Alkyl side chain driven tunable red-yellow-green emission: Investigation on the new π-conjugated polymers comprising of 2,7-carbazole unit and 2,1,3-benzo-thiadiazole units with different side chains

2007 ◽  
Vol 46 (4) ◽  
pp. 1376-1387 ◽  
Author(s):  
Junping Du ◽  
Erjian Xu ◽  
Hongliang Zhong ◽  
Feng Yu ◽  
Chang Liu ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Green Emission ◽  
Side Chain ◽  
Side Chains ◽  
Alkyl Side Chain

Synergy strategy to the flexible alkyl and chloride side-chain engineered quinoxaline-based D–A conjugated polymers for efficient non-fullerene polymer solar cells

2021 ◽  
Author(s):  
Liang Zeng ◽  
Ruijie Ma ◽  
Qiang Zhang ◽  
Tao Liu ◽  
Yiqun Xiao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Conjugated Polymers ◽  
Halogen Atom ◽  
Polymer Solar Cells ◽  
Fine Tuning ◽  
Side Chain ◽  
Side Chains

We are developing both copolymers with quinoxaline (Qx) as acceptor units by fine tuning the side chains with halogen atom chlorine (Cl) and flexible alkyl engineering for efficient non-fullerene polymer solar cells.

scholarly journals Controlled steric selectivity in molecular doping towards closest-packed supramolecular conductors

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Shinya Kohno ◽  
Yu Yamashita ◽  
Naotaka Kasuya ◽  
Tsubasa Mikie ◽  
Itaru Osaka ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Steric Effects ◽  
Side Chain ◽  
Side Chains ◽  
Void Space ◽  
Alkyl Side Chains ◽  
Recent Developments ◽  
High Carrier ◽  
Molecular Doping ◽  
Steric Selectivity

Abstract Recent developments in molecular doping technologies allow extremely high carrier densities in polymeric semiconductors, exhibiting great diversity because of the unique size, conformation, and steric effect of molecular dopants. However, it is controversial how steric effects can limit the doping efficiency and to what extent dopants can be accommodated in polymers. Here, we employ two distinct conjugated polymers with different alkyl side-chain densities, where polymers are doped via anion-change, allowing greater variation in the incorporation of molecular dopants having different electrostatic potentials and shapes. We characterize the doping efficiency with regard to steric effects, considering the unique void space in the conjugated polymers. Our study reveals that doping efficiency of polymers with sparse alkyl side-chains is significantly greater than that with dense side-chains. A closest-packed supramolecule is realized with a particular combination of a sparse polymer and a large dopant, giving rise to high conductivity, air stability, and remarkably high work function. This work provides a critical insight into overcoming steric effects in molecular doping.

n-Alkylresorcinol Occurrence in Mercurialis perennis L. (Euphorbiaceae)

2010 ◽  
Vol 65 (3-4) ◽  
pp. 174-179 ◽  
Author(s):  
Peter Lorenz ◽  
Matthias Knödler ◽  
Julia Bertrams ◽  
Melanie Berger ◽  
Ulrich Meyer ◽  
...  
Keyword(s):  
Side Chain ◽  
Side Chains ◽  
Alkyl Side Chain ◽  
Alkyl Side Chains ◽  
Chain Lengths ◽  
New View

Investigation of the dichloromethane extracts from herbal and root parts of Mercurialis perennis L. afforded a mixture of 11 homologous n-alkylresorcinols (ARs) with saturated odd-numbered alkyl side chains (C15:0-C27:0). In addition to three predominant ARs (C19:0, C21:0 and C23:0), a number of minor ARs were identified by use of LC-MS/MS and GC-MS techniques. Among the compounds detected, four uncommon ARs with evennumbered alkyl side chain lengths were also determined. The overall AR concentration in herbal parts was 7 to 9 times higher compared to that of the roots. The results presented may open a new view on the phytochemistry and pharmacognosy of M. perennis and other members of the Euphorbiaceae family.

Low band gap conjugated polymers combining siloxane-terminated side chains and alkyl side chains: side-chain engineering achieving a large active layer processing window for PCE > 10% in polymer solar cells

2017 ◽  
Vol 5 (33) ◽  
pp. 17619-17631 ◽  
Author(s):  
Xuncheng Liu ◽  
Li Nian ◽  
Ke Gao ◽  
Lianjie Zhang ◽  
Lechi Qing ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Active Layer ◽  
Polymer Solar Cells ◽  
Hole Transport ◽  
Random Copolymers ◽  
Side Chain ◽  
Active Layer Thickness ◽  
Side Chains ◽  
Alkyl Side Chains ◽  
Thickness Tolerance

Side-chain random copolymers show high 3-D hole transport and offer excellent active layer thickness tolerance.

