Abstract An elastic organic crystal of a π‐conjugated molecule has been fabricated. A large fluorescent single 1,4‐bis[2‐(4‐methylthienyl)]‐2,3,5,6‐tetrafluorobenzene (over 1 cm long) exhibited fibril lamella morphology based on slip‐stacked molecular wires, and it was found to be remarkably crystalline material. The straight capable bending more than 180° under applied stress then quickly reverted its original shape upon relaxation. In addition, the fluorescence quantum yield about twice...

Abstract An elastic organic crystal of a π‐conjugated molecule has been fabricated. A large fluorescent single 1,4‐bis[2‐(4‐methylthienyl)]‐2,3,5,6‐tetrafluorobenzene (over 1 cm long) exhibited fibril lamella morphology based on slip‐stacked molecular wires, and it was found to be remarkably crystalline material. The straight capable bending more than 180° under applied stress then quickly reverted its original shape upon relaxation. In addition, the fluorescence quantum yield about twice...

Abstract Mechanically induced shaping (i.e., top‐down processing) of organic single crystals is an undeveloped area research because applying stress to such nonflexible crystalline materials generally causes them disintegrate. Herein, we present a mechanically splitting phenomenon elastic crystals, and study on facile processing method centimeter‐scale crystal fluorescent π‐conjugated molecule into various fine fibers (thickness: ≈50 μm; width: ≈150 length: ≈25 mm). The produced maintained...

Commercially available 4,7-dibromo-2,1,3-benzothiadiazole can be used as a building block for the organic synthesis of high performance optoelectronics devices. Herein, we report that single crystal displays elastic bending flexibility and crystalline-state fluorescence. A large needle-shaped (over 1 cm long) exhibited fibril lamella type structure based on slip-stacked (J-aggregated) molecular wires. The was capable under applied stress quickly reverts to its original shape upon relaxation....

Organic single crystals with elastic bending flexibility are rare because they generally brittle. We report here fluorescent organic based on thiophene-tetrafluorobenzene-thiophene derivatives, mainly 1,4-bis(thien-2-yl)-2,3,5,6-tetrafluorobenzene. Three derivatives were synthesized by Pd-catalyzed cross-coupling reactions (Stille or direct arylation pathways). The crystallization of the gave large (mm- cm-scale) crystals. Two 1,4-bis(thien-2-yl)-2,3,5,6-tetrafluorobenzene, 1, and...

We have successfully developed an efficient and regioselective direct arylation polycondensation of thiophenes using Pd/C heterogeneous catalysts.

We have successfully demonstrated a chloride-promoted Pd-catalyzed phosphine-free direct C–H arylation for highly efficient synthesis of high molecular weight π-conjugated polymers.

Absolute molecular weight values obtained by gel permeation chromatography with multi angle light scattering of PEDOTF8 were approximately 65% the relative using polystyrene standards. Both absorption and measurements showed effective conjugation lengths (absolute <2600, <4000, number EDOT-F8 units: n < ca. 5 unit). The low polymers higher energy fluorescence bands. Molecular also affected electrochemical process polymer films. high (number average >70000) a redox stability than one. two...

Abstract Enzymatic catalysis is an ecofriendly strategy for the production of high‐value low‐molecular‐weight aromatic compounds from lignin. Although well‐definable monomers have been obtained synthetic lignin‐model dimers, enzymatic‐selective synthesis platform natural lignin has not accomplished. In this study, we successfully achieved highly specific with a phenylpropane structure directly using cascade reaction β‐O‐4‐cleaving bacterial enzymes in one pot. Guaiacylhydroxylpropanone (GHP)...

Lewis acid (BF3)-modification of pyridine-based conjugated polymer films and their solid-state NMR characterization has successfully been demonstrated. We also achieved "halochromism" macroscopic gradation patterning the films.

A donor–acceptor type benzodiazaborole-based conjugated polymer, which shows charge transfer character, was successfully synthesized by electropolymerization.

Abstract To identify the simplest organic structure for an emitter, we focused on 2,5‐dimethoxybenzene‐1,4‐dicarboaldehyde. This symmetric molecule has a very low molecular weight (MW=194), single benzene unit, and consists of only three elements (H, C O). It forms highly efficient pure emitting crystals (λem=499 nm, Φ F =0.42, FWHM=42 nm) due to rigid based framework four intramolecular hydrogen bonds between electron‐donating methoxy electron‐accepting aldehyde groups. crystal acts as good...

