Abstract
Investigations of infrared spectra of single crystals of the complex of fullerene C 60 with dianthracene (DAN) and C 60 grown from CS 2 solution (clathrate) versus temperature, between 4 and ca. 430 K, have been performed. A phase transition for the complex and the clathrate accompanied by a splitting of the F 1u(4) band into at least two components was detected at temperatures higher than 260 K. The line splitting was attributed to C 60 symmetry lowering as a result of suppression of its rotation. Phase transitions at 80, 160 and 305 K have been observed for DAN C 60 (C 6H 6) 3; the nature of the transitions has been suggested.
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