Tag: 100-200

《Chlorinated yellow phosphorescent cyclometalated neutral iridophosphors featuring broad emission bandwidths for white electroluminescence》 was written by Tao, Peng; Zheng, Xiao-Kang; Wei, Xiao-Zhen; Lau, Mei-Tung; Lee, Yuk-Ki; Li, Zi-Kang; Guo, Ze-Ling; Zhao, Fang-Qing; Liu, Xing; Liu, Shu-Juan; Zhao, Qiang; Miao, Yan-Qin; Wong, Wai-Yeung. Recommanded Product: 98-98-6This research focused onyellow phosphorescent cyclometalated neutral iridophosphor electroluminescence broad emission bandwidth. The article conveys some information:

The efficient yellow phosphors with broad emission bandwidths play quite important roles in the realization of high-performance two-color white organic light-emitting devices (OLEDs). Herein, by using a chlorine-functionalization method, we designed three efficient yellow iridium(III) complexes (Ir1-Ir3) bearing chlorine atoms. At room temperature, these phosphors exhibit bright yellow phosphorescence with emission wavelengths of 549-574 nm and high photoluminescence efficiency of 0.49-0.73 in the N2-saturated dichloromethane. Importantly, these complexes feature extremely broad emission bandwidths (reaching 104 nm), making them the record-high values in the yellow iridium(III) phosphors reported so far. Using these complexes as the triplet dopants, the prepared OLEDs show yellow phosphorescence with the emission maximum at 565, 548, and 551 nm, resp. The extremely high external quantum efficiency of 23.8% was realized for the as-prepared yellow OLEDs. Furthermore, Ir2-based two-color white OLED with high spectral quality was also realized, and the color rendering index and CIE coordinates for two-color white OLED are 74 and (0.32, 0.34), resp. The broad yellow emission band and high-efficiency of the device proved that these phosphors show great potentials in developing high-performance yellow and white electroluminescence.Picolinic acid(cas: 98-98-6Recommanded Product: 98-98-6) was used in this study.

Picolinic acid(cas: 98-98-6) is used as a chelate for alkaline earth metals. Used to prepare picolinato ligated transition metal complexes. In synthetic organic chemistry, has been used as a substrate in the Mitsunobu reaction and in the Hammick reaction.Recommanded Product: 98-98-6

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Accelerating proton-coupled electron transfer of metal hydrides in catalyst model reactions》 was written by Liu, Tianfei; Guo, Meiyuan; Orthaber, Andreas; Lomoth, Reiner; Lundberg, Marcus; Ott, Sascha; Hammarstroem, Leif. Product Details of 62734-08-1 And the article was included in Nature Chemistry on August 31 ,2018. The article conveys some information:

Metal hydrides are key intermediates in catalytic proton reduction and dihydrogen oxidation There is currently much interest in appending proton relays near the metal center to accelerate catalysis by proton-coupled electron transfer (PCET). However, the elementary PCET steps and the role of the proton relays are still poorly understood, and direct kinetic studies of these processes are scarce. Here, authors report a series of tungsten hydride complexes as proxy catalysts, with covalently attached pyridyl groups as proton acceptors. The rate of their PCET reaction with external oxidants is increased by several orders of magnitude compared to that of the analogous systems with external pyridine on account of facilitated proton transfer. Moreover, the mechanism of the PCET reaction is altered by the appended bases. A unique feature is that the reaction can be tuned to follow three distinct PCET mechanisms-electron-first, proton-first or a concerted reaction-with very different sensitivities to oxidant and base strength. Such knowledge is crucial for rational improvements of solar fuel catalysts. In addition to this study using 2-(Chloromethyl)-4-methoxypyridine hydrochloride, there are many other studies that have used 2-(Chloromethyl)-4-methoxypyridine hydrochloride(cas: 62734-08-1Product Details of 62734-08-1) was used in this study.

