- Poly(arylenevinylene)s through Ring-Opening Metathesis Polymerization of an Unsymmetrical Donor-Acceptor Cyclophane
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Reported are well-defined donor-acceptor alternating copolymers prepared using ring-opening metathesis polymerization (ROMP). Unsymmetrical cyclophanedienes comprising electron-donating (4-methoxy-1-(2-ethylhexyl)oxy)benzene (MEH) and electron-accepting b
- Elacqua, Elizabeth,Gregor, Maria
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supporting information
p. 9527 - 9532
(2019/06/24)
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- Synthesis and characterization of MEH-PPV for solar cell application
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POLY [2-methoxy-5-(2'-ethylhexyloxy) - (p - phenylenevinylene)] (MEH-PPV) was prepared via Gilch route. The structures of MEH-PPV were fully confirmed with their respective spectroscopic data using 1H and 13C nuclear magnetic resonan
- Mahmoud,Assem,Shehata,Motaung
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p. 911 - 933
(2017/04/17)
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- Synthesis and properties of poly(p-phenylene vinylene) derivatives with hyperbranched structure and containing a nitro substituent
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In order to improve efficiency, processability, and stability, two groups of novel poly(p-phenylene vinylene) (PPV) derivatives (P1-P 3 and P4-P6) with hyperbranched structure and containing a nitro substituent were synthesized via a Gilch reaction in different monomer ratios. The properties of the polymers were investigated by using UV-Vis absorption, fluorescence spectroscopy, cyclic voltammetry, and thermogravimetric analysis. The result shows that the band gaps of the PPV derivatives with a nitro substituent were decreased and the polymers had higher molecular weights (106), excellent solubility in common organic solvents, good film-forming ability, and better thermal stability. The polymers can be used as an efficient acceptor material in polymeric solar cells. Graphical abstract: [Figure not available: see fulltext.]
- Li, Ruyu,Mo, Yanjiao,Shi, Rong,Li, Peng,Li, Chengyu,Wang, Zhenjiang,Wang, Xun,Li, Shengbiao
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- Chain-length dependent nematic ordering of conjugated polymers in a liquid crystal solvent
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In this communication we demonstrate the dependence of the solute order parameter on the solute molecular weight for polymer solutes dissolved in liquid crystalline solvents. Using ensemble absorption polarization spectroscopy together with single molecul
- Tcherniak, Alexei,Solis Jr., David,Khatua, Saumyakanti,Tangonan, Andrew A.,Lee, T. Randall,Link, Stephan
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supporting information; scheme or table
p. 12262 - 12263
(2009/02/05)
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- Efficient light harvesting by sequential energy transfer across aggregates in polymers of finite conjugational segments with short aliphatic linkages
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Interactions between lumophores have a critical influence on the photophysical properties of conjugated polymers. We synthesized a new series of light-harvesting polymers (poly-DSBs, I-IV) of dialkyloxy- or dialkyl- substituted distyrylbenzene (the substituents being methoxy, 2-ethylhexyloxy, and cyclohexyl) with short aliphatic linkage (methylene or ethylene) and examined the effects of interactions between lumophores and of chemical structures on the absorption, emission, and excitation spectra. The proximity between distyrylbenzene lumophores was shown to be critical to the interactions between lumophores and to the energy-transfer processes. In concentrated solutions and solid films, intermolecular aggregates exist resulting from different extents of interactions between lumophores and are found to involve at least three species: loose, compact, and the most aligned aggregates as observed by photoluminescence and excitation spectroscopies. We also found, for the first time, sequential energy transfer from individual lumophores to the most compact, aligned aggregates via the looser intermolecular aggregates, as observed directly by time-resolved fluorescence spectroscopy. Such a process mimics energy transfer in photosynthesis units and is so efficient such that the fluorescence color can be red-shifted drastically by the presence of comparatively few aggregates and that the light evolved from concentrated solutions and films of poly-DSBs I-IV is entirely or almost the aggregation emission. Although the sequential energy-transfer process in fully conjugated electro-/photoluminescent polymers due to inhomogenity other than distributed conjugation lengths has never been directly observed at room temperature, we suggest that events similar to those observed in poly-DSBs in conjugated polymers could occur but on a much shorter time scale, i.e., a few picoseconds.
- Peng,Chen,Fann
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p. 11388 - 11397
(2007/10/03)
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- A novel series of copolymers containing 2,5-dicyano-1,4- phenylenevinylene - Synthetic tuning of the HOMO and LUMO energy levels of conjugated polymers
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A series of copolymers of 2,5-dicyano-1,4-phenylenevinylene and 2- methoxy-5-(2'-thylhexyloxy)-1,4-phenylenevinylene were synthesized by Wittig reaction. The HOMO and LUMO energy levels of copolymers can be easily tuned by controlling the feed ratio of co
- Xiao,Yu,Chua,Huang
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p. 1318 - 1321
(2007/10/03)
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