Tag: M.W=300-350

King, Andrew J. published the artcileA Chain-Growth Mechanism for Conjugated Polymer Synthesis Facilitated by Dinuclear Complexes with Redox-Active Ligands, SDS of cas: 52431-30-8, the publication is Angewandte Chemie, International Edition (2022), 61(29), e202206044, database is CAplus and MEDLINE.

Conjugated polymers are widely used in energy conversion and sensor applications, but their synthesis relies on imprecise step-growth or narrow-scope chain-growth methods, typically based on transition metal (TM)-catalyzed cross-coupling. Here we report that a dinickel complex with a redox-active naphthyridine diimine ligand accesses new chain-growth mechanistic manifolds for both donor and acceptor conjugated polymers, represented by poly(3-hexylthiophene), poly(2,3-bis(2-ethylhexyl)thienopyrazine), and poly(2-(2-octyldodecyl)benzotriazole). For the latter, our method is particularly effective: we achieve high ds.p. (DP) (>100) with moderate dispersities (D) of ≈1.4. Mechanistic anal. supports a radical/radical anion chain-growth mechanism with organometallic intermediates instead of TM-catalyzed cross-couplings. Hence, our work develops new mechanisms for conjugated polymer synthesis and furnishes insights about the elementary reactivity of dinuclear complexes.

Angewandte Chemie, International Edition 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, SDS of cas: 52431-30-8.

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

Zhao, Xiaojuan published the artcileA supramolecular approach towards strong and tough polymer nanocomposite fibers, Quality Control of 1207448-58-5, the publication is RSC Advances (2018), 8(19), 10361-10366, database is CAplus and MEDLINE.

Polymer nanocomposite fibers are important one-dimensional nanomaterials that hold promising potential in a broad range of technol. applications. It is, however, challenging to organize advanced polymer nanocomposite fibers with sufficient mech. properties and flexibility. Here, we demonstrate that strong, tough and flexible polymer nanocomposite fibers can be approached by electrospinning of a supramol. ensemble of dissimilar and complementary components including flexible multiwalled carbon nanotubes (CNT), and stiff cellulose nanocrystals (CNC) in an aqueous poly(vinyl alc.) (PVA) system. CNT and CNC are bridged by a water-soluble aggregation-induced-emission (AIE) mol. that forms π-π stacking with CNT via its conjugated chains, and electrostatic attraction with CNC through its pos. charges leading to a soluble CNT-AIE-CNC ensemble, which further assembles with PVA through hydrogen bonds. A high level of ordering of the nanoscale building blocks combined with hydrogen bonding leads to a more efficient stress transfer path between the reinforcing unit and the polymer. The nanocomposite fiber mat is capable of selective detection of nitroarom. explosives.

RSC Advances 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 C8H17Br, Quality Control of 1207448-58-5.

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

Qi, Ji published the artcileOptimization of Solubility, Film Morphology and Photodetector Performance by Molecular Side-Chain Engineering of Low-Bandgap Thienothiadiazole-Based Polymers, HPLC of Formula: 52431-30-8, the publication is Advanced Functional Materials (2014), 24(48), 7605-7612, database is CAplus.

A series of donor-acceptor (D-A) type low-bandgap polymers containing the terthiophene and thieno[3,4-b]thiadiazole units in the main chain but different numbers of identical side chains are designed and synthesized in order to study the effect of side chain on the polymer properties and optimize the performance of polymer photodetectors. Variation in the side chain content can influence the polymer solubility, mol. packing, and film morphol., which in turn affects the photodetector performance, particularly with regard to the photoresponsivity and dark current. X-ray diffraction patterns indicate that mol. ordering increases with more side chains. Atomic force microscopy shows that appropriate morphol. of the active layer in the polymer photodetector is necessary for high photocurrent and low dark current. Using BCP as a hole blocking layer (10 nm), the photodetector based on P4 exhibits the optimized performance with specific detectivity of 1.4 × 10¹² Jones at 800 nm, which is among the best reported values for polymer photodetectors and even comparable to that of a silicon photodetector.

Advanced Functional Materials 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, HPLC of Formula: 52431-30-8.

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

Cai, Tian-Qi published the artcileLow bandgap polymers synthesized by FeCl₃ oxidative polymerization, Category: bromides-buliding-blocks, the publication is Solar Energy Materials & Solar Cells (2010), 94(7), 1275-1281, database is CAplus.

