Three different pi-conjugated oligomers (a blue-emitting oligofluorene, a green-emitting oligo(phenylene vinylene), and red-emitting perylene bisimide) have been functionalized with self-complementary quadruple hydrogen bonding ureidopyrimidinone (UPy) units at both ends. The molecules self-assemble in solution the bulk, forming supramolecular polymers. When mixed together solution, random noncovalent copolymers are formed that contain all three types of chromophores, resulting energy...

Abstract The rapid growth of wearables has created a demand for lightweight, elastic and conformal energy harvesting storage devices. conducting polymer poly(3,4-ethylenedioxythiophene) shown great promise thermoelectric generators, however, the thick layers pristine required effective are too hard brittle seamless integration into wearables. Poly(3,4-ethylenedioxythiophene)-elastomer composites have been developed to improve its mechanical properties, although so far without simultaneously...

Conducting polymers have recently been suggested as thermoelectric materials for use in large-area thermogenerators. To help assessing the feasibility of this electrical conductivity and Seebeck coefficient a series heavily doped regioregular poly(3-hexylthiophene) films are measured between 220 370 K. $p$-type chemical doping up to 34% is accompanied by introduction negatively charged counterions, ${\text{PF}}_{6}^{\ensuremath{-}}$. The counterions produce disordered environment within...

The self-assembly of alpha,alpha'-linked sexithiophenes with chiral and achiral penta(ethylene glycol) chains attached at the alpha-positions terminal rings, that is, 2,2':5',2'':5'',2''':5''',2'''':5'''',2'''''-sexithiophene-5,5'''''-dicarboxylic acid-2S)-2-methyl-3,6,9,12,15-pentaoxahexadecyl ester (1) 2,2':5',2'':5'',2''':5'''',2''''':5''''',2'''''-sexithiophene-5,5'''''-dicarboxylic acid-3,6,9,12,15-pentaoxahexadecyl (2), respectively is described. Analysis UV/vis, fluorescence, circular...

Well-defined π-conjugated oligomers play an important role in the field of organic electronics, because their precise chemical structure and conjugation length give rise to well-defined functional properties facilitate control over supramolecular organization. In this review, we present different complementary approaches for molecular assembly into structures on nanoscale, applied oligothiophenes as a typical conjugated system. We consider self-assembly solution, sublimation individual...

We fabricate field-effect transistors (FETs) by depositing a regioregular poly(3-hexylthiophene) (RR-P3HT) active layer via different preparation methods. The solvent used in the polymer film deposition and technique determine microstructure, which ranges from amorphous or granular films to well-defined fibrillar texture. crystalline ordering of RR-P3HT into structures appears lead optimal FET performances, suggesting that fibrils act as efficient “conduits” for charge carrier transport....

Piggy-back porphyrins: The presence of a Lewis base remarkably affects the cooperative self-assembly zinc porphyrins. Driven by susceptibility monomer towards axial ligand, scavenging caused depolymerization porphyrin aggregates, and dilution aggregation re-entrant phase transition. Model predictions were validated experiments.

Extracellular microenvironment is highly dynamic where spatiotemporal regulation of cell‐instructive cues such as matrix topography tightly regulates cellular behavior. Recapitulating changes in stimuli‐responsive materials has become an important strategy regenerative medicine to generate biomaterials which closely mimic the natural microenvironment. Here, light responsive liquid crystal polymer networks are used for their adaptive and programmable nature form hybrid surfaces presenting...

The microscopic morphology of a series substituted fluorene-based conjugated polymers and copolymers are analyzed with tapping-mode atomic force microscopy. Different structures observed depending on the nature substituents. Thin deposits polyfluorenes linear alkyl groups made long fibrils, lateral dimensions order few nanometers; branched or aromatic substituents form homogeneous, featureless films. To understand how polymer chains pack into these structures, comparisons molecular modeling...

We use atomic force microscopy (AFM) with phase detection imaging (PDI) in order to study the surface microdomain morphology of thick (i.e., ca. 2 mm) films triblock copolymers. present here results obtained on a poly(methyl methacrylate)-block-polybutadiene-block-poly(methyl methacrylate) (PMMA-b-PBD-b-PMMA) copolymer prepared by using 1,3-diisopropenylbenzene (DIB)-based difunctional anionic initiator. Our data illustrate interest PDI for elucidation separation block show that studied this...

