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Invited Article
Phys. Chem. Chem. Phys., 2007, 9, 3067 - 3081, DOI: 10.1039/b704143h
Endohedral clusterfullerenes—playing with cluster and cage sizes
Lothar Dunsch and Shangfeng Yang
The family of endohedral fullerenes was significantly enlarged within the past six years by the clusterfullerenes containing structures like the M2C2 carbides and the M3N nitrides. While the carbide clusters are generated under the standard arc burning conditions according to the stabilisation energy the nitride clusterfullerene type is formed by varying the composition of the cooling gas atmosphere in the arc burning process. The special situation in nitride clusterfullerene synthesis is described in detail and the optimum conditions for the production of nitride clusterfullerenes as the main product in fullerene synthesis are discussed. A review of new nitride clusterfullerenes reported recently is given summarizing the structures, properties and the stability of metal nitride clusterfullerenes. It is shown that all cages with even carbon atoms of C68 and beyond are available as endohedral nitride clusterstructures. Furthermore the nitride clusterfullerenes are that class of endohedral fullerenes forming the largest number of non-IPR structures. Finally the prospects of this evolving field are briefly discussed taking the superior stability of these endohedral clusterfullerenes into account.
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