Optical spectra and some aspects of intra- and intermolecular interactions in organic compounds of phosphorus and arsenic

Abstract

Methods of optical ( IR, Raman and UV) spectroscopy have proved to be very informative with regard to the important problems of electronic effects caused by atoms of the third- and fourth-row elements (phosphorus and arsenic in particular) of the Periodic Table, as well as to problems of intermolecular interactions of atomic groups containing these atoms. A few problems have been considered where methods of optical spectroscopy appeared to be of value, such as participation of groups with tetracoordinated phosphorus or arsenic atoms in conjugation, some evidence that lone electron pairs of P III and As III atoms are involved in the same process, probably electron-accepting rather than electron-donating properties of phosphorus- and arsenic-containing groups, whatever the valency state of the hetero-atoms, a correlation between structure and tendency for molecules of organophosphorus and organoarsenic compounds to associate by means of hydrogen bonds, dipole-dipole interactions, etc.