2-(Chloromethyl)-4-methoxypyridine hydrochloride(cas: 62734-08-1) belongs to pyridine. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. Additionally, pyridine-based natural products continue to be discovered and studied for their properties and to understand their biosynthesis.Product Details of 62734-08-1

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Name: 5-Bromo-2-chloropyridineIn 2017 ,《Sequential one pot double C-H heteroarylation of thiophene using bromopyridines to synthesize unsymmetrical 2,5-bipyridylthiophenes》 was published in Tetrahedron. The article was written by Kieffer, Charline; Babin, Victor; Jouanne, Marie; Slimani, Ikram; Berhault, Yohann; Legay, Remi; Sopkova-de Oliveira Santos, Jana; Rault, Sylvain; Voisin-Chiret, Anne Sophie. The article contains the following contents:

We present C-H heteroarylation reactions between thiophene and variously substituted bromopyridines. The objective was to synthesize unsym. 2,5-bipyridylthiophenes. We studied the reaction conditions allowing to a sequential one-pot double C-H heteroarylation, in a view to introduce two different pyridyl moieties at positions 2 and 5 of the thiophene ring using bromopyridines. 11 original unsym. 2,5-bipyridylthiophenes were synthesized and characterized, including 2,5-di(pyridin-2-yl)thiophenes for which the preparation by classical cross-coupling reactions is challenging. Finally, with the addnl. synthesis of both an unsym. 2,5-biarylthiophene and an original pyrimidin-thiophene-furan scaffold, we shown that our methodol. was also an efficient tool to access to new heterocyclic sequences. In the part of experimental materials, we found many familiar compounds, such as 5-Bromo-2-chloropyridine(cas: 53939-30-3Name: 5-Bromo-2-chloropyridine)

5-Bromo-2-chloropyridine(cas: 53939-30-3) belongs to pyridine. Pyridines, quinolines, and isoquinolines have found a function in almost all aspects of organic chemistry. Pyridine has found use as a solvent, base, ligand, functional group, and molecular scaffold. As structural elements, these moieties are potent electron-deficient groups, metal-directing functionalities, fluorophores, and medicinally important pharmacophores. Name: 5-Bromo-2-chloropyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

COA of Formula: C6H4N2In 2020 ,《A luminescent zinc(II) coordination polymer as a highly selective and sensitive chemosensor for Fe(III) cation and Cr(VI) anions detection in aqueous solution》 appeared in Inorganica Chimica Acta. The author of the article were Li, Ling; Deng, Zhao-Yang; Xie, Xin; Zou, Ji-Yong; You, Sheng-Yong; Chen, Kai-Hong; Le, Jin-Feng. The article conveys some information:

A double-bent-mixed-ligand supported 2-periodic coordination polymer (CP) {[Zn2(FDA)2(4-abpt)2(H2O)2]}n (1) was synthesized from the unique combination of a bent furan-2,5-dicarboxylic acid (H2FDA) ligand and a bent 4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole (4-abpt) coligand. The CP 1 demonstrates readily dispersible two-dimensional (2D) 2-periodic layer structure and considerable chemostability in aqueous media. Luminescence titration experiments indicate that CP 1 can serve as chemosensors for sensitively and selectively detecting Fe3+ cation, CrO42- and Cr2O72- anions in water solution via an environmentally friendly manner. Besides, the luminescent selective quenching mechanism of CP 1 toward Fe3+ cation, CrO42- and Cr2O72- anions is comprehensively studied in the light of absorption of the excitation energy of the host framework by individual analytes. In addition to this study using 4-Cyanopyridine, there are many other studies that have used 4-Cyanopyridine(cas: 100-48-1COA of Formula: C6H4N2) was used in this study.

4-Cyanopyridine(cas: 100-48-1) belongs to pyridine. The basicity and metallophilic high donor number of these π-deficient systems has long favored them as ligands in metal catalysis. The last decade saw pyridine assume a stronger role as functional group for directed C–H oxidation/activation.COA of Formula: C6H4N2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Quality Control of Bis(pyridin-2-ylmethyl)amineIn 2019 ,《Two telomerase-targeting Pt(II) complexes of jatrorrhizine and berberine derivatives induce apoptosis in human bladder tumor cells》 appeared in Dalton Transactions. The author of the article were Qin, Qi-Pin; Wang, Zhen-Feng; Huang, Xiao-Ling; Tan, Ming-Xiong; Luo, Zhi-Hui; Wang, Shu-Long; Zou, Bi-Qun; Liang, Hong. The article conveys some information:

Two novel Pt(IIi) complexes, [Pt(B-TFA)Cl]Cl (Pt1) and [Pt(J-TFA)Cl]Cl (Pt2) with jatrorrhizine and berberine derivatives (B-TFA and J-TFA) were first prepared as desirable luminescent agents for cellular applications and potent telomerase inhibitors, which can induce bladder T-24 tumor cell apoptosis by targeting telomerase, together with induction of mitochondrial dysfunction, telomere DNA damage and cell-cycle arrest. Importantly, T-24 tumor inhibition rate (TIR) was 50.4% for Pt2, which was higher than that of Pt1 (26.4%) and cisplatin (37.1%). Taken together, all the results indicated that jatrorrhizine and berberine derivatives Pt1 and Pt2 show low toxicity and could be novel Pt-based anti-cancer drug candidates. The results came from multiple reactions, including the reaction of Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Quality Control of Bis(pyridin-2-ylmethyl)amine)

Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0) is a secondary amine with two picolyl substituents. The compound is a tridentate ligand in coordination chemistry and commonly used to produce Zn-based chemosensors/probes, such as Zinpry.Quality Control of Bis(pyridin-2-ylmethyl)amine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Related Products of 103-74-2In 2017 ,《Mechanism and Stereocontrol in Isotactic rac-Lactide Polymerization with Copper(II) Complexes》 appeared in ACS Catalysis. The author of the article were Daneshmand, Pargol; van der Est, Art; Schaper, Frank. The article conveys some information:

Reaction of N-R,N’-R’-2,5-diiminopyrroles (R = R’ = S-CH(Me)Ph; R = R’ = CH2Ph; R = S-CH(Me)Ph, R’ = H) with Cu(OMe)2 in the presence of chelating alcs., ROH (R1 = C2H4NMe2, R2 = C2H4Py, R3 = CH2Py, R4 = CMe2Py) yielded the dinuclear, alkoxide-bridged complexes L2Cu2(OR)2. The complexes catalyze the polymerization of rac-lactide at room temperature with catalyst concentrations of 1-3 mM in 4-24 h (v = k[cat][monomer] with k = [2.3(5)] × 102 – [6.5(6)] × 102 M-1 h-1). EPR and mechanistic studies indicate that the complexes remain dinuclear during the polymerization reaction. In complexes with OR1, both alkoxides of the dimer initiate polymerization, with OR2 or OR3 only one alkoxide initiates polymerization, and OR4 is inactive in polymerization The nature of the bridging ligand in the dinuclear complex determines stereocontrol. Independent of the spectator ligand L, complexes which retain an OR3 or OR4 bridging ligand in the active species show preference for isotactic polymerizations (Pm = 0.60-0.75), while those with only polymeryloxo bridges or OR2 as the bridging ligand provide atactic polymer. Stereocontrol follows a chain-end control mechanism, with the catalytic site likely adapting to the configuration of the chain end. In the part of experimental materials, we found many familiar compounds, such as 2-(2-Hydroxyethyl)pyridine(cas: 103-74-2Related Products of 103-74-2)

2-(2-Hydroxyethyl)pyridine(cas: 103-74-2) belongs to pyridine. The basicity and metallophilic high donor number of these π-deficient systems has long favored them as ligands in metal catalysis. The last decade saw pyridine assume a stronger role as functional group for directed C–H oxidation/activation.Related Products of 103-74-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Siddiqa, Ayesha; Zubair, Muhammad; Bilal, Muhammad; Rasool, Nasir; Qamar, Muhammad Usman; Khalid, Aqsa; Ahmad, Gulraiz; Imran, Muhammad; Mahmood, Sajid; Ashraf, Ghulam Abbas published an article in Pharmaceuticals. The title of the article was 《Synthesis of Functionalized N-(4-Bromophenyl)furan-2-carboxamides via Suzuki-Miyaura Cross-Coupling: Anti-Bacterial Activities against Clinically Isolated Drug Resistant A. baumannii, K. pneumoniae, E. cloacae and MRSA and Its Validation via a Computational Approach》.HPLC of Formula: 1692-25-7 The author mentioned the following in the article:

