108739-25-9Relevant articles and documents
Phonons and electron-phonon interaction in halogen-fullerene compounds
Limonov,Kitaev,Chugreev,Smirnov,Grushko,Kolesnik,Kolesnik
, p. 7586 - 7594 (1998)
We have investigated the optical spectra of different halogen-fullerene compounds: C60I4-x, C70I2, C60Br24, C60Cl24, and C70Cl17. Two types of carbon-halogen bonding have been established: (a) C60I4-x and C70I2 compounds are formed by a C60 or C70 molecule sublattice and an I2 molecule sublattice that weakly interact via van der Waals forces; (b) C60Br24, C60Cl24, and C70C117 compounds are characterized by covalent bonds between C and Br/Cl atoms. We have studied in detail the resonance effects in C60Cl24 using the methods of Raman scattering, infrared absorption, and absorption in the visible region. The effect originates from the interactions between the phonon subsystem and the electron band at 2.33 eV and manifests itself in a resonant enhancement of the Raman line intensities and in the repetition of the phonon and the luminescence spectra shifted by the frequency of Raman-active phonon at 1508 cm-1. The group-theory analysis of phonon symmetries in rigid and nonrigid C60Br24 and C60Cl24 crystals has been performed.
Kinetics of the Diels-Alder reaction between C60 and acenes
Sarova, Ginka H.,Berberan-Santos, Mário N.
, p. 402 - 407 (2004)
The kinetics of the Diels-Alder reactions between C60 and the linear acenes anthracene and tetracene are studied in toluene, in the temperature range 22-63 °C. It is observed that tetracene reacts much more readily with C60 than does
Heat capacity measurements and thermodynamic studies of the new compound C60
Atake, T.,Tanaka, T.,Kawaji, H.,Kikuchi, K.,Saito, K.,et al.
, (1991)
Heat capacity of the new compound C60 was measured by using a laboratory-made adiabatic calorimeter between liquid helium temperature and room temperature. A phase transition phenomenon was observed as a large heat capacity anomaly extending from 180 to 260 K. The fact that the anomaly has two peaks at 250 and 255 K indicates a complicated mechanism of the phase transition and/or some effects of purity, multi-phases in the sample. The values of enthalpy and entropy of transition were estimated as 6.7 kJmol-1 and 28 JK-1 mol-1, respectively. The normal portion of the heat capacity curve as a whole is very similar to that of graphite. In the lowest temperature region, however, the heat capacity of C60 is much larger than that of graphite. Molecular motion in the crystal of C60 is discussed concerning with the lattice vibrations.
Hydrogen adsorption and phase transitions in fullerite
Ye,Ahn,Fultz,Vajo,Zinck
, p. 2171 - 2173 (2000)
Hydrogen desorption and adsorption properties of the fullerene materials C60, C70, and fullerite (a mixture of C60 and C70) were measured volumetrically using a Sievert's apparatus. Over several cycles of isotherm measurements at 77 K, the hydrogen storage capacities of one of the fullerite samples increased from an initial value of 0.4 wt% for the first cycle to a capacity of 4.4 wt% for the fourth cycle. Correspondingly, the surface area of this sample increased from 0.9 to 11 m2/g, and there were changes in its x-ray powder diffraction pattern. In comparison, two other fullerite samples, prepared by a different procedure showed no such behavior. Pure C60 and pure C70 were also cycled and exhibited small and constant capacities of 0.7 and 0.33 wt%, respectively, as a function of number of cycles. The enhanced storage capacity of fullerite material is tentatively attributed to the presence of C60 oxide.
Syntheses and EELS characterization of water-soluble multi-hydroxyl Gd@C 82 fullerenols
Kato, Haruhito,Suenaga, Kazutomo,Mikawa, Masahito,Okumura, Masafumi,Miwa, Naoto,Yashiro, Arihiro,Fujimura, Hidefumi,Mizuno, Akiko,Nishida, Yoshihiro,Kobayashi, Kazukiyo,Shinohara, Hisanori
, p. 255 - 259 (2000)
Various water-soluble multi-hydroxyl fullerenes (fullerenols), C60(OH)n, C70(OH)n and C84(OH)n, and a Gd metallo-fullerenols, Gd@C82(OH)n have been synthesized by the Kitazawa method. Elementary chemical analyses indicate that all of these fullerenols have 30-40 hydroxyl groups and 11-15 coordinated water molecules via hydrogen bonds. Electron energy loss spectroscopy (EELS) on Gd@C82 fullerenols shows that the π* peak area in the C K-edge spectra decreases on going from intact Gd@C82 metallofullerene to Gd@C82 fullerenols, indicating an increase in sp3 character of the fullerenols. Furthermore, Gd M4,5-edge EELS spectra show that the encapsulated Gd atom has a trivalent Gd3+ state.
Synthesis, separation, and characterization of fullerenes and their chlorinated fragments in the glow discharge reaction of chloroform
Xie, Su-Yuan,Huang, Rong-Bin,Deng, Shun-Liu,Yu, La-Jia,Zheng, Lan-Sun
, p. 1734 - 1738 (2001)
Fullerenes and various chlorinated carbon clusters were synthesized via the glow discharge reaction using chloroform vapor as starting reactant. High-performance liquid chromatography combined with ultraviolet spectrometry and mass spectrometry (HPLC-UV-M
Additions of azomethine ylides to fullerene C60 assisted by a removable anchor
Da Ros, Tatiana,Prato, Maurizio,Lucchini, Vittorio
, p. 4289 - 4297 (2000)
The addition of nitrile oxides to [60]fullerene, leading to isoxazolinofullerenes, can be reversed using reducing agents such as Mo(CO)6 or DIBALH. Thus, this reaction can be used; in principle, for protection/deprotection of [60]fullerene or f
The thermodynamic properties of bis(η6-o-xylene)chromium(I) fulleride over the temperature range from T → 0 to 340 K
Markin,Ruchenin,Smirnova,Markin,Shevelev, Yu. A.,Kuropatov,Domrachev
, p. 1289 - 1294 (2009)
The temperature dependence of the heat capacity of bis(η6-o- xylene)chromium(I) fulleride, [(η6-(o-xylene)) 2Cr]+?[C60]?-, over the temperature range 6-340 K was measured on an adiabatic va
Penta(cyclopentadienyl)-η 5-cyclopentadienylmanganesetricarbonyl: Structure and laser-induced conversion to fullerenes
Barrow, Mark P.,Cammack, J. Kevin,Goebel, Matthias,Wasser, Ian M.,Vollhardt, K. Peter C.,Drewello, Thomas
, p. 135 - 139 (1999)
The title compound [Cp5CpMn(CO)3], 1, has been characterized by X-ray crystallography and shown by laser-induced desorption/ionization (LDI) to undergo dissociative coalescence to fullerene C60 and other carbon clusters.
Supply of gaseous carbon for the production of fullerenes
Lehmberg H.
, p. 703 - 706 (1993)
The method of fullerene production by graphite evaporation has been modified by adding carbonaceous gases to the noble gas atmosphere. Time of flight mass spectrometry and optical absorption measurements on the reaction products are reported. Whereas simple hydrocarbons prevent the growth of fullerenes the addition of a fluorinated carbonaceous gas yields large carbon molecules in the C2n-sequence, molecules with 2n≠60 at present occurring comparatively abundant.