Four low bandgap polymers, combining an alkyl thiophene donor with benzo[c][1,2,5]thiadiazole, 2,3-diphenylquinoxaline, 2,3-diphenylthieno[3,4-b]pyrazine and 6,7-diphenyl-[1,2,5]thiadiazolo[3,4-g]quinoxaline acceptors in a donor-acceptor-donor architecture, were synthesized via FeCl₃ oxidative polymerization The mol. weights of the polymers were improved by introducing o-dichlorobenzene (ODCB) as the reaction solvent instead of the commonly used solvent, chloroform. The photophys., electrochem. and photovoltaic properties of the resulting polymers were investigated and compared. The optical bandgaps of the polymers vary between 1.0 and 1.9 eV, which is promising for solar cells. The devices spin-coated from an ODCB solution of P1DB:[70]PCBM showed a power conversion efficiency of 1.08% with an open-circuit voltage of 0.91 V and a short-circuit c.d. of 3.36 mA cm^-2 under irradiation from an AM1.5G solar simulator (100 mW cm^-2).

Solar Energy Materials & Solar Cells 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

Liu, Xiaobo published the artcileCrowding-Induced Unconventional Phase Behaviors in Dendritic Rodlike Molecules via Side-Chain Engineering, HPLC of Formula: 957061-13-1, the publication is ACS Macro Letters (2021), 10(7), 844-850, database is CAplus and MEDLINE.

Dendritic mols. with a fanlike or conelike conformation are common mol. building blocks to construct supramol. columnar or spherical phases. Although it is well-accepted that the preferred mol. conformation of dendritic mols. dictates their packing schemes, manipulation of this crucial parameter usually requires significant changes in mol. structures and tedious synthetic efforts. Herein, we report a simple yet highly efficient strategy to tune the mol. conformation of dendritic rodlike mols. by adjusting the length of alkyl side chains tethered to the rods. Strikingly, tiny chem. structure differences can largely change the “crowding” near the branching point to induce the “fanlike to conelike” conformational transitions and thus result in the formation of diverse supramol. structures, including the columnar phase, double gyroid phase, and the unconventional Frank-Kasper σ and A15 phases. Our study provides a practical platform for further investigation of unconventional structure formation and phase transitions in soft matter.

ACS Macro Letters published new progress about 957061-13-1. 957061-13-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Ether,Boronate Esters, name is 2-(4-(3-Bromopropoxy)phenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and the molecular formula is C15H22BBrO3, HPLC of Formula: 957061-13-1.

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

Zhang, Bo published the artcile3,4-Dicyanothiophene-a Versatile Building Block for Efficient Nonfullerene Polymer Solar Cells, Quality Control of 52431-30-8, the publication is Advanced Energy Materials (2020), 10(12), 1904247, database is CAplus.

In this contribution, a versatile building block, 3,4-dicyanothiophene (DCT), which possesses structural simplicity and synthetic accessibility for constructing high-performance, low-cost, wide-bandgap conjugated polymers for use as donors in polymer solar cells (PSCs), is reported. A prototype polymer, PB3TCN-C66, and its cyano-free analog polymer PB3T-C66, are synthesized to evaluate the potential of using DCT in nonfullerene PSCs. A stronger aggregation property in solution, higher thermal transition temperatures with higher enthalpies, a larger dipole moment, higher relative dielec. constant, and more linear conformation are exhibited by PB3TCN-C66. Solar cells employing IT-4F as the electron acceptor offer power conversion efficiencies (PCEs) of 11.2% and 2.3% for PB3TCN-C66 and PB3T-C66, resp. Morphol. characterizations reveal that the PB3TCN-C66:IT-4F blend exhibits better π-π paracrystallinity, a contracted domain size, and higher phase purity, consistent with its higher mol. interaction parameter, derived from thermodn. calculations Moreover, PB3TCN-C66 offers a higher open-circuit voltage and reduced energy loss than most state-of-the-art wide-bandgap polymers, without the need of addnl. electron-withdrawing substituents. Two addnl. polymers derived from DCT also demonstrate promising performance with a higher PCE of 13.4% being achieved. Thus, DCT represents a versatile and promising building block for constructing high-performance, low-cost, conjugated polymers for application in PSCs.

Advanced Energy Materials 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 C12H16N2O2, Quality Control of 52431-30-8.

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

Xu, Zhen published the artcileColor tuning for black-to-transmissive conjugated copolymer with excellent electrochromic properties via electrochemical copolymerization of two donor-acceptor type monomers, Related Products of bromides-buliding-blocks, the publication is Materials & Design (2020), 108903, database is CAplus.

