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Triptycene-scaffolded tetraphenylethylenes with irregular temperature-dependence AIE
摘要： A series of new tetraphenylethylene monomer, dimer and three-dimensional trimer based triptycene-bridged triphenylethenes has been constructed. Their structures were clearly confirmed and the irregular fluorescent behaviors at different temperatures and solvents were investigated. Results showed the new tetraphenylethylenes performed remarkable aggregation-induced emission (AIE) properties and the emission intensities are dependent on temperature and viscosity. Compared with the model tetraphenylethylene without connecting triphenylethylene, the fluorescence quantum yields of the titled triptycene-scaffolded tetraphenylethylenes in aggregation are greater than tetraphenylethylene and increased as the increasing of the triphenylethylene units.
关键词： Tetraphenylethylene,Triptycene,Triphenylethene,AIE
更新于2025-09-23 15:22:29
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Triptycene Based Fluorescent Polymers with Pendant Alkyl Chains: Interaction with Fullerene and Morphology of Thin Films
摘要： We report unique triptycene based alternating copolymers bearing long alkyl chains as pendants. Syntheses utilized 2,6-diethynyltriptycene and appropriate alkyloxyarene monomers polymerized via Sonogashira cross coupling reaction to yield triptycene based poly(phenylene ethynylene)s (TPPEs). Resulting polymers are soluble in organic solvents and were characterized by FT-IR, NMR, GPC, TGA, AFM, SEM, UV-visible and fluorescence spectroscopic techniques. Experimental results suggest polymers are thermally stable and fluorescent. The fluorescence emission was quenched in presence of fullerenes (C60 and C70) suggesting their strong host-guest interactions. The magnitude of binding constant between polymer and these fullerenes was determined to be in the order of 105 M-1.The effect of chain length on the morphology and wettability of polymers on silicon substrates were studied using atomic force microscope. Three distinct dewetting patterns viz., spherical domains, fractal and ring structures, were observed with variation in the pendant chain length. This ability to control the thin film morphology of polymers may have potential technological applications, which includes but is not limited to sensors, fluorescent coatings and organic electronics.
关键词： Triptycene,binding interaction with fullerene,AFM,fluorescence
更新于2025-09-23 15:21:21
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Optically transparent, organosoluble poly(ether-amide)s bearing triptycene unit; synthesis and characterization
摘要： Aromatic polyamides are famous high performance polymeric materials for their excellent thermal, mechanical, electrical properties, which now a days became a dominant platform for modern polymer chemistry area. Triptycene unit like structures in polymer directly affects the physiochemical properties of polymer, thus polyamides especially with triptycene unit in their backbone with aryl ether linkage imparts combination of properties such as better solubility, melts processing characteristics, and better thermal stability in contrast with those of polymers without an aryl-ether linkageNew triptycene-containing bis(ether amine), 1,4-bis(4-aminophenoxy), 2, 3-benzotriptycene (4a) was synthesized from nucleophilic displacement reactions of P-fluoronitrobenzene with 1,4-dihydroxytriptycene, followed by reduction, and elucidated by FTIR, 1 H, 13 C NMR spectroscopy and HRMS. A series of new polyamides containing pendant triptycene group and flexibilizing ether linkages was synthesized by polycondensation of diamine with commercially available aromatic diacischlorides viz., terephthalylchloride (TPC), isophthalylchloride (IPC) and varying molar mixture of TPC and IPC accordingly. Synthesized Poly(ether-amide)s were found soluble in common organic solvents such as chloroform, dichloromethane, tetrahydrofuran, DMF, DMAc, DMSO also could be cast into excellent transperent thin films. Inherent viscosities of polyamides were in the range 0.44–0.57 dL/g. Polyamides exhibited initial decomposition temperature (Ti), glass transition temperatures (Tg) and temperature at 10% wt loss (t10), which was determined by TGA were noted in the range 212 (cid:1)C–305 (cid:1)C, 295 (cid:1)C –309 (cid:1)C and 587 (cid:1)C–631 (cid:1)C respectively with 24%–54% char yeild at 900 (cid:1)C under nitrogen atmosphere, indicating its better thermal stability and moderate glass transition temperature.
关键词： inherent viscosity,optical property,Polyamides,triptycene unit,thermal analysis,structure-property relationship
更新于2025-09-23 15:21:21
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Novel phosphorescent triptycene-based Ir( <scp>iii</scp> ) complexes for organic light-emitting diodes
摘要： A series of charge-neutral cyclometalated iridium(III) complexes (1–3 and 5–7) containing triptycene-substituted ligands (tbt and tpbi) and two parent complexes (4 and 8) were synthesized and characterized. The crystal structures indicated that π–π stacking interactions existed in ligand tbtH, but not in complex 6. However, a large intramolecular repulsion was found in complex 6. These triptycene-based complexes exhibited good thermal stability, which was higher compared with that of the parent complexes. These complexes showed green to yellow emission with peaks that ranged from 503 to 563 nm. The introduction of the rigid non-conjugate triptycene skeleton caused a slight emission red shift (<25 nm), but a significant increase in the PLQYs (>47%) was observed. The electroluminescent devices employing 2 and 6 as phosphors displayed impressive performance improvements and low efficiency roll-off because of the higher PLQYs and HOMO levels of these triptycene-based complexes. The maximum current and external quantum efficiencies of the devices based on complexes 2 and 6 were 41.7 cd A?1, 11.9% and 41.2 cd A?1, 12.6%, respectively, which were about 31% higher than that of the devices based on the parent complexes 4 and 8. This work provides a novel approach to develop highly efficient phosphors with a triptycene skeleton.
关键词： Ir(III) complexes,triptycene,thermal stability,phosphorescent,OLEDs,PLQYs
更新于2025-09-12 10:27:22