has little conjugation with the orbitals of the unshared pairs of the substituents. Exceptions are nitrogen-containing substituents. 3. Series of atoms W with respect to decreasing influence on the ionization potentials of the UEP of the substituents XYZ were established: for nonnitrogen-containing substituents OP > SP > P, and for nitrogen-containing substituents SP > OP > P.
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