Impact of the alkyl side chain position on the photovoltaic properties of solution-processable organic molecule donor materials

2016 ◽  
Vol 4 (30) ◽  
pp. 11747-11753 ◽  
Author(s):  
J. Zhang ◽  
X. W. Zhu ◽  
C. He ◽  
H. J. Bin ◽  
L. W. Xue ◽  
...  
Keyword(s):  
Organic Molecule ◽  
Side Chain ◽  
Side Chains ◽  
Alkyl Side Chain ◽  
Photovoltaic Properties ◽  
Alkyl Side Chains ◽  
Solution Processable ◽  
New Compounds

Two new compounds with alkyl side chains at different positions have a similar structure, but exhibit different photovoltaic properties.

Synthèse d'isoxazoles substitués en α de l'azote par une chaine alkyle ou alcényle

1990 ◽  
Vol 68 (8) ◽  
pp. 1271-1276 ◽  
Author(s):  
Jean-Claude Cherton ◽  
Marc Lanson ◽  
Daïf Ladjama ◽  
Yvette Guichon ◽  
Jean-Jacques Basselier
Keyword(s):  
Vinyl Acetate ◽  
Nitrile Oxide ◽  
Side Chain ◽  
Dipolar Cycloaddition ◽  
Side Chains ◽  
Alkyl Side Chain ◽  
Magnesium Compounds ◽  
Convenient Route ◽  
General Method ◽  
Convenient Access

Several syntheses of special isoxazoles bearing a long alkyl or alkenyl side chain in the α position of the nitrogen are presented. A very convenient route in the case of an alkyl side chain is the classical 1,3-dipolar cycloaddition of a nitrile-oxide to a vinyl acetate. Although it is a rather long approach, the reaction of hydroxylamine with enone-epoxides represents a new and unequivocal method compatible with alkenyl side chains. The isomerisation of the easily synthesized isoxazoles bearing such substitutents α to the oxygen, by the reaction of their isoxazolium salts with hydroxylamine, is a fast and general method. Another very convenient access to "α-N substituted" isoxazoles is the coupling of magnesium compounds with 3-bromomethyl 5-methyl isoxazole. Keywords: isoxazoles, substitution in the α position of nitrogen.

Effects of conformational symmetry in conjugated side chains on intermolecular packing of conjugated polymers and photovoltaic properties

RSC Advances ◽  
2015 ◽  
Vol 5 (128) ◽  
pp. 106044-106052 ◽  
Author(s):  
Jisoo Shin ◽  
Min Kim ◽  
Jaewon Lee ◽  
Donghun Sin ◽  
Heung Gyu Kim ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Conjugated Polymers ◽  
Carrier Mobility ◽  
Light Harvesting ◽  
Charge Carrier Mobility ◽  
Polymer Chains ◽  
Side Chain ◽  
Side Chains ◽  
Photovoltaic Properties

Introduction of the symmetric conjugated side chain to the conjugated backbone of the polymer was found to improve both the light-harvesting ability of the polymer and its charge carrier mobility, apparently by increasing the packing between the polymer chains.

A stability study of polymer solar cells using conjugated polymers with different donor or acceptor side chain patterns

2016 ◽  
Vol 4 (42) ◽  
pp. 16677-16689 ◽  
Author(s):  
Ilona M. Heckler ◽  
Jurgen Kesters ◽  
Maxime Defour ◽  
Huguette Penxten ◽  
Bruno Van Mele ◽  
...  
Keyword(s):  
Solar Cells ◽  
Conjugated Polymers ◽  
Polymer Solar Cells ◽  
Stability Study ◽  
Side Chain ◽  
Side Chains ◽  
Acceptor Side ◽  
Donor Acceptor

The position and nature of side chains in the donor–acceptor copolymer were investigated in terms of stability in polymer solar cells.

Tailoring the microstructure and charge transport in conjugated polymers by alkyl side-chain engineering

2016 ◽  
Vol 4 (2) ◽  
pp. 286-294 ◽  
Author(s):  
Sadiara Fall ◽  
Laure Biniek ◽  
Yaroslav Odarchenko ◽  
Denis V. Anokhin ◽  
Grégoire de Tournadre ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Charge Transport ◽  
Electronic Energy ◽  
Side Chain ◽  
Alkyl Side Chain ◽  
Transport Measurements ◽  
Energy Disorder

Transport measurements with in-situ XRD reveal low alkyl side-chain densities to induce an ordered helicoidal conformation with large electronic energy disorder.

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