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Publications (28)
An anisotropic light emitting metallomesogen (PtM) consisting of a cyclometalated platinum(II)–terpyridine (Pt(II)–tpy) chromophore and a flexible dendron is newly synthesized as a thermal‐induced and polarization‐induced solid‐state luminescence switching material. The self‐assembled PtM is uniaxially aligned by mechanical shearing within the meso...
Metallomesogens
In article number 2106559, Kwang‐Un Jeong and co‐workers present a luminescence switching material using cyclometalated Pt(II)‐based metallomesogen. The metallomesogen changes solid‐state emission in response to thermal stimulation and the uniaxially aligned metallomesogen presents linearly polarized photoluminescence. Metallomesoge...
Bandwidth-tunable anisotropic spatial light modulators are fabricated with redox-responsive dichroic mesogens. By in-troducing an ionic group and a polymerizable group into the chromophore, the programmed reactive mesogen (PDI-MA) exhibits a lyotropic chromonic liquid crystal (LCLC) phase. PDI-MA molecule forms a stable aromatic dianion state so th...
Simultaneous manipulation of both transparency and luminescence is one of the biggest challenges in developing security materials and memory devices. To understand the crucial factors influencing such optical properties, we synthesized a new class of a transparent luminescent molecule (mPD) comprising dendritic alkyl chains as a model organic compo...
In article number 1803291, Kwang‐Un Jeong and co‐workers show that hierarchical hybrid nanostructures are constructed by the host‐guest complex between the fullerene dendron and pyrene dendron. Based on the consideration of structural motifs and host‐guest interactions, fullerene and pyrene building blocks are successfully programmed and self‐assem...
The construction of fullerene (C60) hierarchical nanostructures with the help of amphiphilic molecules remains a challenging task in nanoscience and nanotechnology. Utilizing the host–guest complex concept, sub‐10 nm layered superstructures are constructed from a monofunctionalized C60 dendron (C60D, guest) and tweezer‐like pyrene dendron (PD, host...
Pyrene‐based asymmetric liquid crystal dendron (PD) was newly synthesized for understanding the correlation of the kinetically controlled hierarchical superstructure with its properties. Owing to the competition bewteen driving forces, PD formed stable or metastable crystalline phases depending on the cooling rate. Various techniques were utilized...
To understand the relationship between kinetically controlled hierarchical superstructures and photophysical properties, pyrene‐based asymmetric liquid crystal (LC) dendrons (abbreviated as PD) were newly synthesized by covalently attaching a pyrene moiety (P) at a biphenyl‐based LC dendritic group (D). The phase transition behavior of PD has been...
To develop light-triggered wringing gels, an asymmetric macrogelator (1AZ3BP) was newly synthesized by the chemically bridging a photoisomerizable azobenzene (1AZ) molecular machine and a biphenyl-based (3BP) dendron with a 1,4-phenylenediformamide connector. 1AZ3BP was self-assembled into a layered superstructure in the bulk state, but 1AZ3BP form...
To develop an advanced heat transfer composite, a deeper understanding of the interfacial correlation between matrix and filler is of paramount importance. To verify the effect of interfacial correlations on the thermal conductivity, the conductive fillers such as expanded graphite (EG) and boron nitride (BN) are introduced in the discotic liquid c...
The synthesized itaconic acid-based dendritic amphiphile (Ita3C12) monomers and the methacryl polyhedral oligomeric silsesquioxane (MAPOSS) cross-linkers were directly introduced for the construction of automatic vertical alignment (auto-VA) layers in the host nematic liquid crystal (NLC) medium. The auto-VA layer can be stabilized by irradiating U...
For the fabrication of rewritable electro-optic devices, we prepared randomly dispersed liquid crystal physical gels (LCPG) by constructing a well-defined hierarchical superstructure of a benzene-1,3,5-tricarboxamide (BTA)-based macrogelator (abbreviated BTA3AZO) in a host nematic (N) LC medium. The programmed BTA3AZO macrogelator in the NLC medium...
To understand the kinetically controlled polymorphic superstructures of asymmetric supramolecules, a pyrene-based asymmetric supramolecule (abbreviated as Py3M) was newly synthesized by connecting two pyrene head groups (Py) to a biphenyl-based dendritic tail (3M) with an isophthalamide connecter. Based on thermal, microscopic, spectroscopic and sc...
