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排序方式: 共有87条查询结果,搜索用时 9 毫秒
31.
Chuang TH Hsieh HH Chen CK Wu CC Lin CC Chou PT Chao TH Chow TJ 《Organic letters》2008,10(13):2869-2872
A CO adduct of pentacene with an unsymmetrical structure is synthesized; it is soluble and can be spin-coated into thin films. Pentacene is regenerated in near quantitative yield by either thermal or photoinduced elimination of CO. OTFT devices fabricated by this compound exhibit typical FET characteristics. 相似文献
32.
Duo‐Fong Huang Tahsin J. Chow Cheng‐Yang Wu Shih‐Sheng Sun Sheng‐Heng Tsai Yuh‐Sheng Wen Silviu Polosan Taiju Tsuboi 《中国化学会会志》2008,55(2):439-448
Four derivatives of the titled compounds, (8‐hydroxyquinoline)bis(2‐phenylpyridyl)iridium ( IrQ(ppy)2 ), were prepared. Two of them were confirmed by single crystal X‐ray diffraction analyses, in which solvent molecules were found to be incorporated in the crystal lattices. Their emission spectra display separated dual bands in de‐aerated solutions at about 515 and 645 nm upon excitation. These green and red emissions are attributed to the triplet metal‐to‐ligand charge transfer (3MLCT) and triplet ligand centered (3LC) transitions in Ir(ppy)2 and IrQ, respectively. It is suggested that such a multiple emission is feasible by nearly orthogonal orientation between the ppy and quinoline ligands in the mixed‐ligand Ir‐compounds which prohibits energy transfer between the two different ligands. The electroluminescence (EL) of these compounds was examined by the fabrication of light‐emitting diodes (LEDs). Unlike the spectra in solutions, their EL spectra displayed only the red emission band. Devices displaying white light can be obtained by mixing the red emission of IrQ(ppy)2 with a compatible blue emitter (NPB) in separated layers. 相似文献
33.
The sterically congested tetraarylpyrenes 1-3, which can be readily accessed by Suzuki coupling, exhibit no-aggregation (pi-stacking) behavior in both solution and solid states. The indisposed tendency of 1-3 toward crystallization and their moderate molecular dimensions permit exploitation as blue light emitting materials in OLEDs with respectable device performances. 相似文献
34.
35.
Chang YJ Watanabe M Chou PT Chow TJ 《Chemical communications (Cambridge, England)》2012,48(5):726-728
Organic dyes consisting of a [2.2]paracyclophane unit along the main chromophore are examined for their application in sensitized solar cells. These materials exhibit considerably high values of open-circuit voltage (V(oc)) ranging 0.69-0.72 V, and an overall efficiency up to 3.8%. 相似文献
36.
In this study, we prepared a Metal(Al)/Organic Interlayer(Congo Red=CR)/Inorganic Semiconductor (p-Si) (MIS) Schottky device formed by coating of an organic film on p-Si semiconductor wafer. The Al/CR/p-Si MIS device had a good rectifying behavior. By using the forward bias I-V characteristics, the values of ideality factor (n) and barrier height (Φb) for the Al/CR/p-Si MIS device were obtained as 1.68 and 0.77 eV, respectively. It was seen that the Φb value of 0.77 eV calculated for the Al/CR/p-Si MIS device was significantly higher than value of 0.50 eV of the conventional Al/p-Si Schottky diodes. Modification of the interfacial potential barrier of the Al/p-Si diode was achieved by using a thin interlayer of the CR organic material. This was attributed to the fact that the CR organic interlayer increased the effective barrier height by influencing the space charge region of Si. The interface-state density of the MIS diode was found to vary from 1.24×1013 to 2.44×1012 eV−1 cm−2. 相似文献
37.
A multiple-disk Tesla type fan has been designed, tested and analyzed two-dimensionally using the conservation of angular momentum principle. Experimental results showed that such multiple-disk fans exhibited exceptionally low performance characteristics, which could be attributed to the low viscosity, tangential nature of the flow, and large mechanical energy losses at both suction and discharge sections that are comparable to the total input power. By means of theoretical analysis, local and overall shearing stresses on the disk surfaces have been determined based on tangential and radial velocity distributions of the air flow of different volume flow rates at prescribed disk spaces and rotational speeds. Then the total power transmitted by rotating disks to air flow, and the power acquired by the air flow in the gap due to transfer of angular momentum have been obtained by numerically integrating shearing stresses over the disk surfaces. Using the measured shaft and hydraulic powers, these quantities were utilized to evaluate mechanical energy losses associated with the suction and discharge sections of the fan. 相似文献
38.
Mustafa Tombul Kutalmis Guven Tahsin N. Durlu 《Journal of chemical crystallography》2009,39(6):445-448
Abstract A dimeric sodium supported borate complex, [Na(py)][B(hyncaH−2)2]2
(1) (py = pyridine, hynca = 1-hydroxynaphthalene-2-carboxylic acid), has been synthesised by the reaction of NaBH4 with two equivalents of hynca in anhydrous THF and following crystallization from py/H2O solution afforded borate ester derivative. The complex has been fully characterized by FT-IR in the solid state and by NMR
(1H and 13C) spectroscopy and electrospray ionization mass spectrometry in solution. The molecular structure of the title compound was
determined by single crystal X-ray diffraction. Structure analysis of complex 1 confirmed the presence of an anionic complex [B(hyncaH−2)2]− in which boron atom is coordinated simultaneously by two hynca ligands utilising both alkoxide and carboxylate groups for
bonding. The Na atom is six- coordinate to five O atoms of hydroxy carboxylic acid and one pyridine N atom. Crystal data:
crystal system, monoclinic, a = 10.971(3) Å, b = 6.839(3) Å, c = 30.545(5) Å, β = 92.20(2)°, space group P21/c (#14), V = 2,290(1) Å3, Z = 4.
Index Abstract There are limited examples of alkali metal supported borate ester complexes.
相似文献
39.
Mehmet Kabak Yal
in Elerman Vildan Güner Tahsin Nuri Durlu 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(5):e207-e208
In the title compound, C35H26ClNO, the four‐membered β‐lactam ring is essentially planar, with a maximum deviation of 0.012 (1) Å for the N atom. The C—C bond lengths in the β‐lactam ring are 1.591 (2) and 1.549 (2) Å. The two phenyl rings attached to the β‐lactam ring are nearly perpendicular to each other [83.2 (1)°]. 相似文献
40.
The dual emission spectra of β-naphthil in two different glasses at 77° K have been resolved to their individual components by a computerized kinetic phosphorescence spectrometry system. Both the time-resolved spectrum which reveals the kinetic behavior of the excited states and the wavelength-resolved spectrum which tells the nature of the emitting species are obtained. Several possible emission mechanisms are discussed based on the informations gathered through the resolution processes. Triplet-triplet annihilation is shown to exist in solutions of benzophenone as well as in solutions of β-naphthil. As concluded from the results of time-resolved study, such kind of interaction is responsible for the non-exponential distorsion of the decays. And according to the wavelength-resolved studies, transoid and cisoid conformational isomers seem to accout for the sources of the dual emission of β-naphthil. 相似文献