NMR study of complexation of crown ethers with [60]- and [70]fullerenes

Formation constants (K) of the complexes were determined from the systematic variation of NMR chemical shifts of specific protons of the crown ethers in the presence of [60]fullerene and[70]fullerene. The magnitudes of K indicated that crown ethers dibenzo-24-crown-8 and dibenzo-30-crown-10 form inclusion complexes with [60]fullerene but not [70] fullerene.