NMR spectrometric study of molecular complex formation of [60]- and [70]fullerenes with a number of phosphine oxides

Abstract

Molecular complex formation between [60]- and [70]fullerenes with a series of phosphine oxides, namely, tri- n-octyl phosphine oxide, triphenyl phosphine oxide and tri- n-butyl phosphine oxide has been studied in CCl 4 medium by NMR spectrometric method. Both [60]- and [70]fullerenes have been shown to form 1:1 adducts with the above series of phosphine oxides. Formation constants ( K) for all the complexes have been determined from the systematic variation of NMR chemical shifts of specific protons of the donors in presence of [60]- and [70]fullerenes. Trends in the values of K suggest that [70]fullerene binds stronger with the phosphine oxides relative to [60]fullerene.