Tag: M.W=300-350

Mikroyannidis, J. A. published the artcileSynthesis and application of low band gap conjugated small molecules containing benzobisthiadiazole and thienothiadiazole central units for bulk heterojunction solar cells, Category: bromides-buliding-blocks, the publication is Journal of Materials Chemistry (2011), 21(12), 4679-4688, database is CAplus.

Two conjugated low band gap small mols. (SMs), M1 and M2, containing benzobisthiadiazole and thienothiadiazole central units, resp., were synthesized. Both SMs carried terminal cyanovinylene 4-nitrophenyl at both sides which were connected to the central unit with a thiophene ring. The long-wavelength absorption band was located at 591-643 nm and the optical band gap was 1.62-1.63 eV, which is lower than that of P3HT. These two SMs were studied as electron donor materials along with PCBM or F as electron acceptors for fabrication of bulk heterojunction (BHJ) organic photovoltaic devices. F is a modified PCBM which was previously synthesized and used as an electron acceptor for poly(3-hexylthiophene) (P3HT). The power conversion efficiency (PCE) for M1:PCBM, M1:F, M2:PCBM and M2:F was 1.05%, 2.02%, 1.23% and 2.72%, resp. The higher PCE for the devices with M2 as the electron donor was related to the improved hole mobility for M2. The improved PCE for the devices with F as the electron acceptor was attributed to the more intense absorption of F in the visible region than that of PCBM and also to the higher open circuit voltage resulting from the higher LUMO level of F. the authors have also fabricated devices with M2:F cast film from mixed solvents. The PCE for the BHJ devices with the as cast and thermally annealed M2:F (mixed solvents) is 3.34% and 3.65%, resp.

Journal of Materials Chemistry published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Category: bromides-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Esmer, Elif Nazli published the artcileNear infrared electrochromic polymers based on phenazine moieties, Related Products of bromides-buliding-blocks, the publication is Materials Chemistry and Physics (2011), 131(1-2), 519-524, database is CAplus.

New fused-aromatic quinoxaline and thieno[3,4-b]pyrazine based monomers; 10,12-bis(4-hexylthiophen-2-yl)dibenzo[f,h]thieno[3,4-b]quinoxaline (HTBQ) and 10,13-bis(4-hexylthiophen-2-yl)dipyrido[3,2-a:2′,3′-c]phenazine (HTPP) were synthesized. Electrochem. polymerization of HTBQ and HTPP were performed in acetonitrile/dichloromethane (ACN/DCM) solution containing LiClO₄/NaClO₄. Spectroelectrochem. behavior and switching ability of PHTBQ and PHTPP films were investigated by UV-vis spectroscopy. The polymer films showed reversible electrochem. oxidation with high contrast ratios in the NIR region with low switching times. PHTBQ revealed color changes between brick color and green in the reduced and oxidized states. PHTPP changed color from green to gray when the polymer film was switched between its redox states.

Materials Chemistry and Physics published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Related Products of bromides-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Kolay, Merve published the artcileSynthesis and optical properties of fused aromatic thienopyrazine based π-conjugated polymers, Application In Synthesis of 52431-30-8, the publication is Smart Materials and Structures (2011), 20(7), 075013/1-075013/6, database is CAplus.

Two new polythieno[3,4-b]pyrazine derivatives, poly-10,12-bis(4-hexylthiophen-2-yl)dibenzo[f,h] thieno[3,4-b]quinoxaline (PDBTQ) and poly-8,10-bis(4-hexylthiophen-2-yl)acenaphtho[1,2-b]thieno[3,4-e]pyrazine (PATP) were synthesized by electrochem. polymerization and their electrochem. properties reported. Electroactivity of the monomer and electrochem. redox behavior of its polymers were investigated by cyclic voltammetry. Spectroelectrochem. anal. was performed and the band gaps of the polymers were determined as 2.0 eV and 1.2 eV from the onset of the π-π* transitions of PDBTQ and PATP, resp. The polymer PDBTQ shows multicolored electrochromic behavior with five distinct states-orange (0.0 V), yellow (+0.30 V), brown (+0.50 V), green (+0.65 V), blue-gray (0.80 V); PATP has two distinct colors-transmissive gray (0.0 V) and green (+0.80 V). The polymers revealed superior optical contrast in the near-IR (NIR) region with fast switching times of less than 1 s.

Smart Materials and Structures published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Application In Synthesis of 52431-30-8.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Rawale, Dattatraya Gautam published the artcileLinchpins empower promiscuous electrophiles to enable site-selective modification of histidine and aspartic acid in proteins, Formula: C13H17BrO3, the publication is Chemical Science (2021), 12(19), 6732-6736, database is CAplus and MEDLINE.

