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281.
Prabeer Barpanda Rémi Dedryvère Michael Deschamps Charles Delacourt Marine Reynaud Atsuo Yamada Jean-Marie Tarascon 《Journal of Solid State Electrochemistry》2012,16(5):1743-1751
Recently unveiled ‘alkali metal fluorosulphate (AMSO4F)’ class of compounds offers promising electrochemical and transport properties. Registering conductivity value as high as
10−7 S cm−1 in NaMSO4F phases, we explored the fluorosulphate group to design novel compounds with high Li-ion conductivity suitable for solid
electrolyte applications. In the process, we produced sillimanite-structured LiZnSO4F by low temperature synthesis (T ≤ 300 °C). Examining this phase, we accidentally discovered the possibility of improving the ionic conductivity of poor conductors
by forming a monolayer of ionic liquid at their particle surface. This phenomenon was studied by solid-state NMR, XPS and
AC impedance spectroscopy techniques. Further, similar trends were noticed in other fluorosulphate materials like tavorite
LiCoSO4F and triplite LiMnSO4F. With this study, we propose ‘ionic liquid grafting’ as an interfacial route to enable good Li-ion conductivity in otherwise
poor conducting ceramics. 相似文献
282.
283.
Hosoi H Kawai N Hagiwara H Suzuki T Nakazaki A Takao K Umezawa K Kobayashi S 《Chemical & pharmaceutical bulletin》2012,60(1):137-143
We describe the total synthesis and structural determination of (+)-akaterpin (1), an inhibitor of phosphatidylinositol-specific phospholipase C (PI-PLC). The key features of the synthetic strategy include the resolution of β,γ-unsaturated ketone (±)-2a with chiral sulfoximine 6. The absolute stereochemistry was determined by comparison of the specific optical rotation data of (+)-1 and (-)-1 with that of natural akaterpin. 相似文献
284.
Daisuke Yamashita Yoshihisa Murata Dr. Naotsuka Hikage Dr. Ken‐ichi Takao Prof. Dr. Atsuo Nakazaki Dr. Susumu Kobayashi Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(8):1404-1406
No bones about it : (?)‐Norzoanthamine, a promising candidate for an anti‐osteoporotic drug, was the target of a total synthesis (see scheme). The final bisaminal formation with AcOH/H2O gave the DEFG ring, while the cyclization precursor was prepared by installing the remaining bisaminal unit after oxidative cleavage of the cyclopentanol moiety.
285.
C.-B. Moon T. Komatsubara T. Shizuma K. Uchiyama Y. Sasaki K. Furuno 《The European Physical Journal A - Hadrons and Nuclei》1999,4(2):107-109
High-spin states in 121Xe have been studied via the 109Ag (16O, p3n) 121Xe reaction at a beam energy of 80 MeV. Several rotational bands based on one- and three-quasiparticle excitations have been
established. Among them, an unfavoured yrare rotational band with unfavoured signature has been newly identified.
Received: 19 November 1998 相似文献
286.
Intrahelical photoinduced electron transfer processes (ET) in conformationally restricted oligopeptides have been studied by nanosecond time-resolved transient spectroscopy. The helical peptides were constructed from sterically hindered alpha-aminoisobutyric acid (Aib) and two cyclic alpha-amino acids (Aib class) bearing electron acceptor and donor side chains (DkNap, ThQx). This helical backbone design provides high conformation stability, as previously demonstrated, and yields reliable 3(10)-helical architectures in solution. The forward ET between ThQx and 3DkNap is followed by a slow back ET thus giving rise to an accumulation of the charge-separated ion pairs for hundreds of nanoseconds. We demonstrate the modulation of electronic interactions by the number of intervening Aib residues separating acceptor-donor side chains and propose modifications of the peptide framework by inclusion of a non-Aib amino acid residue. These well-defined and sterically stable frameworks are suited for the precise evaluation of intrahelical electron transfer processes mediated by peptides. 相似文献