Characterization of Ce@C₈₂ and Its Anion

Abstract

Ce@C(82) is isolated by high-performance liquid chromatography (HPLC) and the cage symmetry is determined as C(2)(v)() by measuring the (13)C NMR spectra of its anion. The (13)C NMR peaks of [Ce@C(82)](-) show temperature-dependent shifts ascribed to the f electron remaining on the Ce atom. Both Ce@C(82) and [Ce@C(82)](-) are silent in electron spin resonance spectroscopy (ESR) because of the highly anisotropic g matrix as well as of the fast relaxation process originating from the orbital angular momentum of the f electron. This is the complementary relationship to the observation of the paramagnetic shift in (13)C NMR. [Ce@C(82)](-) has lower stability in air than [La@C(82)](-).

Strong electronic coupling and electron transfer in a Ce2@Ih-C80–H2P electron donor acceptor conjugate

“…This result may suggest close proximity between the endohedral Ce 3+ ions and the porphyrin moiety, through which the individuals can efficiently interact by their magnetic dipoles. [17][18][19] Thus, our NMR results suggest a folded conformation for 2, consistent with that of Ce 2 @C 80 -ZnP. It is likely that the longer spacer of 2-oxy-ethyl butyrate allows a close alignment of the π-electronrich moieties Ce 2 @C 80 and H 2 P. Moreover, DFT-optimization also prompted to a folded conformation for 2 (see Fig.…”

Exchange interactions of spin-active metallofullerenes in solid-state carbon networks

“…22 Ce@ C 82 , therefore, provides a convenient comparison for the spin active Sc@ 82 . We filled SWNTs with Ce@ C 82 to produce peapods and measured the room temperature CW EPR spectrum, shown in Fig.…”

Magnetic Properties and Crystal Structure of Solvent‐Free Sc@C82 Metallofullerene Microcrystals

“…[1] Characteristic structures of various metallofullerenes have been investigated by 13 C NMR [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and X-ray powder diffraction. [14][15][16][17][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] Since the first X-ray structural determination of Y@C 82 , [19] the molecular structures of various monometallofullerenes M@C 82 have been determined by 13 C NMR [5][6][7]13] and X-ray analyses. [21,23,32,33] In particular, Gd@C 82 …”