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Fullerene
About: Fullerene is a research topic. Over the lifetime, 12723 publications have been published within this topic receiving 359173 citations.
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TL;DR: In this paper, it was shown that in condensed phases C20 molecules can act as dodecahedron carbon cages; in particular the capability of acting as a building blocks of hexagonal crystal.
83 citations
TL;DR: A new supramolecular host with good affinity toward fullerenes has been developed, built on a [3]rotaxane scaffold and contains two free-base porphyrin moieties as recognition units for fullerene.
83 citations
TL;DR: The results of this study suggest that decreasing the size of a fullerene cage with the same (Y(2)C(2))(4+) cluster results in nanoscale fullerenes compression (NFC) from a nearly linear stretched geometry to a constrained "butterfly" structure.
Abstract: The nanoscale parameters of metal clusters and lattices have a crucial influence on the macroscopic properties of materials. Herein, we provide a detailed study on the size and shape of isolated yttrium carbide clusters in different fullerene cages. A family of diyttrium endohedral metallofullerenes with the general formula of Y2C2n (n = 40–59) are reported. The high field 13C nuclear magnetic resonance (NMR) and density functional theory (DFT) methods are employed to examine this yttrium carbide cluster in certain family members, Y2C2@D5(450)-C100, Y2C2@D3(85)-C92, Y2C2@C84, Y2C2@C3v(8)-C82, and Y2C2@Cs(6)-C82. The results of this study suggest that decreasing the size of a fullerene cage with the same (Y2C2)4+ cluster results in nanoscale fullerene compression (NFC) from a nearly linear stretched geometry to a constrained “butterfly” structure. The 13C NMR chemical shift and scalar 1JYC coupling parameters provide a very sensitive measure of this NFC effect for the (Y2C2)4+ cluster. The crystal structur...
83 citations
TL;DR: In this article, electron energy-loss spectroscopy of carbon nanotubes was used to investigate the dielectric properties of graphite and showed that the peak energy of the π+σ plasmon energy varies from 22.0 eV to 24.5 eV.
Abstract: Carbon nanotubes were investigated by means of electron energy-loss spectroscopy. Two peaks due to the π plasmon and the π+σ plasmon were observed. The energy of the π+σ plasmon peaks varied from 22.0 eV to 24.5 eV, which roughly agrees with the average plasmon energy of graphite. A shoulder due to single electron excitations was observed at 13 eV, which was not observed in graphite. There were two kinds of nanotubes which exhibited their respective π plasmon peaks at 5.2 eV and 6.4 eV. The peaks in the dielectric function obtained by Kramers-Kronig analysis of the spectra were broader than those of graphite probably due to the curving of the graphitic sheets.
82 citations
TL;DR: In this article, two new pyrrolidinofullerenes, 1 and 2, have been synthesized and their photophysical properties have been investigated, and their singlet and triplet excited states have been examined with picosecond and nanosecond laser flash photolysis.
Abstract: Two new pyrrolidinofullerenes, 1 and 2, have been synthesized, and their photophysical properties have been investigated. The pyrrolidinofullerene 1 has three phenyl groups attached to the 1, 2, and 5 positions of the pyrrolidine ring. The pyrrolidinofullerene 2, on the other hand, has a flexible attachment with an N-methylaniline end group and is the prototype of a fullerene-aniline dyad. Singlet and triplet excited-state properties of these two functionalized fullerene derivatives have been examined with picosecond and nanosecond laser flash photolysis. The singlet and triplet excited states of these fullerenes exhibit characteristic absorption bands in the vis-IR region of the spectrum. The functionalization of C 60 with pyrrolidine groups shift the excited-state absorption maxima to the blue. Three different quenchers, O 2 , TEMPO, and ferrocene, are employed to investigate the reactivity of triplet excited states. The bimolecular quenching rate constants determined for these quenchers were in the range of 5.3 × 10 8 to 7.7 × 10 9 M -1 s -1 . The excited-state interactions of these functionalized fullerenes are compared to that of C 60 .
82 citations