Category: 576-83-0

Chen, Xu-Lin; Tao, Xiao-Dong; Wei, Zhuangzhuang; Meng, Lingyi; Lin, Fu-Lin; Zhang, Dong-Hai; Jing, Yan-Yun; Lu, Can-Zhong published the artcile< Thermally Activated Delayed Fluorescence Amorphous Molecular Materials for High-Performance Organic Light-Emitting Diodes>, HPLC of Formula: 576-83-0, the main research area is thermally activated delayed fluorescence amorphous mol material high performance; OLEDs; amorphous molecular materials; bimesitylene; film quality; stability; thermally activated delayed fluorescence.

Small-mol. thermally activated delayed fluorescence (TADF) materials have been extensively developed to actualize efficient organic LEDs (OLEDs). However, organic small mols. generally compromise thin film quality and stability due to the tendency of crystallization, aggregation, and phase separation, which hence degrade the efficiency and long-term stability of the OLEDs. Here, for the first time, we exploit the unique mol. configuration of the bimesitylene scaffold to design two highly efficient TADF amorphous mol. materials with excellent thermal and morphol. stabilities. The twisted and rigid bimesitylene scaffold thwarts regular mol. packing and crystallization, thereby guaranteeing homogeneous and stable amorphous thin films. Meanwhile, the highly twisted geometry of the bimesitylene scaffold efficiently breaks the mol. conjugation and thus conserves the high energies of the lowest locally excited triplet states (3LE) above the lowest charge transfer states (1CT and 3CT), leading to small singlet-triplet energy splitting and fast reverse intersystem crossing. These TADF emitters exhibit high photoluminescence quantum yields of 0.90 and 0.69 and short TADF lifetimes of 4.94 and 1.44μs in doped films, based on which the greenish-blue and greenish-yellow OLEDs achieve external quantum efficiencies of 23.2 and 16.2%, resp., with small efficiency roll-off rates and perfect color stability.

ACS Applied Materials & Interfaces published new progress about Crystallinity. 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, HPLC of Formula: 576-83-0.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Yeung, Jason; Becker, Matthias; Stephan, Douglas W. published the artcile< Towards macrocyclic frustrated Lewis pairs>, Safety of 2,4,6-Trimethylbromobenzene, the main research area is crystal structure mol boron macrocycle frustrated Lewis pair preparation; macrocyclic frustrated Lewis pair boron nitrogen bond macrocycle preparation.

Macrocycles with and without B-N bonds were prepared from reaction of C6F5BH2·SMe2 or MesBH2 with the 2,6-pyridinedimethanol derivatives Both classes of macrocycle reacted with B(C6F5)3 but were unreactive to small mols. These observations provide insights for the subsequent design of macrocyclic FLPs for multi-electron reactions.

Dalton Transactions published new progress about B-N bond. 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, Safety of 2,4,6-Trimethylbromobenzene.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Muraoka, Takako; Ishii, Yasuhisa; Siti, Nursaliha; Nasu, Masahiro; Wahida, Nurul Ain; Ueno, Keiji published the artcile< Syntheses and Structures of Gallyliron Complexes with Pyridine Ligands and Their Reactions with Methyl Acrylate>, Recommanded Product: 2,4,6-Trimethylbromobenzene, the main research area is photolysis dichloro gallyl iron complex pyridine; crystal structure mol gallium iron pyridine complex preparation; gallyl iron pyridine complex preparation coordinative substitution methyl acrylate.

Reactions of gallyliron complexes Cp*(OC)2FeGaR2 (R = Cl (1), Mes (2); Cp*, η5-C5Me5; Mes, 2,4,6-Me3C6H2) with pyridine in C6D6 afforded pyridine-stabilized gallyl complexes Cp*(OC)2Fe{GaR2(py)} (R = Cl (3), Mes (5a); py, pyridine). Photoirradiation of dichlorogallyl complex 3 in the presence of excess pyridine in benzene proceeded via the substitution of a CO ligand with another pyridine to give Cp*(OC)(py)Fe{GaCl2(py)} (4). However, photoirradiation of dimesitylgallyl complex 2 in the presence of excess pyridine gave gallane(pyridyl)iron complex Cp*(OC)Fe{(η1-HGaMes2)(η1-2-C5H4N)} (6a) via CO elimination and oxidative addition of the C-H bond at the 2-position of the gallium-coordinated pyridine. X-ray crystal structure anal. of 6a revealed the formation of a 3-center-2-electron (3c2e) bond in the Fe-H-GaMes2 fragment. Reaction of 4 with Me acrylate in toluene at 50°C resulted in substitution of the pyridine ligand on the iron atom with the C:C bond, giving Cp*(OC)(η2-CH2:CHCO2Me)Fe{GaCl2(py)} (7). In contrast, the reaction of 6a with Me acrylate in toluene at 100°C afforded vinyl iron complex Cp*(OC)2Fe(CH:CH2) (8) and 4-membered Ga2O2 cyclic gallane compound [Mes2GaOMe]2 (9) via cleavage of the Fe-Ga, C-O, and C-C bonds.

