Fullerene C70 as a Nanoflask that Reveals the Chemical Reactivity of Atomic Nitrogen

To investigate the intrinsic reactivity of atomic nitrogen, which had previously been accomplished only by examining its decay in the gas phase using special equipment, a nitrogen atom was inserted into a series of molecule-encapsulating C₆₀ and C₇₀ fullerenes. Among the studied endofullerenes, H₂@C₇₀ was able to encapsulate an additional nitrogen atom within the fullerene cage under radiofrequency plasma conditions. The product was analyzed by ESR spectroscopy and mass spectrometry in solution, which revealed that the nitrogen atom with a quartet ground state does not react but weakly interact with the H₂ molecule, thus demonstrating the utility of such fullerenes as “nanoflasks”.     

C_(60)/C_(70)及其衍生物(C_(60)Cl_n/C_(70)Cl_n)在丁二烯阴离子聚合中的偶联作用

Fullerene(富勒烯)独特的结构和性质吸引了高分子界广泛的关注.迄今,已通过和自由基共聚[1]、活性自由基聚合[2]、阳离子聚合[3]、阴离子聚合[4～8]以及配位聚合[9～13]等诸多方法相结合制备出了种类繁多的富勒烯高分子衍生物.不仅如此,富勒烯家族的重要分支--富勒烯卤化物,其独特的分子结构和具有的新性质也甚引起人们的重视[14,15].     

New Ruthenium Complexes of Fullerene C60＆C70

The new complexes[Ru(NO)(PPh3)]2(η^2-Cm)(m=60 1 or 70 2)have been prepared by heating a solution of C60(or C70)with[Ru(NO)2(PPh3)2]in toluene.They have been characterized by elemental analysis,IR,UV/VIS,XPS,^13C and ^13P NMR spectroscopy.The photovaltaic effect for the new compounds has been studied.     

Microwave-assisted extraction of C60 and C70 from fullerene soot

Microwave-assisted extraction (MAE) was examined as an alternative to the traditional Soxhlet method of extracting C₆₀ and C₇₀ from fullerene soot. MAE of 0.20 g of fullerene soot with 95:5 toluene–acetonitrile yielded greater than 7.8 mg of C₆₀ and greater than 0.54 mg of C₇₀ in 4 min with no further increase in yield after 30 min of irradiation. By comparison, exhaustive Soxhlet extraction of the same size sample with the same solvent yielded 7.1 mg of C₆₀ and 0.58 mg of C₇₀ in 340 min. Reextraction by MAE of soot initially extracted by Soxhlet increased the yield of Soxhlet alone. Although MAE was limited to less than 0.5-g sample per extraction vessel, multiple samples were extracted with minimal increased extraction time and no reduction in the amount of material recovered.     

Theoretical investigation of the heterofullerenes C59N and C69N and their dimers

The heterofullerenes C₅₉N and C₆₉N and their dimers are examined by the intermediate neglect of differential overlap (INDO/1 and INDO/S) models. The results confirm the stability of the (C₅₉N)₂ and (C₆₉)₂ (C_2h) isomers with a 6–6 closure fusion link between the two monomers. The nearest neighbor C of nitrogen, at the hexagon–hexagon fusion in C₅₉N and in C₆₉N where the N replaces one C in the pentagon of the fullerene has the largest electronic spin density, and this is where the two radicals of C₅₉N or C₆₉N link to form dimers. Also the dimers readily dissociate to free radical monomers to react regioselectively with other reagents. The electronic spectra of the radicals are similar to those of the dimers, which suggest essentially identical electronic structures. © 2000 John Wiley & Sons, Inc. Int J Quant Chem 78: 422–436, 2000     

Synthesis of the C59N+ carbocation. A monomeric azafullerene isoelectronic to C60

A heterofullerene isoelectronic to C60 is reported. The azafullerenium cation C59N+ can be isolated in good yield as a carborane salt via the two-electron oxidation of the C-C bond of (C59N)2 dimer. [C59N][Ag(CB11H6Cl6)2] has been characterized by electronic, IR, Raman, and 13C NMR spectroscopies, MALDI spectrometry, DFT calculations, and X-ray crystallography.