Polymer, Journal Year: 2024, Volume and Issue: 317, P. 127954 - 127954
Published: Dec. 12, 2024
Language: Английский
Molecular Crystals and Liquid Crystals, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 15
Published: March 10, 2025
Language: Английский
Citations
0
Liquid Crystals, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 14
Published: July 24, 2024
Addressing the current challenge of high melting points and long π-conjugated skeletons in luminescent nematic liquid crystals (LCs), this study explores incorporation push-pull dyes with biphenyl tolane to extend fluorescence emission wavelengths into visible light region. We synthesised push-pull-type derivatives incorporating alkylamino groups as donors cyano acceptors. The thermal behaviour was investigated using optical polarisation microscopy, differential scanning calorimetry X-ray diffraction. Notably, some molecules exhibited a phase. photophysical properties solution solid states were also investigated. Furthermore, we formulated room-temperature LC by blending several LCs. Importantly, phase red-shift compared that observed states. This demonstrates efficacy structure design findings hold considerable implications for development advanced optoelectronic devices, particularly those requiring materials tailored properties.
Language: Английский
Citations
2
Aggregate, Journal Year: 2024, Volume and Issue: unknown
Published: Sept. 4, 2024
Abstract Nematic liquid crystals (NLCs), that is, fluids with optical anisotropy as well electric‐ and magnetic‐field responsiveness, have been widely used in commercial crystal displays. Recent advancements extended the scope of NLC molecules to large calamitic π‐conjugated systems, which heralds prospects for novel applications exploit their superior electronic or functionalities in, example, electric field controlled fluorescence switch devices. However, phases such π‐systems usually flow only at high temperatures, hampers device operate around room temperature. Here, we show near‐room‐temperature NLCs a fluorophore by introducing flexible cyclic structure into mesogenic core. 3,8‐Bis(4‐propylphenyl)‐6,7‐dihydro‐5 H ‐benzo[7]annulene ( DPB[7]‐C3 ) has nematic phase significantly lower temperature range (52.6–160.4°C) than analog without alkylene bridges, E )‐4‐propyl‐4′‐(4‐propylstyryl)‐1,1′‐biphenyl (248–262°C). We attribute this decrease transition intramolecular conformational entropies arise from geometric change structure, involves rotational motion single biaryl‐bonds bending motions along long molecular axis thermal equilibrium state. The practical utility these is demonstrated preparing an electric‐field‐responsive large‐area fluorescent sub‐millisecond response time mixture 3,8‐bis(4‐alkylphenyl)‐6,7‐dihydro‐5 ‐benzo[7]annulenes DPB[7]‐C n s ).
Language: Английский
Citations
2
Organic & Biomolecular Chemistry, Journal Year: 2024, Volume and Issue: unknown
Published: Jan. 1, 2024
Macrocyclic aromatic amides 2, in which the
Language: Английский
Citations
1
Chemical Communications, Journal Year: 2024, Volume and Issue: unknown
Published: Jan. 1, 2024
A chiral supramolecular liquid crystal based on a pillararene mesogen was constructed. The regulation of behavior achieved through the host-guest interactions between pillararene-based and tetraphenylethylene-containing guest. In addition, this system, showing pH-responsive fluorescence emission character, applied as an information encryption material capable storing multiple levels distinct information, thereby enriching application materials in field security.
Language: Английский
Citations
0
Molecules, Journal Year: 2024, Volume and Issue: 29(21), P. 5220 - 5220
Published: Nov. 4, 2024
In recent years, π-conjugated liquid crystalline molecules with optoelectronic functionalities have garnered considerable attention, and integrating these into side-chain polymers (SCLCPs) holds potential for developing devices that are operational near room temperature. However, it is difficult to design SCLCPs excellent processability because mesogens rigid rods, low solubility in organic solvents, a high isotropization Recently, we developed near-room-temperature nematic crystals based on “bridged stilbene”. this work, synthesized polyacrylate SCLCP incorporating bridged stilbene exhibited phase temperature could maintain crystallinity more than three months. We conducted thorough structure analysis evaluated the optical properties. The birefringence values of resulting were higher those corresponding monomers enhanced order parameters due polymer effect. addition, inherited mesogen-derived AIE properties, quantum yields (Φfl = 0.14–0.35) solid state. It noteworthy maximum fluorescence wavelength redshift greater 27 nm as consequence film formation. Thus, several unique characteristics unattainable small molecular systems.
Language: Английский
Citations
0
Bulletin of the Chemical Society of Japan, Journal Year: 2024, Volume and Issue: 97(11)
Published: Oct. 30, 2024
Abstract Optical waveguides based on elastic molecular crystals are of interest as flexible and compact optical communication materials. Low emission efficiency is often a problem in terms signal strength, an increase the loss factor α due to fluorescence reabsorption crystal reduces photon transport efficiency. Here, we report development improvement Förster resonance energy transfer (FRET)-assisted using anthracene-based mixed crystals. 9,10-Dicyanoanthracene was selected dopant for solution-grown crystallization 9,10-dibromoanthracene. 1H NMR measurements obtained showed that acceptor doping be 1% 5%. Elastic behavior observed even when doped with few percent acceptor. The quantum 0.016, dramatic over previous luminescent (0.004). value (92 dB/cm) this containing 1%-doped 9,10-dicyanoanthracene much lower than consisting only 9,10-dibromoanthracene (1258 reduced FRET system. We have demonstrated practical approach toward developing improved fluorescent, highly efficient, by constructing structure selecting appropriate molecules their low ratios.
Language: Английский
Citations
0
Crystal Research and Technology, Journal Year: 2024, Volume and Issue: unknown
Published: Dec. 6, 2024
Abstract Naphtho[1,2‐c:5,6‐c]bis[1,2,5]chalcogendiazole is an important building block for organic devices due to its highly electron‐accepting properties. However, despite being effective unit of low band gap semiconductors, fewer studies have been conducted on analyzing such units understand their crystal structure. Here the structure analysis naphtho[1,2‐c:5,6‐c]bis[1,2,5]thiadiazole, naphtho[1,2‐c:5,6‐c]bis[1,2,5]oxadiazole reported, and these brominated motifs. Crystal structures naphtho[1,2‐c:5,6‐c]bis[1,2,5]thiadiazoles compound show that molecules form coplanar through N···S contacts, resulting in parallel face‐to‐face packing π‐π stacking. Double contacts are found as a priority compounds. On other hand, naphtho[1,2‐c:5,6‐c]bis[1,2,5]oxadiazoles gave N···H─C networks with These differences will probably induce difference naphtho[1,2‐c:5,6‐c]bis[1,2,5]chalcogendiazole‐based extended π‐systems. Brominated one exhibits polymorphs, which works N···Br or Br···Br based interaction σ‐hole bromide. investigations can be applied order‐made synthesis self‐assembled soft matter functional molecular crystals.
Language: Английский
Citations
0
Polymer, Journal Year: 2024, Volume and Issue: 317, P. 127954 - 127954
Published: Dec. 12, 2024
Language: Английский
Citations
0