Tag: M.W=300-350

Chaudhuri, N. Ray published the artcileNonisothermal studies of adduct molecules of metallic halides with oxo compounds in solid state. III, SDS of cas: 18346-57-1, the publication is Bulletin of the Chemical Society of Japan (1975), 48(10), 2837-41, database is CAplus.

Nonisothermal studies of some adduct mols. of metal halides with ethylene glycol dimethyl ether (L) of the type MX2Ly in solid state were carried out with a derivatograph, where M = Mn(II), Co(II), Ni(II), Cu(II) or Cd(II), X = Cl- or Br-, and y = 0.5-1. These adduct mols. lost L in single or multiple steps upon heating. Thermally stable intermediate products were isolated and characterized by elemental anal. and ir spectral measurement. The activation energy for each step of decomposition of the adduct was evaluated from the anal. of thermogravimetry, differential thermogravimetry, and DTA curves of the resp. derivatograms. Enthalpy change was evaluated from the DTA peak area and the order of reaction was unity for each step of decomposition Thermal parameters for the above adducts were compared with those for the corresponding type of adducts with oxo-compounds like dioxane or THF.

Bulletin of the Chemical Society of Japan 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, SDS of cas: 18346-57-1.

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

Dong, Changshuai published the artcileAn n-type narrow-bandgap organoboron polymer with quinoidal character synthesized by direct arylation polymerization, COA of Formula: C4Br2N2O4S, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2022), 10(7), 2718-2723, database is CAplus.

Narrow bandgap conjugated polymers have received great attention due to their wide applications in optoelectronic devices. Because of the synthetic difficulty, it is greatly challenging to develop n-type conjugated polymers with a narrow bandgap with quinoidal character. Herein, we report an n-type narrow-bandgap organoboron polymer with quinoidal character, PBN-TP. PBN-TP is designed with alternating units of BNBP (double B ← N bridged bipyridine) and quinoidal TP (thieno[3,4-b]pyrazine). Direct arylation polymerization of the di-bromo BNBP unit and the di-hydro TP unit affords the organoboron polymer with a high number-average mol. weight of 28.3 kDa. Compared with the control polymer with alternating units of BNBP and thiophene, PBN-T, the replacement of the thiophene unit with a quinoidal TP unit reduces the bond length alternation (BLA) of carbon-carbon bonds and planarized the polymer backbone of PBN-TP, leading to an enhanced contribution of the polymer quinoidal resonance structure. As a result, compared with PBN-T, PBN-TP shows a much reduced bandgap of 1.50 eV, which is among the lowest reported for n-type organoboron polymers based on BNBP. Moreover, due to the low LUMO energy level, PBN-TP could be readily n-doped and used as an n-type polymer thermoelec. material. This work provides a new n-type narrow bandgap conjugated polymer with quinoidal character.

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, COA of Formula: C4Br2N2O4S.

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

Sharma, G. D. published the artcileDithienylthienothiadiazole-based organic dye containing two cyanoacrylic acid anchoring units for dye-sensitized solar cells, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is RSC Advances (2012), 2(30), 11457-11464, database is CAplus.

A new dithienylthienothiadiazole-based organic dye (D) was synthesized by a seven-step synthetic route for use as a sensitizer in dye sensitized solar cells (DSSCs). The dye contains a dithienylthienothiadiazole central unit and two cyanoacrylic acid anchoring side groups. Optical and electrochem. properties of D were evaluated. In addition, d. functional theory (DFT) and time dependent d. functional theory (TD-DFT) calculations were carried out. A favorable electronic excitation from the HOMO (HOMO) to the LUMO (LUMO) indicated that the dye can be used as a sensitizer for DSSC applications. The photovoltaic properties of laboratory scale optimized DSSCs sensitized with D showed a power conversion efficiency (PCE) of 4.22%, which was further improved to 5.47% upon the addition of chenodeoxylic acid (CDCA) as a coadsorbant.

RSC Advances 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 C2H8Cl2N4S2, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

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

Chen, Yi-Sheng published the artcileNew Exciplex-Forming Co-Host System and Thienothiadazole-based Fluorescent Emitter for High-Efficiency and Promising Stability Near-Infrared OLED, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Advanced Optical Materials (2022), 10(4), 2101952, database is CAplus.