The conservation of chemoselectivity becomes invalid for multiple electrophilic warheads during protein bioconjugation. Consequently, it leads to unpredictable heterogeneous labeling of proteins. Here, we report that a linchpin can create a unique chem. space to enable site-selectivity for histidine and aspartic acid modifications overcoming the pre-requisite of chemoselectivity.

Chemical Science published new progress about 1207448-58-5. 1207448-58-5 belongs to bromides-buliding-blocks, auxiliary class Bromide,Benzene,Phenol,Ether,Aldehyde, name is 4-((6-Bromohexyl)oxy)-2-hydroxybenzaldehyde, and the molecular formula is C13H17BrO3, Formula: C13H17BrO3.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Zhang, Kenan published the artcileAB-Versus AA+BB-Suzuki Polycondensation: A Palladium/Tris(tert-butyl)phosphine Catalyst Can Outperform Conventional Catalysts, Name: 2-(3-Bromo-5-methoxyphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, the publication is Macromolecular Rapid Communications (2020), 41(1), 1900521, database is CAplus and MEDLINE.

A Pd/Pt-Bu₃ catalyst having bulky, electron-rich ligands significantly outperforms conventional “step-growth catalysts” Pd(PPh₃)₄ and Pd(Po-Tol₃)₃ in the suzuki polycondensation of the AB-type arylene-based monomers, such as some of the substituted fluorenes, carbazoles, and phenylenes. In the AA+BB polycondensation, Pd/Pt-Bu₃ also performs better under homogeneous reaction conditions, in combination with the organic base Et₄NOH. The superior performance of Pd/Pt-Bu₃ is discussed in terms of its higher reactivity in the oxidative addition step and inherent advantages of the intramol. catalyst transfer, which is a key step joining catalytic cycles of the AB-polycondensation. These findings are applied to the synthesis of a carbazole-based copolymer designed for the use as a hole conductor in solution-processed organic light-emitting diodes.

Macromolecular Rapid Communications published new progress about 401797-04-4. 401797-04-4 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Ether,Boronate Esters,Boronic acid and ester, name is 2-(3-Bromo-5-methoxyphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and the molecular formula is C5H7NO, Name: 2-(3-Bromo-5-methoxyphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Katz, Thomas J. published the artcileSynthesis and properties of optically active helical metallocene oligomers, COA of Formula: C4H10Br2CoO2, the publication is Journal of the American Chemical Society (1993), 115(8), 3182-98, database is CAplus.

Syntheses are described for optically active oligomers, of I (R = H, SiMe₃) and CO⁺PF₆^–. The steps required have three essential features: (1) a bromine directs a photocyclization, blocking both the position it occupies and the one adjacent. (2) An acid scavenger (propylene oxide) prevents benzylic ethers from being eliminated during photocyclization. (3) The stereogenicity of one carbon controls the direction in which the helix winds. The oligomers are the first to be prepared in which metallocenes are joined by conjugated systems of double bonds. Their optical activity is very high. The cyclic voltammogram of the Co-containing oligomer of I (R = H) (II) shows two cathodic waves whose closeness implies that the interaction between adjacent units is weak. When II is reduced electrochem. on Pt, a film of neutral oligomers is produced. This film is conductive, and it catalyzes charge transfer. Its weight, measured using a quartz crystal microbalance after the amount of reduction was analyzed coulometrically, measured the mol. weight of II.

Journal of the American Chemical Society published new progress about 18346-57-1. 18346-57-1 belongs to bromides-buliding-blocks, auxiliary class Cobalt, name is Cobalt(II) dibromo(1,2-dimethoxyethane), and the molecular formula is C4H10Br2CoO2, COA of Formula: C4H10Br2CoO2.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Zhang, Qian published the artcileSynthesis, Structures, and Properties of BN-Dinaphthothiophenes: Influence of B and N Placement on Photophysical Properties and Aromaticity, Category: bromides-buliding-blocks, the publication is Journal of Organic Chemistry (2020), 85(12), 7877-7883, database is CAplus and MEDLINE.

Substitution of the C=C functionality with the isosteric and isoelectronic B-N moiety has emerged as a powerful way to expand the family of polycyclic aromatic hydrocarbons. In this paper, two types of BN-dinaphthothiophene (BN-DNT) derivatives with different B and N substitution patterns were synthesized in short steps from com. available materials. X-ray crystallog. anal. revealed that BN-DNT had rigid and planar frameworks. Their photophys. properties and the aromaticity of the BN rings of the BN-DNTs were slightly dependent on the B and N substitution patterns. However, their response toward fluoride anions was greatly dependent on the B and N substitution patterns.