Copolymerization towards producing broadly absorbing black neutrality for flexible electrochromics was investigated. Neutral-state saturated green and dark blue donor-acceptor-donor (D-A-D) polymers consisting of electron-acceptor thieno[3,4-b]pyrazine and benzo[1,2,3]triazole based units resp., were chosen as distributed segments, simultaneous with their tendency to switch to transmissive oxidation states. Variation of the feed ratio of two precursors in a mixture solution was used to regulate the energy and spectral absorption range of electrochem. copolymerization films. Co-polymer PEM-11 in 1:1 monomer feed ratio demonstrated a full range of visible absorption, and switched between an improved saturated black neutral state (L* = 43.68, a* = 4.98, b* = -13.13) and a light gray transmissive oxidation state (L* = 67.30, a* = -1.36, b* = 1.67) reversibly, where L* represents white to black balance, a* red to green and b* yellow to blue, with the optical contrast of 35% at 590 nm and switching speed as low as 0.6 s. Furthermore, the PEM-11 film exhibited stable n-doping, favorable cycle stability, and a lower electrochem./optical band-gap (0.80 eV/1.21 eV) in comparison with the reported individual neutral black ECPs. The results suggested that the as-obtained copolymer could be a promising candidate for electrochromic windows, e-papers, or eyewear applications.

Materials & Design 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 C13H10F2, Related Products of bromides-buliding-blocks.

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

Lin, Zhiwei published the artcileTopologically Directed Assemblies of Semiconducting Sphere-Rod Conjugates, Category: bromides-buliding-blocks, the publication is Journal of the American Chemical Society (2017), 139(51), 18616-18622, database is CAplus and MEDLINE.

Spontaneous organizations of designed elements with explicit shape and symmetry are essential for developing useful structures and materials. We report the topol. directed assemblies of four categories (a total of 24) of sphere-rod conjugates, composed of a sphere-like fullerene (C₆₀) derivative and a rod-like oligofluorene(s) (OF), both of which are promising organic semiconductor materials. Although the packing of either spheres or rods has been well-studied, conjugates having both shapes substantially enrich resultant assembled structures. Mandated by their shapes and topologies, directed assemblies of these conjugates result not only in diverse unconventional semiconducting supramol. lattices with controlled domain sizes but also in tunable charge transport properties of the resulting structures. These results demonstrate the importance of persistent mol. topol. on hierarchically assembled structures and their final properties.

Journal of the American Chemical Society published new progress about 957061-13-1. 957061-13-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Ether,Boronate Esters, name is 2-(4-(3-Bromopropoxy)phenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane, and the molecular formula is C15H22BBrO3, Category: bromides-buliding-blocks.

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

Xiao, Zuo published the artcilePushing Fullerene Absorption into the Near-IR Region by Conjugately Fusing Oligothiophenes, HPLC of Formula: 52431-30-8, the publication is Angewandte Chemie, International Edition (2012), 51(36), 9038-9041, S9038/1-9038/27, database is CAplus and MEDLINE.

By fusing the π-electron systems of oligothiophene and fullerene through the open-cage strategy, the visible absorbance of fullerenes was significantly enhanced and pushed their absorption into NIR region. This optical property improvement concerns the following factors: (1) symmetry breaking of the fullerene by open-cage reactions allows more low-energy transitions to take place; (2) addnl. absorption is taken by external chromophore; and (3) strong cross-talking between the donor and acceptor in the conjugated system leads to ICT absorbance in the NIR region. Therefore, the open-cage strategy provides a promising approach for creating new materials with advanced optical properties. Future work is focused on developing novel NIR-absorbing fullerene materials and applying them in organic solar cells and nonlinear optics.

Angewandte Chemie, International Edition 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 C6H12N2O, HPLC of Formula: 52431-30-8.

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

Liyanage, Nalaka P. published the artcileThieno[3,4-b]pyrazine as an Electron Deficient π-Bridge in D-A-π-A DSCs, Synthetic Route of 52431-30-8, the publication is ACS Applied Materials & Interfaces (2016), 8(8), 5376-5384, database is CAplus and MEDLINE.

Thieno[3,4-b]pyrazine (TPz) is examined as an electron deficient π-bridge enabling near-IR (NIR) spectral access in dye-sensitized solar cells (DSCs). Seven dissym. dyes for DSCs were synthesized (NL2-NL8) with TPz as the π-bridge utilizing palladium catalyzed C-H activation methodol. C-H bond cross-coupling was uniquely effective among the cross-couplings and electrophilic aromatic substitution reactions analyzed in monofunctionalizing the TPz building block. The TPz-based NL2-NL8 dyes examine the effects of various donors, π-spacers, and acceptors within the donor-π bridge-acceptor (D-π-A) dye design. Proarom. TPz stabilizes the excited-state oxidation potential (E_s+/s*) of the dyes by maintaining aromaticity upon excitation of the dye mol. This leads to concise conjugated systems capable of accessing the NIR region. Through judicious structural modifications, dye band gaps were reduced to 1.48 eV, and power conversion efficiencies (PCEs) reached 7.1% in this first generation TPz-dye series.

ACS Applied Materials & Interfaces 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, Synthetic Route of 52431-30-8.

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