A multifunctional optical thin film (MOTF) is fabricated by coating the newly synthesized perylene-based reactive mesogen (PBRM) and stabilized by the subsequent photopolymerization. Based on the spectroscopic results combined with morphological observations, it is found that nematic liquid crystal (NLC) is aligned parallel to the molecular long ax...
For the development of advanced heat transfer organic materials (HTOMs) with excellent thermal conductivities, triphenylene-based reactive discogens, 2,3,6,7,10,11-hexakis(but-3-enyloxy) triphenylene (HABET) and 4,4',4'',4''',4'''',4'''''-(triphenylene-2,3,6,7,10,11-hexaylhexakis(oxy)) hexakis(butane-1-thiol) (THBT), were synthesized as discotic li...
A programmed light-responsive chiral liquid crystal is newly designed, precisely synthesized and efficiently applied as a remote-controllable molecular knob, by K.-U. Jeong and co-workers on page 4242. Photo-induced phase transformations in the mesomorphic helical superstructures enable the fabrication of optically tunable thin films which can be u...
The well-defined hierarchical superstructures constructed by the self-assembly of programmed supramolecules can be organized for the fabrication of remote-controllable actuating and rewritable films. To realize this concept, a benzene-1,3,5-tricarboxamide (BTA) derivative (abbreviated as BTA-3AZO) containing photo-responsive azobenzene (AZO) mesoge...
A programed light-responsive chiral liquid crystal (LC) containing four photochromic azobenzene moieties covalently connected to a central bicyclic chiral core (abbreviated as AZ4ICD) is newly designed, precisely synthesized, and efficiently applied as a remote-controllable molecular knob for the optically tunable thin film. First of all, phase evo...
We synthesised a triphenylene-based discotic reactive mesogen 2,3,6,7,10,11-hexakis(but-3-enyloxy)triphenylene (HABET) and investigated its performance as the compensation film for a vertical alignment-liquid crystal display (VA-LCD). The HABET molecule has a negative birefringence with an extraordinary refractive index (ne) that is smaller than th...
A photochromic chiral molecule with azobenzene mesogens and a (R)-configuration naphthyl moiety (abbreviated as NCA2M) was specifically designed and synthesized for the demonstration of chameleon-like color changes responding to multitudinous external stimuli, such as temperature, light and electric field. The basic phase transition behaviors of NC...
Photo-responsive carbohydrate-based giant surfactants (abbreviated as CELAnD-OH) were specifically designed and synthesized for the automatic vertical alignment (VA) layer of nematic (N) liquid crystal (LC), which can be applied for the fabrication of remote-controllable optical devices. Without the conventional polymer-based LC alignment process,...
To understand the relationships between chemical structures, molecular packing structures, and photophysical properties of organic materials, a butterfly shaped diphenylpyrimidine molecule (abbreviated as DPP-6C12) was newly synthesized [Park, M.; Choi, Y.-J.; Kim, D.-Y.; Hwang, S.-H.; Jeong, K.-U. Cryst. Growth Des. 2015, 15, 900-906]. By breaking...
A triphenylene-based reactive mesogenic molecule (abbreviated as HABET) was newly designed and synthesized as a programmed building block to construct the striped walls by the photopolymerization in the anisotropic liquid crystal (LC) solvents. On the basis of thermal, scattering and microscopic analyses, it was found that HABET formed three ordere...
The physical properties of two-dimensional disc-shaped aromatic carbon molecules strongly depend on the molecular packing structures. A butterfly-shaped diphenylpyrimidine molecule (DPP-6C12) was synthesized by covalently attaching two tridodecyl benzoate tails (6C12) at the both sides of the diphenylpyrimidine (DPP) moiety. Unique phase transition...
Spontaneous vertical alignment (VA) of a nematic liquid crystal medium, 4-cyano-4′-heptyloxybiphenyl (7OCB), was successfully achieved by directely adding a small amount of cyanobiphenyl monosubstituted polyhedral oligomeric silsesquioxane (POSS-CB) giant molecules [Kim, D.-Y.; Kim, S.; Lee, S.-A; Choi, Y.-E.; Yoon, W.-J.; Kuo, S.-W.; Hsu, C.-H.; H...
Without the conventional polymer-based liquid crystal (LC) alignment process, a newly synthesized dual photo-functionalized amphiphile (abbreviated as ADMA1) was successfully applied as a robust photo-reversible LC alignment layer by self-assembly and photo-polymerization. The LC alignment layer constructed by directly adding dual photo-functionali...
