Higher Fullerenes beyond

For the higher fullerenes beyond C70 only a few examples of adducts with unambiguous structural characterizahon have been reported [2], For example, several Diels-Alder and malonate monoadducts of Dj-Cy have been isolated [10, 36], The addends are bound to a-type bonds of the fullerene framework. Nucleophilic cyclopropanahons of a 3 1 mixture of and D3-C78 with a slight excess of diethyl... 

For origins of fullerene chirality and definitions of configurational description factors fC and fA (f = fullerene, C = clockwise, A = anticlockwise), see C. Thilgen, A. Herrmann, F. Diederich, The Covalent Chemistry of Higher Fullerenes C70 and Beyond , Angew. Chem Int. Ed. Engl. 1997,36,2269-2280. 

C. Thilgen, A. Herrmann and F. Diederich (1997) Angewandte Chemie, International Edition in English, vol. 36, p. 2268 - The covalent chemistry of higher fullerenes C70 and beyond . 

Diederich F and Whetten R L 1992 Beyond Cggi the higher fullerenes Accounts, Chem. Res. 25 119... 

Experimental structural information on the empty fullerenes beyond C92 is very scarce and usually limited to the mixtures of isomers. X-ray crystallographic study of C94(CF3)2o and C96(C2F5)i2 obtained by perfluoroalkylation of the higher fuUerene mixture with subsequent HPLC separation proved formation of C94-C2(61) and G96-Ci(145) isomers in the arc-discharge synthesis (Tamm et al. 2009a), but these data are inconclusive since the actual isomeric composition of the initial fullerene mixture remains unknown. Yet, a lot of calculations were performed for larger fullerenes, and systematic information on the lowest energy isomers is available up to Ciso. 

Example II Fullerene soots as obtained by the Huffman-Kratschmer synthesis [140] can be characterized by positive- as well as negative-ion LDI-MS [135]. Such LDI spectra can exhibit fullerene molecular ion signals well beyond m/z 3000 among these, Ceo and are clearly accentuated (Fig. 11.17). Furthermore, such samples provide experimental carbon-only isotopic patterns over a wide mass range (Chap. 3.2.1). The spectrum below was obtained on a FT-ICR mass spectrometer hence the resolution is 175,000 at m/z 840, i.e., almost by a factor of 1000 higher than on early TOF instruments as used for the discovery of... 

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