Tag: M.W=300-350

Anderson, Trent E. published the artcilePoly(2,3-dihexylthieno[3,4- b ]pyrazine- alt -2,3-dihexylquinoxaline): Processible, Low-Bandgap, Ambipolar-Acceptor Frameworks via Direct Arylation Polymerization, Formula: C4Br2N2O4S, the publication is Synlett (2018), 29(19), 2542-2546, database is CAplus.

The synthesis of a new dialkyl-functionalized quinoxaline acceptor, 5,8-dibromo-2,3-dihexylquinoxaline, is reported, along with its cross-coupling with 2,3-dihexylthieno[3,4- b]pyrazine via direct arylation polymerization The resulting ambipolar-acceptor polymer poly(2,3-dihexylthieno[3,4- b]pyrazine- alt-2,3-dihexylquinoxaline) exhibits a low bandgap of 1.07 eV and high solubility The results of initial organic photovoltaic devices are also reported.

Synlett 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, Formula: C4Br2N2O4S.

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

Zang, Na published the artcileSynthesis and properties of a novel porphyrin and its zinc complex, Synthetic Route of 1207448-58-5, the publication is Wuji Huaxue Xuebao (2009), 25(5), 781-786, database is CAplus.

One novel asymmetry porphyrin (5,10,15-triphenyl-20-{4-[6′-(4”-o-salicylidene)-phenylammonio]hexanoxo}phenylporphyrin) and its zinc complex were synthesized and characterized by ¹H NMR, MS and UV-Vis. By means of spectrophotometer technique, the thermodn. properties of the coordination reaction of zinc porphyrin with four substituted imidazoles were investigated. The reaction is an exothermic process with increase in entropy. For substituted imidazoles, the standard equilibrium constants decrease in the order of K^–(2-MeIm)>K^–(N-MeIm)K^–(2-Et-4-MeIm)>K^–(Im). The nonlinear optical property of porphyrin and its zinc complexes were studied by Z-scan experiment

Wuji Huaxue Xuebao 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 C3H8N2S, Synthetic Route of 1207448-58-5.

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

Arrechea-Marcos, I. published the artcileMolecular aggregation of naphthalimide organic semiconductors assisted by amphiphilic and lipophilic interactions: a joint theoretical and experimental study, Name: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Physical Chemistry Chemical Physics (2017), 19(8), 6206-6215, database is CAplus and MEDLINE.

Amphiphilic and lipophilic donor-acceptor naphthalimide-oligothiophene assemblies exhibiting almost identical intramol. properties, but differing in their intermol. interactions, were synthesized. Here the authors analyze the effect of replacing the normally used lipophilic alkyl chains with hydrophilic ones in directing mol. aggregation from an antiparallel to a parallel stacking. This different mol. packing of the amphiphilic, NIP-3T_Amphi, and lipophilic, NIP-3T_Lipo, systems is assessed by electronic spectroscopies, scanning electronic microscopy and DFT quantum-chem. calculations Theor. calculations indicate that the presence of amphiphilic interactions promotes a face-to-face parallel arrangement of neighbor mols., which induces improved electronic coupling and therefore enhances the charge transport ability and photoconducting properties of this type of materials. Time of flight and photoconducting measurements are used to determine the impact of the amphiphilic and lipophilic interactions on their possible performance in optoelectronic devices.

Physical Chemistry Chemical 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, Name: 2,5-Dibromo-3,4-dinitrothiophene.

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

Ashley, Andrew E. published the artcileHomoleptic Permethylpentalene Complexes: “Double Metallocenes” of the First-Row Transition Metals, Formula: C4H10Br2CoO2, the publication is Journal of the American Chemical Society (2008), 130(46), 15662-15677, database is CAplus and MEDLINE.

