126708-45-0Relevant articles and documents
Synthesis, mesomorphic properties and nonlinear optical studies of alkyl and alkoxy phenylacetylene containing phenazine fused extended triphenylene discotic liquid crystalline dyes
Gowda, Ashwathanarayana,Jacob, Litwin,Patra, Alakananda,George, Agnes,Philip, Reji,Kumar, Sandeep
, p. 128 - 135 (2018/08/07)
Herein, we have reported the alkyl and alkoxy phenylacetylene containing phenazine fused triphenylene discotic liquid crystals (DLCs) which are obtained by the condensation reaction of triphenylene-1,2-diquinone with 1,2-diamino-4,5-dibromobenzene, followed by Sonogashira C–C coupling reaction with 4-alkyl-phenylacetylene or 4-alkoxy-phenylacetylene. Six novel derivatives were synthesized and evaluated for their thermal and optical properties. They show a broad range of hexagonal columnar phase and retain their mesophase up to room temperature upon cooling from the isotropic liquid. Thermotropic liquid crystalline properties of all the compounds were studied by polarised optical microscopy (POM), differential scanning calorimetry (DSC). The self-assembly of mesophase structure was investigated by X-ray diffraction (XRD) studies. Thermogravimetric analysis of all the mesogens shows good thermal stability over a broad temperature range. The photophysical properties of newly synthesized compounds were measured using UV–Vis absorption and photoluminescence emission spectroscopy in anhydrous chloroform solvent. The π-extended conjugation in these mesogens exhibit strong absorption bands falling around 270–487 nm and corresponding emission band at 657–663 nm respectively. The high delocalization of π– electrons in extended discotic mesogens show high nonlinear optical properties when measured under excitation by nanosecond laser pulses at 532 nm. These materials may find distinctive applications in the semiconducting devices.
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
scheme or table, 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.
4-Substituted and 4,5-disubstituted 3,6-di(2-pyridyl)pyridazines: Ligands for supramolecular assemblies
Constable, Edwin C.,Housecroft, Catherine E.,Neuburger, Markus,Reymann, Sebastien,Schaffner, Silvia
experimental part, p. 1597 - 1607 (2009/04/11)
The syntheses by inverse electron demand Diels-Alder reactions and characterization of 28 members of a family of 3,6-di(2-pyridyl)pyridazines, functionalized in the 4- or 4,5-positions are reported. Single crystal structural data are presented for four representative derivatives. Wiley-VCH Verlag GmbH & Co. KGaA, 2008.
