NEW LANTHANOID METALLOFULLERENES AND THEIR HPLC ELUTION BEHAVIOR

HPLC behaviors of metallofullerenes of 14 lanthanoid elements were stu died by use of radiotracers, and the species of some of the metalloful lerenes were identified by mass spectroscopy. From the HPLC elution be haviors, 14 lanthanoid elements forming metallofullerenes were found t o be grouped into two, namely, Sm, Eu, Tm and Yb as one group and the rest of the elements as another. Some new species of metallofullerenes like La@C-74, and M@C-11 (M=Eu, Tm Yb; n=74, 82, 84, 88, 90, 92, 94) have been identified. The observed retention times of metallofullerene s are discussed in terms of the number of carbon atoms of the cage and from consideration of the electron donor and acceptor relation betwee n the fullerene species and the HPLC stationary phases.