Category: 184239-35-8

Li, Baixue; Hu, Rong; Qin, Anjun; Tang, Ben Zhong published the artcile< Copper-based ionic liquid-catalyzed click polymerization of diazides and diynes toward functional polytriazoles for sensing applications>, Safety of 1,2-Bis(4-bromophenyl)-1,2-diphenylethene, the main research area is copper ionic liquid catalyst stereoregular polytriazole preparation chemosensor.

Click polymerizations of azides and alkynes catalyzed by Cu(I) species have been widely studied and play a significant role in polymer synthesis. In these approaches, long reaction time and/or elevated temperature are generally required. Fabrication of new catalytic systems with higher efficiency and an energy saving feature is still a key challenge. In this work, an efficient copper-based ionic liquid (Cu-IL) is facilely prepared and used to catalyze the azide-alkyne click polymerization under mild reaction conditions. Soluble and thermally stable 1,4-regioregular polytriazoles (PTAs) with satisfactory mol. weights (up to 56 100) are readily synthesized in high yields (up to 95%). Thanks to its intense blue fluorescence and excellent water-solubility, the resultant ionic PTA could be applied for sensitive explosive detection, selective Fe3+ ion recognition and specific bioimaging in its aqueous solution Thus, this work not only establishes a powerful Cu-IL-catalyzed azide-alkyne click polymerization but also provides PTAs with versatile properties.

Polymer Chemistry published new progress about Alkadiynes Role: RCT (Reactant), RACT (Reactant or Reagent) (terminal). 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Safety of 1,2-Bis(4-bromophenyl)-1,2-diphenylethene.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Sun, Ningwei; Su, Kaixin; Zhou, Ziwei; Wang, Daming; Fery, Andreas; Lissel, Franziska; Zhao, Xiaogang; Chen, Chunhai published the artcile< ""Colorless-to-Black"" electrochromic and AIE-active polyamides: an effective strategy for the highest-contrast electrofluorochromism>, Application In Synthesis of 184239-35-8, the main research area is Colorless Black electrochromic AIE active polyamides effective strategy.

Electrofluorochromic (EFC) materials have gained extensive attention owing to their interesting modulations of fluorescence by an elec. stimulus. However, the limited performances, especially the low fluorescence on/off contrast, significantly hampered their further applications. Herein, we design a new strategy to achieve high-contrast electrofluorochromism by combinations of “”colorless-to-black”” electrochromism and highly fluorescent AIE activity. Given the effective fluorescence quenching effect and high solid-state fluorescence, a fluorescence contrast of 838 is realized, to the best of our knowledge, the highest reported so far. Furthermore, to explore the structure-property relationships, we also separated the E/Z isomers of tetraphenylethylene (TPE) and studied the properties of the three electroactive/fluorescent polymers (11TPE-PA, E-12TPE-PA, and Z-12TPE-PA) derived from different TPE derivatives and isomers. The three branches of polymers all exhibited AIE-active and “”colorless-to-black”” electrochromic (EC) properties. In addition to the ultrahigh fluorescence contrast, Z-12TPE-PA also integrated high electrochromic contrast (Δ% T = 92%), short response time (0.6 s/0.3 s), and excellent switching stability (300 cycles), paving the way for the applications in various electronic applications. The study will provide novel insights into the future design and development of high-performance EC/EFC materials.

Macromolecules (Washington, DC, United States) published new progress about Electrochromic materials. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Application In Synthesis of 184239-35-8.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Qin, Mengmeng; Xu, Yuxiao; Gao, H.; Han, Guoying; Cao, Rong; Guo, Peili; Feng, Wei; Chen, Li published the artcile< Tetraphenylethylene@graphene oxide with switchable fluorescence triggered by mixed solvents for the application of repeated information encryption and decryption>, Product Details of C26H18Br2, the main research area is aggregation induced emission optical information storage; composite; graphene oxide; solvent treatment; switchable microstructure and fluorescence; tetraphenylethylene.

Aggregation-induced emission (AIE) materials present unique solid-state fluorescence. However, there remains a challenge in the switching of fluorescence quenching/emitting of AIE materials, limiting the application in information encryption. Herein, we report a composite of tetraphenylethylene@graphene oxide (TPE@GO) with switchable microstructure and fluorescence. We choose GO as a fluorescence quencher to control the fluorescence of TPE by controlling the aggregation structure. First, TPE coating with an average thickness of about 31 nm was deposited at the GO layer surface, which is the critical thickness at which the fluorescence can be largely quenched because of the fluorescence resonance energy transfer. After spraying a mixed solvent (good and poor solvents of TPE) on TPE@GO, a blue fluorescence of TPE was emitted during the drying process. During the treatment of mixed solvents, the planar TPE coating was dissolved in THF first and then the TPE mols. aggregated into nanoparticles (an average diameter of 65 nm) in H2O during the volatilization of THF. We found that the fluorescence switching of the composite is closely related to the microstructural change of TPE between planar and granular structures, which can make the upper TPE mols. in and out of the effective quenching region of GO. This composite, along with the treatment method, was used as an invisible ink in repeated information encryption and decryption. Our work not only provides a simple strategy to switch the fluorescence of solid-state fluorescent materials but also demonstrates the potential for obtaining diverse material structures through compound solvent treatment.

ACS Applied Materials & Interfaces published new progress about Aggregation. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Product Details of C26H18Br2.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Guo, Zhewen; Zhao, Jun; Liu, Yuhang; Li, Guangfeng; Wang, Heng; Hou, Yali; Zhang, Mingming; Li, Xiaopeng; Yan, Xuzhou published the artcile< Conformational effect on fluorescence emission of tetraphenylethylene-based metallacycles>, Reference of 184239-35-8, the main research area is phenylene bridged pyridyl platinum metallacycle preparation crystal mol structure; conformation fluorescence emission tetraphenylethylene phenylene bridged pyridyl platinum metallacycle.

Herein, the authors designed and constructed two metallacycles, 1 and 2, to illustrate the conformational effect of isomeric AIE fluorophores on the platform of supramol. coordination complexes (SCCs). Specifically, the dangling Ph rings in TPE units of the metallacycle 1 align completely outside the main cyclic structure, while in the metallacycle 2, these Ph rings align half inside and half outside. The exptl. results showed that two metallacycles exhibited different behaviors in terms of AIE fluorescence and chem. sensing, which could be attributed to the subtle structural difference of the TPE units. This work represents the unification of topics such as self-assembly, AIE, and chem. sensing, and further promotes the understanding for the structure-property relationship of isomeric AIE fluorophores.

Chinese Chemical Letters published new progress about Crystal structure. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Reference of 184239-35-8.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Song, Bo; Bai, Tianwen; Xu, Xiaotian; Chen, Xu; Liu, Dongming; Guo, Jiali; Qin, Anjun; Ling, Jun; Tang, Ben Zhong published the artcile< Multifunctional Linear and Hyperbranched Five-Membered Cyclic Carbonate-Based Polymers Directly Generated from CO2 and Alkyne-Based Three-Component Polymerization>, Application of C26H18Br2, the main research area is multifunctional linear hyperbranched cyclic carbonate polymer; carbon dioxide alkyne aryl halide polymerization.

Fixing carbon dioxide (CO2) into polymeric materials is a subject of enduring interest but limited to few efficient polymerizations In this work, a facile Pd(OAc)2/LiOtBu-catalyzed one-pot, three-component polymerization of CO2, bis(propargylic alc.)s, and aryl dihalides under atm. pressure is developed. Linear and hyperbranched multifunctional five-membered cyclic carbonate (5CC)-based polymers with well-defined structures, high weight-average mol. weights (Mw up to 42500), and versatile properties such as aggregation-induced emission and chiral and porous properties are successfully produced in excellent yields (up to 96%). The reaction mechanism was well studied via the d. functional theory calculation and in situ Fourier transform IR spectroscopy, both indicating that there is synergistic reaction effect among CO2, bis(propargylic alc.)s, and aryl dihalides. The polymers could be postfunctionalized by amines via catalyst-free regioselective ring-opening reaction with 100% grafting ratio. Thus, this work not only develops a new way to directly fix CO2 into polymeric materials but also provides the 5CC-based polymers with versatile properties, showing great potentials in diverse areas.

