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
Synthesis and characterization of Y-type polymers for second-order nonlinear optical applications
Balakrishna Kolli,Sarada P. Mishra,Akshaya K. Palai,Tapan Kanai,Mukesh P. Joshi,S. Raj Mohan,T. S. Dhami,Lalit M. Kukreja,Asit B. Samui +8 more
TL;DR: In this paper, a series of dicyanomethylene-substituted polymers having Y-type molecular architecture were synthesized by Knoevenagel condensation reaction.
Journal ArticleDOI
Conformationally Flexible Dendronized Cyclotetraveratrylene (CTTV) Self-Organize a Large Diversity of Chiral Columnar, Frank-Kasper and Quasicrystal Phases
TL;DR: In this paper , the conformationally flexible monodisperse tetramer of veratrole, known as cyclotetraveratrylene (CTTV), was used as an apex model to compare with the less flexible corresponding trimer known as CTV and with the rigid triphenylene (Tp) and 1,3,5-trihydroxybenzene (THB) when dendronized with libraries of self-assembling dendrons and with n-alkyl groups.
Electrostatic Interactions in Coarse-Grained Simulations : Implementations and Applications
TL;DR: In this paper, the mass, number and electron density distributions of 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM) ionic liquid (IL) have been studied on a neutral hydrophobic graphene surface, and at the IL-vacuum interface using atomistic molecular dynamics simulations.
Journal ArticleDOI
Phase behavior and photo‐responsive studies of photoactive liquid crystalline hyperbranched polyethers containing benzylidene moiety
V. Srinivasa Rao,A. B. Samui +1 more
TL;DR: In this article, two sets of hyperbranched polyether epoxies were synthesized to study the effect of substituent, rigidity, and nature of photoactive unit on the thermal and photoresponsive properties.
Journal ArticleDOI
Long-range single domain array of a 5 nm pattern of supramolecules via solvent annealing in a double-sandwich cell
TL;DR: A new solvent-annealing method using a double-sandwich confinement to promote the formation of a large-area, single-domain array of supramolecular cylinders with a small feature size, of critical importance in providing a new bottom-up lithographic method based on supramolescular self-assembly.
References
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Journal ArticleDOI
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.