Dynamics of the Metal Ion in M@C82 (M=La, Y) Metallofullerenes Studied by Temperature Effects in Electron Spin Resonance Spectra

Abstract ESR spectra of M@C82 (M=La, Y) metallofullerene solutions show the monotonic decrease of the metal ion hyperfine coupling constant between −70 and +260°C and changes in the lineshape of Y@C82 signals above 80°C, which were attributed to anharmonic metal-to-cage vibrations and to the motion of Y between different chemisorption sites in a C82 cage, respectively.

[1]  Hisanori Shinohara,et al.  Determination of the cage structure of Sc@C82 by synchrotron powder diffraction , 1998 .

[2]  A. Curioni,et al.  Ab initio approach to the structure and dynamics of metallofullerenes , 1998 .

[3]  S. Lebedkin,et al.  A spectroscopic study of M@C82 metallofullerenes: Raman, far-infrared, and neutron scattering results , 1998 .

[4]  Shigeru Nagase,et al.  Structures and electronic states of M@C82 (M=Sc, Y, La and lanthanides) , 1998 .

[5]  S. Roth,et al.  Fullerenes and fullerene nanostructures : proceedings of the International Winterschool on Electronic Properties of Novel Materials, Kichberg, Tyrol, Austria, 2-9 March 1996 , 1996 .

[6]  Andreoni,et al.  Freedom and Constraints of a Metal Atom Encapsulated in Fullerene Cages. , 1996, Physical review letters.

[7]  Makoto Ohno,et al.  Confirmation by X-ray diffraction of the endohedral nature of the metallofullerene Y@C82 , 1995, Nature.

[8]  S. Kawata,et al.  Fourier transform EPR studies of metallofullerene (La@C82) in CS2 solution , 1995 .

[9]  Y. Maruyama,et al.  Isolation and Characterization of an ESR-Active La@C82 Isomer , 1994 .

[10]  Weaver,et al.  Electronic and geometric structure of La C82 and C82: Theory and experiment. , 1994, Physical review. B, Condensed matter.

[11]  M. S. de Vries,et al.  Atoms in carbon cages: the structure and properties of endohedral fullerenes , 1993, Nature.

[12]  Y. Saito,et al.  High yield synthesis of lanthanofullerenes via lanthanum carbide , 1993 .

[13]  R. Smalley,et al.  XPS probes of carbon-caged metals , 1992 .

[14]  P. Fowler,et al.  Structural proposals for endohedral metal—fullerene complexes , 1991 .

[15]  W. A. WATERS,et al.  Electron Spin Resonance , 1966, Nature.

[16]  N. Hirota,et al.  Electronic Interaction in Ketyl Radicals , 1964 .

[17]  S. Weissman,et al.  Association Between Sodium and Naphthalenide Ions1 , 1961 .

[18]  G. Seifert,et al.  Electron spin resonance spectra: geometrical and electronic structure of endohedral fullerenes , 1998 .

[19]  James R. Bolton,et al.  Electron Spin Resonance: Elementary Theory and Practical Applications , 1972 .