Macromolecules (Washington, DC, United States) published new progress about Aggregation-induced emission. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Application of C26H18Br2.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Barros, Helio Lopes; Esteves, Maria Alexandra; Brites, Maria Joao published the artcile< Synthesis and photophysical properties of tetraphenylethylene derivatives as luminescent downshifting materials for organic photovoltaic applications>, HPLC of Formula: 184239-35-8, the main research area is tetraphenylethylene luminescent organic solar cell.

Luminescent Down-Shifting (LDS) is an optical approach applied in several photovoltaic (PV) technologies in which high energy solar radiation is converted to a wavelength region where the response of the photovoltaic devices is better. The use of LDS layers on organic photovoltaics (OPV) could serve two purposes: to prevent cell degradation by filtering the incident UV radiation and to improve the spectral response of PV cells at short-wavelength. This work reports, the design and synthesis of a series of tetraphenylethylene (TPE) derivatives based on TPE-A or A-π-TPE-π-A mol. structure featuring various electron-acceptor (A) groups. The photophys. properties of the new LDS compounds were systematically studied in 1,4-dioxane solution and film (Zeonex) by UV-visible absorption and fluorescence spectroscopy, and electrochem. properties studied by cyclic voltammetry. Thermal stability of the new LDS compounds was evaluated by Thermogravimetric anal. (TGA). Theor. computational studies provided evidence of existence of intramol. charge-transfer (ICT) between frontier orbitals of donor and acceptor moieties. The good photophys. and thermal properties of the synthesized TPE derivatives, associated with high molar absorption coefficients in UV spectrum and emission maximum in the range of 476-531 nm, make them promising candidates for LDS layers in OPV application.

Dyes and Pigments published new progress about Electric current-potential relationship. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, HPLC of Formula: 184239-35-8.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Yu, Tiechen; Han, Yuntao; Yao, Hongyan; Chen, Zheng; Guan, Shaowei published the artcile< Polymeric optoelectronic materials with low-voltage colorless-to-black electrochromic and AIE-activity electrofluorochromic dual-switching properties>, HPLC of Formula: 184239-35-8, the main research area is polyamide optoelectronic material electrofluorochromic dual switching property.

In recent years, colorless-to-black electrochromic (EC) and electrofluorochromic (EFC) materials are attracting increasing interest for the fundamental scientific research and potential applications. In order to achieve multiple-response optoelectronic materials with better black conversion and solid-state fluorescence performance (black-color/emission dual-switchable materials), the authors adopted a novel design strategy to synthesis a diamine monomer named TPE-NH2, in which the π-core tetraphenylethene (TPE) connects with two oxidation centers. All the polyamides/polyimides based on this monomer exhibited good solubility, thermal stability and aggregation-induced emission (AIE) activity. Among these, polyamide 5a not only showed rare EC properties (colorless-to-black) with ultra-low voltage (0-0.75 V), high optical contrasts (up to 87.9% at 692 nm) and fast switching times (2.04/1.45 s) but also demonstrated high fluorescence properties with the introduction of TPE. In addition, polyamide 5a showed good continuous switching stability for EC property and acceptable stability for EFC property, which makes it a potential candidate in EC/EFC applications.

Dyes and Pigments published new progress about Band gap. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, HPLC of Formula: 184239-35-8.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Zhu, Huajie; An, Jinxia; Pang, Chengcai; Chen, Shuai; Li, Wei; Liu, Jinbiao; Chen, Qixian; Gao, Hui published the artcile< A multifunctional polymeric gene delivery system for circumventing biological barriers>, Quality Control of 184239-35-8, the main research area is multifunctional polymer gene delivery.