Organometallics published new progress about Bond cleavage. 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, Recommanded Product: 2,4,6-Trimethylbromobenzene.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Shao, Wenhao; Jiang, Hanjie; Ansari, Ramin; Zimmerman, Paul M.; Kim, Jinsang published the artcile< Heavy atom oriented orbital angular momentum manipulation in metal-free organic phosphors>, Quality Control of 576-83-0, the main research area is metal free organic phosphor orbital angular momentum.

Metal-free purely organic phosphors (POPs) are emerging materials for display technologies, solid-state lighting, and chem. sensors. However, due to limitations in contemporary design strategies, the intrinsic spin-orbit coupling (SOC) efficiency of POPs remains low and their emission lifetime is pinned in the millisecond regime. Here, we present a design concept for POPs where the two main factors that control SOC-the heavy atom effect and orbital angular momentum-are tightly coupled to maximize SOC. This strategy is bolstered by novel natural-transition-orbital-based computational methods to visualize and quantify angular momentum descriptors for mol. design. To demonstrate the effectiveness of this strategy, prototype POPs were created having efficient room-temperature phosphorescence with lifetimes pushed below the millisecond regime, which were enabled by boosted SOC efficiencies beyond 102 cm-1 and achieved record-high efficiencies in POPs. Electronic structure anal. shows how discrete tuning of heavy atom effects and orbital angular momentum is possible within the proposed design strategy, leading to a strong degree of control over the resulting POP properties.

Chemical Science published new progress about Angular momentum, orbital. 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, Quality Control of 576-83-0.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Fricke, Christoph; Deckers, Kristina; Schoenebeck, Franziska published the artcile< Orthogonal Stability and Reactivity of Aryl Germanes Enables Rapid and Selective (Multi)Halogenations>, SDS of cas: 576-83-0, the main research area is fluorination iodination bromination aryl germane; chemoselectivity; germanium; halogenation; reaction mechanisms; synthetic methods.

While halogenation is of key importance in synthesis and radio-imaging, the currently available repertoire is largely designed to introduce a single halogen per mol. This report makes the selective introduction of several different halogens accessible. Showcased here is the privileged stability of nontoxic aryl germanes under harsh fluorination conditions (that allow selective fluorination in their presence), while displaying superior reactivity and functional-group tolerance in electrophilic iodinations and brominations, out-competing silanes or boronic esters under rapid and additive-free conditions. Mechanistic experiments and computational studies suggest a concerted electrophilic aromatic substitution as the underlying mechanism.

Angewandte Chemie, International Edition published new progress about Arylboronic acids Role: RCT (Reactant), RACT (Reactant or Reagent) (chemoselective germane functionalization over boronic acids, boronic esters and silanes). 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, SDS of cas: 576-83-0.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Belov, Dmitry S.; Mathivathanan, Logesh; Beazley, Melanie J.; Martin, William Blake; Bukhryakov, Konstantin V. published the artcile< Stereospecific Ring-Opening Metathesis Polymerization of Norbornene Catalyzed by Iron Complexes>, Synthetic Route of 576-83-0, the main research area is stereospecific ring opening metathesis polymerization norbornene catalyzed iron; iron; metathesis; norbornene; ring-opening polymerization; syndiotactic.

Developing well-defined iron-based catalysts for olefin metathesis would be a breakthrough achievement in the field not only to replace existing catalysts by inexpensive metals but also to attain a new reactivity taking advantage of the unique electronic structure of the base metals. Here, we present a two-coordinate homoleptic iron complex, Fe(HMTO)2 [HMTO=O-2,6-(2,4,6-Me3C6H2)2C6H3], that is capable of performing ring-opening metathesis polymerization of norbornene to produce highly stereoregular polynorbornene (99% cis, syndiotactic). The use of heteroleptic Fe(HMTO)(RO) [RO=(CH3)2CF3CO, CH3(CF3)2CO, or Ph(CF3)2CO] prepared in situ significantly increases the polymerization rate while preserving selectivity. The resulting polymers were characterized by 1H and 13C NMR spectroscopy and gel-permeation chromatog.

Angewandte Chemie, International Edition published new progress about Electronic structure. 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, Synthetic Route of 576-83-0.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Adachi, Yohei; Arai, Fuka; Sakabe, Mitsuru; Ohshita, Joji published the artcile< Effect of the conjugation pathway on the electronic structures of p-π* conjugated polymers with fused borepin units>, SDS of cas: 576-83-0, the main research area is fused borepin pi conjugated polymer electronic structure conjugation effect.

