296 research outputs found
2-(4-tert-Butylphenyl)-5-{3,4-dibutoxy-5-[5-(4-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]-2-thienyl}-1,3,4-oxadiazole
In the title compound, C36H44N4O4S, the dihedral angles between the central thiophene ring and the pendent oxadiazole rings are 12.7 (2) and 13.7 (2)°, and the dihedral angles between the oxadiazole rings and their adjacent benzene rings are 6.1 (2) and 17.5 (2)°. An intramolecular C—H⋯O interaction may help to establish the conformation
Ethyl 2-(2-hydroxy-5-nitrophenyl)acetate
In the crystal structure of the title compound, C10H11NO5, intermolecular O—H⋯O hydrogen bonds link the molecules into chains along the b-axis direction. Weak C—H.·O hydrogen bonds also occur
3-[4-(Trifluoromethyl)phenyl]propanoic acid
In crystal of the the title compound, C10H9F3O2, inversion dimers linked by pairs of O—H⋯O hydrogen bonds occur
4-Bromo-2-[1-(4-ethoxyphenyl)-1-methylethyl]-1-methylbenzene
In title compound, C18H21BrO, the dihedral angle between two rings is 85.72°. No classical hydrogen bonds are found and only van der Waals forces stabilize the crystal packing
Ethyl 5-methylimidazo[1,2-a]pyridine-2-carboxylate
The title compound, C11H12N2O2, was synthesized from the reaction of 6-methylpyridin-2-amine and ethyl 3-bromo-2-oxopropionate. In the molecular structure, the six- and five-membered rings are individually almost planar with r.m.s. deviations of 0.003 and 0.002 Å, respectively. The two rings are almost coplanar, the dihedral angle between their planes being 1.4 (3)°. Intermolecular C—H⋯O and C—H⋯N hydrogen bonds are present in the crystal structure
Photonic Localization of Interface Modes at the Boundary between Metal and Fibonacci Quasi-Periodic Structure
We investigated on the interface modes in a heterostructure consisting of a
semi-infinite metallic layer and a semi-infinite Fibonacci quasi-periodic
structure. Various properties of the interface modes, such as their spatial
localizations, self-similarities, and multifractal properties are studied. The
interface modes decay exponentially in different ways and the modes in the
lower stable gap possess highest spatial localization. A localization index is
introduced to understand the localization properties of the interface modes. We
found that the localization index of the interface modes in the upper stable
gap will converge to two slightly different constants according to the parity
of the Fibonacci generation. In addition, the localization-delocalization
transition is also found in the interface modes of the transient gap.Comment: 20 pages, 5figure
シベリア亜寒帯林における樹冠と林床の植生指数
Clinical characteristic of patients with rheumatoid arthritis (RA) and trauma. (DOC 45 kb
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