Two new spirobifluorene (SF)-centered donors (D) DPSF and DTSF are developed to blend with acceptor (A) CN-T2T for exciplex formation. The transient photoluminescence characterizations of pristine donor and D:A blended films verify the donor aggregates emissions that lead to relatively low photoluminescence quantum yield (PLQY) of exciplex emission. However, the charge recombination at lower energy exciplex state leads the device with DPSF:CN-T2T blend to give electroluminescence (EL) λ_max of 584 nm and external quantum efficiency (EQE) of 6.0%. The DPSF:CN-T2T exciplex excitons are efficiently extracted by a D-A-D-type fluorescence emitter TTDSF comprising thienothiadiazole core and SF peripherals via Forster energy transfer to give near-IR (NIR) emission (760 nm, PLQY 26%). After the electron-transporting layer thickness optimization, the device with DPSF:CN-T2T: 7 weight% TTDSF as emitting layer affords EL λmax 774 nm and EQE up to 5.3%, one of the best cases in NIR organic light-emitting diodes (OLEDs). More importantly, the device stability has been examined to display an excellent lifetime (LT95 > 200 h). This work manifests the judicious combination of an exciplex-forming co-host system and a designated NIR emitter equipping with a high quinoidal core and rigid peripheral SF groups that can realize an efficient NIR OLED.

Advanced Optical 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, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

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

Peng, Kai published the artcileNovel synthesis of poly(3,4-dinitro-thiophen-2-yl arylamine) derivatives via facile C-Br/N-H bulk polycondensation and its application of thermalsensor, Product Details of C4Br2N2O4S, the publication is Polymer (2020), 122550, database is CAplus.

C-Br/N-H bulk polycondensation is firstly proposed and corresponding poly(3,4-dinitro-thiophen-2-yl arylamine)s derivatives have been successfully obtained with quant. yield. Typical crystal anal. reveals that its effective reaction points distance (RPD, distance between Br and H atom) is 5.083 Å, which is 66.7% longer than the sum of van der Waals radius (r_w) of bromine and hydrogen atoms (3.05 Å). Carbazole-based monomer was explored as a thermalsensor with excellent relative sensitivity (S_a) of 0.45% K^-1.

Polymer 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, Product Details of C4Br2N2O4S.

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

Chen, Yi-Sheng published the artcileNew Exciplex-Forming Co-Host System and Thienothiadazole-based Fluorescent Emitter for High-Efficiency and Promising Stability Near-Infrared OLED, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene, the publication is Advanced Optical Materials (2022), 10(4), 2101952, database is CAplus.

Two new spirobifluorene (SF)-centered donors (D) DPSF and DTSF are developed to blend with acceptor (A) CN-T2T for exciplex formation. The transient photoluminescence characterizations of pristine donor and D:A blended films verify the donor aggregates emissions that lead to relatively low photoluminescence quantum yield (PLQY) of exciplex emission. However, the charge recombination at lower energy exciplex state leads the device with DPSF:CN-T2T blend to give electroluminescence (EL) λ_max of 584 nm and external quantum efficiency (EQE) of 6.0%. The DPSF:CN-T2T exciplex excitons are efficiently extracted by a D-A-D-type fluorescence emitter TTDSF comprising thienothiadiazole core and SF peripherals via Forster energy transfer to give near-IR (NIR) emission (760 nm, PLQY 26%). After the electron-transporting layer thickness optimization, the device with DPSF:CN-T2T: 7 weight% TTDSF as emitting layer affords EL λmax 774 nm and EQE up to 5.3%, one of the best cases in NIR organic light-emitting diodes (OLEDs). More importantly, the device stability has been examined to display an excellent lifetime (LT95 > 200 h). This work manifests the judicious combination of an exciplex-forming co-host system and a designated NIR emitter equipping with a high quinoidal core and rigid peripheral SF groups that can realize an efficient NIR OLED.

Advanced Optical 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, Recommanded Product: 2,5-Dibromo-3,4-dinitrothiophene.

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

Peng, Kai published the artcileNovel synthesis of poly(3,4-dinitro-thiophen-2-yl arylamine) derivatives via facile C-Br/N-H bulk polycondensation and its application of thermalsensor, Product Details of C4Br2N2O4S, the publication is Polymer (2020), 122550, database is CAplus.

C-Br/N-H bulk polycondensation is firstly proposed and corresponding poly(3,4-dinitro-thiophen-2-yl arylamine)s derivatives have been successfully obtained with quant. yield. Typical crystal anal. reveals that its effective reaction points distance (RPD, distance between Br and H atom) is 5.083 Å, which is 66.7% longer than the sum of van der Waals radius (r_w) of bromine and hydrogen atoms (3.05 Å). Carbazole-based monomer was explored as a thermalsensor with excellent relative sensitivity (S_a) of 0.45% K^-1.

Polymer 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, Product Details of C4Br2N2O4S.

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

Kim, Hyeokjun published the artcileContribution of dark current density to the photodetecting properties of thieno[3,4-b]pyrazine-based low bandgap polymers, Related Products of bromides-buliding-blocks, the publication is Dyes and Pigments (2022), 109910, database is CAplus.

Recently, near IR (NIR) organic photodetectors (OPDs) have been extensively studied. Bulk heterojunction NIR OPDs composed of a high-bandgap polymer donor (PD) and a low-bandgap non-fullerene acceptor (NFA) showed the best performance, whereas the low-bandgap PD-based OPDs were relatively unsuccessful due to the high level of dark c.d. (J_d) under a neg. bias. In this study, we synthesized three low-bandgap PDs based on a thieno[3,4-b]pyrazine (TP) moiety and developed red-NIR OPDs by blending them with a low-bandgap NFA. We found that the PD having a shallow HOMO energy level generated the largest ground-state electron transfer at neg. bias, which overestimated the responsivity (R) and detectivity (D*) in OPDs. Notably, under weak light irradiation of 0.1 mW/cm² at -2V, the contribution of J_d on J_ph reached 99.6%. Thus, we modified the existing R and D* equations to better understand photodetecting properties at low light intensity, and these modified equations gave more realistic R and D* values in OPDs. On the other hand, a low-bandgap PD showing low J_d in OPDs was highly beneficial to detect a low light signal because the J_d negligibly contributed to J_ph in OPDs. The low J_d values of OPDs at neg. bias resulted in a high on/off signal ratio and constant R and D* values at different light intensities.

Dyes and Pigments 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

Lian, Zhe published the artcileSignificant enhancement of light-harvesting efficiency through the formation of [2]pseudorotaxane with γ-cyclodextrin based on a bolaamphiphile of salicylaldehyde azine moiety, Product Details of C13H17BrO3, the publication is Dyes and Pigments (2019), 475-480, database is CAplus.

In this work, we have designed and synthesized a bolaamphiphile of salicylaldehyde azine (BSA), which can form [2]pseudorotaxane with γ-cyclodextrin (BSA@γ-CD) in aqueous solution and exhibit remarkable enhancement of the fluorescence emission. Both BSA and BSA@γ-CD assembly can spontaneously form spherical aggregates in aqueous solution with diameter at about 30 nm and 20 nm, resp. By using BSA and BSA@γ-CD as energy donor and sulforhodamine 101 (SR101) as energy acceptor, we fabricated two artificial light-harvesting systems in aqueous solution Significantly, an efficient energy transfer process was revealed to occur between the BSA or BSA@γ-CD assembly and the loaded SR101 to obtain high energy transfer efficiency and antenna effect. More importantly, energy transfer efficiency and antenna effect can be greatly improved in these two systems only just by addition of γ-CD.

Dyes and Pigments 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, Product Details of C13H17BrO3.

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

Huber, Johannes published the artcileNanoparticles of Low Optical Band Gap Conjugated Polymers, Computed Properties of 52431-30-8, the publication is Macromolecules (Washington, DC, United States) (2012), 45(19), 7799-7805, database is CAplus.

Sonogashira coupling of 9,9-bis(2-ethylhexyl)-2,7-diethynyl-9H-fluorene (1) with 2,7-dibromo-9,9-bis(2-ethylhexyl)-9H-fluorene (2) and dibromo-substituted electron accepting arylenes 5,7-bis(5-bromothiophen-2-yl)-2,3-dihexylthieno[3,4-b]pyrazine (3), 4,7-bis(5-bromo-4-(2-ethylhexyl)thiophene-2-yl)bis(benzothiadiazole) (4) or 4,9-bis(5-bromo-4-(2-ethylhexyl)thiophen-2-yl)-6,7-dihexylthiadiazolo[3,4-g]quinoxaline (5), resp., in a miniemulsion polymerization process afforded colloidally stable dispersions of poly(arylene ethynylene) nanoparticles with an average size in the range of 50 to 120 nm. For these poly[1-alt-(2-co-X)] (X = 3, 4, or 5), poly(1-alt-3), poly(1-alt-4), and poly(1-alt-5) aqueous nanoparticle dispersions absorption occurs increasingly in the red and NIR regime with increasing incorporation of acceptor monomer, with a strong absorption up to λ_abs = 1 μm for poly(1-alt-4) dispersions. For poly[1-alt-(2-co-3)] nanoparticles fluorescence is also observed at λ_em = ca. 700 nm, which occurs at this long wavelength exclusively even at an incorporation of only 1 mol % of 3 due to energy transfer to the low-energy chromophores. An alternative postpolymn. approach by change of solvent quality yielded dilute aqueous dispersions of self-stabilized nanoparticles from an amphiphilic block copolymer, poly(ethylene glycol)-block-poly(1-alt-6)-block-poly(ethylene glycol) generated from alkyne-terminated poly(1-alt-6) via azide-alkyne coupling (6 = 4,7-bis(5-bromo-4-(2-ethylhexyl)thiophene-2-yl)benzothiadiazole), which fluoresce at λ_em max = 672 nm.

Macromolecules (Washington, DC, United States) 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