Journal of Organic Chemistry published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C15H15OP, Category: bromides-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Ishiyama, Tatsuo published the artcileMild Iridium-Catalyzed Borylation of Arenes. High Turnover Numbers, Room Temperature Reactions, and Isolation of a Potential Intermediate, Safety of 2-(3-Bromo-5-methoxyphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, the publication is Journal of the American Chemical Society (2002), 124(3), 390-391, database is CAplus and MEDLINE.

The borylation of arenes leads to the formation of synthetically versatile products from unactivated arene reagents. It is reported that Ir(I) precursors in conjunction with bipyridine ligands catalyze in high yields the borylation of arenes under mild conditions. These reactions encompass arenes bearing both electron-withdrawing and electron-donating substituents. The temperatures required for the transformation are much lower than those previously reported for direct arene borylation. The combination of [Ir(COE)₂Cl]₂ and (4,4-di-t-butyl)bipyridine even allows for reaction at room temperature The same catalyst system at 100° provides remarkably high turnover numbers for a hydrocarbon functionalization process. Mechanistic studies show that the reactions involve uncommon, Ir(II) tris-boryl complexes. An example of this type of complex ligated by di-t-butylbipyridine, [Ir(COE)(Bpin)₃(4,4′-di-t-Bu-BPY)], was isolated and structurally characterized. It reacted rapidly at room temperature to produce aryl boronate esters in high yields.

Journal of the American Chemical Society published new progress about 401797-04-4. 401797-04-4 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Ether,Boronate Esters,Boronic acid and ester, name is 2-(3-Bromo-5-methoxyphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and the molecular formula is C13H18BBrO3, Safety of 2-(3-Bromo-5-methoxyphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Zhou, Jingyuan published the artcileTriazole-substituted phenylboronic acids as tunable lead inhibitors of KPC-2 antibiotic resistance, Application of 2-(5-(Bromomethyl)-2-fluorophenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, the publication is European Journal of Medicinal Chemistry (2022), 114571, database is CAplus and MEDLINE.

Inhibition of β-lactamases is a promising strategy to overcome antimicrobial resistance to commonly used β-lactam antibiotics. Boronic acid derivatives have proven to be effective inhibitors of β-lactamases due to their direct interaction with the catalytic site of these enzymes. We synthesized a series of phenylboronic acid derivatives and evaluated their structure-activity relationships as Klebsiella pneumoniae carbapenemase (KPC-2) inhibitors. We identified potent KPC-2 inhibitors 2e & 6c (Ki = 0.032 μM and 0.038 μM, resp.) that enhance the activity of cefotaxime in KPC-2 expressing Escherichia coli. The measured acid dissociation constants (pKa) of selected triazole-containing phenylboronic acids was broad (5.98-10.0), suggesting that this is an addnl. property of the compounds that could be tuned to optimize the target interaction and/or the physicochem. properties of the compounds These findings will help to guide the future development of boronic acid compounds as inhibitors of KPC-2 and other target proteins.

European Journal of Medicinal Chemistry published new progress about 1256360-47-0. 1256360-47-0 belongs to bromides-buliding-blocks, auxiliary class Fluoride,Bromide,Boronic acid and ester,Benzyl bromide,Benzene,Boronate Esters,Boronic Acids,Boronic acid and ester, name is 2-(5-(Bromomethyl)-2-fluorophenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and the molecular formula is C25H23NO4, Application of 2-(5-(Bromomethyl)-2-fluorophenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Akula, Suri Babu published the artcileThieno-imidazole based small molecule hole transport materials for dopant-free, efficient inverted (p-i-n) perovskite solar cells, Related Products of bromides-buliding-blocks, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2020), 8(46), 16577-16583, database is CAplus.

Two dipolar mols. based on a thieno-imidazole core, AI109 and AI112, were developed to study the effect of imparting polarity on the hole transport properties in inverted perovskite solar cells (PSCs). These hole transport materials (HTMs) exhibit comparable optoelectronic properties but distinct film morphol. and charge transport characteristics. Besides, the new materials with very low concentrations (1 mg mL-1) are able to form smooth and continuous films. The PSCs based on AI109 and AI112 without any dopants and addnl. interlayers have achieved increased power conversion efficiencies of 13.32% and 13.42%, resp., compared to those of the standard HTMs, 2,2′,7,7′-tetrakis(N,N′-di-p-methoxyphenylamino)-9,9′-spirobifluorene [Spiro-OMeTAD, (11.62%)] and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate [PEDOT:PSS, (12.01%)]. The excellent hole mobility and the superior film morphol. of the AI-HTMs account for their higher efficiencies.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices published new progress about 52431-30-8. 52431-30-8 belongs to bromides-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 2,5-Dibromo-3,4-dinitrothiophene, and the molecular formula is C4Br2N2O4S, Related Products of bromides-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary