STRUCTURAL AND MOTIONAL FEATURES OF BENZENE-SOLVATED C-60 AS REVEALEDBY HIGH-RESOLUTION SOLID-STATE NMR

Structural and motional features of C-60 - 4C(6)H(6) solvate has been investigated by high-resolution C-13 solid-state NMR spectroscopy. C-1 3 line shape analysis of the cross-polarization spectrum for the stati c sample at 293 K shows an unusual motional restriction of benzene mol ecules in this solvate. The existence of highly anisotropic motion of benzene fraction is visualized also by the detection of important home and heteronuclear dipolar interactions. C-13 magic-angle spinning spe ctra reveal a complex character of the C-60 NMR signal composed of thr ee components with slightly different isotropic chemical shifts indica ting the existence of magnetically nonequivalent positions or sites. ( C) 1998 Elsevier Science Ltd. All rights reserved.