- Solution processable symmetric 4-alkylethynylbenzene end-capped anthracene derivatives
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New candidates composed of anthracene and 4-alkylethynylbenzene end-capped oligomers for OTFTs were synthesized under Sonogashira coupling reaction conditions. All oligomers were characterized by FT-IR, mass, UV-visible, and PL emission spectrum analyses, cyclic voltammetry (CV), differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), 1H-NMR, and 13C-NMR. Investigation of their physical properties showed that the oligomers had high oxidation potential and thermal stability. Thin films of DHPEAnt and DDPEAnt were characterized by spin coating them onto Si/SiO 2 to fabricate top-contact OTFTs. The devices prepared using DHPEAnt and DDPEAnt showed hole field-effect mobilities of 4.0 × 10-3 cm2/Vs and 2.0 × 10-3 cm2/Vs, respectively, for solution-processed OTFTs.
- Jang, Sang Hun,Kim, Hyunjin,Hwang, Min Ji,Jeong, Eun Bin,Yun, Hui Jun,Lee, Dong Hoon,Kim, Yun-Hi,Park, Chan Eon,Yoon, Yong-Jin,Kwon, Soon-Ki,Lee, Sang-Gyeong
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scheme or table
p. 541 - 548
(2012/05/05)
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- Development of organic field-effect properties by introducing aryl-acetylene into benzodithiophene
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Ethynylene-containing benzo[1,2-b:4,5-b′]dithiophene derivatives 1a-c (BPEBDT, BTEBDT and BHPEBDT) were designed and synthesized. Their physicochemical properties were studied by absorption spectra and electrochemistry. 1a-c displayed high field-effect tr
- Meng, Qing,Jiang, Lang,Wei, Zhongming,Wang, Chengliang,Zhao, Huaping,Li, Hongxiang,Xu, Wei,Hu, Wenping
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experimental part
p. 10931 - 10935
(2011/09/16)
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- NOVEL ORGANIC SEMICONDUCTOR COMPOUND, AND ORGANIC THIN FILM TRANSISTOR USING THE SAME
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The present invention relates to novel mono- molecular organic semiconductor compounds and organic thin film transistors comprising the same. The organic semiconductor compounds according to the present invention are characterized by a structure of an acene derivative substituted with acetylene groups at both ends, a structure of anthracene derivative substituted with acetylene groups, or a structure of a multi-nuclear aromatic derivative functionalized by naphthalene having an electron-donor substituent at both ends.
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Page/Page column 37
(2008/12/04)
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- Synthesis and solution-processed field effect transistors of liquid crystalline oligothiophenes
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An organic field-effect transistor (OFET), showing a mobility 0.015 cm 2 V-1 s-1 and an on/off ratio 104, which are as high as those of a dry-processed OFET of oligothiophenes, has been built by wet process usin
- Ashizawa, Minora,Kato, Reizo,Takanishi, Yoichi,Takezoe, Hideo
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p. 708 - 709
(2008/02/09)
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- Ordering of apolar and polar solutes in nematic solvents
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To illustrate the relative importance of electrostatic interactions, the LC-NMR data for a pair of polar and apolar solutes that are structural isomers, ortho- and para-dichlorobenzene, respectively, dissolved in polar and apolar nematogens were analyzed.
- Dingemans,Photinos,Samulski,Terzis,Wutz
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p. 7046 - 7061
(2007/10/03)
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- Synthesis and preliminary testing of molecular wires and devices
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Presented here are several convergent synthetic routes to conjugated oligo(phenylene ethynylene)s. Some of these oligomers are free of functional groups, while others possess donor groups, acceptor groups, porphyrin interiors, and other heterocyclic interiors for various potential transmission and digital device applications. The syntheses of oligo(phenylene ethynylene)s with a variety of end groups for attachment to numerous metal probes and surfaces are presented. Some of the functionalized molecular systems showed linear, wire-like, current versus voltage (I(V)) responses, while others exhibited nonlinear I(V) curves for negative differential resistance (NDR) and molecular random access memory effects. Finally, the syntheses of functionalized oligomers are described that can form self-assembled monolayers on metallic electrodes that reduce the Schottky barriers. Information from the Schottky barrier studies can provide useful insight into molecular alligator clip optimizations for molecuar electronics.
- Tour, James M.,Rawlett, Adam M.,Kozaki, Masatoshi,Yao, Yuxing,Jagessar, Raymond C.,Dirk, Shawn M.,Price, David W.,Reed, Mark A.,Zhou, Chong-Wu,Chen, Jia,Wang, Wenyong,Campbell, Ian
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p. 5118 - 5134
(2007/10/03)
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- Synthesis and Physical Properties of Asymmetric Diphenyldiacetylenic Liquid Crystals
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Fifty-six asymmetric diphenyl-diacetylene liquid crystal homologs including dialkyl, alkyl-alkoxy, cyano-alkyl, chloro-alkyl, fluoro-alkyl, difluoro-alkyl, lateral chloro-substituted fluoro-alkyl (or alkoxy), lateral fluoro-substituted asymmetric dialkyl, and vinyl-alkyl are synthesized and their physical properties evaluated.Among these asymmetric diphenyl-diacetylene liquid crystals, many dialkyl homologs exhibit low melting point, wide nematic range, and low heat of fusion.They are ideal host candidates for formulating eutectic mixtures.The polar groups make important contributions to the phase transition temperature, dielectric anisotropy, refractive indices and viscosity.Detailed effects depend on the position of the substitution.These new liquid-crystals compounds and mixtures are particularly useful for electro-optic modulation of infrared radiation. - Keywords: Diphenyl-diacetylenes, eutectic mixtures, electro-optic modulation, physical properties
- Meng, H.-H. B.,Dalton, L. R.,Wu, S.-T.
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p. 303 - 314
(2007/10/02)
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- Liquid crystal compounds and optically active compounds
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A compound usefull for liquid crystal component which is represented by the following formulas (1), (2), (3), or (4) ;, R1 -X1 -A1 -( A2 )n-Y1 -A3 -X2 -R2 (1), R1 -X1 -( A3 -Y1 )N-A1 -A2 -X2 -R2 (2), R3 -X1 -A4 -Y1 -A3 -X2 -R4 (3), R3 -X1 -A5 -Y1 -A1 -A2 -X2 -R4 (4), wherein R1 ,R2 ,R3 and R4 are C1 18 alkyl groups; X1 and X2 is -, O, S, -C≡C- or divarent groups such as COO, OCO, CH2 O or OCH2
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