Hiroki Tanaka

The silyl-substituted silylene-NHC complex bis(tri-tert-butylsilyl)silylene-(1,3,4,5-tetramethylimidazol-2-ylidene) [((t)Bu(3)Si)(2)Si:←NHC(Me), 2] was synthesized and isolated as air- and moisture-sensitive orange crystals by reductive debromination of the dibromosilane ((t)Bu(3)Si)(2)SiBr(2) (1) with 2.0 equiv of KC(8) in the presence of NHC(Me). In addition, the silylene-NHC complex 2 cleanly underwent one-electron oxidation with 1.0 equiv of Ph(3)C(+)·Ar(4)B(-) (Ar(4)B(-) = tetrakis[4-(tert-

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparative study on crystal structures of ruthenium bipyridine carbonyl complexes [Ru(bpy)2(CO)2](PF6)2, [Ru(bpy)2(CO)(C(O)OCH3)]B(C6H5)4.cntdot.CH3CN, and [Ru(bpy)2(CO)(.eta.1-CO2)].cntdot.3H2O (bpy = 2,2'-bipyridyl)Hiroaki Tanaka, Biing Chiau Tzeng, Hirotaka Nagao, Shie Ming Peng, and Koji TanakaCite this: Inorg. Chem. 1993, 32, 8, 1508–1512Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of cis-(carbonyl)(.eta.1-carbon dioxide)bis(2,2'-bipyridyl)ruthenium, an active species in catalytic carbon dioxide reduction affording carbon monoxide and HCOO-Hiroaki Tanaka, Hirotaka Nagao, Shie Ming Peng, and Koji TanakaCite this: Organometallics 1992, 11, 4, 1450–1451Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published inissue 1 April 1992https://pubs.acs.org/doi/10.1021/om00040a010https:/

The first silyl-substituted Si3-allene, namely 1,1,3,3-tetrakis(di-tert-butylmethylsilyl)trisilaallene (4), was prepared as an air- and moisture-sensitive red solid by the reaction of the dilithiosilane (tBu2MeSi)2SiLi2 with the dichlorosilylene–NHC complex :SiCl2←NHC (NHC = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) in benzene at room temperature. Remarkably, the reaction of 4 with methanol proceeds regioselectively to form only the 3,3-dimethoxypentasilane derivative 5, in contrast to t

A large anomalous Hall effect (AHE) has been observed in ferromagnetic ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ with breathing kagome bilayers. To understand the underlying mechanism for this, we investigate the electronic structure of ${\mathrm{Fe}}_{3}{\mathrm{Sn}}_{2}$ by angle-resolved photoemission spectroscopy (ARPES). In particular, we use both vacuum ultraviolet light (VUV) and soft x ray (SX), which allow surface-sensitive and relatively bulk-sensitive measurements, respectively, and distin

We study the mechanism of the exceptionally large anomalous Hall effect (AHE) in the noncentrosymmetric antiferromagnet $\mathrm{Co}{\mathrm{Nb}}_{3}{\mathrm{S}}_{6}$ by angle-resolved photoemission spectroscopy (ARPES) and magnetotransport measurements. From ARPES measurements of $\mathrm{Co}{\mathrm{Nb}}_{3}{\mathrm{S}}_{6}$ and its family compounds ($\mathrm{Fe}{\mathrm{Nb}}_{3}{\mathrm{S}}_{6}$ and $\mathrm{Ni}{\mathrm{Nb}}_{3}{\mathrm{S}}_{6}$), we find a band dispersion unique to the Co in

π-Electronic ion pairs are of interest for fabricating electronic materials that use intermolecular interactions based on electrostatic and dispersion forces, defined as ^<i>i</i>π-^<i>i</i>π interactions, to provide dimension-controlled assemblies. Porphyrin ions, whose charge is delocalized in the core units, are suitable for ordered arrangement and assemblies by ion pairing. Herein, charged porphyrins were found to form solid-state assemblies and solution-state stacked ion

In this study, we present the results on silicon oxide films deposited using a Kr/O2/SiH4 high-density and low-ion-energy plasma at low temperature (400°C). The results demonstrate that the post-treatment using the Kr/O2 plasma can eliminate bulk traps related to hydroxylic groups in the films. The silicon oxide films deposited using the high-density low-ion-energy Kr/O2/SiH4 plasma exhibit excellent properties, e.g., low fixed charge density (4 ×1010 cm-2) and high breakdown electric field (>12

A new computational method has been developed for the analysis of three-dimensional large-amplitude motion of liquids with free surfaces in moving containers. The problem is formulated mathematically as a nonlinear initial-boundary value problem under the assumption of irrotational flow of an inviscid fluid. The free surface is moved during each time step in a Lagrangian manner, and its new position is calculated using a forward-time Taylor series expansion. One of the key features of the presen

Porphyrin-Au^III complexes, which were partially or totally modified with C₆ F₅ at the meso positions, were synthesized. The highly electron-withdrawing substituents induced electron-deficient states and Lewis acid properties. Single-crystal X-ray analysis of the ion pairs revealed ion-pairing assemblies with characteristics dependent on the number and substitution pattern of the C₆ F₅ units and the geometries of the anions.

The (η3-disilaallyl)lithium derivative 5 was synthesized by the reaction of the disilenyllithium species (tBu2MeSi)2Si═Si(SiMetBu2)Li (1) with tris(3,5-di-tert-butylphenyl)acetaldehyde. All data, including X-ray analysis and NMR spectra, show that 5 has a π-allyl-type structure, with an interaction between the Li+ ion and the Si═C π-electrons of the silene moiety in both the crystal structure and in toluene solution but no such interaction in polar THF solvent.

逐次二点真直度測定法にともなう誤差に関連し, その基本的な特性を検討した. この過程で, 変位計先端の不ぞろいが真直精度の測定結果に累積することを明らかにし, その補正方法を提示した. また工具台などの回転角変化を考慮した真直精度が, 逐次三点の測定により求めうることを示した. さらに旋盤の被削材を対象に, 回転中に測定された結果を静止時のもとの比較し, 機械の駆動状態でも安定に測定できることを示した.