Tag: M.W=200-250

Yu, Jen-Kan published the artcileA remarkable ligand orientational effect in osmium-atom-induced blue phosphorescence, Synthetic Route of 219508-27-7, the publication is Chemistry – A European Journal (2004), 10(24), 6255-6264, database is CAplus and MEDLINE.

Os^II-based carbonyl complexes cis(CO),trans(N_py,N_py),cis(N_tz,N_tz)-[Os(CO)₂(bptz)₂] (1), cis(CO),cis(N_py,N_py),trans(N_tz,N_tz)-[Os(bptz)₂(CO)₂] (2), and cis(CO),trans(N_py,N_py),cis(N_tz,N_tz)-[Os(CO)₂(fptz)₂] (3), where bptz and fptz denote 3-tert-butyl-5-(2-pyridyl)- and 3-trifluoromethyl-5-(2-pyridyl)-1,2,4-triazolate, resp., were designed and synthesized in an effort to achieve high efficiency, room-temperature blue phosphorescence. Although 1 and 2 are geometric isomers, remarkably different excited-state relaxation pathways were observed Complex 1 exhibits strong phosphorescence in MeCN (Φ_p ∼ 0.47) and as a single crystal at room temperature, whereas complex 2 is nearly nonemissive under similar conditions. The associated relaxation dynamics were comprehensively studied by spectroscopic and relaxation dynamics as well as by theor. approaches. The authors’ results lead the authors to the conclusion that for complex 2, the loose bolt effect of metal-ligand bonding interactions plays a crucial role in the fast radiationless deactivation of this type of geometrical isomer. Fine adjustment can also be achieved by functionalizing the ligands so that the electron-withdrawing nature of the CF₃ group in 3 stabilizes the HOMO of the triazolate moiety, thus moving the emission further into the pure blue region; this results in highly efficient phosphorescence and renders 3 particularly attractive for application in blue OLED devices.

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 C18H28B2O4, Synthetic Route of 219508-27-7.

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

Kim, Jung-Bum published the artcileHighly efficient deep-blue phosphorescence from heptafluoropropyl-substituted iridium complexes, Related Products of triazoles, the publication is Chemical Communications (Cambridge, United Kingdom) (2015), 51(1), 58-61, database is CAplus and MEDLINE.

New deep-blue iridium cyclometalated difluorophenylpyridine complexes, containing of a heptafluoropropyl (HFP) substituent at the para-position to iridium in the Ph group, [Ir(2-MePy-3,5-F₂-4-R^FC₆H)₂(L₂)] [R^F = C₃F₇, MePy = 4-methyl-2-pyridinyl; L₂ = picolinato, 4-methylpicolinato, 3-(trifluoromethyl)-5-(2-pyridinyl)-1,2,4-triazolato] of 2′,4”-difluorophenyl, have a deep HOMO level and decreased shoulder electronic transition and inhibit self-quenching due to the sterically hindered group without conjugation. An OLED using [(HFP)₂Ir(mpic)] exhibited a maximum EQE of 21.4% with a CIE of (0.146, 0.165).

Chemical Communications (Cambridge, United Kingdom) 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, Related Products of triazoles.

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

Shin, Hyun published the artcileControlling Horizontal Dipole Orientation and Emission Spectrum of Ir Complexes by Chemical Design of Ancillary Ligands for Efficient Deep-Blue Organic Light-Emitting Diodes, Name: 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, the publication is Advanced Materials (Weinheim, Germany) (2019), 31(21), n/a, database is CAplus and MEDLINE.

Deep-blue emitting Iridium (Ir) complexes with horizontally oriented emitting dipoles are newly designed and synthesized through engineering of the ancillary ligand, where 2′,6′-difluoro-4-(trimethylsilyl)-2,3′-bipyridine (dfpysipy) is used as the main ligand. Introduction of a trimethylsilyl group at the pyridine and a nitrogen at the difluoropyrido group increases the bandgap of the emitter, resulting in deep-blue emission. Addition of a Me group (mpic) to a picolinate (pic) ancillary ligand or replacement of an acetate structure of pic with a perfluoromethyl-triazole structure (fptz) increases the horizontal component of the emitting dipoles in sequence of mpic (86%) > fptz (77%) > pic (74%). The organic light-emitting diode (OLED) using the Ir complex with the mpic ancillary ligand shows the highest external quantum efficiency (31.9%) among the reported blue OLEDs with a y-coordinate value lower than 0.2 in the 1931 Commission Internationale de L’Eclairage (CIE) chromaticity diagram.

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 0, 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

Topchiy, Maxim A. published the artcileCyclometallated 1,2,3-triazol-5-ylidene iridium(III) complexes: synthesis, structure, and photoluminescence properties, Safety of 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, the publication is Mendeleev Communications (2019), 29(2), 128-131, database is CAplus.

