Month: November 2022

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

Nakum, Kiran J. published the artcileThe influence of lateral hydroxyl group and molecular flexibility on the mesogenic behavior of a new homologous series based on thiophene-chalcone: Synthesis, characterization, crystal structure and DFT study, Name: 1-Bromododecane, the publication is Journal of Molecular Structure (2022), 132891, database is CAplus.

A new homologous series of rod shaped calamite liquid crystals, I [R = Et, decyl, octadecyl, etc.] based on thiophene-chalcone was prepared by condensation of 2-hydroxy-4-n-alkoxybenzaldehydes (n = 2 to 8, 10, 12, 14, 16, 18) with (E)-1-(4-aminophenyl)-3-(thiophen-2-yl)prop-2-en-1-one. FT-IR, ¹H NMR, ¹³C NMR and mass spectroscopy were used to characterize synthesized compds I. The liquid crystal behavior of all synthetic compounds I was investigated using Differential Scanning Calorimeter (DSC) and Polarizing Optical Microscope (POM). Lower members of the homologous series, n-heptyloxy to n-dodecyloxy , were nematogenic, and higher members, n-tetradecyloxy to n-octadecyloxy , were smectogenic, whereas n-ethoxy to n-pentyloxy derivatives were non-mesogenic, and n-hexyloxy exhibited monotropic nematic phase. The n-pentyloxy derivative crystallized under monoclinic, space group P2/c with unit cell dimensions a = 16.1723(9) Å, b = 5.8603(3) Å, c = 22.4320(12) Å, β = 100.153(2) , V = 2092.69(9) Å3. The ethoxy derivative was subjected to DFT (d. functional theory) level computations and complete geometric optimization utilizing B3LYP/6-311G (d, p) basis sets and results were compared with structurally similar compound

Journal of Molecular Structure published new progress about 143-15-7. 143-15-7 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromododecane, and the molecular formula is C12H25Br, Name: 1-Bromododecane.

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

Nakum, Kiran J. published the artcileThe influence of molecular flexibility on the mesogenic behavior of a new homologous series based on azo-azomethine: Synthesis, characterization, photoisomerization and DFT study, Application In Synthesis of 111-83-1, the publication is Journal of Molecular Structure (2022), 131586, database is CAplus.

Through condensation of 2-hydroxy-4-alkoxybenzaldehydes 2-HO-4-ROC₆H₃CHO (R = ethoxy, propoxy, dodecyloxy, tetradodecyloxy, etc.) with (E)-4-((2,4-dimethylphenyl)diazenyl) benzene-1,3-diamine, new homologous series of rod shaped calamite liquid crystals based on azo-azomethine (E,E)-I have been prepared Differential Scanning Calorimeter (DSC) and Polarizing Optical Microscope (POM) are used to check the liquid crystal properties of all synthetic compounds In the homologous series, all the compounds are mesogenic; some of them are in the nematic phase; some of them appear in the smectic A phase, and some appear in the nematic and smectic A phases. UV-vis spectroscopy was used to study the photoisomerization in chloroform. DFT (D. functional theory) level calculations and complete geometric optimization of all synthetic compounds are performed using B3LYP/6-31+G (d,p) basis sets.

Journal of Molecular Structure published new progress about 111-83-1. 111-83-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromooctane, and the molecular formula is C8H17Br, Application In Synthesis of 111-83-1.

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

Nakum, Kiran J. published the artcileThe influence of lateral hydroxyl group and molecular flexibility on the mesogenic behavior of a new homologous series based on thiophene-chalcone: Synthesis, characterization, crystal structure and DFT study, Application In Synthesis of 111-83-1, the publication is Journal of Molecular Structure (2022), 132891, database is CAplus.

