4956-41-6Relevant academic research and scientific papers
Iridium-based emitters containing pendant triphenylene moieties for bluish-green OLEDs with improved efficiency upon thermal annealing
Wang, Yafei,Zhu, Mengbing,Deng, Jiyong,Xie, Guohua,Baranoff, Etienne
, p. 1773 - 1780 (2017)
Two new cyclometalated iridium complexes with non-conjugated triphenylene moieties attached to the ancillary ligand, namely YF3 and YF4, are reported. Both iridium complexes presented intense bluish-green emission both in solution (ΦPL ～ 0.37-0
A Novel Conjugated Polymer Consists of Benzimidazole and Benzothiadiazole: Synthesis, Photophysics Properties, and Sensing Properties for Pd2+
Hu, Zijun,Liu, Kuan
, (2020/02/05)
A conjugated polymer PPBIBTE based on benzimidazole and benzothiadiazole was synthesized through palladium-catalyzed sonogashira cross-coupling reaction. The chemical structures of the monomers and the polymer were indicated by 1H NMR, and investigation of photophysics properties and sensing optical properties for metal ions were observed by ultraviolet–visible and photoluminescence spectroscopy. PPBIBTE showed remarkable selectivity for Pd2+ by “turn-off” fluorescence sensing progress. In addition, the Stern–Volmer and Benesi-Hildebrand plots were used to reveal the interaction between the polymer and Pd2+, while job's method was applied to calculate the determination of stoichiometry. The results demonstrate that PPBIBTE can utilize static quenching for Pd2+ by forming a 1:1 complex. And it is a potential sensing material as fluorescence chemosensor for Pd2+ with high selectivity and sensitivity.
Investigation of Optical and Electrochemical Properties of Benzene Based Solution Processable 2,1,3-Benzooxadiazole Comprising Polymers
Goker, Seza,Hacioglu, Serife O.,Hizalan, Gonul,Toppare, Levent
, (2020/10/09)
Four novel solution processable benzooxadiazole containing alternating copolymers namely poly (5,6-bis(octyloxy)-4-(5-phenylthiophen-2-yl)-7-(thiophen-2-yl)benzo[c][1,2,5]oxadiazole)PBOTPh, poly (5,6-bis(octyloxy)-4-(5-phenylselenophen-2-yl)-7-(selenophen
A Constrained and “Inverted” [3+3] Salphen Macrocycle with an ortho-Phenylethynyl Substitution Pattern
Torres, Tomas,Urbani, Maxence
supporting information, (2020/02/04)
A [3+3] Schiff-base salphen macrocycle (7 a) was synthesized by imine condensation between ortho-phenylenediamine and ortho-phenylethynyl-bridged bis(5-salicylaldehyde) precursors. The triangular-shaped macrocycle 7 a has a nonclassical (or “inverted”) de
Constructing a self-assembling C3-symmetric covalently linked (fused) donor-acceptor-type molecule containing a hexaazatriphenylene core
Bhanvadia, Viraj J.,Patel, Arun L.,Zade, Sanjio S.
supporting information, p. 17700 - 17707 (2018/11/01)
A C3-symmetric covalently linked (fused) molecule, HAT-IPN, comprising a 13 fused ring system was synthesized by a condensation-cyclisation reaction between hexaazatriphenylenehexacarboxylic acid trisanhydride and 4,5-diamino-1,2-dioctyloxybenzene. This fused system exhibits ambipolar behaviour due to an n-type HAT-core at the center and three outer p-type fused dialkoxybenzimidazole moieties, which is confirmed by cyclic voltammetry. The self-assembling nature of this disc-shaped donor-acceptor type system is evident in13C NMR spectroscopy, dynamic light scattering studies, differential scanning calorimetry and atomic force microscopy (AFM) images, which illustrate the formation of the one-dimensional aggregates both in solution and in the film state; indicating its potential as an active component in organic electronic devices.
Synthesis and optoelectronic property manipulation of conjugated polymer photovoltaic materials based on benzo[d]-dithieno[3,2-b;2′,3′-f]azepine
Wang, Jian,Yin, Pan,Wu, Yue,Liu, Gangjian,Cui, Chaohua,Shen, Ping
, p. 184 - 195 (2018/06/14)
To develop new conjugated polymers (CPs) based on heteroepines, a soluble azepine moiety of benzo [d]-dithieno [3,2-b; 2′,3′-f]azepine was copolymerized with different building blocks to obtain a series of CPs. A broad absorption range of 300–850 nm and t
Hydrogen bond-driven columnar self-assembly of electroluminescent D-A-D configured cyanopyridones
Vinayakumara,Ulla, Hidayath,Kumar, Sandeep,Pandith, Anup,Satyanarayan,Rao, D. S. Shankar,Prasad, S. Krishna,Adhikari, Airody Vasudeva
supporting information, p. 7385 - 7399 (2018/07/25)
Herein, we report the design and synthesis of a new series of flying bird-shaped liquid crystalline (LC) cyanopyridone derivatives with a D-A-D architecture, CPO-1 to CPO-4. Their mesomorphic, photophysical, electrochemical, and electroluminescence charac
Fluorescent columnar bis(boron difluoride) complexes derived from tetraketonates
Chen, Ya-Wen,Lin, Yen-Chun,Kuo, Hsiu-Ming,Lai, Chung K.