A series of heteroleptic cyclometallated 1,2,3-triazol-5-ylidene Ir^III complexes were synthesized and structurally characterized. These new complexes demonstrated photoluminescence in green (550 nm) and cyan (499, 496 nm) regions. Their photophys. properties were rationalized using DFT calculations

Mendeleev Communications 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 C18H23N3O4S, Safety 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

Sun, Jing published the artcileSynthesis and photoelectrical properties of self-host blue-green phosphorescent iridium (III) complexes, Computed Properties of 219508-27-7, the publication is Gaodeng Xuexiao Huaxue Xuebao (2015), 36(10), 1859-1864, database is CAplus.

A kind of self-host blue-green phosphorescent Ir(III) complexes [(CzPhBI)₂Ir(tfmptz), (CzPhBI)₂Ir(tfmpptz) and (CzPhBI)₂Ir(fpptz)] was designed and synthesized. CzPhBI, tfmptz, tfmpptz and fpptz were 9-[6-(2-phenyl-1-benzimidazolyl)hexyl]-9-carbazole, 2-(5-trifluoromethyl-1,2,4-triazolyl)pyridine, 2-[5-(4-trifluoromethyl)phenyl-1,2,4-triazolyl]pyridine and 2-[5-(4-fluoro)phenyl-1,2,4-triazolyl]pyridine, resp. The structures were confirmed by NMR (¹H NMR and ¹⁹F NMR) and elemental anal. Photophys. properties were investigated. Electroluminescent performance of Ir(III) complexes were characterized by fabricating the non-doped devices with the configuration of indium tin oxid (ITO) | N,N’-bis-(1-naphthalenyl)-N,N’-bis-phenyl-(1,1′-biphenyl)-4,4′-diamine (NPB) (30 nm) | 4,4′-Bis (9-carbazolyl)-1,1′-biphenyl (CBP) (15 nm) | Ir complexes (30 nm) | 1,3,5-tris (1-phenyl-1H-benzo[d]imidazol-2-yl) benzene (TBPI) (30 nm) | LiF (1 nm) Al (100 nm). The maximum luminance of (CzPhBI)₂Ir(tfmpptz) complexes was 6913 cd/m² and the maximum luminous efficiency achieved 13.9 cd/A.

Gaodeng Xuexiao Huaxue Xuebao 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 C6H5F4NO3S, Computed Properties of 219508-27-7.

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

Krylova, Valentina A. published the artcileStructural and Photophysical Studies of Phosphorescent Three-Coordinate Copper(I) Complexes Supported by an N-Heterocyclic Carbene Ligand, Category: triazoles, the publication is Organometallics (2012), 31(22), 7983-7993, database is CAplus.

A series of four neutral luminescent three-coordinate Cu(I) complexes (IPr)Cu(N-N), where IPr is a monodentate N-heterocyclic carbene (NHC) ligand (IPr = 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) and N-N denotes monoanionic pyridylazolate ligands, have been synthesized and characterized. A monomeric, three-coordinate geometry, best described as distorted trigonal planar, has been established by single-crystal x-ray analyses for three of the derivatives In contrast to the previously reported (IPr)Cu(N-N) complexes, the compounds described here display a perpendicular orientation between the chelating N-N ligands and the imidazolylidene ring of the carbene ligand. The geometrical preferences revealed by x-ray crystallog. correlate well with the NMR data. The conformational behavior of the complexes, investigated by variable-temperature ¹H NMR spectroscopy, indicate free rotation about the C_NHC-Cu bond in solution The complexes display broad, featureless luminescence at both room temperature and 77 K, with emission maxima that vary between 555 and 632 nm depending on sample conditions. Luminescence quantum efficiencies of the complexes in solution (Φ ≤ 17%) increase markedly in the solid state (Φ ≤ 62%). On the basis of time-dependent d. functional theory (TD-DFT) calculations and the exptl. data, luminescence is assigned to phosphorescence from a metal-to-ligand charge-transfer (MLCT) triplet state admixed with ligand-centered (LC) character.

Organometallics 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

Yeh, Yu-Shan published the artcileA new family of homoleptic Ir(III) complexes: Tris-pyridyl azolate derivatives with dual phosphorescence, Application of 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, the publication is ChemPhysChem (2006), 7(11), 2294-2297, database is CAplus and MEDLINE.

The synthesis and characterization of a new family of homoleptic Ir(III) tris(pyridylazolate) complexes, in anticipation of seeing the symmetry restriction on such systems, i.e., showing efficient blue phosphorescence with better color chromaticity is reported. The synthetic scheme, from the isolated intermediate and x-ray analyses, rendered solely meridional structures. The results leads to propose an unusual intra-ligand charge transfer to ligand-to-ligand charge transfer conversion, i.e., an electron transfer like process (vide infra), for which the LLCT lowers the luminous efficiency and results in an unwanted bathochromatic shift.

