Category: 219508-27-7

Yang, Cheng-Han published the artcileHeteroleptic Cyclometalated Iridium(III) Complexes Displaying Blue Phosphorescence in Solution and Solid State at Room Temperature, SDS of cas: 219508-27-7, the publication is Inorganic Chemistry (2005), 44(22), 7770-7780, database is CAplus and MEDLINE.

A series of heteroleptic Ir(III) metal complexes 1–3 bearing two N-phenyl-substituted pyrazoles and one 2-pyridyl pyrazole (or triazole) ligands were synthesized and characterized to attain highly efficient, room-temperature blue phosphorescence. The N-phenylpyrazole ligands, dfpzH = 1-(2,4-difluorophenyl)pyrazole, fpzH = 1-(4-fluorophenyl)pyrazole, dfmpzH = 1-(2,4-difluorophenyl)-3,5-dimethylpyrazole, and fmpzH = 1-(4-fluorophenyl)-3,5-dimethylpyrazole, show a similar reaction pattern with respect to the typical cyclometalated (C-N) chelate, which utilizes its ortho-substituted Ph segment to link with the central Ir(III) atom, while the second 2-pyridylpyrazole (or triazole) ligand, namely, fppzH = 3-(trifluoromethyl)-5-(2-pyridyl)pyrazole, fptzH = 3-(trifluoromethyl)-5-(2-pyridyl)triazole, and hptzH = 3-(heptafluoropropyl)-5-(2-pyridyl)triazole, undergoes typical anionic (N-N) chelation to complete the octahedral framework. X-ray structural analyses on complexes [(dfpz)₂Ir(fppz)] (1a) and [(fmpz)₂Ir(hptz)] (3d) were established to confirm their mol. structures. Increases of the ππ^* energy gaps of the Ir(III) metal complexes were systematically achieved with two tuning strategies. One involves the substitution for one or two fluorine atoms at the N-Ph segment or the introduction of two electron-releasing Me substituents at the pyrazole segment of the H(C-N) ligands. Alternatively, we have applied the more electron-accepting triazolate in place of the pyrazolate segment for the third (N-N)H ligand. Our results, on the basis of steady-state, relaxation dynamics, and theor. approaches, lead to a conclusion that, for complexes 1–3, the weakening of iridium metal-ligand bonding strength in the T₁ state plays a crucial role for the fast radiationless deactivation. For the case of [(fmpz)₂Ir(hptz)] (3d), a thermal deactivation barrier of 4.8 kcal/mol was further deduced via temperature-dependent studies. The results provide a theor. basis for future design and synthesis of the corresponding analogs suited to blue phosphorescent emitters.

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 C8H6ClNO, SDS of cas: 219508-27-7.

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

Tung, Yung-Liang published the artcileOrganic light-emitting diodes based on charge-neutral Os(II) emitters: generation of saturated red emission with very high external quantum efficiency, Category: triazoles, the publication is Journal of Materials Chemistry (2005), 15(4), 460-464, database is CAplus.

The authors report the syntheses of three sublimable charge neutral Os(II) triazolate complexes. Red-emitting organic electroluminescent devices employing one of the materials, either as a dopant in a 4,4′-N,N‘-dicarbazolyl-1,1′-biphenyl or as a neat film, were constructed and evaluated. Changing the hole-transport layer in the devices from 4,4’-bis[N-(1-naphthyl)-N-phenylamino]biphenyl NPB to 9,9-bis(4-di(p-biphenyl)aminophenyl)fluorene (BPAPF) was observed to produce an increase in quantum efficiency, attributed to the higher hole mobility of BPAPF.

Journal of Materials 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 C20H21ClN4O4, Category: triazoles.

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