Tag: M.W=400-600

Huang, Wei; Bender, Markus; Seehafer, Kai; Wacker, Irene; Schroeder, Rasmus R.; Bunz, Uwe H. F. published the artcile< Novel Functional TPE Polymers: Aggregation-Induced Emission, pH Response, and Solvatochromic Behavior>, Product Details of C26H18Br2, the main research area is TPE polymer aggregation emission pH solvatochromic behavior; conjugated polymers; fluorescence; modification; selectivity.

Four tetraphenylethylene (TPE)-based aryleneethynylene polymers with amino or nitro groups are reported. They display strong aggregation-induced emission (AIE). The functional groups trigger acidochromic changes in the emission behavior of these polymers. Amino-substituted P1-P3 exhibit pH response through protonation of the amino groups. The position of the amino groups (on TPE or the side chains) influences the fluorescence intensity or emission wavelength as a response to different pH values. Nitro-P4 is solvatochromic due to its donor-acceptor structure. AIE, intramol. charge transfer, and Foerster resonance energy transfer define the fluorescence-based performance of the polymers. The amino-functionalized TPE polymers show excellent nitroarene-sensing performance. P4 is less effective than the amino polymers. A sensor array based on P1-P3 identifies 12 different nitroarenes in water.

Macromolecular Rapid Communications published new progress about Aggregation-induced emission. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Product Details of C26H18Br2.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Johnson, Kristen N.; Hurlock, Matthew J.; Zhang, Qiang; Hipps, K. W.; Mazur, Ursula published the artcile< Balancing Noncovalent Interactions in the Self-Assembly of Nonplanar Aromatic Carboxylic Acid MOF Linkers at the Solution/Solid Interface: HOPG vs. Au(111)>, COA of Formula: C26H18Br2, the main research area is tetraphenylethene tetracarboxylic acid self assembly MOF solution solid interface.

This study explores directed noncovalent bonding in the self-assembly of nonplanar aromatic carboxylic acids on Au and graphite surfaces. It is the 1st step in developing a new design strategy to create 2-dimensional surface metal-organic frameworks (SURFMOFs). The acid mols. used are tetraphenylethene-based and are typically employed in the synthesis of 3-dimensional (3D) MOF crystalline solids. They include tetraphenylethene tetracarboxylic acid, tetraphenylethene bisphenyl carboxylic acid, and tetraphenylethene tetrakis-Ph carboxylic acid. The 2-dimensional structures formed from these mols. on highly ordered pyrolytic graphite (HOPG) and Au(111) are studied by scanning tunneling microscopy in a solution environment. The process of monolayer formation and final surface linker structures are strongly dependent on the combination of the mol. and substrate used and are discussed in terms of intermol. and mol.-substrate interactions, bonding geometry, and symmetry of the acid mols. In the case of linker self-assembly on HOPG, the mol.-substrate interactions play a significant role in the resulting surface structure. When the acid mols. are adsorbed on Au(111), the intermol. interactions tend to dominate over the weaker mol.-substrate bonding. Addnl., the interplay of π-π interactions and hydrogen bonding that directs the surface self-assembly on different supports can be modified by varying the linker concentration This is particularly applicable for the case of the acid mols. adsorbing on the Au(111) substrate. Precise control over predesigned surface structures and orientation of the nonplanar aromatic carboxylic linkers open up an exciting prospect for manipulating the direction of SURFMOF growth in 2 dimensions and potentially in 3D.

Langmuir published new progress about Aromatic carboxylic acids Role: RCT (Reactant), RACT (Reactant or Reagent). 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, COA of Formula: C26H18Br2.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Wang, Ziyu; Wang, Ningning; Gao, Hang; Quan, Yiwu; Ju, Huangxian; Cheng, Yixiang published the artcile< Amplified electrochemiluminescence signals promoted by the AIE-active moiety of D-A type polymer dots for biosensing>, HPLC of Formula: 184239-35-8, the main research area is amplified electrochemiluminescence aggregation induced emission polymer dot biosensor.

Three-component conjugated polymers of a strong donor-acceptor (D-A) type could be synthesized by Pd-catalyzed Suzuki coupling polymerization reaction of 1,2-bis(4-bromophenyl)-1,2-diphenylethene (M-1) with 9-octyl-3,6-bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-9H-carbazole (M-2) and 4,6-bis((E)-4-bromostyryl)-2,2-difluoro-5-phenyl-2H-1|3,3,2|4-dioxaborinine (M-3). Among them, P-1 and P-2 with high TPE ratios at 0.95 and 0.9 showed obvious aggregation-induced emission (AIE) behavior; in contrast P-3 with a low TPE ratio at 0.8 showed an aggregation-caused quenching (ACQ) phenomenon. In particular, the three resulting polymer dots (P-1 to P-3 Pdots) exhibited a 200 mV lower electrochemiluminescence (ECL) potential due to their strong D-A electronic structure. Most importantly, the ECL signals of Pdots could be enhanced as high as 3 times by increasing their AIE-active TPE moiety ratios from 0.8 (P-3) to 0.95 (P-1) via the band gap emission process. Herein, P-1 Pdots with the strongest ECL signal were successfully used as ECL biosensors for the detection of catechol, epinephrine and dopamine with detection limits of 1, 7 and 3 nM, resp. This work provides a new strategy for developing highly sensitive ECL biosensors by the smart structure design of the AIE-active Pdots.

Analyst (Cambridge, United Kingdom) published new progress about Aggregation-induced emission. 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

Hong, Younggi; Goh, Munju published the artcile< Pressure Dependence on the Thermal Conductivity of H- and J-type Nanocomposites>, Recommanded Product: 1,2-Bis(4-bromophenyl)-1,2-diphenylethene, the main research area is biphenyl carbonitrile boron nitride epoxy nanocomposite thermal optical property.

The dependence of thermal conductivity on molding pressure in composites containing H- and J-type aggregation mols. is investigated for the first time. When mixed with hexagonal boron nitride (h-BN), small mols. capable of H- and J-aggregation significantly affect the orientation of h-BN under pressure, resulting in a substantial pressure dependence. For demonstration, 4′,4”’-(1,2-diphenylethylene-1,2-diyl)bis{(1,1′-biphenyl)-4-carbonitrile} (TPE-2CP) and 4′,4”’,4””’,4”””’-(ethene-1,1,2,2-tetrayl)tetrakis[{(1,1′-biphenyl)-4-carbonitrile}] (TPE-4CP) are synthesized, which exhibit H- and J-aggregation, resp. Furthermore, epoxy (EP) composites containing TPE-2CP or TPE-4CP are prepared, which show different aggregation states with changing pressure. As the pressure increases, the thermal conductivity gradually increases in the radial direction and decreases in the axial direction for TPE-4CP/EP (and vice versa for TPE-2CP/EP, but to a lesser extent). Consequently, the pressure dependence of composites with h-BN as a filler to TPE-4CP/EP is also examined The radial thermal conductivity of this h-BN/TPE-4CP/EP composite increases from 0.8888 W mK-1 at 10 MPa to 1.0062 W mK-1 at 50 MPa. The reasons for the appearance of aggregation states and changes in the thermal conductivity with increasing pressure are then discussed.

Advanced Materials Interfaces published new progress about Aggregation. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Recommanded Product: 1,2-Bis(4-bromophenyl)-1,2-diphenylethene.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Kalva, Nagendra; Tran, Chinh Hoang; Lee, Min Woong; Augustine, Rimesh; Lee, Soo Jeong; Kim, Il published the artcile< Aggregation-induced emission-active hyperbranched polymers conjugated with tetraphenylethylene for nitroaromatic explosive detection>, Reference of 184239-35-8, the main research area is fluorescence aggregate nitroarom explosive detection solid state sensor.

This work develops a facile synthesis for aggregation-induced emission (AIE)-active hyperbranched polyglycidols (HPGs) to design a solid-state sensor for detecting nitroarom. explosives. The tetraphenylethylene moieties were conjugated onto the periphery of the HPGs in a single step using dynamic boronate ester cross-linkers. The resulting AIE-active HPGs exhibited excellent AIE characteristics in THF (THF)/H2O mixtures, emitting a strong blue fluorescence under UV irradiation Dynamic light scattering and transmission electron microscopic analyses demonstrated that the self-assembled nanosized aggregates were stable in the THF/H2O mixture The fluorescence of the aggregates was dramatically quenched by various nitro compounds, including 2,4,6-trinitrophenol (or picric acid; PA), 2,6-dinitrophenol, 4-nitrophenol, 4-nitrotoluene, and nitromethane. The nano-aggregates exhibited extraordinary sensitivity towards PA, with a Stern-Volmer constant (Ksv) of 2.27 x 104 M-1 and a limit of detection of 40 ppb. Paper strips encapsulating the aggregates exhibited a vivid visual quenching, promising the practical applicability of these polymers as solid-state sensors for the detection of nitroarom. explosives.

Dyes and Pigments published new progress about Aggregates. 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

Liu, Shunjie; Ou, Hanlin; Li, Yuanyuan; Zhang, Haoke; Liu, Junkai; Lu, Xuefeng; Kwok, Ryan T. K.; Lam, Jacky W. Y.; Ding, Dan; Tang, Ben Zhong published the artcile< Planar and Twisted Molecular Structure Leads to the High Brightness of Semiconducting Polymer Nanoparticles for NIR-IIa Fluorescence Imaging>, Application In Synthesis of 184239-35-8, the main research area is mol structure brightness semiconducting polymer nanoparticle NIR fluorescence imaging.

Semiconducting polymer nanoparticles (SPNs) emitting in the second near-IR window (NIR-II, 1000-1700 nm) are promising materials for deep-tissue optical imaging in mammals, but the brightness is far from satisfactory. Herein, the authors developed a mol. design strategy to boost the brightness of NIR-II SPNs: structure planarization and twisting. By integration of the strong absorption coefficient inherited from planar π-conjugated units and high solid-state quantum yield (ΦPL) from twisted motifs into one polymer, a rise in brightness was obtained. The resulting pNIR-4 with both twisted and planar structure displayed improved ΦPL and absorption when compared to the planar polymer pNIR-1 and the twisted polymer pNIR-2. Given the emission tail extending into the NIR-IIa region (1300-1400 nm) of the pNIR-4 nanoparticles, NIR-IIa fluorescence imaging of blood vessels with enhanced clarity was observed Moreover, a pH-responsive poly(β-amino ester) made pNIR-4 specifically accumulate at tumor sites, allowing NIR-IIa fluorescence image-guided cancer precision resection. This study provides a mol. design strategy for developing highly bright fluorophores.

Journal of the American Chemical Society published new progress about Blood vessel. 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

Gao, Xin; Zhang, Qirui; Hu, Jianfeng; Zhang, Hao published the artcile< Ferrocene-containing cross-conjugated polymers synthesized by palladium-catalyzed cross-coupling polymerization>, Category: bromides-buliding-blocks, the main research area is ferrocene conjugated polymer palladium catalyzed coupling polymerization.

We have exploited an extremely efficient and versatile route to prepare ferrocene-containing cross-conjugated polymers (oligomers) in the main-chain. Using a variety of 1,1′-disubstituted ferrocenyl ketone-derived N-tosylhydrazones, reaction with aryl halides under palladium-catalysis gave 14 poly(ferrocenylene-vinylidene) cross-conjugated polymers (oligomers) in 50-80% yield. It was noteworthy that all the polymeric products were well soluble in common organic solvents, endowing them with high solution processability. Pendant double bonds of these cross-conjugated polymers (oligomers) were suitable towards further processing with high reactivity. The optical properties of the polymers (oligomers) were examined The electrochem. properties of polymers (oligomers) were investigated by cyclic voltammetry (CV) and suggested a quasi-reversible process. Moreover, these cross-conjugated polymers (oligomers) proved thermally stable and demonstrated promising potential as low-migration burning rate catalysts.

