نتایج جستجو برای: c82
تعداد نتایج: 146 فیلتر نتایج به سال:
The photochemical reaction of La@C82 with 2-adamantane-2,3-[3H]-diazirine affords adduct 2, La@C82(Ad), in a quantitative and highly selective manner. The structure of compound 2 is confirmed by ESR, MS, and UV-vis-NIR spectroscopies, and the first X-ray crystallographic characterization of an endohedral monometallofullerene derivative is reported.
Since the first proposal that fullerenes are capable of hosting atoms, ions, or clusters by the late Smalley in 1985, tremendous examples of endohedral metallofullerenes (EMFs) have been reported. Breaking the dogma that monometallofullerenes (mono-EMFs) always exist in the form of M@C2n while clusterfullerenes always require multiple (two to four) metal cations to stabilize a cluster that is u...
Single-walled carbon nanotubes (SWNTs) were synthesized by arc discharge using a non-magnetic catalyst [1] and heated in air at 440◦C for 30 minutes to open their ends. The nanotube diameters were determined by measuring the Radial Breathing Mode (RBM) frequency using Raman spectroscopy. On top a broad distribution of RBM frequencies, we found discrete peaks indicating abundance of nanotubes wi...
Endohedral metallofullerenes have been extensively studied over the past decade because of their unique structural and electronic properties.1 Scandium metallofullerenes are especially interesting because they can contain more than two metal atoms (Sc3@C82) which form metal clusters.2,3 Furthermore, a Sc nitride metallofullerene, Sc3N@C80 has been synthesized recently.4 The structures of these ...
RNA polymerase III (Pol III) transcribes short RNAs required for cell growth. Under stress conditions, the conserved protein Maf1 rapidly represses Pol III transcription. We report the crystal structure of Maf1 and cryo-electron microscopic structures of Pol III, an active Pol III-DNA-RNA complex, and a repressive Pol III-Maf1 complex. Binding of DNA and RNA causes ordering of the Pol III-speci...
RNA polymerases (Pol) II and III synthesize eukaryotic mRNAs and tRNAs, respectively. The crystal structure of the 12 subunit Pol II is known, but only limited structural information is available for the 17 subunit Pol III. Using mass spectrometry (MS), we correlated masses of Pol II complexes with the Pol II structure. Analysis of Pol III showed that the complete enzyme contains a single copy ...
We report the first results of surface collisions of pure hollow fullerenes ~C60, C70 and C78! and endohedral metallofullerenes ~Y@C82, Ca@C82 and Ca@C84!, isolated by liquid chromatography, against solid ~silicon and gold! surfaces and self-assembled monolayer ~SAM! films. The experiments have been performed by a reflectron type time-of-flight mass spectrometer modified for measuring surface-i...
DFT calculations consistently suggest that a lanthanide will sit on either the 6/6 bond inside C60 having a divalent state or the hexagonal center having a trivalent state. Some lanthanides can stay only above the 6/6 bond inside C60 to form stabilized structures, despite the greatly reduced metal-cage coordination numbers. The preference for C-C bonds by a divalent metal has been confirmed by ...
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