A new homologous series of rod shaped calamite liquid crystals, I [R = Et, decyl, octadecyl, etc.] based on thiophene-chalcone was prepared by condensation of 2-hydroxy-4-n-alkoxybenzaldehydes (n = 2 to 8, 10, 12, 14, 16, 18) with (E)-1-(4-aminophenyl)-3-(thiophen-2-yl)prop-2-en-1-one. FT-IR, ¹H NMR, ¹³C NMR and mass spectroscopy were used to characterize synthesized compds I. The liquid crystal behavior of all synthetic compounds I was investigated using Differential Scanning Calorimeter (DSC) and Polarizing Optical Microscope (POM). Lower members of the homologous series, n-heptyloxy to n-dodecyloxy , were nematogenic, and higher members, n-tetradecyloxy to n-octadecyloxy , were smectogenic, whereas n-ethoxy to n-pentyloxy derivatives were non-mesogenic, and n-hexyloxy exhibited monotropic nematic phase. The n-pentyloxy derivative crystallized under monoclinic, space group P2/c with unit cell dimensions a = 16.1723(9) Å, b = 5.8603(3) Å, c = 22.4320(12) Å, β = 100.153(2) , V = 2092.69(9) Å3. The ethoxy derivative was subjected to DFT (d. functional theory) level computations and complete geometric optimization utilizing B3LYP/6-311G (d, p) basis sets and results were compared with structurally similar compound

Journal of Molecular Structure published new progress about 111-83-1. 111-83-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromooctane, and the molecular formula is C8H17Br, Application In Synthesis of 111-83-1.

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

Simon, Meike published the artcileDiastereoselective Intramolecular Carbolithiations of Stereodefined Secondary Alkyllithiums Bearing a Remote Alkynylsilane, Application In Synthesis of 69361-41-7, the publication is Organic Letters (2018), 20(12), 3518-3521, database is CAplus and MEDLINE.

Various secondary alkyl iodides bearing a remote alkynylsilane underwent intramol. carbolithiations triggered by an I/Li-exchange performed at -100° using t-BuLi (2.5 equiv). The resulting alkenyllithiums were stereoselectively converted to tetrasubstituted cyclopentane exo-alkylidenes. After Pd-catalyzed hydrogenation, cyclopentanes and cis-bicyclo[4.3.0]nonanes were obtained with stereocontrol of four contiguous centers.

Organic Letters published new progress about 69361-41-7. 69361-41-7 belongs to bromides-buliding-blocks, auxiliary class PROTAC Linker,Aliphatic Linker, name is (4-Bromobut-1-yn-1-yl)trimethylsilane, and the molecular formula is C4H5ClN2S, Application In Synthesis of 69361-41-7.

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

O’Brien, Christopher J. published the artcileTowards the rational design of palladium-N-heterocyclic carbene catalysts by a combined experimental and computational approach, Application of (4-Bromobut-1-yn-1-yl)trimethylsilane, the publication is Tetrahedron (2005), 61(41), 9723-9735, database is CAplus.

A combined exptl. and computational approach towards the development of Pd-NHC catalysts is described. A range of benzimidazolylidinium ligands incorporating electron-rich and electron-poor substituents were prepared and evaluated in the Suzuki reaction. The most electron-rich ligand showed the highest catalytic activity. Based on this information, the first alkyl-alkyl Negishi cross-coupling reaction protocol was developed. Evaluation of N,N’-diaryl-(4,5-dihydro)imidazolylidinium ligands showed a strong dependence on the steric topog. around the metal center. A computational study of the most active ligand in the Negishi reaction, its Pd(0) and PdCl₂-complexes and related structures were modeled at the B3LYP/DZVP and HF/3-21G levels of theory. The potential energy hypersurfaces flattened with increase in ligand size. Binding energies were computed for carbene/Pd(0) adducts (in the range âˆ?1-40 kcal mol^-1), roughly double that for PH₃ (âˆ?6 kcal mol^-1). Weak intramol. interactions were found using AIM analyses.

Tetrahedron published new progress about 69361-41-7. 69361-41-7 belongs to bromides-buliding-blocks, auxiliary class PROTAC Linker,Aliphatic Linker, name is (4-Bromobut-1-yn-1-yl)trimethylsilane, and the molecular formula is C7H13BrSi, Application of (4-Bromobut-1-yn-1-yl)trimethylsilane.

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

Hadei, Niloufar published the artcileThe First Negishi Cross-Coupling Reaction of Two Alkyl Centers Utilizing a Pd-N-Heterocyclic Carbene (NHC) Catalyst, SDS of cas: 69361-41-7, the publication is Organic Letters (2005), 7(17), 3805-3807, database is CAplus and MEDLINE.

The development of an NHC-based system capable of cross-coupling sp³-sp³ centers in high yield has been a long-standing challenge. This communication describes the use of a Pd-NHC catalytic system that achieves room-temperature Negishi cross-couplings of unactivated, primary bromides and alkyl organozinc reagents with a variety of functionality. E.g., alkyl-alkyl Negishi cross-coupling of PhCH₂CH₂CH₂Br and BuZnBr in presence of Pd₂(dba)₃ and 1,3-bis(2,6-diisopropylphenyl)imidazolium chloride gave up to 75% heptylbenzene.

Organic Letters published new progress about 69361-41-7. 69361-41-7 belongs to bromides-buliding-blocks, auxiliary class PROTAC Linker,Aliphatic Linker, name is (4-Bromobut-1-yn-1-yl)trimethylsilane, and the molecular formula is C7H13BrSi, SDS of cas: 69361-41-7.

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

Hadei, Niloufar published the artcileRoom-Temperature Negishi Cross-Coupling of Unactivated Alkyl Bromides with Alkyl Organozinc Reagents Utilizing a Pd/N-Heterocyclic Carbene Catalyst, COA of Formula: C7H13BrSi, the publication is Journal of Organic Chemistry (2005), 70(21), 8503-8507, database is CAplus and MEDLINE.

A high-yielding cross-coupling reaction of unactivated alkyl bromides possessing β-hydrogens with alkylzinc halides utilizing a Pd/N-heterocyclic carbene (NHC) catalyst at room temperature is described. A variety of Pd sources, Pd₂(dba)₃, Pd(OAc)₂, or PdBr₂, with the com. available ligand precursor 1,3-bis(2,6-diisopropylphenyl)imidazolium chloride successfully coupled 1-bromo-3-phenylpropane with n-butylzinc bromide in THF/NMP. An investigation of different NHC precursors showed that the bulky 2,6-diisopropylphenyl moiety was necessary to achieve high coupling yields (75-85%). The corresponding Et analog was moderately active (11%). A range of unsym. NHC precursors were prepared and evaluated. The ligand precursor containing one 2,6-diisopropylphenyl and one 2,6-diethylphenyl afforded the coupling product in 47% yield, clearly suggesting a direct relationship between the steric topog. created by the flanking N-substituents and catalyst activity. Under optimal conditions, a number of alkyl bromides and alkylzinc halides possessing common functional groups (amide, nitrile, ester, acetal, and alkyne) were effectively coupled (61-92%). It is noteworthy that β-substituted alkyl bromides and alkylzinc halides successfully underwent cross-coupling. Also, under these conditions alkyl chlorides were unaffected.

Journal of Organic Chemistry published new progress about 69361-41-7. 69361-41-7 belongs to bromides-buliding-blocks, auxiliary class PROTAC Linker,Aliphatic Linker, name is (4-Bromobut-1-yn-1-yl)trimethylsilane, and the molecular formula is C7H13BrSi, COA of Formula: C7H13BrSi.

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

Ndikuryayo, Ferdinand published the artcileHydrophobicity-oriented drug design (HODD) of new human 4-hydroxyphenylpyruvate dioxygenase inhibitors, Quality Control of 76283-09-5, the publication is European Journal of Medicinal Chemistry (2019), 22-31, database is CAplus and MEDLINE.

Involved in the tyrosine degradation pathway, 4-hydroxyphenylpyruvate dioxygenase (HPPD) is an important target for treating type I tyrosinemia. To discover novel HPPD inhibitors, we proposed a hydrophobicity-oriented drug design (HODD) strategy based on the interactions between HPPD and the com. drug NTBC. Most of the new compounds showed improved activity, compound d23 being the most active candidate (IC₅₀ = 0.047 μM) with about 2-fold more potent than NTBC (IC₅₀ = 0.085 μM). Therefore, compound d23 is a potential drug candidate to treat type I tyrosinemia.

European Journal of Medicinal Chemistry published new progress about 76283-09-5. 76283-09-5 belongs to bromides-buliding-blocks, auxiliary class Fluoride,Bromide,Benzyl bromide,Benzene, name is 4-Bromo-1-(bromomethyl)-2-fluorobenzene, and the molecular formula is C7H5Br2F, Quality Control of 76283-09-5.

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