Journal ArticleDOI
Self-organization of supramolecular helical dendrimers into complex electronic materials
Virgil Percec,Martin Glodde,Tushar K. Bera,Yoshiko Miura,Irina Shiyanovskaya,Kenneth D. Singer,Venkatachalapathy S. K. Balagurusamy,Paul A. Heiney,Ingo Schnell,Almut Rapp,Hans Wolfgang Spiess,Steven D. Hudson,H. Duan +12 more
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TLDR
This work finds that attaching conducting organic donor or acceptor groups to the apex of the dendrons leads to supramolecular nanometre-scale columns that contain in their cores π-stacks of donors, acceptors or donor–acceptor complexes exhibiting high charge carrier mobilities.Abstract:
The discovery of electrically conducting organic crystals1 and polymers1,2,3,4 has widened the range of potential optoelectronic materials5,6,7,8,9, provided these exhibit sufficiently high charge carrier mobilities6,7,8,9,10 and are easy to make and process. Organic single crystals have high charge carrier mobilities but are usually impractical11, whereas polymers have good processability but low mobilities1,12. Liquid crystals exhibit mobilities approaching those of single crystals and are suitable for applications13,14,15,16,17,18, but demanding fabrication and processing methods limit their use. Here we show that the self-assembly of fluorinated tapered dendrons can drive the formation of supramolecular liquid crystals with promising optoelectronic properties from a wide range of organic materials. We find that attaching conducting organic donor or acceptor groups to the apex of the dendrons leads to supramolecular nanometre-scale columns that contain in their cores π-stacks of donors, acceptors or donor–acceptor complexes exhibiting high charge carrier mobilities. When we use functionalized dendrons and amorphous polymers carrying compatible side groups, these co-assemble so that the polymer is incorporated in the centre of the columns through donor–acceptor interactions and exhibits enhanced charge carrier mobilities. We anticipate that this simple and versatile strategy for producing conductive π-stacks of aromatic groups, surrounded by helical dendrons, will lead to a new class of supramolecular materials suitable for electronic and optoelectronic applications.read more
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Journal ArticleDOI
Tetragonally Perforated Layer Structure via Columnar Ordering of 4′-(3,4,5-Trioctyloxybenzoyloxy)benzoic Acid in a Supramolecular Complex with Polystyrene-block-Poly(4-vinylpyridine)
TL;DR: When a symmetrical diblock copolymer of poly(styrene)-block poly(4-vinylpyridine) (PS-b-P4VP) is densely hydrogen-bonded with wedge-like nonmesogens of 4′-(3,4,5-trioctyloxybenzoyloxy)benzoic acid (TOB), the supramolecular complex thus formed can self-assemble into a hierarchical structure of tetragonal perforation layers (TPL) within ordered hexagonal columnar liquid-cry
Journal ArticleDOI
Liquid-crystalline methanofullerodendrimers which display columnar mesomorphism
TL;DR: In this paper, the second and third generation poly(benzyl ether) dendrons were selected as liquid-crystalline promoters to induce columnar mesomorphism.
Journal ArticleDOI
Variation of Helical Twisting Power in Self-Assembled Sugar-Appended Schiff Base Chiral Rod−Coil Amphiphiles
TL;DR: A series of sugar-appended Schiff base chiral rod-coil amphiphiles with various alkoxy chain lengths have been synthesized in order to elucidate the variation of the helical twisting power (HTP).
Journal ArticleDOI
Discotic columnar liquid-crystalline polymer semiconducting materials with high charge-carrier mobility via rational macromolecular engineering
TL;DR: In this paper, a group of butoxy-substituted triphenylene (TP)-based side-chain Discotic Liquid Crystal (DLC) polymers have been prepared by reversible addition fragmentation chain transfer (RAFT) polymerization via rational macromolecular engineering with particular emphasis on the effects of spacer length and molecular weight.
Journal ArticleDOI
Anion–Dipole Interactions Make the Homopolymers Self‐Assemble into Multiple Nanostructures
TL;DR: It is reported that anion-dipole interactions can enable a number of homopolymers to achieve a variety of self-assembly behaviors in aqueous solution.
References
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Two-dimensional charge transport in self-organized, high-mobility conjugated polymers
Henning Sirringhaus,Peter J. Brown,Richard H. Friend,Martin Nielsen,Klaus Bechgaard,B.M.W. Langeveld-Voss,A. J. H. Spiering,René A. J. Janssen,E. W. Meijer,P. T. Herwig,Dago M. de Leeuw +10 more
TL;DR: In this article, the authors used thin-film, field effect transistor structures to probe the transport properties of the ordered microcrystalline domains in the conjugated polymer poly(3-hexylthiophene), P3HT.
Journal ArticleDOI
Selective recognition of methylated lysine 9 on histone H3 by the HP1 chromo domain.
Andrew J. Bannister,Philip Zegerman,Janet F. Partridge,Eric A. Miska,Jean O. Thomas,Robin C. Allshire,Tony Kouzarides +6 more
TL;DR: A stepwise model for the formation of a transcriptionally silent heterochromatin is provided: SUV39H1 places a ‘methyl marker’ on histone H3, which is then recognized by HP1 through its chromo domain, which may also explain the stable inheritance of theheterochromatic state.
Journal ArticleDOI
Regulation of chromatin structure by site-specific histone H3 methyltransferases
Stephen Rea,Frank Eisenhaber,Dónal O'Carroll,Brian D. Strahl,Zu-Wen Sun,Manfred Schmid,Susanne Opravil,Karl Mechtler,Chris P. Ponting,C D Allis,Thomas Jenuwein +10 more
TL;DR: A functional interdependence of site-specific H3 tail modifications is revealed and a dynamic mechanism for the regulation of higher-order chromatin is suggested.
Journal ArticleDOI
Integrated Optoelectronic Devices Based on Conjugated Polymers
TL;DR: An all-polymer semiconductor integrated device is demonstrated with a high-mobility conjugated polymer field-effect transistor driving a polymer light-emitting diode (LED) of similar size, which represents a step toward all- polymer optoelectronic integrated circuits such as active-matrix polymer LED displays.
Journal ArticleDOI
Self-Organized Discotic Liquid Crystals for High-Efficiency Organic Photovoltaics
Lukas Schmidt-Mende,Andreas Fechtenkötter,Klaus Müllen,Ellen Moons,Richard H. Friend,J. D. MacKenzie +5 more
TL;DR: Self-organization of liquid crystalline and crystalline-conjugated materials has been used to create, directly from solution, thin films with structures optimized for use in photodiodes, demonstrating that complex structures can be engineered from novel materials by means of simple solution-processing steps and may enable inexpensive, high-performance, thin-film photovoltaic technology.