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Relevant academic research and scientific papers

Efficient preparation of stereopure amphiphilic 1,2-amino alcohols by using preparative enantioselective HPLC

Chiral amphiphiles are useful for controlling the structures and properties of supramolecular assemblies, but their stereocontrolled synthesis is generally difficult, because their long alkyl chains tend to bring unfavorable effects on the solubility, rea

Synthesis and Liquid Crystalline Self-Assembly of Concave Diindoles with a Hydropentalene Core

Fischer indole reaction of Weiss diketone with 4-bromophenylhydrazine provided the 2,8-dibromo-hexahydropentaleno[2,1-b:5,4-b’]diindole key intermediate, which was converted to the target compounds by N-protection/Suzuki cross-coupling. Variation of prote

Synthesis, mesomorphism, photophysics and device performance of liquid-crystalline pincer complexes of gold(iii)

Emissive gold(iii) complexes of pincer 2,6-diphenylpyridines also bearing a phenylacetylide ligand have been modified at both the pincer and phenylacetylide to confer liquid crystalline properties, with most complexes showing a columnar hexagonal phase in

Triphenylamine- And triazine-containing hydrogen bonded complexes: liquid crystalline supramolecular semiconductors

Despite the fact that triphenylamine derivatives have been widely explored as hole-transporting materials, studies on charge transport properties in the liquid crystal phase have been overlooked. Here, it is reported that triphenylamine liquid crystals can attain very high hole mobility values in a hexagonal columnar mesophase, up toμ≈ 5 cm2V?1s?1. The columnar liquid crystalline phase was obtained by a proper design of a supramolecular mesogen, and this is unprecedented for triphenylamine liquid crystals. In fact, the supramolecules were formed by hydrogen-bonded 1?:?3 complexes of a star-shaped triazine core and three triphenylamine peripheral units. The resulting hexagonal columnar mesophase acts as a successful scaffold that confines TPA units at the periphery of columns. Challenging DFT theoretical investigations into a model based on such supramolecular systems involving a large number of atoms were undertaken to explore the stability and geometry of the complexes and their electronic properties.

The liquid crystal Click procedure for oligothiophene-Tethered phthalocyanines-self-Assembly, alignment and photocurrent

A series of star-shaped liquid crystals (LCs) with a phthalocyanine donor core, oligothiophene antennae and fullerene acceptors have been successfully prepared. This hierarchical self-Assembly results in a nanosegregated helical donor-Acceptor-Antennae LC-system promoted by the recently discovered Click procedure. This model system reveals all photophysical prerequisites for energy conversion, charge generation and transport. Uniform amorphous thin films of 150 nm could be produced by bar-coating. Annealing did not only induce the formation of columns via the Click procedure but also partially homeotropically aligned the non-clearing sample in a sandwich geometry (ITO and Ag/MoO3). This has been confirmed by microscopic studies and the measurement of photocurrent, which increased by a factor of 300 after the annealing step.

USE OF A SUBSTITUTED OR UNSUBSTITUTED POLYCYCLIC AROMATIC HYDROCARBON COMPOUND FOR HIGH-RESOLUTION MICROSCOPY

The present invention relates to the use of a compound in single-molecule localization microscopy (SMLM), in stimulated emission depletion microscopy (STED), in minimal emission fluxes microscopy (MINFLUX) or in structured illumination and localization microscopy (SIMFLUX), wherein the compound is a substituted or unsubstituted polycyclic aromatic hydrocarbon comprising six or more substituted and/or unsubstituted aromatic hydrocarbon rings, wherein each of at least six of the six or more substituted and/or unsubstituted aromatic hydrocarbon rings is fused with at least another one of the at least six substituted and/or unsubstituted aromatic hydrocarbon rings.

Liquid crystals from shape-persistent porphyrin stars with intrinsic free space

A small library of shape-persistent, conjugated star-shaped liquid crystals (LCs) with a zinc porphyrin core was successfully synthesized. Different conjugated arms are attached in themeso-positions. The self-assembly is at the limit between liquid crystals and soft crystal phases owing to the space-filling requirement. A model indicates the formation of dimers in double helices. A remarkable mesogen with thiophene linked directly to the porphyrin core generates J-aggregates in solution, which persist in the solid state. In the liquid crystal the J-aggregates disappear but can be reversibly reobtained by solvent treatment.

Columnar Iridium(III) Metallomesogens Based on Polycatenar Pyridyltetrazolate with Ambipolar Carrier Mobility Behavior

In this paper, we have designed and synthesized a series of neutral liquid-crystalline iridium(III) complexes based on polycatenar 2,5-diphenylpyridine and pyridyltetrazolate derivatives. Iridium(III) complexes all display highly emissive behavior with photoluminescence quantum yields in the range of 0.45-0.66 and a maximum emission wavelength at ～563 nm. Hexagonal columnar mesophases of iridium(III) complexes can be obtained by changing the number and length of peripheral alkoxyl chains attached to a 2,5-diphenylpyridine ligand (main ligand) and a pyridyltetrazolate ligand (auxiliary ligand). Moreover, experimental results of the charge transport properties for these iridium(III) complexes, which were measured by the space charge limited-current method, exhibit ambipolar carrier mobility behavior. In particular, the liquid-crystalline iridium(III) complexes can self-organize into one-dimensional (1D) nanostructure after thermal annealing treatment in their liquid-crystalline phase. The devices based on liquid crystal film display improved charge transport behavior compared with that of the devices based on polycrystalline film, indicating 1D nanostructure is beneficial to charge carrier injection and transportation.

Tuning the Magnetic Properties of Columnar Benzo[e][1,2,4]triazin-4-yls with the Molecular Shape

A homologous series of disc-like 1,3,6-trisubstituted benzo[e][1,2,4]triazin-4-yls 1[n] was synthesized and their structural, thermal, optical, magnetic, and electric properties were investigated. The results demonstrate that all members of the series dis

Tetradentate platinum(II) complexes: Synthesis, photophysical properties, liquid crystalline characteristics and charge transport behaviour

Three new tetradentate phosphorescent Pt(II) complexes (Pt6, Pt12 and Pt16) with half-disc molecule structure were designed and synthesized, which are based on tetradentate ligands with six alkoxyl chains on the periphery,