A5077497999- Fullerene Chemistry and Applications
- Graphene research and applications
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- X-ray Diffraction in Crystallography
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- Boron and Carbon Nanomaterials Research
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- Advanced Chemical Physics Studies
- Iterative Learning Control Systems
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- Simulation Techniques and Applications
- Hemoglobin structure and function
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- Advanced Algorithms and Applications
- Engineering Structural Analysis Methods
- Mechanical stress and fatigue analysis
Tokyo Gakugei University
2016-2025
Cincinnati Children's Hospital Medical Center
2006-2025
Kansai University
2010-2021
Shinshu University
2000-2021
Kyoto Institute of Technology
2011-2020
Rikkyo University
2004-2014
Tianjin Special Equipment Supervision and Inspection Technology Research Institute
2014
Japan Science and Technology Agency
2006-2013
Tohoku University
1994-2013
University of Tsukuba
2000-2010
In the applications of single-walled carbon nanotubes (SWNTs), it is extremely important to separate semiconducting and metallic SWNTs. Although several methods have been reported for separation, only low yields achieved at great expense. We show a separation method involving dispersion-centrifugation process in tetrahydrofuran solution amine, which makes SWNTs highly concentrated 87% simple way.
We report here the structural determination of Sc3C82 molecule by 13C NMR spectroscopy and X-ray single-crystal structure analysis. From present study, it is obvious that not Sc3@C82 but Sc3C2@C80.
We show here that La@C72 has a non-IPR cage, unique electronic properties, and high reactivity by the spectroscopic X-ray crystallographic analysis theoretical study. The isolation of as stable derivative might constitute an important stepping-stone on way to these unknown metallofullerenes open new material science metallofullerenes.
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT[email protected]82 Anion. An Unusually Stable MetallofullereneTakeshi Akasaka, Takatsugu Wakahara, Shigeru Nagase, Kaoru Kobayashi, Markus Waelchli, Kazunori Yamamoto, Masahiro Kondo, Shingo Shirakura, Okubo, Yutaka Maeda, Tatsuhisa Kato, Kako, Yasuhiro Nakadaira, Ritsuko Nagahata, Xiang Gao, Eric Van Caemelbecke, and Karl M. KadishView Author Information Graduate School of Science Technology Niigata University, 950-2181, Japan Institute for...
The charge-ordering states with lattice distortions of a halogen-bridged binuclear-metal mixed-valence complex (called MMX chain), Pt2(dta)4I (dta = CH3CS2-), have been investigated by transport, magnetic, and optical measurements. This is binuclear unit-assembled conductor containing metal−metal bonds. It exhibits metallic conduction above room temperature, representing the first example one-dimensional transition-metal complex. Below 300 K it shows semiconducting behavior, which considered...
Using first principles calculations, we report for the time that large nearly neutral aromatic molecules, such as naphthalene and anthracene, small charge-transfer TCNQ DDQ, interact more strongly with metallic single-wall carbon nanotubes (SWNTs) versus their semiconducting counterparts molecular orientation of DDQ is taken into account. Hence two new mechanisms separating SWNTs via noncovalent pi-pi stacking or interaction are suggested.
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. structure compound 2 is confirmed by ESR, MS, UV-vis-NIR spectroscopies, the first X-ray crystallographic characterization an endohedral monometallofullerene derivative reported.
The first isolation of missing metallofullerene, La@C74, as a derivative is reported. structural determination has been performed by spectroscopic and, finally, X-ray crystallographic analysis, and the properties La@C74 are discussed on basis theoretical study.
Fullerenes violating the isolated pentagon rule (IPR) are only obtained in form of their derivatives. Since [5,5]-bond carbons highly reactive, they easily attacked by reagents to release bond strains. Non-IPR endohedral metallofullerenes, however, still have unsaturated sp (2) at [5,5] junctions, which allow chemical properties be probed. In this work, La 2@C 72 was chosen as a representative non-IPR metallofullerene, since it has been experimentally proposed either #10611 or #10958 cage...
It's what's on the inside that counts: The structure of Sc2C2@C82(III), as suggested by 13C NMR spectroscopy and density functional calculations (see picture, left; C red gray, Sc blue), contains two atoms C82 cage. This mode encapsulation is verified X-ray single-crystal analysis cycloadduct Sc2C2@C82(III) adamantylidene carbene right). Supporting information for this article available WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z701049_s.pdf or from author. Please note:...
