INFRARED TRANSMISSION STUDY OF LANTHANIDE FULLERIDES SMXC60 PREPARED BY METAL VAPOR SYNTHESIS

Lanthanide fulleride SmxC60 films were prepared by metal vapor synthes is and the valence state of the C-60 cage in the films was investigate d by infrared transmission spectroscopy. Three films with different do ping contents of Sm showed red-shift frequencies of F-1u(4) at 1347, 1 362 and 1392 (1411) cm(-1), respectively, indicating that the major ph ase with corresponding valence state n approximate to-5, -3 and -1 mig ht exist in the films. The other major additional feature of activated pentagonal pinch mode A(g)(2) was observed at 1445 or 1448 cm(-1) in the films, which suggested that the Sm atoms might bond to the five-me mbered ring of the C-60 cage and ferrocene-like SmxC60 complexes might be formed.