Among conjugated materials, p-π* conjugated polymers have attracted much attention due to their unique electronic structures derived from the orbital interaction between the empty p-orbital on boron and the π*-orbitals of the adjacent π-systems. On the other hand, borepin, an isoelectronic ring system of tropylium ions, has been investigated as an aromatic system containing heteroatoms. In this work, the first examples of p-π* conjugated polymers consisting of tetracyclic borepin structures with different conjugation pathways were prepared Optical investigations revealed that the borepin polymers have more extended conjugations than conventional p-π* conjugated polymers. Furthermore, the two borepin polymers exhibited drastically different optical responses when cyanide was added to the solution Photophys. measurements and DFT calculations disclosed the characteristic electronic effects of the borepin structures and the influence of different conjugation pathways.

Polymer Chemistry published new progress about Absorption spectra. 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, SDS of cas: 576-83-0.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Oi, Miku; Takita, Ryo; Kanazawa, Junichiro; Muranaka, Atsuya; Wang, Chao; Uchiyama, Masanobu published the artcile< Organocopper cross-coupling reaction for C-C bond formation on highly sterically hindered structures>, Related Products of 576-83-0, the main research area is organocopper compound aryl iodide cross coupling reaction mechanism.

A powerful, broadly applicable cross-coupling protocol that enabled carbon-carbon bond formation at highly sterically hindered carbon centers (both sp2 and sp3) by employing organocopper reagents under palladium catalysis was described. Exptl. studies and theor. calculations indicated that the key to the unique reactivity of copper was the relatively low activation energy of the compact transmetalation transition state, due to Cu(I)-Pd(II) interaction, which was associated with small values of deformation energy of the reactants. This reaction was applicable to a variety of bulky substrates, including compounds inert to previous cross-coupling chem. and has high functional group tolerance.

Chemical Science published new progress about Aryl bromides Role: PRP (Properties), RCT (Reactant), RACT (Reactant or Reagent). 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, Related Products of 576-83-0.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Li, Chenglong; Shi, Yafei; Li, Pengfei; Zhang, Niu; Wang, Nan; Yin, Xiaodong; Chen, Pangkuan published the artcile< Access to Highly Luminescent N-Doped Diazaborepins with Penta-, Hexa-, and Heptagon Substructures>, Safety of 2,4,6-Trimethylbromobenzene, the main research area is luminescent N doped diazaborepin.

Two diazaborepins (BNN1 and BNN2) have been accomplished via a highly efficient pathway in the step-economic transformation. Oxidative dimerization of carbazole derivatives followed by borylation reaction gave heterocyclic diazaborepin as the key building block. Replacement of carbon moiety in traditional borepins with N-N functionality led to a significant red shift of their emissions up to 585 nm with strong red color as solids. This work offered an approach to diazaborepin-based materials for applications in light-emitting field.

Organic Letters published new progress about Borylation. 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, Safety of 2,4,6-Trimethylbromobenzene.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Zhen, Cian-Jhe; Lu, Shu-Feng; Lin, Min-Hwa; Wu, Jay-Tai; Chao, Ito; Lin, Chih-Hsiu published the artcile< Singlet Biradical Versus Triplet Biradical/Zwitterion Characteristics in Isomers of C6-C5-C6-C7-C6-Fused Pentacyclic Aromatic Hydrocarbons Revealed through Reactivity Patterns>, Category: bromides-buliding-blocks, the main research area is fused pentacyclic aromatic hydrocarbon biradical zwitterion structure property relationship; biradical; polycyclic aromatic hydrocarbons; structure property relationship; zwitterion.

Among various polycyclic aromatic hydrocarbons, C6-C5-C6-C7-C6 fused pentacyclic aromatic hydrocarbons have the unique potential to adopt quinonoid, zwitterion, singlet, or triplet biradical electronic configurations. Two such hybrid structures between pentacene and azulene were synthesized and their ground state electronic configurations were deduced from the reactivity patterns they exhibit resp. Compound I, where the radicaloid carbons are linked through a para-phenylene, forms a head-to-head dimer like a singlet biradical. In contrast, isomer II, where the para-linkage was switched to meta, reacts readily with oxygen which resembles the reactivity of a triplet state. The oxidized intermediate(s) then underwent rearrangement to furnish the C6-C5-C6-C6-C6 ring contraction product 11,13-Dimesityl-13H-indeno[1,2-b]anthracene-6-carbaldehyde. Cation 12,14-Dimesityl-12,14-dihydrobenzo[5,6]cyclohepta[1,2-b]fluoren-12-ylium tetrafluoroborate, the protonated form of compound II, was synthesized, which implies compound II also reacts like a zwitterion. It was revealed the oxidative rearrangement takes place even with mesityl dibenzotropylium cation despite its perceived aromaticity. DFT calculations confirm the most stable forms of compound I and compound II are singlet and triplet diradical, which is consistent with the observed reactivity of resp. mols.

Chemistry – A European Journal published new progress about Biradicals Role: FMU (Formation, Unclassified), FORM (Formation, Nonpreparative). 576-83-0 belongs to class bromides-buliding-blocks, and the molecular formula is C9H11Br, Category: bromides-buliding-blocks.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary