~1H,~(19)F,and ~(31)P PGSE NMR Diffusion Studies on Chiral Organic Salts:Ion Pairing and the Dependence of a Diffusion Value on Diastereomeric Structure

摘要

~1H,~(19)F and ~(31)P pulsed field gradient spin-echo (PGSE) diffusion studies on chiral organic salts that contain hexacoordinate phosphate anions,namely tris(-tetrachlorobenzenediolato)phosphate(v) (TRISPHAT) and bis(tetrachlorobenze-nediolato)mono([l,1']binaphthalenyl-2,2'diolato)-phosphate(v) (BINPHAT),are reported.The first example of the dependence of a diffusion value on diastereo-meric structure is presented.Marked solvent and concentration effects on the diffusion constants (D) of these salts are noted and the question of ion pairing is discussed.