Tag: M.W=200-250

Song, Yi-Hwa published the artcilePhosphorescent iridium(III) complexes with nonconjugated cyclometalated ligands, Category: triazoles, the publication is Chemistry – A European Journal (2008), 14(18), 5423-5434, database is CAplus and MEDLINE.

Blue phosphorescent Ir(III) complexes 1–4 with nonconjugated N-benzylpyrazole ligands were synthesized and their structural, electrochem., and photophys. properties were studied. Complexes 1–4 exhibit phosphorescence with yields of 5-45% in degassed CH₂Cl₂. Of the compounds, 1 showed emission that was nearly true blue at 460 nm with a lack of vibronic progression. These photophys. data clearly demonstrate that the methylene spacer of the cyclometalated N-benzylpyrazole chelate effectively interrupts the π conjugation upon reacting with a 3rd LX chelating chromophore. This gives a feasible synthesis for the blue phosphorescent complexes with a sufficiently large energy gap. In another approach, these complexes were studied for their suitability for the host material in phosphorescent OLEDs. The device was synthesized by using 1 as the host for the green-emitting [Ir-(ppy)₃] dopant, which exhibits an external quantum conversion efficiency (EQE) of up to 11.4% photons per electron (and 36.6 cdA^-1), with 1931 Commission Internationale de L’Eclairage (CIE) coordinates of (0.30, 0.59), a peak power efficiency of 21.7 lm W^-1, and a maximum brightness of 32000 cdm^-2 at 14.5 V. At the practical brightness of 100 cdm^-2, the efficiency remains >11% and 18 lm W^-1, demonstrating its great potential as the host material for phosphorescent organic light-emitting diodes.

Chemistry – A European Journal 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 C9H17NO, Category: triazoles.

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

Chang, Yu-Fan published the artcileInterface and thickness tuning for blade coated small-molecule organic light-emitting diodes with high power efficiency, HPLC of Formula: 219508-27-7, the publication is Journal of Applied Physics (Melville, NY, United States) (2013), 114(12), 123101/1-123101/15, database is CAplus.

We developed a general method based on fluorescence microscopy to characterize the interface dissolution in multi-layer organic light-emitting diodes (OLEDs) by blade coating. A sharp bi-layer edge was created before blade coating, with the bottom layer being insoluble and top layer soluble After blade coating, fluorescence images showed that the edge of the top layer shifted when the layer dissolved completely, whereas the bottom layer’s edge remained in place as a positioning mark. The dissolution depth was determined to be 15-20 nm when the emissive-layer host of 2,6-bis (3-(9H-carbazol-9-yl)phenyl) pyridine (26DCzPPy) was coated on the hole-transport layer of N,N’-bis(naphthalen-1-yl)-N,N’-bis(phenyl)-benzidine(NPB), which was consistent with a sudden drop in efficiency of orange OLEDs with layer thickness below 20 nm. Thus, the layer thickness of OLEDs was optimized to stay more than 20 nm for blade coating. For a two-color white OLED with the structure TCTA/26DCzPPy:PO-01-TB:FIrpic/TPBI, efficiency was 24 cd/A and 8.5 lm/W at 1000 cd/m². For a three-color white OLED with Os(fptz)₂(dhpm) added as the emitter, the efficiency was 12.3 cd/A and 3.7 lm/W at 1000 cd/m². For a green device with the structure TCTA/26DCzPPy:Ir(mppy)₃/TPBI, the efficiency was 41.9 cd/A and 23.4 lm/W at 1000 cd/m². (c) 2013 American Institute of Physics.

Journal of Applied Physics (Melville, NY, United States) 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

Hwang, Fu-Ming published the artcileIridium(III) Complexes with Orthometalated Quinoxaline Ligands: Subtle Tuning of Emission to the Saturated Red Color, Category: triazoles, the publication is Inorganic Chemistry (2005), 44(5), 1344-1353, database is CAplus and MEDLINE.

Rational design and syntheses of four Ir complexes bearing two substituted quinoxalines and an addnl. 5-(2-pyridyl)pyrazolate or -triazolate as the 3rd coordinating ligand are reported. Single-crystal x-ray diffraction studies of [(dpqx)₂Ir(fppz)] [1; dpqxH = 2,3-diphenylquinoxaline; fppzH = 3-(trifluoromethyl)-5-(2-pyridyl)pyrazole] reveal a distorted octahedral geometry, in which two dpqx ligands adopt an eclipsed configuration, for which the quinoxaline N atoms and the C atoms of orthometalated Ph groups are located at the mutual trans- and cis-positions, resp. The lowest absorption band for all complexes consists of a mixture of heavy-atom Ir(III)-enhanced ³MLCT and ³ππ^* transitions, and the phosphorescent peak wavelength can be fine-tuned to cover the spectral range of 622-649 nm with high quantum efficiencies. The cyclic voltammetry was measured, showing a reversible, metal-centered oxidation with potentials at 0.76-1.03 V, as well as two reversible reduction waves with potentials ranging from -1.61 to -2.06 V, attributed to the sequential addition of two electrons to the more electron-accepting heterocyclic portion of two distinctive cyclometalated CN̂ ligands. Complex 1 was used as a representative example to fabricate red-emitting PLEDs by blending it into a PVK-PBD polymer mixture The devices exhibited the characteristic emission profile of 1 with peak maxima located at 640 nm. The maximum external quantum efficiency was 3.15% ph/el with a brightness of 1751 cd/m² at a c.d. of 67.4 mA/cm², and the maximum brightness of 7750 cd/m² was achieved at the applied voltage of 21 V and with CIE coordinates of (0.64, 0.31).

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, Category: triazoles.

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

Lin, Cheng-Huei published the artcileIridium(III) Complexes of a Dicyclometalated Phosphite Tripod Ligand: Strategy to Achieve Blue Phosphorescence Without Fluorine Substituents and Fabrication of OLEDs, SDS of cas: 219508-27-7, the publication is Angewandte Chemie, International Edition (2011), 50(14), 3182-3186, S3182/1-S3182/20, database is CAplus and MEDLINE.

The authors report a 1-pot synthetic route to obtain new blue phosphors without F substituents. The mols. were assembled using dicyclometalated phosphite (or phosphonite) tripod, coupled with 2-pyridyl triazolate chromophore and a monodentate phosphorous donor. Exploiting one of the products as a paradigm, the outstanding performance includes: peak efficiencies of 11.0% , 22.3 cd A-¹, and 16.7 lm W^-1, together with a turn-on voltage of 4.1 V and blue chromaticity CIE_x,y = 0.179, 0.286 recorded at 100 cd m-2. The terdentate PC̅₂ not only stabilizes the phosphors, its saturated nature also simplifies the color tuning strategy, as evidence by the outstanding performance of another product toward better maximum luminescence and blue chromaticity with slight sacrifice on the peak efficiency. The results thus reveal a great potential of both PC̅₂ and pyridyl azolate chelates in the preparation of blue-emitting phosphors.

Angewandte Chemie, International Edition 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, SDS of cas: 219508-27-7.

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

Chen, Jing-Lin published the artcileSynthesis, Characterization, and Photophysical Properties of Heteroleptic Copper(I) Complexes with Functionalized 3-(2′-Pyridyl)-1,2,4-triazole Chelating Ligands, Computed Properties of 219508-27-7, the publication is Inorganic Chemistry (2013), 52(17), 9727-9740, database is CAplus and MEDLINE.

Mononuclear Cu(I) complexes (1–9) with functionalized 3-(2′-pyridyl)-1,2,4-triazole chelating ligands, as well as the halide and/or phosphine ancillary ligands, were synthesized. Complexes 1–9 were fully characterized by elemental anal., NMR spectroscopy, mass spectroscopy, electronic absorption spectroscopy, fluorescence spectroscopy, cyclic voltammetry, and x-ray crystallog. (1–8). They adopt a distorted tetrahedral configuration, and are considerably air-stable in solid state and in solution All these Cu(I) complexes display a comparatively weak low-energy absorption in CH₂Cl₂ solution, assigned to charge-transfer transitions with appreciable MLCT character, as supported by TD-DFT studies. Cu(I) halide complexes 1–4 each shows bright solid-state emission at room temperature, though they are nonemissive in fluid solutions, in which emission markedly depends on the halide and the substituent on the 2-pyridyl ring. Complexes 5–9 bearing 2-pyridyl functionalized 1,2,4-triazole and phosphine exhibit good photoluminescence properties in solution and solid states at ambient temperature, which are well-modulated via the alteration of the auxiliary phosphine ligand and the structural modification of 3-(2′-pyridyl)-1,2,4-triazole. Cationic complex 6 and neutral derivative 7 can readily be interconverted through the ring inversion of the 1,2,4-triazolyl regulated by the NH ↔ N^– transformation.

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, Computed Properties of 219508-27-7.

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