ChemPhysChem 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 C42H63O3P, 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

Fang, Chung-Hong published the artcileIridium(I) pyridyl azolate complexes with saturated red metal-to-ligand charge transfer phosphorescence; fundamental and potential applications in organic light-emitting diodes, Recommanded Product: 2-[5-(Trifluoromethyl)-1H-1,2,4-triazol-3-yl]pyridine, the publication is Chemistry – A European Journal (2007), 13(9), 2686-2694, database is CAplus and MEDLINE.

Preparation of neutral metal complexes [(cod)Ir(fppz)] (fppz = 3-trifluoromethyl-5-(2-pyrdiyl)pyrazole, 1), [(cod)Ir(bppz)] (bppz = 3-tert-butyl-5-(2-pyridyl)pyrazole, 2), [(cod)Ir(fptz)] (fptz = 3-trifluoromethyl-5-(2-pyridyl)triazolate, 3) and [(cod)Ir(bptz)] (bptz = 3-tert-butyl-5-(2-pyridyl)triazolate, 4), bearing one cod ligand and a pyridyl azolate chelate are reported. A single-crystal x-ray diffraction study of 3 reveals the expected distorted square-planar geometry. The lowest absorption band consists of Ir^I atom increased triplet d_π → π^* transitions (³MLCT), the assignment of which is firmly supported by the theor. approaches. Complexes 1–4 exhibit weak phosphorescence in degassed solution at room temperature, whereas much more intense, solid-state phosphorescence appears in the range 622-649 nm. The pure MLCT emission was used as a prototypical model to address its remarkable spectral differences from the Ir^III isoquinoline pyrrolide complex (5), which has mainly ³ππ phosphorescence. Complex 3 was used as a dopant to fabricate red-emitting phosphorescent organic light-emitting diodes (OLEDs). For the 7% doped device, a maximum brightness of 3010 cd m^-2 was achieved at an applied voltage of 15 V and with CIE coordinates of (0.56, 0.33), demonstrating for the 1st time the potential of neutral Ir^I complexes in OLED applications.

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 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

Chang, Chiung-Fang published the artcileHighly efficient blue-emitting iridium(III) carbene complexes and phosphorescent OLEDs, Synthetic Route of 219508-27-7, the publication is Angewandte Chemie, International Edition (2008), 47(24), 4542-4545, database is CAplus and MEDLINE.

Bright & blue: A strategy for reducing metal-chelate internal strain enables the preparation of blue emitting iridium(III) carbene complexes. The phosphorescent OLED fabricated from one of these complexes shows remarkable CIE coordinates of (0.16, 0.13) and peak efficiencies of 6.0% photons per electron, 6.3 cdA^-1, and 4.0 Im W^-1.

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, Synthetic Route of 219508-27-7.

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

Liao, Jia-Ling published the artcileOs(II) Phosphors with Near-Infrared Emission Induced by Ligand-to-Ligand Charge Transfer Transition, Product Details of C8H5F3N4, the publication is Inorganic Chemistry (2014), 53(17), 9366-9374, database is CAplus and MEDLINE.

Heating of Os₃(CO)₁₂ with 6 equiv of 2-(3-(trifluoromethyl)-1H-1,2,4-triazol-5-yl) pyridine (fptzH) in refluxing diethylene glycol monomethyl ether, followed by sequential treatment with stoichiometric Me₃NO and addition of PPhMe₂, afforded two isomeric mixtures of red-emitting [Os(fptz)₂(PPhMe₂)₂] (1T and 1C), for which the notations T and C stand for the trans and cis-oriented fptz chelates, resp. Alternatively, preparation of Os(II) complex using a 1:1 mixture of 5,5′-di(trifluoromethyl)-3,3′-di-1,2,4-triazole (dttzH₂) and 2,2′-bipyridine (bpy), instead of fptzH, gave isolation of a mononuclear Os(II) complex [Os(bpy)(dttz)(CO)₂] (2) in moderate yield. Replacement of CO with PPhMe₂ on 2 afforded near-IR (NIR)-emitting Os(II) complex [Os(bpy)(dttz)(PPhMe₂)₂] (3). The single-crystal x-ray structural analyses were executed on 1C, 2, and 3 to reveal the structural influence imposed by the various chelates. The photophys. and electrochem. properties were measured and discussed using the results of d. functional theory (DFT) and time-dependent DFT calculations Complex 3 is selected as the dopant to probe its electroluminescent properties by fabrication of the NIR emitting organic light-emitting diodes.

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, Product Details of C8H5F3N4.

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