Abstract It was found that oxidation potentials of methanes with π-electron substituents were decreased by introduction a trimethylsilyl group. The anodic benzyl-, allyl-, aryl(or alkyl)thiomethyl-, and aryloxymethyl-substituted trimethylsilanes smoothly proceeded in the presence nucleophiles, e.g. alcohols carboxylic acids, to eliminate groups giving corresponding alkoxylated carboxylated products moderate or high yields without full optimization electrolytic conditions, while...

Making the shift: The title reaction of a propargylic bis(carbonate) with diboron compounds leads to new cross-conjugated polymers 1 having 2,3-butadienylene moieties. is then converted into linear-conjugated 2 through Diels–Alder reaction. fluorescent spectra cis-linked show large Stokes shifts compared those polymer precursors 1.

AB Aquatic Biology Contact the journal Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 16:265-276 (2012) - DOI: https://doi.org/10.3354/ab00448 Monitoring attitude and dynamic acceleration of free-moving aquatic animals using a gyroscope Takuji Noda1,*, Junichi Okuyama1, Takuya Koizumi1, Nobuaki Arai1, Masato Kobayashi2 1Graduate School Informatics, Kyoto University, 606-8501 Kyoto, Japan 2Ishigaki Tropical Station,...

ABSTRACT In this study, we report the synthesis of π‐conjugated network polymers including unique fluorescent units via palladium‐catalyzed direct (CH) arylation polycondensation 1,2,4,5‐tetrafluorobenzene with tetrabromoarenes. The obtained polymers, tetraphenylethene (TPE) or pyrene (PYR) units, had microporous structures specific Brunauer–Emmett–Teller (BET) surface areas at 508 and 824 m 2 g −1 , respectively. These possessed narrow pore distributions (&lt;15 nm). analyses supported...

A palladium catalyst immobilized on thiol-modified silica gel (PITS) was developed for the efficient synthesis of various π-conjugated oligomers and polymers. Direct arylation 3,4-ethylenedioxythiophene (EDOT) gave not only corresponding oligomeric compounds in high yields but also high-molecular-weight polymers yields. Moreover, polycondensation β-unprotected bithiophene monomer with dibromoarenes achieved. This solid-supported Pd used to conduct regioselective direct polycondensation,...

Abstract In π‐conjugated polymers (πCPs), crystallinity and fluorescence typically exhibit a trade‐off relationship. Here, we have synthesized highly crystalline fluorescent polymer with simple alternating structure of 1,2,4,5‐tetrafluorophenylene 3,3′‐dihexyl‐2,2′‐bithiophene units. film, the exhibited efficient red‐colored fluorescence, an improved quantum yield (Φ sol =13 %→Φ film =23 %) structure. Interestingly, supramolecular gel formation occurred in appropriate solvents,...

We report here a synthetic route to unsymmetric cyano-substituted oligo(p-phenylene-vinylene)s (COPVs), which have not been reported so far. These molecules were synthesised in high yield through a...

Abstract It was found that anodic oxidation of phenyl trimethylsilylmethyl sulfide in the presence alcohols and carboxylic acids afforded various kinds PTM ethers esters, respectively, good to reasonable yields.

We have demonstrated trifluoroborate-modification of both poly(2,6-pyridine-alt-9,9-dioctylfluorene-2,7-diyl) and poly(4,4′-diphenyl-N-hexylamine-alt-9,9-dioctylfluorene-2,7-diyl) (PPF PAF, respectively) films to tune the electronic interactions mean conjugated lengths in main segments. After BF3–OEt2 vapor treatment, absorption fluorescence spectra PPF film were red-shifted due charge transfer between electron-accepting trifluoroborate-pyridine moiety weak electron-donating...

ABSTRACT We have demonstrated a direct arylation polycondensation of 3,4‐ethylenedioxythiophene with 2,7‐dibromo‐9,9‐dioctylfluorene using palladium on carbon (Pd/C) as catalyst. Pd/C is low‐cost solid‐supported catalyst, giving one the effective catalytic systems for arylation. The Pd/C‐catalyzed acetic acid/potassium carbonate in N,N ‐dimethylacetamide furnished high molecular weight π‐conjugated alternating copolymer EDOT‐fluorene ( M n = 89,300, w / 3.27) yield. EDOT various...