, p. 5465 - 5477 (2017/07/10)
Three new series of bis-(boron difluoride) complexes 1a-c derived from substituted tetraketonates 2a-c are reported, and their mesomorphic and optical properties have been investigated. Two single crystals of mesogenic ligand 2a (n = 6) and nonmesogenic d
Quinoxaline-thiophene based thick photovoltaic devices with an efficiency of ～8%
Li, Yuxiang,Ko, Seo-Jin,Park, Song Yi,Choi, Hyosung,Nguyen, Thanh Luan,Uddin, Mohammad Afsar,Kim, Taehyo,Hwang, Sungu,Kim, Jin Young,Woo, Han Young
supporting information, p. 9967 - 9976 (2016/07/07)
A series of difluoroquinoxaline-thiophene based reduced band gap polymers was designed and synthesized by considering non-covalent coulombic interactions in a polymeric main chain. The insertion of different numbers of thiophene moieties allows for the adjustment of the absorption range, frontier energy levels, crystalline self-organization, film morphology and the resulting photovoltaic properties. A thick blend film of poly(thiophene-alt-(2,3-bis(3,4-bis(octyloxy)phenyl)-6,7-difluoroquinoxaline)) (PDFQx-T):[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) showed a rough, inhomogeneous and largely phase-separated surface morphology compared to a typical film with ～100 nm thickness. A similar trend was observed in the surface morphology of a poly(2,2′-bithiophene-alt-(2,3-bis(3,4-bis(octyloxy)phenyl)-6,7-difluoroquinoxaline)) (PDFQx-2T) blend film, showing deteriorated photovoltaic properties with increasing film thickness. In contrast, poly(2,2′:5′,2′′-terthiophene-alt-2,3-bis(3,4-bis(octyloxy)phenyl)-6,7-difluoroquinoxaline) (PDFQx-3T) had a similar blend film morphology for both thick and thin active layers, showing a homogeneous and smooth morphology with a face-on orientation and tight π-π stacking (d-spacing = 3.6 ?). The optimized photovoltaic cell based on PDFQx-3T:PC71BM achieved a power conversion efficiency (PCE) of 8% with an open-circuit voltage of 0.74 V, a short-circuit current of 17.19 mA cm-2 and a fill factor of 0.63 at an active layer thickness of ～270 nm. It is still a challenge to develop photovoltaic polymers which allow efficient charge transport and extraction at a device thickness of ～300 nm. Fine-adjustment of intra- and interchain interactions must be considered carefully to achieve high device properties for thick devices without deterioration in the blend morphology and charge recombination. This high PCE at an active layer thickness of ～300 nm may suggest great potential for the mass production of printed polymer solar cells via industrial solution processes.
2,1,3-Benzothiadiazole-based fluorophores. Synthesis, electrochemical, thermal and photophysical characterization
Frizon, Tiago Elias Allievi,Valdivia Martínez, Julio César,Westrup, José Luiz,Duarte, Rodrigo da Costa,Zapp, Eduardo,Domiciano, Kelvin Guessi,Rodembusch, Fabiano Severo,Dal-Bó, Alexandre Gon?alves
, p. 26 - 35 (2016/09/07)
Three photoactive compounds with π-extended conjugation based on the 2,1,3-benzothiadiazole unit were synthesized and characterized. The compounds exhibited absorption in the violet-blue region with molar absorptivity coefficients and radiative rate constants arising from spin and symmetry allowed 1ππ* electronic transitions. An emission located in the green region with a large Stokes shift was observed, which was most likely due to a charge-transfer mechanism in the excited state. In spin-coated films a dependence on the fluorescence emission intensity with the size of the alkoxy chain could be observed, where an effective non-radiactive channel seems to be present to deactivate the excited state. The thermal properties were analyzed by differential scanning calorimetry (DSC), and all final compounds exhibited a similar behavior with a crystal-isotropic liquid transition during the heating scan and isotropic liquid-crystal transition during the cooling process. Thermogravimetric analysis indicated a main thermal event with an initial decomposition temperature that was higher than 340?°C. The electrochemical characterization indicate that the compounds exhibited a reversible peak at ?1.48?V and an irreversible oxidation process at 0.94?V versus Ag/Ag+. The electrochemical band gap was calculated to be approximately 2.30?eV versus NHE. The spectroelectrochemical measurements demonstrated changes in the absorption spectra due to changes in the electronic structure of the conjugated molecules under oxidative and reductive potentials.