The synthesis, characterization, and self-assembly in butanol of a series well-defined alpha,alpha'-linked quinqui-, sexi-, septithiophenes substituted, via ester links at their termini, by chiral oligo(ethylene oxide) chains carrying an alpha, beta, delta, epsilon methyl, respectively, are reported. Studies the these molecules using UV/visible absorption, luminescence, circular dichroism spectroscopies reveal, for sexithiophene case, that magnitude observed Cotton effect aggregates...

Regulating the twist: Tunable supramolecular chirality is induced in an achiral helical self-assembly (P, M; see picture) by hydrogen-bonded chiral guest molecules (yellow and purple rods). Chiroptical probing of π-conjugated chromophore reveals mechanistic pathways induction. "Majority rules" "sergeant soldiers" experiments give insight into amplification stacks. Supporting information for this article available on WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z702730_s.pdf or...

Telechelic polymers end-capped or copolymerized with the benzene-1,3,5-tricarboxamide (BTA) moiety lead to supramolecular materials. The intrinsic phase segregation of BTA nanorods an amorphous polymer such as poly(ethylene butylene) results in thermoplastic elastomeric behavior.

Five fluorene-based co-oligomers have been prepared to study their self-assembly in a wide range of concentrations, from dilute solutions the solid state. Subtle changes chemical structures, introduced tune emission colours over entire visible range, induce strong differences aggregation behaviour. Only two fluorescent co-oligomer derivatives self-assemble form soluble fibrils which organogels emerge at higher concentrations. In contrast, other compounds precipitates. Mixed systems exhibit...

Two oligo(p-phenylenevinylene)−peptide hybrid amphiphiles have been synthesized using solid- and liquid-phase strategies. The amphiliphiles are composed of a π-conjugated oligo(p-phenylenevinylene) trimer (OPV) which is coupled at either glycinyl-alanyl-glycinyl-alanyl-glycine (GAGAG) silk-inspired β-sheet or glycinyl-alanyl-asparagyl-prolyl-asparagy-alanyl-alanyl-glycine (GANPNAAG) β-turn forming oligopeptide sequence. solid-phase strategy enables one to use longer peptides if strong acidic...

The synthesis and characterization of solution processable donor–acceptor–donor (D–A–D) based conjugated molecules with varying ratios thiophene as donor (D) benzothiadiazole acceptor (A) are reported. Optical, electrochemical, thermal, morphological organic thin film transistor (OTFT) device properties these materials were investigated. thermal polarized optical microscope analysis indicates that the having higher D/A exhibit both liquid crystalline (LC) OTFT behavior. AFM 3 4 (3T1B 4T1B)...

Highly ordered nanopatterns are obtained at sub-5 nm periodicities by the graphoepitaxial directed self-assembly of monodisperse, oligo(dimethylsiloxane) liquid crystals. These hybrid organic/inorganic crystals high interest for nanopatterning applications due to combination their ultrasmall feature sizes and ability be into highly domains without additional annealing.

Charge transport properties in organic semiconductors depend strongly on molecular order. Here we demonstrate field-effect transistors where drain current flows through a precisely defined array of nanostripes made crystalline and highly ordered molecules. The stripes are fabricated across the channel transistor by stamp-assisted deposition from solution. As solvent evaporates, capillary forces drive solution to form menisci under stamp protrusions. solute precipitates only regions is...

Recent work on an acrylamide-based photopolymer holographic recording medium is presented. The lifetime of recorded gratings improved by the addition cross-linking monomers. Shelf life also improved. effects various constituents photosensitive material are studied to determine optimum composition, and five xanthene dyes compared as possible sensitizers for system. With most sensitive dye concentrations other formulation presented with high sensitivity very diffraction efficiency. new works...

A comparative study on oligo(p-phenylene vinylene) (OPV)-appended porphyrins containing all trans-vinylene (either hydrophilic or lipophilic) amide linkages (lipophilic) is presented. The type of supramolecular arrangement obtained in organic solvents proves to be strongly dependent the nature covalent connection. In case linkages, a J-type intermolecular packing and assemblies are only moderate stability. Conversely, structures from amide-linked system display an H-type stacking enhanced...