Polymer published new progress about Electric current-potential relationship. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Category: bromides-buliding-blocks.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Liu, Xiaolin; Liang, Xin; Hu, Yubing; Han, Lei; Qu, Qing; Liu, Dongming; Guo, Jing; Zeng, Zebing; Bai, Haotian; Kwok, Ryan T. K.; Qin, Anjun; Lam, Jacky W. Y.; Tang, Ben Zhong published the artcile< Catalyst-Free Spontaneous Polymerization with 100% Atom Economy: Facile Synthesis of Photoresponsive Polysulfonates with Multifunctionalities>, Recommanded Product: 1,2-Bis(4-bromophenyl)-1,2-diphenylethene, the main research area is multifunctional polysulfonate catalyst free spontaneous polymerization.

Photoresponsive polymers have attracted extensive attention due to their tunable functionalities and advanced applications; thus, it is significant to develop facile in situ synthesis strategies, extend polymers family, and establish various applications for photoresponsive polymers. Herein, we develop a catalyst-free spontaneous polymerization of dihaloalkynes and disulfonic acids without photosensitive monomers for the in situ synthesis of photoresponsive polysulfonates at room temperature in air with 100% atom economy in high yields. The resulting polysulfonates could undergo visible photodegradation with strong photoacid generation, leading to various applications including dual-emissive or 3D photopatterning, and practical broad-spectrum antibacterial activity. The halogen-rich polysulfonates also exhibit a high and photoswitched refractive index and could undergo efficient postfunctionalizations to further expand the variety and functionality of photoresponsive heteroatom-containing polyesters.

JACS Au published new progress about Abbe number. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Recommanded Product: 1,2-Bis(4-bromophenyl)-1,2-diphenylethene.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Xie, Linhuang; Zheng, Zhiye; Lin, Qiuyuan; Zhou, Huan; Ji, Xiaofan; Sessler, Jonathan L.; Wang, Hongyu published the artcile< Calix[4]pyrrole-based Crosslinked Polymer Networks for Highly Effective Iodine Adsorption from Water>, Computed Properties of 184239-35-8, the main research area is calixpyrrole crosslinked polymer iodine adsorption water; adsorption; calix[4]pyrrole; iodine; porous organic polymers.

A series of calix[4]pyrrole-based crosslinked polymer networks designed for iodine capture is reported. These materials were prepared by Sonogashira coupling of α,α,α,α-tetra(4-alkynylphenyl)calix[4]pyrrole with bishalide building blocks with different electronic properties and mol. sizes. Despite their low Brunauer-Emmett-Teller surface areas, iodine vapor adsorption capacities of up to 3.38 g g-1 were seen, a finding ascribed to the presence of a large number of effective sorption sites including macrocyclic π-rich cavities, aryl units, and alkyne groups within the material. One particular system, C[4]P-BTP, was highly effective at iodine capture from water (uptake capacity of 3.24 g g-1 from a concentrated aqueous KI/I2 solution at ambient temperature). Fast capture kinetics (kobs=7.814 g g-1 min-1) were seen. Flow-through adsorption experiments revealed that C[4]P-BTP is able to remove 93.2% of iodine from an aqueous source phase at a flow rate of 1 mL min-1.

Angewandte Chemie, International Edition published new progress about Adsorbents. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, Computed Properties of 184239-35-8.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Huang, Bin; Cheng, Yujun; Lei, Hui; Hu, Lin; Li, Zaifang; Huang, Xuexiang; Chen, Lie; Chen, Yiwang published the artcile< A novel AIE molecule as a hole transport layer enables efficient and stable perovskite solar cells>, SDS of cas: 184239-35-8, the main research area is perovskite solar cell hole transport layer aggregation induced emission.

A low-cost and efficient hole transport layer (HTL) material (TPE-CZ) with the aggregation-induced emission (AIE) effect has been synthesized. Due to the AIE effect, perovskite solar cells with TPE-CZ as the HTL deliver a higher power conversion efficiency (PCE) of 18% with better stability than those with the reference HTL (Spiro-OMeTAD).

Chemical Communications (Cambridge, United Kingdom) published new progress about Aggregation-induced emission. 184239-35-8 belongs to class bromides-buliding-blocks, and the molecular formula is C26H18Br2, SDS of cas: 184239-35-8.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary