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41.
Suetsuna T Dragoe N Harneit W Weidinger A Shimotani H Ito S Takagi H Kitazawa K 《Chemistry (Weinheim an der Bergstrasse, Germany)》2002,8(22):5079-5083
We describe the HPLC separation and identification of N@C60 and N2@C60. These species were observed after eleven sequential HPLC separations. Their retention times are in the same range as those of the other noninteractive endohedral species of C60, such as noble gas endohedral C60. The separation factors of these endohedrals were evaluated by using a mixture of hexane/toluene as eluent. We note that this is the first evidence for the N2@C60 molecule existing in the form of endohedral C60 complex. 相似文献
42.
Masato Hashimoto Takafumi Kitazawa Tai Hasegawa Toschitake Iwamoto 《Journal of inclusion phenomena and macrocyclic chemistry》1991,11(2):153-158
The Hofmann-danon-typeo-xylene clathrate Cd[NH2(CH2)9NH2]Ni(CN)4·0.5(CH3)2C6H4, crystallizes in the triclinic space groupP witha = 15.118(3),b = 14.048(4),c = 7.325(1) Å, = 91.50(2), = 131.66(3), and = 107.50(2)°,V = 1051(1) Å3 andZ = 2. The structure, refined toR = 0.047 using 2851 reflections, reveals a three-dimensional host framework built of the layers of a two-dimensionalcatena-[cadmium tetra--cyanonickelate(Il)] network and of the ambidentate 1,9-diaminononane (danon) bridging the Cd atoms in adjacent networks. The guesto-xylene molecule is accommodated in the cavity formed in the interlayer space similar to that in the Hofmann-daotn-type. The skeleton of the danon in the Cd-NC9N-Cd linkage takes a (gauche)2(trans)8 conformation twisted at the (gauche)2 part in contrast with the all-trans conformation of 1,8-diaminononane in the Hofmann-daotn-type clathrate. The twisted (gauche)2 part of the danon skeleton occupies the interlayer space to such an extent that void space available for the guest o-xylene molecule decreases to half that in the Hofmann-daotn-type clathrate Cd[NH2(CH2)8NH2]Ni(CN)4·G.The Crystal structures of ,-Diaminoalkanecadmium(II)Tetracyanonickelate(II) - Aromatic Molecule Inclusion Compounds. VI. 相似文献
43.
Lixin Xiao Hidekazu Shimotani Masaki Ozawa Jing Li Nita Dragoe Kazuhiko Saigo Koichi Kitazawa 《Journal of polymer science. Part A, Polymer chemistry》1999,37(18):3632-3637
A novel [60]fullerene pearl-necklace polymer, poly(4,4′-carbonylbisphenylene trans-2-[60]fullerenobisacetamide), was synthesized by a direct polycondensation of trans-2-[60]fullerenobisacetic acid with 4,4′-diaminobenzophenone in the presence of large excesses of triphenyl phosphite and pyridine. In the present polymer, [60]fullerene pearls and diamine linkers were attached to each other by methano-carbonyl connectors. The molecular weight Mw of the polymer was determined to be 4.5 × 104 on the basis of the TOF-MS, and a GPC analysis of the polymer using polystyrene standards showed a weight-average molecular weight of 5.3 × 104. The UV-vis spectrum of the resultant polymer in N,N-dimethylacetamide (DMAc) exhibited a broad absorption (λmax 310 nm, ε 2.1 × 104 L · mol−1 · cm−1), tailing to longer wavelengths, and a fluorenscence peak centered at 550 nm was observed in DMAc. There was observed a large downfield-shift of the cyclopropane methyne proton in the 1H-NMR spectra from 4.57 ppm of the ethyl ester to 5.78 ppm of the polyamide. These observations indicate that the present polyamide is a high-molecular-weight [60]fullerene pearl-necklace polymer and that the cyclopropane rings are efficient to make the [60]fullerene cages and the diamine components conjugatable. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3632–3637, 1999 相似文献
44.
K. Hashi T. Shimizu A. Goto H. Kitazawa G. Kido T. Suzuki 《Applied Physics A: Materials Science & Processing》2000,70(3):359-360
An NMR quantum computer based on an integrated device with CeP has been proposed by Yamaguchi and Yamamoto [Appl. Phys. A 68 1 (1999)]. We point out two problems in their scheme. We also investigate experimentally the 31P NMR spectra for our CeP. From the line width, we find that improvement of the sample quality is necessary to satisfy the experimental conditions for a quantum computer. 相似文献
45.
Hall coefficient, resistivity and superconducting upper critical field Hn2 were measured on single-crystalline BaPb1?xBixO3 of compositions x = 0.20, 0.12 and 0, of which the normal-state properties differ significantly from those of polycrystals. The slope dHn2/dT at Tc was estimated from the normal-state parameters and was found to agree well with the observed value, suggesting that this material is a bulk BCS superconductor. 相似文献
46.
Takeda Masuo Wang Junhu Nishimura Tatsuru Suzuki Katsuya Kitazawa Takafumi Takahashi Masashi 《Hyperfine Interactions》2004,156(1-4):359-364
Hyperfine Interactions - We have examined the 155Gd Mössbauer spectra at 12 K for 25 complexes having different coordination numbers and different ratios of coordinating oxygen to nitrogen... 相似文献
47.
We investigate the correlators of TrAμAν in matrix models on homogeneous spaces: S2 and S2×S2. Their expectation value is a good order parameter to measure the geometry of the space on which non-commutative gauge theory is realized. They also serve as the Wilson lines which carry the minimum momentum. We develop an efficient procedure to calculate them through 1PI diagrams. We determine the large N scaling behavior of the correlators. The order parameter shows that fuzzy S2×S2 acquires a 4-dimensional fractal structure in contrast to fuzzy S2. We also find that the two point functions exhibit logarithmic scaling violations. 相似文献
48.
49.
Kamada A Sasaki A Kitazawa N Okabe T Nara K Hamaoka S Araki S Hagiwara H 《Chemical & pharmaceutical bulletin》2004,52(1):79-88
New types of selective estrogen receptor modulators (SERMs) were synthesized and evaluated for their binding affinity and biological effect on reproductive cells. A proposed lead structure (B) was derivatized to provide compounds 30 and 44, which showed good estrogen-receptor binding affinity (K(i) values: 6.3 and 10 nM, respectively), as well as minimal impact on mammary and uterine carcinoma cells. Introduction of an alkyl group in the core structure considerably enhanced receptor-binding affinity of the compounds tested. Synthesis and structure-activity relationships of these compounds are described. 相似文献
50.
Tonomura A Kasai H Kamimura O Matsuda T Harada K Yoshida T Akashi T Shimoyama J Kishio K Hanaguri T Kitazawa K Masui T Tajima S Koshizuka N Gammel PL Bishop D Sasase M Okayasu S 《Physical review letters》2002,88(23):237001
In order to elucidate the formation mechanism of unconventional arrangements of vortices in high- Tc superconducting thin films at an inclined magnetic field to the layer plane, we investigated the structures of vortex lines inside the films by Lorentz microscopy using our 1-MV field-emission electron microscope. Our observation results concluded that vortex lines are tilted to form linear chains in YBaCu3O(7,8). Vortex lines in the chain-lattice state in Bi2Sr2CaCu2O(8+delta), on the other hand, are all perpendicular to the layer plane, and therefore only vortices lined up along Josephson vortices form chains. 相似文献