Fullerene homologues

Table 13.1 reports the solubihty parameters of a series of fullerenes. Higher fullerene homologues up to C90 are predicted to have a solubility parameter <5t=<5d=20MPa1/2, thus, not far from the value calculated for the most common fullerenes CL and CL. 

Our synthetic work on [78]fullerene [15] started from a mixture of and D3-C78 [16]. Whereas the former is one out of two known achiral f 2v -symmetrical isomers of C7g,the latter is the second inherently chiral homologue of buck-minsterfullerene [16, 20, 22]. C2V-C78 is the first fullerene containing y-type bonds, one of which is situated at the intersection of the carbon cage with the C2-axis and the two mirror planes (Fig. 12). Among the total of 18 different... 

Fullerenes smaller than Cgo contain adjacent pentagons and the curvature of the carbon surface is much higher than one of their large homologues. As a result the Ji-conjugation in the small fullerenes is curved and weakened, especially in the pentagon fusion sites. The unusual stability of C32 has been ascribed to its spherical aromaticity arising from its completely fiUed 32 jt-electron valence shell [2],... 

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