105653-65-4Relevant academic research and scientific papers
Experimental and theoretical studies of 2,5-diphenyl-1,4-distyrylbenzenes with all-cis- And all-trans double bonds: Chemical structure determination and optical properties
Xie, Zengqi,Yang, Bing,Liu, Linlin,Li, Mao,Lin, Dong,Ma, Yuguang,Cheng, Gang,Liu, Shiyong
, p. 962 - 973 (2005)
2,5-Diphenyl-1,4-distyrylbenzene (DPDSB) with all-cis (cw-DPDSB) and all-trans double bonds (trans-DPDSB) were synthesized by Wittig reaction and the differences in structural and optical properties between the cis- and trans-isomers are discussed in detail. Both compounds were fully characterized by NMR spectroscopy, FT-IR spectroscopy, x-ray crystallography, differential scanning calorimetry (DSC) and electrochemical methods. X-ray analysis and molecular simulation revealed that the structure of cis-DPDSB obviously deviates from planarity along both the distyrylbenzene and terphenyl directions, and less intermolecular interaction exists in crystal. The cisisomer shows a large blue shift in the absorption spectrum in comparison with that of the trans-isomer, and cyclic voltammetric measurements give bandgaps of 3.16 and 2.97 eV for cis- and trans-DPDSB, respectively. Both compounds show unusually strong blue fluorescence in the solid state, probably due to the weak intermolecular interaction existing in both isomers owing to the large steric hindrance induced by the substituted phenyl groups. DSC experiments determined that both isomers have excellent thermal stability, which indicates that they can be used as active layers to make stable devices. Quantum chemical calculations for the frontier molecular orbital and the cation and anion properties reveal that the HOMO and LUMO are completely localized in the distyrylbenzene direction and the distyrylbenzene segment has more sensitive electroactivity than the terphenyl segment whether it is cis- or trans-DPDSB. Copyright
Benzo-Fused Perylene Oligomers with up to 13 Linearly Annulated Rings
Yang, Xuan,Rominger, Frank,Mastalerz, Michael
, p. 7941 - 7946 (2021)
The longer acenes with more than six linearly fused six-membered rings are still fascinating chemists and physicists because of their unique photophysical properties and their high potential for organic electronics applications. Unfortunately, with increasing size (seven and more rings) these compounds rapidly lose chemical stability. Besides kinetic and chemical stabilization approaches introducing either bulky or electron-withdrawing groups or both, such systems also have been stabilized by peri-annulation. Although strictly spoken, these peri-annulated compounds are no longer real acenes, they have fascinating properties as well. Herein, we describe the first synthesis of a new series of peri-annulated acenes with up to 13 linearly fused rings, which is unprecedented till date. Furthermore, this new series contains perylene units connected through benzene rings along their [b,k]edges, responsible for unique absorption and emission properties.
Multifunctional polymer nanoparticles: Ultra bright near-infrared fluorescence and strong magnetization and their biological applications
Yan, Lulin,Zhang, Yan,Ji, Guang,Ma, Lian,Chen, Jinlong,Xu, Bin,Tian, Wenjing
, p. 65426 - 65433 (2016)
Multifunctional polymer nanoparticles with great promise for biomedical applications have attracted many attentions. Using an aggregation-enhanced emission (AEE) molecule DPPBPA and magnetic Fe3O4 as the core, and biocompatible polymer Pluronic F-127 as the encapsulation matrix, multifunctional polymer NPs Fe3O4/DPPBPA@F-127 were fabricated by self-assembly procedures. These NPs have bright near-infrared fluorescence λex at 654 nm with a high fluorescence quantum yield of 18.3%, and strong magnetism, and superparamagnetism. With good monodispersity and biocompatibility, the NPs not only can show effective MRI ability, but also can stain in cytoplasm with a strong near-infrared fluorescent signal, as well as little toxicity to living cells, which show a very good prospect in the field of biological applications.
Enhanced performance of bulk heterojunction solar cells using novel alternating phenylenevinylene copolymers of low band gap with cyanovinylene 4-nitrophenyls
Mikroyannidis,Kabanakis,Balraju,Sharma
, p. 5544 - 5553 (2010)
Two novel low band gap soluble copolymers, P1 and P2, were synthesized and characterized. P1 consisted of alternating dihexyloxyphenylene and α-[[4-(diphenylamino) phenyl]methylene]-4-nitro-ben-zeneacetonitrile. P2 consisted of alternating dihexyloxyphenylene and α,α'-[(1,4- phenylene)dimethy-lidyne]bis(αZ,α'Z)-4-nitrobenzeneacetonitrile. These copolymers showed broad absorption curves with long-wavelength absorption maximum around 620 nm and optical band of 1.68 and 1.64 eV for P1 and P2, respectively. Both P1 and P2 were blended with PCBM to study the photovoltaic response of bulk heterojunction (BHJ) solar cells. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels of both P1 and P2 are well aligned with those of PCBM acceptor. This allows efficient photoinduced charge transfer and high open circuit voltage, leading to an overall power conversion efficiency (PCE) of 3.15% and 2.60% for the as cast P1:PCBM-and P2:PCBM-based devices, respectively. The PCE of the devices has been further improved up to 4.06% and 3.35% for the devices based on thermally annealed P1:PCBM and P2:PCBM blends, respectively.
Improved Photoreduction of CO2 with Water by Tuning the Valence Band of Covalent Organic Frameworks
Wang, Lu-jie,Wang, Rui-lei,Zhang, Xiao,Mu, Jing-lin,Zhou, Zi-yan,Su, Zhong-min
, p. 2973 - 2980 (2020)
Porous covalent organic frameworks (COFs), as an emerging material, have the characteristics of high stability, large series of components, easy synthesis, modification, and adjustable amplitude. They have the potential to become good catalysts. Bromine, as a halogen, has attracted intensive interest for the modification of photocatalysts for photocatalytic reactions. It is feasible to enhance the activity and selectivity of the material by facile functionalization of the reticular parent structure′s electron-withdrawing groups. In addition, the conjugation effect of bromine, further delocalizing the electrons of the COF, is beneficial to the progress of many photocatalytic reactions. Reports on the modification of COFs by bromine functional groups to improve the catalytic performance have not been found so far. Here, TAPP [5,10,15,20-tetrakis(4-aminophenyl)porphyrin] and 2,5-dibromo-1,4-benzenedialdehyde instead of terephthalaldehyde were chosen to synthesize a porphyrin-based COF (TAPBB-COF) by the solvothermal method. As expected, the valence band (VB) of TAPBB-COF is thus adjusted to a more suitable position. Additionally, the CO production when using TAPBB-COF under full-wavelength light for 12 h was 295.2 μmol g?1, which was three times that of COF-366, and the new material has good recycling stability and selectivity (95.6 %). Theoretical calculations indicate that the nitrogen of the porphyrin ring and the Schiff base, and the bromine in TAPBB-COF contribute greatly to the activation of H2O and the conversion of CO2 in the photoreaction.
