Intramolecular Interactions of Phosphor-Containing Groups with an Aromatic Fragment in Different Conformations

Geometrical and electronic structure of conformers was studied by optical spectroscopy and quantum chemistry methods. The interaction mechanism of phosphor-containing groups with an aromatic fragment in YC 6 H 4 PX 2 (Y = H, Cl, Me, OMe, NMe 2 , C(O)OR; × = Alk, OAlk, NAlk 2 , Cl) and YC 6 H 4 P(Z)X 2 (Y = H, C1, Me, OMe, NMe 2 ; × = Alk, OAlk, NAlk 2 , F, C1; Z = O, S) compounds is discussed. In case of bisector conformation (A), where the benzene ring plane coincides with a XPX-angle bisectrix, ll-acceptor action of phosphorus-containing groups increases with X varying in a series: Alk