Aiming to circumvent the pre-defined obstacles in the journey of gene transportation, we attempt to compile a number of functional components into a tandem tri-copolymeric material. Herein, a β-cyclodextrin-functionalized poly(glycerol methacrylate) (PG) segment and a quaternary amine-functionalized poly[(2-acryloyl)-ethyl-(p-boronic acid pinacol ester benzyl)diethylammonium bromide] (BP) segment are attached to complex DNA to formulate a nanoscaled delivery system based on electrostatic interactions. The formulated polyplex is strengthened by a hydrophobic poly[2-(5,5-dimethyl-1,3-dioxan-2-yloxy)ethyl acrylate] (PDM) segment, affording improved complex stability. To retrieve the polyplex from entrapment by acidic and digestive endo/lysosomes, light-stimulated ROS-producing 4,4′-(1,2-diphenylethene-1,2-diyl)bis(1,4-phenylene)diboronic acid (TPE) is installed in the cavities of cyclodextrin. Upon light irradiation, TPE is triggered to produce abundant ROS, not only committing disruption of the endo/lysosome membrane for polyplex escape from the entrapment but also inducing the transformation of the pos. charged BP to become neg. charged. This charge conversion behavior, together with the transformation of PDM to be hydrophilic and responsive to an acidic endosome pH gradient (pH 5.0) is envisioned to induce the dissociation of the electrostatically-assembled polyplex, thereby facilitating the release of the DNA payload for the subsequent transcription machinery. This strategically-tailored and easily synthesized tandem tri-copolymer exhibits excellent gene expression activity and provides a facile response to endogenous and exogenous stimuli for active gene expression.

Journal of Materials Chemistry B: Materials for Biology and Medicine published new progress about Gene therapy. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Quality Control of 184239-35-8.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Zhao, Peng; Wang, Lijie; Wu, Yusen; Yang, Tao; Ding, Yun; Yang, Hua Gui; Hu, Aiguo published the artcile< Hyperbranched Conjugated Polymer Dots: The Enhanced Photocatalytic Activity for Visible Light-Driven Hydrogen Production>, Electric Literature of 184239-35-8, the main research area is hyperbranched conjugated polymer dot photocatalysis hydrogen evolution reaction.

Conjugated polymer (CP) aggregates with linear/cross-linked structures are widely reported as photocatalysts for hydrogen evolution reaction. For full disclosure of the relation between the photocatalytic performance and structural features of the CP photocatalysts, homogeneous dispersion of these CPs in aqueous medium is necessary, which however is difficult to be achieved. Herein, we report several coassembled polymeric dots (Pdots) consisting of PEG45-b-PMMA103 and CPs with various structural features. We found that the Pdots of hyperbranched soluble CP nanoparticles (SCPNs) exhibit a high H2 evolution rate up to 840 μmol h-1 g-1 with no platinum or rhodium as a cocatalyst, superior to their analogs with the linear or cross-linked structure. A possible charge-transfer mechanism suggests that the photoelectrons directly mobilize to the surface of these single-particulate Pdots over three-dimensional skeleton and successfully avoid the ineffective intermol. charge transfer, leading to the shortened diffusion path of photoelectrons and enhanced photolysis efficacy. We believe that the high dispersion stability (2 mo), solution processability, and structural tunability of these Pdots with hyperbranched SCPNs would inspire further research on designing multicomponent photocatalysts for highly efficient visible light-driven hydrogen evolution reaction.

Macromolecules (Washington, DC, United States) published new progress about Fluorescence decay. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Electric Literature of 184239-35-8.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Tu, Yu-Wei; Wang, Chao-Chi; Godana, Alis Shano; Yu, Chin-Yang published the artcile< Synthesis, characterization, aggregation-induced emission and nanoaggregates of the copolymers containing different ratios of carbazoles and tetraphenylethylenes>, Formula: C26H18Br2, the main research area is carbazoles tetraphenylethylene conjugated polymer aggregate emission.

In this work, polymers comprising of the different ratios of N-decyl or N-triethylene glycol substituted 2,7-carbazoles and tetraphenylethenes were designed and synthesized by palladium-catalyzed Suzuki Miyaura cross-coupling reaction of their corresponding comonomers. The copolymers containing carbazoles and tetraphenylethenes showed aggregation induced emission characteristics in both solid state and aggregate state when the composition of the tetraphenylethenes reached to 50%. N-triethylene glycol substituted carbazole polymers revealed lower bandgap and higher HOMO level compared to that of the N-decyl substituted carbazole polymers. The higher composition of the tetraphenylethenes, the deeper HOMO level and the larger bandgap of the polymers. Polymers with 1:1 molar ratio of the carbazoles and the tetraphenylethenes exhibited sphere-like nanoparticles with an average diameter of around 30 nm. The polymers containing carbazole and TPE units in 3:1 or 1:3 molar ratio self-assembled to form nanoaggregates with a size of around 100 nm.

European Polymer Journal published new progress about Aggregation-induced emission. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Formula: C26H18Br2.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary