76591-83-8

Upstream product

• 76226-63-6 4-(p-bromo-α-methylthiobenzylidene)morpholinium iodide 
• 1005-02-3 2-pyridinecarbohydrazonamide 
• 146429-95-0 N¹-(4-bromobenzyliden)-2-pyridincarboxyamidrazone 
• 1005-02-3 pyridine-2-carboxamidrazone 
• 1122-91-4 4-bromo-benzaldehyde 
• 100-70-9 2-Cyanopyridine 
• 5933-32-4 4-bromobenzoic acid hydrazide 
• 1452-63-7 picolinic acid hydrazide 
• 26040-83-5 methyl 4-bromobenzimidate 
• 1005-02-3 picolinamidrazone 
• 586-75-4 4-chlorobenzoyl chloride 

Downstream Products

• 1385719-77-6 2-(3-(4-(pyridin-4-yl)phenyl)-1H-1,2,4-triazol-5-yl)pyridine 
• 1037549-39-5 Ir(C₆H₄C₅H₄N)2(C₅H₄NC₂N₃C₆H₄Br) 

Relevant academic research and scientific papers

Bipolar hosts and non-doped deep-blue emitters (CIE: Y = 0.04) based on phenylcarbazole and 2-(2-phenyl-2 H -1,2,4-triazol-3-yl)pyridine groups

We have designed and synthesized four bipolar materials, TAZ-1Cz, TAZ-2Cz, TAZ-3Cz and TAZ-4Cz, using 2-(2-phenyl-2H-1,2,4-triazol-3-yl)pyridine (TAZ) as an electron-withdrawing group and phenylcarbazole as an electron-donating group. Their rigid molecular structures improve their thermal stability with high glass transition temperatures: 99 °C for TAZ-2Cz, 100 °C for TAZ-3Cz and 103 °C for TAZ-4Cz. Employing TAZ-1Cz, TAZ-2Cz, TAZ-3Cz and TAZ-4Cz as hosts, green phosphorescent organic light-emitting devices (PhOLEDs) with fac-tris(2-phenylpyridine)iridium as an emitter display maximum external quantum efficiencies (EQEs) of 15.8, 15.5, 16.0 and 13.0%, respectively. And blue PhOLEDs hosted by TAZ-1Cz, TAZ-2Cz and TAZ-3Cz achieved maximum current efficiencies of 8.6, 11.0 and 10.6 cd A-1, respectively. Furthermore, non-doped OLEDs using TAZ-1Cz and TAZ-4Cz as emitters exhibit electroluminescence (EL) peaks at 400 and 412 nm with CIE coordinates of (0.16, 0.04) and (0.15, 0.04), which are located in the deep-blue region.

1,2,4-triazole derivative-based dark blue fluorescent material and preparation method thereof

The invention discloses a 1,2,4-triazole derivative-based dark blue fluorescent material which is as shown in the structural general formula (I). A 1,2,4-triazole derivative is used as a receptor unit, and phenylcarbazole or triphenylamine is used as a donor unit, thus forming the dark blue fluorescent material through conjugated benzene ring connection. The structural characteristic of the fluorescent material is favorable for forming a charge transfer excited state in a molecule, increasing the radiation excitor utilization rate and breaking through the limit that the excitor utilization rate of the fluorescent material is 25 percent to obtain the dark blue fluorescent material. The chromaticity coordinate of an OLED device prepared from the fluorescent material is less than that of standard blue light.

1,2,4-Triazole acceptor-based thermally activated delayed fluorescence material

The invention discloses a 1,2,4-riazole acceptor-based thermally activated delayed fluorescence material with the structure represented by general formula (I) and capable of realizing dark blue lights. The material is formed through connecting the para-position of 3-substituted phenyl group of a 1,2,4-triazole derivative used as an acceptor unit with an N-containing donor unit. The thermally activated delayed fluorescence material has small singlet-triplet energy level difference, can meet requirements of the thermally activated delayed fluorescence material, allows a dark blue fluorescence material to be obtained, and improves the luminous efficiency of TADF type OLED devices.

Bipolar blue phosphorescent host material based on carbazole and 1,2,4-triazole

The invention discloses a bipolar blue phosphorescent host material which is as shown in a structural general formula (I) and takes carbazole and 1,2,4-triazole as a donor and a receptor respectively. The triplet-state energy level of the host material is

A novel high-efficiency white hyperbranched polymer derived from polyfluorene with green and red iridium(III) complexes as the cores

A new kind of single triple-color hyperbranched polymer PF-Ir(ppy)2(pytzph)m-Ir(piq)2(pytzph)n was designed and synthesized, in which green and red iridium(III) complexes acted as cores and blue polyfluorene acted as backbone. PF-Ir(ppy)2(pytzph)m-Ir(piq)2(pytzph)n (m = 5, n = 5 and m = 25, n = 5) had higher quantum efficiency than PF-Ir(piq)2(pytzph)5. The energy transfer from green core bis(2-phenylpyridine)[3-(2-pyridyl)-5-phenyl-1,2,4-triazole]iridium(III) [Ir(ppy)2(pytzph)] with high triplet energy level (ET = 2.58 eV) to red core bis(1-phenylisoquinolinato)[3-(2-pyridyl)-5-phenyl-1,2,4-triazole]iridium(III) [Ir(piq)2(pytzph)] (ET = 2.12 eV) could realize by intermediate poly(9,9-dioctylfluorene) (PF) segments. A typical single emitting-layer device with the configuration of ITO/PEDOT:PSS (40 nm)/PF-Ir(ppy)2(pytzph)m-Ir(piq)2(pytzph)n (80 nm)/TPBi (40 nm)/LiF (0.8 nm)/Al (100 nm) was fabricated. Among the white polymers, PF-Ir(ppy)2(pytzph)5-Ir(piq)2(pytzph)5 exhibited excellent electroluminescent properties with a Commission Internationale Ed I'eclairage (CIE) coordinate of (0.32, 0.34) and a maximum luminous efficiency of 11.49 cd/A.

Blue-light-emitting iridium complex, iridium complex monomer, phosphorus polymer, and organic electroluminescence device using same

Provided are a blue-light-emitting iridium complex, an iridium complex monomer, a phosphorescent polymer, and an organic electroluminescent device using same. The blue-light-emitting iridium complex contains a ligand having a low electron density structure, such as triazole or tetrazole. The iridium complex monomer containing a ligand having a polymerizable vinyl group produces a blue phosphorescent polymer through the polymerization with carbazole derivatives. The organic electroluminescent device comprises a first electrode, a second electrode, and a light-emitting layer interposed between the first electrode and the second electrode, wherein the light-emitting layer contains the above-described iridium complex or polymer containing the iridium complex.

Synthesis of 5-aryl-3-C-glycosyl- and unsymmetrical 3,5-diaryl-1,2,4-triazoles from alkylidene-amidrazones

Among 1,2,4-triazole derivatives with versatile biological activities 3-C-glucopyranosyl-5-substituted-1,2,4-triazoles belong to the most efficient inhibitors of glycogen phosphorylase, and are thus potential antidiabetic agents. In seeking new synthetic methods for this class of compounds oxidative ring closures of N1-alkylidene carboxamidrazones were studied. O-Peracylated N1-(β-d-glycopyranosylmethylidene)-arenecarboxamidrazones were prepared from the corresponding glycosyl cyanides and amidrazones by Raney-Ni reduction in the presence of NaH2PO2. Bromination of the so obtained compounds by NBS gave hydrazonoyl bromide type derivatives which were ring closed to 3-C-glycosyl-5-substituted-1,2,4-triazoles in pyridine or by NH4OAc in AcOH. Under the same conditions O-perbenzoylated N1-arylidene-C-(β-d-glucopyranosyl)-formamidrazones gave the expected 1,2,4-triazoles as minor products only. N1-Arylidene-arenecarboxamidrazones were also transformed into 3,5-diaryl-1,2,4-triazoles with NBS/NH4OAc in AcOH indicating high functional group tolerance and general applicability of the method.

Unusual high thermal stablility of a 2D → 3D polycatenated Fe(II) metal-organic framework showing guest-dependent spin-crossover behavior and high spin-transition temperature

A novel three-dimensional (3D) Fe(II) metal-organic framework (MOF), [Fe2(pptp)42H2O]n (1), constructed from the rigid 2-(3-(4-(pyridin-4-yl)phenyl)-1H-1,2,4-triazol-5-yl)pyridine (Hpptp) ligand was synthesized