Study of molecular complex formation between [60]fullerene and two series of donors by the NMR method

Formation of molecular complexes between [60]fullerene and (i) a series of aromatic hydrocarbons, namely, anthracene, acenaphthene, phenanthrene, pyrene, durene, pentamethylbenzene, and hexamethylbenzene, and (ii) a series of pyridines, namely, pyridine, 2-picoline, 3-picoline, 4-picoline, 2,6-lutidine, and 2,4,6-collidine has been studied in CCl4 medium by NMR method. [60]Fullerene has been shown to form 1:1 molecular adducts with the above series of compounds. Formation constants (K) of the above complexes have been determined from the systematic variation of NMR chemical shifts of specific protons of the donors in the presence of C-60. The K values of [60]fullerene complexes with pyridine, 3-picoline, and 4-picoline yield good estimates of the Hammett constant, rho, for the complexation reaction.