The synthesis of the bimetallic permethylpentalene complexes Pn^*₂M₂ (M = V, Cr, Mn, Co, Ni; Pn^* = C₈Me₆) was accomplished, and all of the complexes were structurally characterized in the solid state by single-crystal x-ray diffraction. Pn^*₂V₂ (1) and Pn^*₂Mn₂ (3) show very short intermetallic distances that are consistent with metal-metal bonding, while the Co centers in Pn^*₂Co₂ (4) exhibit differential bonding to each side of the Pn^* ligand that is consistent with an η⁵:η³ formulation. The Pn^* ligands in Pn^*₂Ni₂ (5) are best described as η³:η³-bonded to the metal centers. ¹H NMR studies indicate that all of the Pn^*₂M₂ species exhibit D_2h mol. symmetry in the solution phase; the temperature variation of the chem. shifts for the resonances of Pn^*₂Cr₂ (2) indicates that the mol. has an S = 0 ground state and a thermally populated S = 1 excited state and can be successfully modeled using a Boltzmann distribution (ΔH° = 14.9 kJ mol^-1 and ΔS° = 26.5 J K^-1 mol^-1). The solid-state molar magnetic susceptibility of 3 obeys the Curie-Weiss law with μ_eff = 2.78 μB and θ = -1.0 K; the complex is best described as having an S = 1 electronic ground state over the temperature range 4-300 K. Paradoxically, attempts to isolate the double ferrocene equivalent, Pn^*₂Fe₂, led only to the isolation of the permethylpentalene dimer Pn^*₂ (6). Solution electrochem. studies were performed on all of the organometallic compounds; 2-5 exhibit multiple quasi-reversible redox processes. D. functional theory calculations were performed on this series of complexes to rationalize the observed structural and spectroscopic data and provide estimates of the M-M bond order.

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, Formula: C4H10Br2CoO2.

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

Sun, Pengfei published the artcileThienothiadiazole-Based NIR-II Dyes with D-A-D Structure for NIR-II Fluorescence Imaging Systems, COA of Formula: C4Br2N2O4S, the publication is ACS Applied Bio Materials (2021), 4(5), 4542-4548, database is CAplus and MEDLINE.

Fluorescence imaging (FI) in the second near-IR optical window (NIR-II, 1000-1700 nm) has received increasing focus due to its capacity of high spatiotemporal resolution, rapid real-time imaging, and deep penetration depth. In addition, D-A-D-based organic small mols. have also attracted wide attention due to their designed chem. structure and rapid renal metabolism However, most of the fluorescent cores were based on benzobisthiadiazole (BBTD) and 6,7-diphenyl-[1,2,5]thiadiazolo[3,4-g]quinoxaline (TTQ). The design and development of fluorescent core still remain challenging. Therefore, two NIR-II dyes based on the acceptor 4,6-di(2-thienyl)thieno[3,4-c][1,2,5]thiadiazole (TTDT) were designed and developed with donors tributyl(5-(9,9-dioctyl-9H-fluoren-2-yl)thiophen-2-yl)stannane (TF) and (5-(9,9′-spirobi[fluoren]-2-yl)thiophen-2-yl)tributylstannane (TSF) by the Stille coupling reaction, resp. Subsequently, the corresponding nanoparticles were prepared, and then TTDT-TF-based nanoparticles with superior photostability and strong NIR-II fluorescence signals were chosen for NIR-II FI. More importantly, the in vivo experiments suggested that TTDT-TF NPs exhibited significant accumulation at tumor sites and high signal-to-background ratio (SBR). The two D-A-D-type fluorophores based on TTDT have potential for NIR-II FI with superior imaging quality and imaging-guided surgery or therapy.

ACS Applied Bio 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 C19H17N3O, COA of Formula: C4Br2N2O4S.

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

Lai, Yu-Ying published the artcileSynthesis, photophysical and photovoltaic properties of a new class of two-dimensional conjugated polymers containing donor-acceptor chromophores as pendant groups, Category: bromides-buliding-blocks, the publication is Polymer Chemistry (2013), 4(11), 3333-3344, database is CAplus.

A new design for constructing two-dimensional conjugated copolymers with the D₁-A(D₂) repeating pattern (A: acceptor, D₁: donor 1, D₂: donor 2; mols. enclosed in parentheses are pendant groups.), is proposed. D₁ and A are employed to construct the linear main-conjugated polymer chain and D₂ is situated at the conjugated side chains connected to A. We designed and synthesized a series of D₁-A(D₂)-type copolymers, in which D₁ = diindeno[1,2-b:2′,1′-d]-thiophene (DIDT) or fluorene (F), A(D₂) = bis-[4-(dioctylamino)-phenyl] quinoxaline (DOAQX) or bis-[4-(dioctylamino)-phenyl] thieno[3,4-b]pyrazine (DOATP), and D₂ = N,N-dioctylanilines. The resultant copolymers, PDIDTDOAQX, PFDOAQX, PDIDTDOATP and PFDOATP, possess at least two strong ICT absorptions, thus resulting in better light harvesting. Their optical and electronic properties were thoroughly investigated exptl. and computationally. Bulk heterojunction photovoltaic cells on the basis of ITO/PEDOT:PSS/polymer:PC₇₁BM/Ca/Al configuration were fabricated and characterized. The photovoltaic performances of the devices incorporating these polymers follow the sequence: PDIDTDOAQX > PFDOAQX > PDIDTDOATP > PFDOATP, which is in good agreement with the magnitude of their hole-mobilities.