N-(4-Bromophenyl)furan-2-carboxamide I [R = Br] was synthesized by the reaction furan-2-carbonyl chloride and 4-bromoaniline in the presence of Et3N in excellent yields of 94%. The carboxamide I [R = Br] was arylated by employing triphenylphosphine palladium as a catalyst and K3PO4 as a base to afford N-(4-bromophenyl)furan-2-carboxamide analogs I [R = 4-MeC6H4, 4-MeOC6H4, 4-ClC6H4, etc.] in moderate to good yields (43-83%). Furthermore, in vitro anti-bacterial activities of the resp. compounds against clin. isolated drug-resistant bacteria A. baumannii, K. pneumoniae, E. cloacae and S. aureus was investigated. The mol. I [R = Br] was found to be the most effective activity against these bacteria, particularly NDM-pos. bacteria A. baumannii as compared to various com. available drugs. Docking studies and MD simulations further validated it, expressing the active site and mol. interaction stability. After reading the article, we found that the author used Pyridin-3-ylboronic acid(cas: 1692-25-7HPLC of Formula: 1692-25-7)

Pyridin-3-ylboronic acid(cas: 1692-25-7) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. HPLC of Formula: 1692-25-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Wang, Yiran; Fukuda, Masayuki; Nikolaev, Sergey; Miyake, Atsushi; Griffith, Kent J.; Nisbet, Matthew L.; Hiralal, Emily; Gautier, Romain; Fisher, Brandon L.; Tokunaga, Masashi; Azuma, Masaki; Poeppelmeier, Kenneth R. published an article in Inorganic Chemistry. The title of the article was 《Two Distinct Cu(II)-V(IV) Superexchange Interactions with Similar Bond Angles in a Triangular “”CuV2″” Fragment》.Reference of 4,4′-Dimethyl-2,2′-bipyridine The author mentioned the following in the article:

The strength and sign of superexchange interactions are often predicted on the basis of the bond angles between magnetic ions, but complications may arise in situations with a nontrivial arrangement of the magnetic orbitals. We report on a novel mol. tetramer compound [Cu(H2O)dmbpy]2[V2O2F8] (dmbpy = 4,4′-dimethyl-2,2′-bipyridyl) that is composed of triangular “”CuV2″” fragments and displays a spin gap behavior. By combining first-principles calculations and electronic models, we reveal that superexchange Cu-V interactions carry drastically different coupling strengths along two Cu-F-V pathways with comparable bond angles in the triangular “”CuV2″” fragment. Counterintuitively, their strong disparity is found to originate from the restricted symmetry of the half-filled Cu dx2-y2 orbital stabilized by the crystal field, leading to one dominating antiferromagnetic Cu-V coupling in each fragment. We revisit the magnetic properties of the reported spin-gapped chain compound [enH2]Cu(H2O)2[V2O2F8] (enH2 = ethylene diammonium) containing similar triangular “”CuV2″” fragments, and the magnetic behavior of the mol. tetramer and the chain compounds is rationalized as that of weakly coupled spin dimers and spin trimers, resp. This work demonstrates that fundamentally different magnetic couplings can be observed between magnetic ions with similar bond angles in a single spin motif, thus providing a strategy to introduce various exchange interactions combined with low dimensionality in heterometallic Cu(II)-V(IV) compounds The experimental process involved the reaction of 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Reference of 4,4′-Dimethyl-2,2′-bipyridine)

