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201.
Journal of Solid State Electrochemistry - Ionic liquid salt bridge (ILSB) that effectively minimizes the liquid junction potential in a galvanic cell articulates the nonthermodynamic measurability... 相似文献
202.
A unique effect of styrene additive on product selectivity was observed for RuH(2)(CO)(PPh(3))(3)-catalyzed C-H arylation of acetophenone derivatives bearing two ortho C-H bonds. Without styrene, the C-H arylation with arylboronates gives diarylation products as the major products throughout the reaction, but the use of styrene as an additive switches the product selectivity and leads to selective formation of monoarylation products. 相似文献
203.
Wang Y Kakiuchi T Yasui Y Mirkin MV 《Journal of the American Chemical Society》2010,132(47):16945-16952
Ion transfer (IT) processes in ionic liquids (ILs) are essential for their applications in electrochemical systems and chemical separations. In this Article, the first measurements of IT kinetics at the IL/water interface are reported. Steady-state voltammetry was performed at the nanometer-sized polarizable interface between water and ionic liquid, [THTDP(+)][C(4)C(4)N(-)], immiscible with it that was formed at the tip of a nanopipet. Kinetic measurements at such interfaces are extremely challenging because of slow mass-transfer rates in IL, which is ~700 times more viscous than water. The recently developed new mode of nanopipet voltammetry, common ion voltammetry, was used to overcome technical difficulties and ensure the reliability of the extracted kinetic parameters of IT. The results suggest that the rate of interfacial IT depends strongly on solution viscosity. Voltammetric responses of nanopipets of different radii were analyzed to evaluate the effect of the electrical double layer at the liquid/liquid interface on IT kinetics. The possibility of the influence of the charged pipet wall on ion transport was investigated by comparing currents produced by cationic and anionic species. Possible effects of relaxation phenomena at the IL/water interface on IT voltammograms have also been explored. 相似文献
204.
Kentaroh Kitazawa Takuya Kochi Fumitoshi Kakiuchi 《Journal of organometallic chemistry》2010,695(8):1163-1345
The RuH2(CO)(PPh3)3-catalyzed C-H functionalization of aromatic esters with 5,5-dimethyl-2-aryl-[1,3,2]dioxaborinanes (arylboronates) gave the ortho arylation products. This coupling reaction can be performed with various combinations of isopropyl benzoate derivatives and arylboronates. Introduction of CF3 group in the aromatic ring increased the reactivity of the esters. Pinacolone effectively served as an acceptor of a hydride generated by C-H bond cleavage, and the amount of pinacolone used also affected the yield of the arylation product. 相似文献
205.
Takuhiro Kakiuchi Shogo Hashimoto Narihiko Fujita Masatoshi Tanaka Kazuhiko Mase Shin-ichi Nagaoka 《Surface science》2010,604(9-10):L27-L30
Topmost-surface-sensitive Si-2p photoelectron spectra of a clean Si(1 0 0)-2 × 1 surface have been measured using Si-2p photoelectron Si-L23VV Auger coincidence spectroscopy (Si-2p–Si-L23VV PEACS). The escape depth of the PEACS electrons is estimated to be ~1.2 Å. The results support the assignments of the Si up-atoms, the Si down-atoms, the Si 2nd-layer, and the Si bulk proposed in previous researches. The Si-2p component with a binding energy of ?0.23 eV relative to the bulk Si-2p3/2 peak, is shown to originate mainly from the topmost surface. Site selectivity of PEACS is indicated to be achieved to some degree by carefully selecting the kinetic energy of the Auger electrons. Since PEACS can be applied to any surface, the present study opens a new approach to identify PES components. 相似文献
206.
207.
HPLC‐fluorescence determination of thiol compounds in the serum of human male and female subjects using HILIC‐mode column
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Yumiko Kono Hideaki Iizuka Muneki Isokawa Makoto Tsunoda Hideaki Ichiba Kiyomi Sadamoto Takeshi Fukushima 《Biomedical chromatography : BMC》2014,28(5):589-593
High‐performance liquid chromatography–fluorescence detection using a hydrophilic interaction chromatography‐mode column (ZIC®‐HILIC) was used to determine four kinds of thiol compounds in human serum. Sera were obtained from 34 subjects for this study (17 male subjects aged 22–38 years and 17 female subjects aged 18–38 years). Serum cysteine, cysteinylglycine, glutathione, and γ‐glutamylcysteine, derivatized with ammonium 7‐fluoro‐2,1,3‐benzoxadiazole‐4‐sulfonate, were separated on the ZIC®‐HILIC column and quantified. The serum concentrations of cysteine, cysteinylglycine, glutathione and γ‐glutamylcysteine were 226 ± 4.7, 23.4 ± 1.3, 3.7 ± 0.2 and 3.2 ± 0.1 μm , respectively. In addition, the concentrations of serum thiol compounds from male subjects were significantly higher than those of the female subjects (p < 0.05). Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
208.
209.
Tsumoru Morimoto Mana Yamashita Ai Tomiie Hiroki Tanimoto Kiyomi Kakiuchi 《化学:亚洲杂志》2020,15(4):473-477
We describe transfer carbonylation reactions of 2‐bromoarenes that contain a carbon‐nucleophile using aldehydes as a substitute for CO, leading to the formation of indanone derivatives. The transformation proceeds efficiently under RhI/Pd0‐hybrid catalytic conditions consisting of two discrete transition metals, rhodium and palladium, which catalyze the decarbonylation of aldehydes and the subsequent carbonylation of bromoarenes using the resulting carbonyl moiety, respectively. The majority of the abstracted CO is transferred directly to the product via a CO‐relay process from rhodium to palladium. 相似文献
210.
We propose a new theoretical approach to describe nucleus using bare nuclear interaction, in which the tensor and short-range correlations are described with the tensor optimized shell model (TOSM) and the unitary correlation operator method (UCOM), respectively. We show the obtained results of He and Li isotopes using TOSM + UCOM, such as the importance of the pn-pair correlated by the tensor force, and the structure differences in the 3/2? and 1/2? states of 5He. 相似文献