Polymer 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

Chochos, Christos L. published the artcileExperimental and theoretical investigations on the optical and electrochemical properties of π-conjugated donor-acceptor-donor (DAD) compounds toward a universal model, Computed Properties of 52431-30-8, the publication is Journal of Chemical Physics (2018), 149(12), 124902/1-124902/9, database is CAplus and MEDLINE.

A series of nine (9) donor-acceptor-donor (DAD) π-conjugated small mols. were synthesized via palladium catalyzed Stille aromatic cross-coupling reactions by the combination of six (6) heterocycle building blocks (thiophene, furan, thiazole, 2,1,3-benzothiadiazole, 2,1,3-pyridinothiadiazole, thienothiadiazole) acting as electron donating (thiazole, furan, thiophene) and electron deficient (benzothiadiazole, pyridinethiadiazole, thienothiadiazole) units. These model compounds enable determining the correspondence between the theor. and exptl. optical and electrochem. properties for the first time, via D. Functional Theory (DFT), time-dependent DFT, UV-Vis spectroscopy, and cyclic voltammetry, accordingly. The obtained theor. models can be utilized for the design and synthesis of new DAD structures with precise optical bandgaps, absorption maxima, and energy levels suitable for different optoelectronic applications. (c) 2018 American Institute of Physics.

Journal of Chemical 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, Computed Properties of 52431-30-8.

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

Cheng, Yen-Ju published the artcileThieno[3,2-b]pyrrolo donor fused with benzothiadiazolo, benzoselenadiazolo and quinoxalino acceptors: Synthesis, characterization, and molecular properties, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Organic Letters (2011), 13(20), 5484-5487, database is CAplus and MEDLINE.

Nitrogen-bridged donor-acceptor multifused dithienopyrrolobenzothiadiazole (DTPBT) and dibenzothiadiazolopyrrolothiophene (DBTPT) were successfully synthesized by intramol. Cadogan annulation. The electron-deficient benzothiadiazole unit in DTPBT can be converted to benzoselenadiazole and quinoxaline moieties through reduction/cyclization to generate dithienopyrrolobenzoselenadiazole (DTPBSe) and dithienopyrroloquinoxaline (DTPQX), resp. The nitrogen atoms function as the bridges for covalent planarization to induce intermol. interaction and intramol. charge transfer.

Organic Letters 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, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

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

Gao, Caiyan published the artcileIn situ oxidation synthesis of p-type composite with narrow-bandgap small organic molecule coating on single-walled carbon nanotube: flexible film and thermoelectric performance, Formula: C4Br2N2O4S, the publication is Small (2018), 14(12), n/a, database is CAplus and MEDLINE.

Although composites of organic polymers or n-type small mol./carbon nanotube (CNT) have achieved significant advances in thermoelec. (TE) applications, p-type TE composites of small organic mols. as thick surface coating layers on the surfaces of inorganic nanoparticles still remain a great challenge. Taking advantage of in situ oxidation reaction of thieno[3,4-b]pyrazine (TP) into TP di-N-oxide (TPNO) on single-walled CNT (SWCNT) surface, a novel synthesis strategy is proposed to achieve flexible films of TE composites with narrow-bandgap (1.19 eV) small mol. coating on SWCNT surface. The TE performance can be effectively enhanced and conveniently tuned by poly(sodium-p-styrenesulfonate) content, TPNO/SWCNT mass ratio, and posttreatment by various polar solvents. The maximum of the composite power factor at room temperature is 29.4 ± 1.0 μW m^-1 K^-2. The work presents a way to achieve flexible films of p-type small organic mol./inorganic composites with clear surface coating morphol. for TE application.

Small 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, Formula: C4Br2N2O4S.

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