4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6) is used as a chemical Intermediate. It can be used for the determination of ferrous and cyanide compounds.Reference of 4,4′-Dimethyl-2,2′-bipyridine Furthermore, 4,4′-Dimethyl-2,2′-bipyridine is used in the synthesis of a series of o-phenanthroline-substituted ruthenium(II) complexes.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Xie, Chao; Lin, Longfei; Huang, Liang; Wang, Zixin; Jiang, Zhiwei; Zhang, Zehui; Han, Buxing published an article in 2021. The article was titled 《Zn-Nx sites on N-doped carbon for aerobic oxidative cleavage and esterification of C(CO)-C bonds》, and you may find the article in Nature Communications.Name: 4-Acetylpyridine The information in the text is summarized as follows:

Zn/NC-X catalysts, in which Zn2+ coordinated with N species on microporous N-doped carbon (NC) and X denoted the pyrolysis temperature, could effectively catalyze aerobic oxidative cleavage of C(CO)-C bonds and quant. converted acetophenone to Me benzoate with a yield of 99% at 100°C was reported. The Zn/NC-950 could be applied for a wide scope of acetophenone derivatives as well as more challenging alkyl ketones. Detail mechanistic investigations revealed that the catalytic performance of Zn/NC-950 could be attributed to the coordination between Zn2+ and N species to change the electronic state of the metal, synergetic effect of the Zn single sites with their surrounding N atoms, as well as the microporous structure with the high surface area and structural defects of the NC. In addition to this study using 4-Acetylpyridine, there are many other studies that have used 4-Acetylpyridine(cas: 1122-54-9Name: 4-Acetylpyridine) was used in this study.

4-Acetylpyridine(cas: 1122-54-9) belongs to pyridine. Pyridine is a relatively complex molecule and exhibits a number of different bands in IR spectra. Among others, the bands characterizing the ν8a and ν19b modes have been found to be sensitive to the coordination or protonation of the molecule. Note that the band that is diagnostic for the PyH+ ion at about 1545 cm− 1 (ν19b mode) does not overlap with any of the other bands.Name: 4-Acetylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Martinez, Kristina; Benson, Kaitlyn; Paul, Jared; Schmehl, Russell H. published an article in 2021. The article was titled 《Photophysics of Ru(II) complexes with hydroxylated diimine ligands: Photoinduced electron/proton transfer to anthraquinone》, and you may find the article in Polyhedron.Application In Synthesis of 2-Pyridinylboronic acid The information in the text is summarized as follows:

This manuscript reports the reaction of the 3MLCT excited states of two luminescent chromophores, [(bpy)2Ru(OHbpy)]2+ and [(bpy)2Ru(OMebpy)]2+ (bpy = 2,2′-bipyridine, OHbpy = 4-hydroxy-2,2′-bipyridine, OMebpy = 4-methoxy-2,2′-bipyridine), with anthraquinone (AQ). A series of luminescence, electrochem., spectrophotometric and transient absorption studies were done in order to determine free energies for the potential reaction paths between the photoexcited complexes and AQ. For the OMebpy complex, only excited state electron transfer (ET*) from the 3MLCT state of the complex to AQ was possible. However, for the OHbpy complex, the excited state could react with AQ via a variety of pathways including excited state electron transfer, ET*, excited state proton transfer (PT*) and excited state proton coupled electron transfer (PCET*). The thermodn. anal. revealed that, for the OHbpy complex PT* was very endergonic and not a viable reaction pathway, however both ET* and PCET* could occur. Luminescence quenching studies revealed that both the OHbpy and the OMebpy excited complexes reacted with AQ (kq ∼ 109 M-1s-1 for both). Transient absorption anal. showed that, for the OMebpy complex, no photoproducts escaped the encounter complex associated with the quenching reaction. The result is consistent with strong electrostatic association of the 3+/1- encounter complex. For the OHbpy complex transient absorption results clearly show the formation of PCET* products from the encounter complex. The result represents one of a small number of examples of excited states of chromophores reacting via proton coupled electron transfer within an encounter complex. The results came from multiple reactions, including the reaction of 2-Pyridinylboronic acid(cas: 197958-29-5Application In Synthesis of 2-Pyridinylboronic acid)

2-Pyridinylboronic acid(cas: 197958-29-5) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. Application In Synthesis of 2-Pyridinylboronic acid

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem