- Replacing Alkyl with Oligo(ethylene glycol) as Side Chains of Conjugated Polymers for Close π-π Stacking
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We synthesize and systematically study a series of conjugated polymers with oligo(ethylene glycol) (OEG) or alkyl chain as the side chain and poly[2,7-fluorene-alt-5,5-(4,7-di-2-thienyl-2,1,3-benzothiadiazole)] as the polymer backbone. Replacing alkyl chain with OEG chain can decrease the π-π stacking distance of polymer backbone in thin film from 0.44 to 0.41 nm because OEG chain is more flexible than alkyl chain. As the result, the conjugated polymer with OEG side chain exhibits higher hole mobility, red-shifted absorption spectrum in thin film and smaller bandgap than those of the conjugated polymer with alkyl side chain. With the increase of the length of OEG side chain, the resulting conjugated polymers exhibit unchanged π-π stacking distance and decreased hole mobility. Moreover, owing to the large polarity of OEG chain, OEG side chain makes the conjugated polymer suitable for polymer solar cell (PSC) devices processed with polar nonhalogenated solvent, methoxybenzene. A power conversion efficiency of 4.04% is demonstrated with the resulting PSC devices. This work provides the new insight into the effect of OEG side chain on conjugated polymer, which can be used in the molecular design of novel conjugated polymer materials with excellent optoelectronic device performance. (Chemical Equation Presented).
- Meng, Bin,Song, Haiyang,Chen, Xingxing,Xie, Zhiyuan,Liu, Jun,Wang, Lixiang
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Read Online
- SEMICONDUCTING COMPOSITIONS COMPRISING SEMICONDUCTING POLYMERS
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A semiconducting composition comprising a semiconducting polymer and a semiconducting non-polymeric polycyclic compound, wherein the semiconducting polymer comprises units of A and/or B: wherein R1, R2, R5, R6, R7, R8, x, y, p, q, r, R3, R4, R9, R10 and R11 have any of the meanings defined in the description.
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Paragraph 0597-0600
(2019/05/15)
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- Fluorene derivative and use thereof
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Provided is the fluorene derivative represented in formula (1). (In the formula, R1 and/or R2 represents an alkoxy group, an alkenyloxy group, an alkynyloxy group, an aryloxy group, a heteroaryloxy group or an alkyl group that includes at least one ether structure, R3 and R4 represent a prescribed substituent, n1 and n2 are integers 0-3, and Ar1 and Ar2 represent a prescribed nitrogen-containing group.)
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Paragraph 0117; 0118
(2016/11/21)
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- Design, synthesis and redox properties of a fluorene platform linking two different Bodipy dyes
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Several new fluorophores have been prepared by grafting boradiazaindacene (red absorbing) and/or styrylboradiazaindacene (blue absorbing) units as terminal energy acceptors onto a fluorene-derived platform. In one case, an amino-bis(bipyridine) pocket has been attached to enable strong binding of transition metal ions. The stepwise syntheses were largely based on Pd-catalysed cross-coupling reactions. The electrochemistry of the dyes has been analysed by reference to the properties of the various synthetic intermediates, protonation of the tertiary amine site present in the bis(bipyridine) species enabling processes involving this centre to be distinguished from those associated with the boradiazaindacene (Bodipy) unit.
- Bura, Thomas,Ziessel, Raymond
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scheme or table
p. 2875 - 2879
(2010/06/13)
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- Molecular engineering of photoremovable protecting groups for two-photon uncaging
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(Chemical Equation Presented) Open the cage: Symmetrical photoremovable bis-glutamate cages have been designed, synthesized, and characterized that can release a neurotransmitter with unprecedented two-photon efficiencies (see picture), up to 5 GM for BNSF-Glu (BNSF=2,7-bis-{4-nitro-8-[3-(2-propyl)-styryl] }-9,9-bis-[1-(3,6-dioxaheptyl)]-fluorene) at 800 nm, the optimal window both for tissue transparency and classically available laser sources.
- Gug, Sylvestre,Bolze, Frederic,Specht, Alexandre,Bourgogne, Cyril,Goeldner, Maurice,Nicoud, Jean-Francois
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supporting information; experimental part
p. 9525 - 9529
(2009/05/06)
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- Electron transport agents for organic electronic devices
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Compounds and compositions are provided that can be used as electron transport agents in organic electronic devices such as organic electroluminescent devices. The compounds are non-polymeric and have an aromatic core conjugated to end capping groups. The aromatic core contains a phenylene group arylene or naphthalene group arylene having a pendant heteroaryl group that includes a —C═N— unit.
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- Electroactive polymers
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Electroactive polymeric arylenes and intermediates useful for making such polymers are disclosed. The present invention also provides electroactive compositions comprising the electroactive polymeric arylenes, organic electronic devices which comprise these polymers and compositions, and methods of fabricating these devices.
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Page/Page column 92
(2008/06/13)
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