Fullerides structure

Margadonna S, Iwasa Y, Takenobu T, Prassides K (2004) Structural and Electronic Properties of Selected Fulleride Salts 109 127-164 Maseras F, see Ujaque G (2004) 112 117-149 Mattson WD, see Rice BM (2007) 125 153-194... 

Saito S, Umemoto K, Miyake T (2004) Electronic Structure and Energetics of Fullerites, Fullerides, and Fullerene Polymers 109 41-57 Sakata M, see TakataM (2004) 109 59-84... 

X-ray structures of CgQ crystals often show disorder in the arrangement of the CgQ-anions. The first crystallographically ordered structure of a discrete fulleride was found in the dianionic salt [PPN ]2[Cgo ] [73], The first example of a highly ordered monoanion was [Ni(C5Me5)2 ][Cgo ]CS2, which was prepared by chemical reduction with decamethylnickelocene [74],... 

The formation of crystalline fulleride salts at the electrode occurs when less polar solvents and bulky cations are used for the electrosynthesis. The first fulleride salt was synthesized by Wudl by bulk electrolysis of in o-dichlorobenzene with tetraphenylphosphonium chloride as supporting electrolyte [39, 80]. This black microcrystalline material with the composition (Ph4P )3(Cgg )(Cr)2 exhibits an ESR line with a g-value of 1.9991 and a line width of 45 G at room temperature. Single crystals of the slightly different salts (Ph4P )2(Cgg )(Cr) and (Ph4P )2(C50 )(Br ) could be obtained by electrocrystallization and their crystal structure was determined [82, 83]. Magnetic measurements showed the presence of unpaired spins. 

Fullerene, black and shiny like graphite, is the subject of active current research because of its interesting electronic properties. When allowed to react with rubidium metal, a superconducting material called rubidium fulleride, Rb3C6o, is formed. (We ll discuss superconductors in more detail in Section 21.6.) Carbon nanotubes are being studied for use as fibers in the structural composites used to make golf clubs, bicycle frames, boats, and airplanes. On a mass basis, nanotubes are up to ten times as strong as steel. 

Electronic Structure and Energetics of Fullerites, Fullerides, and Fullerene Polymers... 

The simple charge transfer from K to C60 observed in the fee K3C60 is not always the case in potassium fullerides. Similar comparison between the LDA band structure of the bcc K6C60 fulleride and that of the hypothetical bcc pristine solid... 

As has been discussed in this article, C60 fullerene has shown its rich cohesive properties in various environments. It can form a van der Waals solid in the pristine phase and in other compound materials with various molecules. In fullerides, i.e., the compounds with metallic elements, valence electrons of metal atoms transfer to C60 partly or almost completely, depending on the lattice geometries and electronic properties of the metallic elements. So fullerides are ionic solids. Interestingly, these ionic fullerides often possess metallic electronic structure and show superconductivity. The importance of the superconductivity of C60 fullerides is not only in its relatively high Tc values but also in its wide... 

Structural and Electronic Properties of Selected Fulleride Salts... 

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