115573-46-1Relevant articles and documents
Synthesis, mesomorphism, photophysics and device performance of liquid-crystalline pincer complexes of gold(iii)
Parker, Rachel R.,Liu, Denghui,Yu, Xiankang,Whitwood, Adrian C.,Zhu, Weiguo,Williams,Wang, Yafei,Lynam, Jason M.,Bruce, Duncan W.
, p. 1287 - 1302 (2021/02/12)
Emissive gold(iii) complexes of pincer 2,6-diphenylpyridines also bearing a phenylacetylide ligand have been modified at both the pincer and phenylacetylide to confer liquid crystalline properties, with most complexes showing a columnar hexagonal phase in
Alkyloxy modified pyrene fluorophores with tunable photophysical and crystalline properties
Kapf, Andreas,Eslahi, Hassan,Blanke, Meik,Saccone, Marco,Giese, Michael,Albrecht, Marcel
, p. 6361 - 6371 (2019/04/25)
Novel alkyloxy modified 2,7-di-tert-butyl-4,5,9,10-tetra(arylethynyl)pyrenes were prepared through a straightforward Sonogashira coupling approach. Optical properties such as quantum yields and absorption/emission spectra of the fluorophores were investigated by UV/Vis and fluorescence measurements. Aggregation induced excimer formation of the chromophores in polar solvents and in the solid state was proved by the presence of a characteristic bathochromically shifted emission band and a decrease of the emission capability. These results strongly indicate the unexpected observation that the excimer formation of adjacent pyrene rings is not prevented by the introduction of bulky tert-butyl substituents. Single-crystal X-ray and computational analyses reveal the co-planar alignment of adjacent molecules and the presence of π-π-stacking in the molecular packing of the pyrene polyaromatics. Furthermore, fluorescence, DSC and POM measurements indicate that the aggregation behaviour, the thermal characteristics and the crystalline properties are significantly influenced by changing structural features of the attached functional groups at the periphery of the pyrene core.
Thermal and nonlinear optical studies of newly synthesized EDOT based bent-core and hockey-stick like liquid crystals
Gowda, Ashwathanarayana,Jacob, Litwin,Joy, Nithin,Philip, Reji,Pratibha,Kumar, Sandeep
, p. 2047 - 2057 (2018/02/09)
Novel EDOT based bent-core and hockey-stick shaped mesogens bearing terminal alkyl chains and alkoxy terminal chains, respectively, have been designed and synthesized via the Sonogashira coupling reaction. Molecular structures of these new compounds were
Solution processable symmetric 4-alkylethynylbenzene end-capped anthracene derivatives
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
, p. 541 - 548 (2012/05/05)
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.
Electron acceptors based on functionalizable cyclopenta[hi]aceanthrylenes and dicyclopenta[de,mn]tetracenes
Wood, Jordan D.,Jellison, Jessica L.,Wang, Lichang,Plunkett, Kyle N.,Finke, Aaron D.
, p. 15783 - 15789,7 (2020/08/24)
We report the synthesis and selective functionalization of two externally fused cyclopenta-fused polycyclic aromatic hydrocarbons (CP-PAHs) and demonstrate their electron accepting behavior. 2,7-Bis(trimethylsilyl) cyclopenta[hi]aceanthrylene (1) and 2,8-
Buchwald protocol applied to the synthesis of N-heterotolan liquid crystals
Vasconcelos, Ursula B.,Schrader, Abel,Vilela, Guilherme D.,Borges, Antonio C.A.,Merlo, Aloir A.
, p. 4619 - 4626 (2008/09/20)
A homologous series of the new N-heterotolans 8a-d were synthesized using two cross-coupling reactions mediated by copper and palladium/copper. The final compounds present the phenyl-pyridyl framework connected by the acetylene group. The evaluation of th
Luminescent 2,1,3-benzothiadiazole-based liquid crystalline compounds
Vieira, André A.,Cristiano, Rodrigo,Bortoluzzi, Adailton J.,Gallardo, Hugo
, p. 364 - 371 (2008/09/18)
A series of fluorescent 2,1,3-benzothiadiazole-based liquid crystals bearing a π-extended aromatic portion through C{triple bond, long}C triple bond was synthesized and characterized. The X-ray structure of the rigid core was performed. The mesomorphism a
NOVEL ORGANIC SEMICONDUCTOR COMPOUND, AND ORGANIC THIN FILM TRANSISTOR USING THE SAME
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Page/Page column 37-38, (2008/12/04)
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.
Synthesis and mesomorphic properties of some fluorinated benzoate liquid crystals
Yang, Yong Gang,Chen,Tang,Wen
, p. 1 - 15 (2007/10/03)
Three series of [4-(4′-n-alkyloxyphenyl)acetylenyl]-2,6- difluorophenyl fluorinated benezoates and one series of fluorinated benzoates with 2,3,5,6-tetrafluorophenylene group and semi-perfluorocarbon chain have been synthesized. Their phase transition temperatures have been measured by texture observation in a polarizing microscope and confirmed by DSC. For the series without fluorocarbon chains, increasing the quantity of fluorosubstituents on the terminal phenyl groups decreased nematic stability (TN-I), but the breadth of the SmA phase range was increased. Lateral fluorosubstitution in the central group lowered the nematic stability (TN-I) and decreased the breadth of the SmA phase range. The series with semiperfluorocarbon chains were more likely to form SmA phases than the series with hydrogencarbon chains, and with the increasing of fluorosubstituents quantity on the terminal phenyl groups nematic and SmA stability (TN-I and TsmA-N) were both decreased.
Novel liquid-crystalline mercury acetylide complexes
Varshney,Shankar Rao,Kumar
, p. 55 - 65 (2007/10/03)
Several new mercury acetylide complexes were prepared from substituted phenyl acetylenes. These are of three varieties: i) where normal or branched alkyl chains are attached to the phenyl ring directly, ii) where these chains are attached via an oxygen at
