排序方式: 共有166条查询结果,搜索用时 265 毫秒
161.
162.
Gholamhossein Grivani Aliakbar Dehno KhalajiVida Tahmasebi Kazuma GotohHiroyuki Ishida 《Polyhedron》2012,31(1):265-271
The Schiff base ligand N-salicylidin-2-bromoethylimine (L) and its vanadium(IV) complex, VOL2 (1), were synthesized and characterized by using X-ray, CHN, 1H NMR and FT-IR methods. X-ray analysis shows the Schiff base ligand L acts as a bidentate (O, N) chelating ligand and coordinates via imine nitrogen and phenolato oxygen atoms to the V(IV) center. The coordination geometry around the V(IV) center in 1 is approximately square pyramidal, as indicated by the unequal metal-ligand bond distances and angles, with the basal plane formed by the N2O2 donors of the two bidentate Schiff base ligands, the two phenolato O atoms and the two imine N atoms are in the trans position. The coordination sphere of the V(IV) is completed by one oxygen atom in apical position. In the Schiff base ligand, L, there are some classical intramolecular O1-H1?N1 and non-classical intermolecular C9-H9b?O1 hydrogen bonds, while in 1, there are two non-classical intermolecular C7-H7?O3 and C8-H8b?O3 hydrogen bonds. The catalytic activity of 1 in epoxidation of cyclooctene was investigated in different conditions to obtain optimum conditions. The effects of solvent, oxidant, catalyst concentration and alkene/oxidant ratio were studied and the results showed that in CCl4 in the presence of tert-butylhydroperoxide in 1:3 alkene/oxidant ratio, high epoxide yield was obtained. The epoxidation of alkenes was also carried out in optimized conditions that high catalytic activity and selectivity were obtained. 相似文献
163.
Kihoon Jang Yan Xu Kae Sato Yo Tanaka Kazuma Mawatari Takehiko Kitamori 《Mikrochimica acta》2012,176(1-2):49-55
Platinum nanoparticles were electrodeposited onto a film of dihexadecyl hydrogen phosphate deposited on a glassy carbon electrode (GCE) and modified with dispersed acetylene black. Scanning electron microscopy and electrochemical impedance spectroscopy revealed that this nanocomposite has a uniform nanostructure and a large surface area that enables fast electron-transfer kinetics. The modified GCE showed high electrocatalytic activity for the oxidation of nitric oxide (NO). Under optimal conditions, the oxidation peak current of nitric oxide is linearly related to the concentration of NO in the concentration range between 0.18 and 120?μM, and the detection limit is as low as 50?nM (at an S/N of 3). The modified electrode was successfully applied to sensing of NO as released from rat liver. Figure
Acetylene black (AB) was dispersed with dihexadecyl hydrogen phosphate (DHP) and modified on the surface of glassy carbon electrode (GCE) to fabricate AB/GCE, after activating in NaOH solution, the AB film became more porous and loosened, then through electrodepositing Pt nanoparticles (PtNPs) on the activated AB film, PtNP/AB/GCE was obtained, which was denoted as NO electrochemical sensor. 相似文献
164.
Xu Y Jang K Yamashita T Tanaka Y Mawatari K Kitamori T 《Analytical and bioanalytical chemistry》2012,402(1):99-107
By combining cell technology and microchip technology, innovative cellular biochemical tools can be created from the microscale
to the nanoscale for both practical applications and fundamental research. On the microscale level, novel practical applications
taking advantage of the unique capabilities of microfluidics have been accelerated in clinical diagnosis, food safety, environmental
monitoring, and drug discovery. On the other hand, one important trend of this field is further downscaling of feature size
to the 101–103 nm scale, which we call extended-nano space. Extended-nano space technology is leading to the creation of innovative nanofluidic
cellular and biochemical tools for analysis of single cells at the single-molecule level. As a pioneering group in this field,
we focus not only on the development of practical applications of cellular microchip devices but also on fundamental research
to initiate new possibilities in the field. In this paper, we review our recent progress on tissue reconstruction, routine
cell-based assays on microchip systems, and preliminary fundamental method for single-cell analysis at the single-molecule
level with integration of the burgeoning technologies of extended-nano space. 相似文献
165.
Aliakbar?Dehno?KhalajiEmail author Hossein?Mighani Kazuma?Gotoh Hiroyuki?Ishida 《Journal of chemical crystallography》2011,41(8):1154-1157
Abstract
New Schiff base compound 2-amino-N-(3-phenylprop-2-enylidene)aniline, 1, was prepared by condensation of cinnamaldehyde with o-phenylenediamine and characterized by elemental analyses, UV–Vis and FT-IR spectroscopy. The crystal structure of 1 was determined by X-ray crystallography from single-crystal data and displays a trans configuration about the C=N double bond. In the crystal structure of 1, the molecule is located on an inversion center, so that it is disordered around the center of central C–C bond. The results from both the experimental and theoretical calculations are compared in this paper. 相似文献166.
Kazuma Gotoh Hiroyuki Ishida 《Acta Crystallographica. Section C, Structural Chemistry》2009,65(10):o534-o538
The structures of four isomeric compounds, all C7H4ClNO4·C9H7N, of quinoline with chloro‐ and nitro‐substituted benzoic acid, namely, 2‐chloro‐5‐nitrobenzoic acid–quinoline (1/1), (I), 3‐chloro‐2‐nitrobenzoic acid–quinoline (1/1), (II), 4‐chloro‐2‐nitrobenzoic acid–quinoline (1/1), (III), and 5‐chloro‐2‐nitrobenzoic acid–quinoline (1/1), (IV), have been determined at 185 K. In each compound, a short hydrogen bond is observed between the pyridine N atom and a carboxyl O atom. The N...O distances are 2.6476 (13), 2.5610 (13), 2.5569 (12) and 2.5429 (12) Å for (I), (II), (III) and (IV), respectively. Although in (I) the H atom in the hydrogen bond is located at the O site, in (II), (III) and (IV) the H atom is disordered in the hydrogen bond over two positions with (N site):(O site) occupancies of 0.39 (3):0.61 (3), 0.47 (3):0.53 (3) and 0.65 (3):0.35 (3), respectively. 相似文献