J. Phys. Chem. 1992,96, 3571-3573
3571
Mass Spectroscopic and ESR Characterization of Soluble Yttrium-Containing Metaiiofuiierenes YCs2and Y2CS2 Hisanori Shinohara,* Hiroyasu Sato, Yahachi Saito, Department of Chemistry for Materials and Department of Electrical Engineering, Mi'e University, Tsu 51 4, Japan
Masato Ohkohchi, and Yoshinori Ando Department of Physics, Meijo University, Nagoya 468, Japan (Received: February 14, 1992)
Solvent soluble, yttrium-containing fullerenes are extracted from yttrium/carbon soot produced by the carbon-arc fullerene generation method. An yttrium-graphitecomposite yields solvent extractable molecules such as YCSzand YZCa2as evidenced by a laser desorption time-of-flight (LD-TOF) mass spectroscopic analysis of the extracts. This is consistent with the very recent results by Smalley et al. where YCB2and Y2CB2are prepared by laser vaporization of yttrium-graphite rods. The present extracts are souble by both toluene and carbon disulfide, but the solubility is much higher in CS2than toluene. LD-TOF mass spectra also show the presence of a series of peaks due to the dimetallofullerenes Y2Ch (2n = 84; 90 I2n 5 140). The metallofullerenes YC, and YCT0are not observed in the mildest possible LD conditions under which YCSzand the dimetallofullerenes Y2CS2and Y2Ch are readily observed. ESR spectral results are also reported for the present yttrium-Wlerene complexes and indicate the charge separation state of Y3+C8Z3-as has been found for La3+C82-by Johnson et al.
Introduction Immediately after the first report on the finding of the exceptionally stable C,,I Heath et al. reported the magic number feature corresponding to a lanthanum
