Tag: M.W=200-250

Feng, Yansong published the artcileRational design and characterization of heteroleptic phosphorescent iridium(III) complexes for highly efficient deep-blue OLEDs, Name: 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2016), 4(43), 10246-10252, database is CAplus.

Two new deep-blue Ir(III) complexes, (dfpypy)₂IrFptz (Ir1) and (Medfpypy)₂IrFptz (Ir2), comprising difluoro-bipyridyl (dfpypy) derivatives as cyclometaling ligands and a chelated pyridyl-triazole (Fptz) ancillary ligand are reported. The bipyridyl ligands lead to a significantly increased HOMO-LUMO gap and a hypsochromic shift of the phosphorescence compared to phenylpyridyl analogs. D. function theory (DFT) calculations and electrochem. measurements for Ir1 and Ir2 support their genuine blue phosphorescent emission. The combination of ancillary and cyclometalating ligands in Ir1 and Ir2 significantly influences the MOs of both complexes, leading to clearly distinct electron d. distributions of the HOMO and LUMO compared with other blue-emitting Ir(III) derivatives Both complexes Ir1 and Ir2 show deep-blue emission with λ_max values at 435-465 nm with high PLQYs and short excited-state lifetimes. The phosphorescent organic light emitting diodes (PhOLEDs) based on Ir1 and Ir2 achieve remarkably high EL performance with low efficiency roll-off at high luminance. The bluest color (CIE_x,y 0.14, 0.11) and the highest EL efficiency were achieved in the device based on Ir2 (Device 2), where the peak EQE/PE of 13.0%/11.2 lm W^-1 together with the corresponding values of 12.6%/8.8 lm W^-1 and 10.1%/5.0 lm W^-1 at the practical luminances of 100 and 1000 cd m^-2, resp., strongly compete with those of any deep-blue fluorescent and/or phosphorescent OLEDs with similar CIE coordinates previously reported.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices published new progress about 219508-27-7. 219508-27-7 belongs to triazoles, auxiliary class Trifluoromethylated Building Blocks, name is 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, and the molecular formula is C8H5F3N4, Name: 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine.

Referemce:
https://en.wikipedia.org/wiki/1,2,3-Triazole,
Triazoles – an overview | ScienceDirect Topics

Ning, Xiaowen published the artcileGreen and yellow pyridazine-based phosphorescent Iridium(III) complexes for high-efficiency and low-cost organic light-emitting diodes, Application of 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, the publication is Dyes and Pigments (2019), 206-212, database is CAplus.

Despite efficient electroluminescence performance, the high fabrication cost due to the utilization of noble metals impedes the commercialization of phosphorescent organic light-emitting diodes (PHOLEDs) based on iridium(III) complexes. In this paper, we designed and synthesized a series of green and yellow phosphorescent iridium(III) complexes with 3-(2,4-difluorophenyl)-6-methylpyridazine as the cyclometalating ligand to fabricate high-performance and low-cost PHOLEDs. By the introduction of a pyridazine moiety to enhance the coordination bond between iridium(III) ion and cyclometalating ligands, these iridium(III) complexes were obtained in high yields and exhibit good thermal stabilities and volatilities, which are beneficial to reduce the device manufacturing cost. Besides, high photoluminescence quantum yields (PLQYs) and short phosphorescent lifetimes of these pyridazine-based iridium(III) complexes endow their PHOLEDs with excellent device performance, which can be promising for practical applications. Particularly, the green emitter (fpdz)₂Irpic exhibited a high PLQY of 0.89 in solid doped thin-film; PHOLED based on (fpdz)₂Irpic achieved an outstanding maximum external quantum efficiency (EQE_max) of 28.7% with ultralow efficiency roll-off of 2% at the high luminance of 1000 cd m^-2, which was superior to the com. green phosphor bis(phenylpyridineyl)iridium(acetylacetonate) [(ppy)₂Ir(acac), EQE_max = 24.2%].

Dyes and Pigments published new progress about 219508-27-7. 219508-27-7 belongs to triazoles, auxiliary class Trifluoromethylated Building Blocks, name is 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, and the molecular formula is C8H5F3N4, Application of 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine.

Referemce:
https://en.wikipedia.org/wiki/1,2,3-Triazole,
Triazoles – an overview | ScienceDirect Topics

Tao, Peng published the artcileHighly efficient blue phosphorescent iridium(III) complexes with various ancillary ligands for partially solution-processed organic light-emitting diodes, Formula: C8H5F3N4, the publication is Journal of Materials Chemistry C: Materials for Optical and Electronic Devices (2017), 5(36), 9306-9314, database is CAplus.

One homoleptic facial and five novel highly efficient blue heteroleptic iridium(III) complexes were designed and synthesized by selecting 2-(4-fluoro-3-(trifluoromethyl)phenyl)pyridine as cyclometalated ligands and 2,4-pentanedione, 2-(3-(trifluoromethyl)-1H-1,2,4-triazol-5-yl)pyridine, picolinic acid, 2-(1H-imidazol-2-yl)pyridine and 2-(1H-tetrazol-5-yl)pyridine as ancillary ligands, resp. The alternation of ancillary ligands could finely tune the photophys. properties of the phenylpyridine-based complexes, particularly with respect to emission wavelength, photoluminescence quantum yield (Φ_PL), full width at half maximum (FWHM), etc. The phosphors designed not only exhibit excellent solubility in commonly used solvents with robust chem. stability but also show bright emissions in the pure blue region with very high absolute Φ_PL up to 0.98 in solution and relatively narrow FWHMs up to 52 nm. Furthermore, based on these highly efficient blue phosphors, high-performance partially solution-processed blue organic light-emitting diodes have been successfully fabricated. The electroluminescence peak, 1931 Commission Internationale de L’Eclairage coordinate and FWHM of the device based on Ir4 are all superior to the device based on FIrpic. In addition, the maximum efficiencies of the device based on Ir4 (21.15 cd A^-1, 12.07 lm W^-1) are also higher than those of the device based on FIrpic (18.89 cd A^-1, 11.26 lm W^-1) under the same conditions.

Journal of Materials Chemistry C: Materials for Optical and Electronic Devices published new progress about 219508-27-7. 219508-27-7 belongs to triazoles, auxiliary class Trifluoromethylated Building Blocks, name is 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, and the molecular formula is C13H19Br2ClN2O, Formula: C8H5F3N4.

Referemce:
https://en.wikipedia.org/wiki/1,2,3-Triazole,
Triazoles – an overview | ScienceDirect Topics

Chen, Jing-Lin published the artcileHeterobimetallic copper(I) complexes bearing both 1,1′-bis(diphenylphosphino)ferrocene and functionalized 3-(2′-pyridyl)-1,2,4-triazole, Recommanded Product: 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, the publication is New Journal of Chemistry (2019), 43(10), 4261-4271, database is CAplus.

Cationic and neutral heterobimetallic Cu(I) complexes bearing both 1,1′-bis(diphenylphosphino)ferrocene and functional 3-(2′-pyridyl)-1,2,4-triazole were synthesized. They all show a highly distorted tetrahedral P₂N₂ geometry around Cu(I), in which functional 3-(2′-pyridyl)-1,2,4-triazole adopts either mono-anionic η²(N1,N2) or neutral η²(N1,N2) or η²(N1,N4) bonding mode, depending on the substituent and NH ⇄ N^– conversion of 1,2,4-triazole. All these Cu(I) complexes are air-stable in both solution and solid states, and isomerization is only observed in solution for the cationic complex with a bulky tert-Bu group, as evidenced by ¹H and ³¹P NMR studies. All these 1,2,4-triazole-based complexes show a relatively weak and broadened low-energy absorption band, attributed to the charge-transfer transitions, as suggested by time-dependent d. functional theory (TDDFT) calculations, which is more influenced by the NH ⇄ N^– conversion of 1,2,4-triazole relative to the variation of their substituents. Since the charge-transfer excited state is quenched by a photoinduced intramol. energy transfer from the {Cu(NÑ)(PP)} moiety to the ferrocene, as supported by the lowered oxidation potential of the ferrocene in comparison to the Cu(I) center, these dppf-based Cu(I) complexes all show no detectable emission in solution and solid states at room temperature and at 77 K.

New Journal of Chemistry published new progress about 219508-27-7. 219508-27-7 belongs to triazoles, auxiliary class Trifluoromethylated Building Blocks, name is 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, and the molecular formula is C8H5F3N4, Recommanded Product: 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine.

Referemce:
https://en.wikipedia.org/wiki/1,2,3-Triazole,
Triazoles – an overview | ScienceDirect Topics

Song, Yi-Hwa published the artcileBright and efficient, non-doped, phosphorescent organic red-light-emitting diodes, Application of 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, the publication is Advanced Functional Materials (2004), 14(12), 1221-1226, database is CAplus.

Ir^(III) metal complexes [(nazo)₂Ir(Fppz)] (1), [(nazo)₂Ir(Bppz)] (2), and [(nazo)₂Ir(Fptz)] (3) [(nazo)H = 4-Ph quinazoline, (Fppz)H = 3-trifluoromethyl-5-(2-pyridyl) pyrazole, (Bppz)H = 3-t-butyl-5-(2-pyridyl) pyrazole, and (Fptz)H = 3-trifluoromethyl-5-(2-pyridyl) triazole] were synthesized, among which the exact configuration of 1 was confirmed using single-crystal x-ray diffraction anal. These complexes exhibited bright red phosphorescence with relatively short lifetimes of 0.4-1.05 μs in both solution and the solid-state at room temperature Nondoped organic light-emitting diodes (OLEDs) were fabricated using complexes 1 and 2 in the absence of a host matrix. Saturated red electroluminescence was observed at λ_max = 626 nm (host-emitter complex 1) and 652 nm (host-emitter complex 2), which corresponds to coordinates (0.66,0.34) and (0.69,0.31), resp., on the 1931 Commission Internationale de l’Eclairage (CIE) chromaticity diagram. The nondoped devices employing complex 1 showed electroluminance ≤5780 cd m^-2, an external quantum efficiency of 5.5% at 8 V, and a c.d. of 20 mA cm^-2. The short phosphorescence lifetime of 1 in the solid state, coupled with its modest π-π stacking interactions, appear to be the determining factors for its unusual success as a nondoped host-emitter.

Advanced Functional Materials published new progress about 219508-27-7. 219508-27-7 belongs to triazoles, auxiliary class Trifluoromethylated Building Blocks, name is 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, and the molecular formula is Al2H32O28S3, Application of 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine.

Referemce:
https://en.wikipedia.org/wiki/1,2,3-Triazole,
Triazoles – an overview | ScienceDirect Topics

Yeh, Shi-Jay published the artcileNew dopant and host materials for blue-light-emitting phosphorescent organic electroluminescent devices, Synthetic Route of 219508-27-7, the publication is Advanced Materials (Weinheim, Germany) (2005), 17(3), 285-289, database is CAplus.

Efficient organic light-emitting diodes (OLEDs) incorporating Ir^III bis(4,6-difluorophenylpyridinato)-3-(trifluoromethyl)-5-(pyridin-2-yl)-1,2,4-triazolate (FIrtaz) and Ir^III bis(4,6-difluorophenylpyridinato)-5-(pyridin-2-yl)-1H-tetrazolate (FIrN4) demonstrate higher-purity blue-light emission than the long-known Ir^III bis(4,6-difluorophenylpyridinato)-picolate (FIrpic) phosphorophor. New host materials with higher glass-transition temperatures also enhance the OLED performance.

Advanced Materials (Weinheim, Germany) published new progress about 219508-27-7. 219508-27-7 belongs to triazoles, auxiliary class Trifluoromethylated Building Blocks, name is 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, and the molecular formula is C3H5F3O, Synthetic Route of 219508-27-7.

Referemce:
https://en.wikipedia.org/wiki/1,2,3-Triazole,
Triazoles – an overview | ScienceDirect Topics

Davies, Thomas G. published the artcileMonoacidic Inhibitors of the Kelch-like ECH-Associated Protein 1: Nuclear Factor Erythroid 2-Related Factor 2 (KEAP1:NRF2) Protein-Protein Interaction with High Cell Potency Identified by Fragment-Based Discovery, COA of Formula: C8H8BrN3O, the publication is Journal of Medicinal Chemistry (2016), 59(8), 3991-4006, database is CAplus and MEDLINE.

KEAP1 is the key regulator of the NRF2-mediated cytoprotective response, and increasingly recognized as a target for diseases involving oxidative stress. Pharmacol. intervention has focused on mols. that decrease NRF2-ubiquitination through covalent modification of KEAP1 cysteine residues, but such electrophilic compounds lack selectivity and may be associated with off-target toxicity. We report here the first use of a fragment-based approach to directly target the KEAP1 Kelch-NRF2 interaction. X-ray crystallog. screening identified three distinct “hot-spots” for fragment binding within the NRF2 binding pocket of KEAP1, allowing progression of a weak fragment hit to mols. with nanomolar affinity for KEAP1 while maintaining drug-like properties. This work resulted in a promising lead compound (I) which exhibits tight and selective binding to KEAP1, and activates the NRF2 antioxidant response in cellular and in vivo models, thereby providing a high quality chem. probe to explore the therapeutic potential of disrupting the KEAP1-NRF2 interaction.

Journal of Medicinal Chemistry published new progress about 1799973-82-2. 1799973-82-2 belongs to triazoles, auxiliary class Other Aromatic Heterocyclic,Bromide,Ether, name is 5-Bromo-7-methoxy-1-methyl-1H-benzo[d][1,2,3]triazole, and the molecular formula is C8H8BrN3O, COA of Formula: C8H8BrN3O.

Referemce:
https://en.wikipedia.org/wiki/1,2,3-Triazole,
Triazoles – an overview | ScienceDirect Topics

Wang, Sheng-Wei published the artcileEngineering of thiocyanate-free Ru(II) sensitizers for high efficiency dye-sensitized solar cells, Recommanded Product: 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, the publication is Chemical Science (2013), 4(6), 2423-2433, database is CAplus.

We synthesized a series of Ru(ii) metal complexes TFRS-1, -2, -4, -21, -22 and -24 with a single 4,4′-dicarboxylic acid-2,2′-bipyridine together with two functionalized pyridyl azolate ancillary ligands consisting of pyrazolate or triazolate groups. Both photophys. measurements and DFT/TDDFT calculations were conducted to gain insight into their electronic and optical properties. The triazolate series of sensitizers TFRS-21, -22 and -24 showed an enlarged optical band gap with respect to their pyrazolate counterparts TFRS-1, -2 and -4. When employed in dye sensitized solar cells (DSCs), the triazolate sensitizers show slightly inferior J_SC values due to the poor incident photon-to-current conversion efficiencies recorded compared to the pyrazolate series. Moreover, the endowed 5-(hexylthio)thiophen-2-yl substituents exert a notable hyperchromic effect and bathochromic shift in the absorption spectra, which then improves the short circuit current J_SC to 18.7 and 15.5 mA cm^-2 and the overall conversion efficiency to η = 10.2% and 8.25% for TFRS-4 and TFRS-24, resp. For the evaluation of V_OC, transient photocurrent and photovoltage decay measurements were carried out to compare the rates of interfacial recombination of electrons from the TiO₂ conduction band to electrolyte.

Chemical Science published new progress about 219508-27-7. 219508-27-7 belongs to triazoles, auxiliary class Trifluoromethylated Building Blocks, name is 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, and the molecular formula is C6H8O4, Recommanded Product: 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine.

Referemce:
https://en.wikipedia.org/wiki/1,2,3-Triazole,
Triazoles – an overview | ScienceDirect Topics

Li, Xiao-Na published the artcileInjection, Transport, Absorption and Phosphorescence Properties of a Series of Blue-Emitting Ir(III) Emitters in OLEDs: a DFT and Time-Dependent DFT Study, Recommanded Product: 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, the publication is Inorganic Chemistry (2009), 48(16), 7740-7749, database is CAplus and MEDLINE.

Quantum-chem. methods were explored to study the electronic structures, injection and transport properties, absorption and phosphorescence mechanism of blue-emitting Ir(III) complexes {[(F₂-ppy)₂Ir(pta -X/pyN4)], where F₂-ppy = (2,4-difluoro)phenylpyridine; pta = pyridine-1,2,4-triazole; X = phenyl(1); p-tolyl (2); 2,6-difluororophenyl (3); -CF₃ (4), and pyN4 = pyridine-1,2,4-tetrazolate (5)}, which were used as emitters in organic light-emitting diodes (OLEDs). The mobility of hole and electron were studied computationally based on the Marcus theory. Calculations of Ionization potentials (IPs) and electron affinities (EAs) were used to evaluate the injection abilities of holes and electrons into these complexes. The reasons for the lower EL efficiency and phosphorescence quantum yields in 3-5 than in 1 and 2 were studied. These new structure-property relations can guide an improved design and optimization of OLED devices based on blue-emitting phosphorescent Ir(III) complexes.

Inorganic Chemistry published new progress about 219508-27-7. 219508-27-7 belongs to triazoles, auxiliary class Trifluoromethylated Building Blocks, name is 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, and the molecular formula is C8H5F3N4, Recommanded Product: 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine.

Referemce:
https://en.wikipedia.org/wiki/1,2,3-Triazole,
Triazoles – an overview | ScienceDirect Topics

Hu, Yong-Xu published the artcileNovel Ir(III) complexes ligated with 2-(2,6-difluoropyridin-3-yl)benzo[d]thiazole for highly efficient OLEDs with mild efficiency roll-off, HPLC of Formula: 219508-27-7, the publication is Dyes and Pigments (2019), 254-259, database is CAplus.

2-Phenylbenzothiazole-based Ir(III) complex [(bt)₂Ir(acac)] is a class of typical yellow phosphorescence material, which has been widely used in OLEDs. However, (bt)₂Ir(acac) exhibited only mild photoluminescence quantum efficiency (PLQY) of 0.26-0.28. To further improve the luminous efficiency of benzothiazole-based Ir(III) complex and then boost the corresponding electroluminescent performance, (fpbt)₂Ir(pic) and (fpbt)₂Ir(tftp) were successfully synthesized, where 2-(2,6-difluoropyridin-3-yl)benzo[d]thiazole (fpbt) was applied as C∩N main ligand, and 2-pyridine carboxylic acid (pic), 2-(3-(trifluoromethyl)-1H-1,2,4-triazol-5-yl)pyridine (tftp) acted as different auxiliary ligands. Both (fpbt)₂Ir(pic) and (fpbt)₂Ir(tftp) presented excellent PLQYs (0.93-0.95) and high thermostability (330-360 °C). The vacuum-deposited devices following the architecture of ITO/TAPC/CBP: dopant/TPBi/Liq/Al demonstrated prominent performances. Of them, (fpbt)₂Ir(pic)-doped OLEDs exhibited better efficiencies of 20.6%, 68.8 cd A^-1, and 40.8 l m W^-1 while maintaining very mild efficiency roll-off. Such outstanding electrophosphorescent performances were further investigated, which was probably attributed to the following factors: (1) high PLQY; (2) good electron mobility; (3) uniform film-forming property.

Dyes and Pigments published new progress about 219508-27-7. 219508-27-7 belongs to triazoles, auxiliary class Trifluoromethylated Building Blocks, name is 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, and the molecular formula is C8H5F3N4, HPLC of Formula: 219508-27-7.

Referemce:
https://en.wikipedia.org/wiki/1,2,3-Triazole,
Triazoles – an overview | ScienceDirect Topics