The Mössbauer spectra in iron-carbon martensite could be resolved into four components arising from the 1st, 2nd, (3, 4)th neighboring iron atoms for carbon and remnant atoms. were found to cause localized changes of electronic states surrounding internal magnetic field, isomer shift quadrupole splitting first neighbors largely deviated those pure iron, i.e. , 265±2 KOe, -0.03±0.05 mm/sec 0.13±0.05 mm/sec, respectively, suggesting covalent admixture between fields shifts 2nd also slightly...
The geometries of fullerenes are governed by the isolated pentagon rule (IPR), which states that stable have each their 12 pentagons surrounded five hexagons. At dawn fullerene science, it was widely believed IPR would also be applicable for endohedral fullerenes. In 2000, idea altered discovery first non-IPR fullerenes, Sc2@C66 and Sc3N@C68. structural data were interpreted to indicate presence a pair doubly fused pentagons. However, structure has remained long-standing mystery, since is...
A stable diamagnetic monoanion of the La@C82 isomer was electrochemically prepared and isolated in order to disclose its cage symmetry. By measuring 13C NMR spectrum anion, it determined for first time that has Cs symmetry, as also confirmed by density functional calculations.
Sc3N@C80 has a lower thermal reactivity than La2@C80, although the same carbon cage (Ih) and oxidation state (C806-) as La2@C80. This result is attributed to difference in energy level distribution of LUMO between
The dispersion of small-diameter single-walled carbon nanotubes (SWNTs) produced by the CoMoCAT method in tetrahydrofuran (THF) with use amine was studied. absorption, photoluminescence, and Raman spectroscopies showed that centrifugation process leads to an effective separation metallic SWNTs from semiconducting SWNTs. Since this is simple convenient, it highly applicable industrial utilization for widespread applications
The exohedrally functionalized derivative of endohedral metallofullerene, Ce2@C80(Mes2SiCH2SiMes2), was successfully synthesized and fully characterized. X-ray crystallographic NMR spectroscopic analyses reveal that the free random motion two metal atoms in Ce2@C80 is controlled inside cage by exohedral chemical functionalization.
This paper describes learning rules using simultaneous perturbation for a neurocontroller that controls an unknown plant. When we apply direct control scheme by neural network, the network must learn inverse system of In this case, know sensitivity function plant kind gradient method as rule network. On other hand, described here do not require information about function. Some numerical simulations two-link planar arm and tracking problem nonlinear dynamic are shown.
We report the observation of photoluminescence from single-walled carbon nanotubes (SWNTs) dispersed in a tetrahydrofuran(THF)/octylamine solution, providing first clear evidence for individual SWNTs nonaqueous solution. also effective amine-assisted dispersion C60 and La@C82 peapods. This solution phase handling is applicable to analysis electronic properties modification
Although Sc2C84 has been widely believed to have the form Sc2@C84, present 13C NMR study reveals that it is a scandium carbide metallofullerene, Sc2C2@C82, which C82(C(3v)) cage.
The endohedral pyrrolidinodimetallofullerene, La2@C80(CH2)2NTrt (Trt = triphenylmethyl), was successfully synthesized and characterized. X-ray crystallographic NMR spectroscopic analyses reveal that two La atoms in the 6,6-adduct are localized at stable site on mirror plane. Theoretical calculation also suggests localization of 6,6-adduct.
We report here the results on single crystal X-ray crystallographic analysis of Gd@C82 carbene adduct (Gd@C82(Ad), Ad = adamantylidene). The Gd atom in Gd@C82(Ad) is located at an off-centered position near a hexagonal ring C2v-C82 cage, as found for M@C82 (M Sc and La) La@C82(Ad). Theoretical calculation also confirms structure.
The photochemical reaction of M2@C80 (M = La and Ce) with 2-adamantane-2,3'-[3H]-diazirine (1) affords the corresponding adducts by carbene addition. were characterized spectroscopic single-crystal X-ray structure analyses. Crystallographic data for adduct La2@C80(Ad) (2, Ad adamantylidene) reveal that two atoms are collinear spiro carbon 6,6-open adduct. It is noteworthy La-La distance highly elongated addition carbene. Paramagnetic 13C NMR spectral analysis Ce2@C80(Ad) (3) indicates Ce...