Category: pyridine-derivatives

Koseki, Shiro; Yoshinaga, Harunobu; Asada, Toshio; Matsushita, Takeshi published the artcile< Spin-orbit coupling analyses of phosphorescent processes in Ir(Zppy)3 (Z = NH2, NO2 and CN)>, Reference of 370878-69-6, the main research area is tris phenylpyridinato iridium complex phosphorescent process spin orbit coupling.

Substituent effects of NH2, NO2 and CN groups on phosphorescence in fac-tris(2-phenylpyridinato)iridium(III) [fac-Ir(ppy)3] were examined theor. by using the multiconfiguration SCF (MCSCF) method together with the SBKJC basis sets augmented by a set of polarization functions, followed by second-order CI (SOCI) and spin-orbit coupling (SOC) calculations, while time-dependent d. functional theory (TD DFT) calculations provided too long wavelengths for phosphorescent peaks at the geometries optimized for triplet states even though the TD DFT predictions were qual. good with respect to relative spectral shifts. The strongest electron-donating substituent NH2 and the strongest electron-withdrawing substituents, NO2 and CN, were chosen for investigation of the substituent effects in the present investigation. It was found that when these electron-withdrawing substituents are introduced into the Z5 sites, the largest blue shift is obtained for the emission spectra, while the introduction of the electron-donating NH2 substituent causes a red shift of the emission spectra. This is because the Z5 site has non-negligible coefficients in the HOMO (HOMO) and can interact with the π* orbitals of the substituents. This interaction makes the HOMO lower in energy. This is the reason why a large blue shift of the emission peak is obtained when one of these substituents is introduced to the Z5 sites. Based on the results of the calculation, it can be said that the best material for blue-color emission is tris(5-nitro-2-phenylpyridinato) iridium(III) [fac-Ir(5-NO2ppy)3] or tris(5-nitro-4,6-difluoro-2-phenylpyridinato)iridium(III) [fac-Ir(5-NO2-4,6-dfppy)3]. If the reactivity of the NO2 substituent in the lowest triplet state becomes troublesome in the synthesis processes and/or if it is difficult to choose host mols. for an emissive layer, tris(5-cyano-3,4,6-trifluoro-2-phenylpyridinato)iridium(III) [fac-Ir(5-CN-3,4,6-tfppy)3] would be the most appropriate for blue-color emission.

RSC Advances published new progress about Bond angle. 370878-69-6 belongs to class pyridine-derivatives, and the molecular formula is C33H21F3IrN3, Reference of 370878-69-6.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Howlader, Prodip; Ahmed, Shakil; Mondal, Surajit; Zangrando, Ennio; Mukherjee, Partha Sarathi published the artcile< Conformation-Selective Self-Assembly of Pd6 Trifacial Molecular Barrels Using a Tetrapyridyl Ligand>, Application of C7H7NO, the main research area is Conformation Selective Self Assembly palladium trifacial mol barrel tetrapyridyl; crystallog NMR Self Assembly palladium trifacial mol barrel tetrapyridyl.

A conformationally flexible tetrapyridyl ligand L was assembled sep. with three cis-blocked 90° PdII acceptors (M1, M2, and M3) containing different blocking diamines. Surprisingly, different conformations of the donor L were arrested by the acceptors depending on the nature of the blocking amine, leading to the formation of isomeric Pd6 barrels (B1, B2, and B3). B2 and B3 with larger windows have been used to encapsulate polyaromatic hydrocarbons.

Inorganic Chemistry published new progress about Conformation. 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, Application of C7H7NO.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Haward, Simon J.; Hopkins, Cameron C.; Shen, Amy Q. published the artcile< Stagnation points control chaotic fluctuations in viscoelastic porous media flow>, Safety of 1-Hexadecylpyridin-1-ium chloride, the main research area is viscoelastic porous media flow; elastic turbulence; porous media; stagnation point; viscoelastic fluid.

Viscoelastic flows through porous media become unstable and chaotic beyond critical flow conditions, impacting widespread industrial and biol. processes such as enhanced oil recovery and drug delivery. Understanding the influence of the pore structure or geometry on the onset of flow instability can lead to fundamental insights into these processes and, potentially, to their optimization. Recently, for viscoelastic flows through porous media modeled by arrays of microscopic posts, Walkama et al. [D. M. Walkama, N. Waisbord, J. S. Guasto, Phys. Rev. Lett. 124, 164501 (2020)] demonstrated that geometric disorder greatly suppressed the strength of the chaotic fluctuations that arose as the flow rate was increased. However, in that work, disorder was only applied to one originally ordered configuration of posts. Here, we demonstrate exptl. that, given a slightly modified ordered array of posts, introducing disorder can also promote chaotic fluctuations. We provide a unifying explanation for these contrasting results by considering the effect of disorder on the occurrence of stagnation points exposed to the flow field, which depends on the nature of the originally ordered post array. This work provides a general understanding of how pore geometry affects the stability of viscoelastic porous media flows.

Proceedings of the National Academy of Sciences of the United States of America published new progress about Birefringence. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Safety of 1-Hexadecylpyridin-1-ium chloride.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Wang, Jianjian; Tang, Qingjie; Jin, Shiwei; Wang, Yanxin; Yuan, Ziliang; Chi, Quan; Zhang, Zehui published the artcile< Mild and selective hydrogenation of nitriles into primary amines over a supported Ni catalyst>, Electric Literature of 3731-53-1, the main research area is selective hydrogenation nitrile nickel catalyst alumina support green chem.

The development of new heterogeneous non-noble catalytic systems for the selective hydrogenation of nitriles into primary amines is a challenging task. In this study, a mesoporous Al2O3-supported Ni catalyst (denoted as Ni/Al2O3-600, where 600 represents the reduction temperature) demonstrated a high catalytic activity for the hydrogenation of nitriles under mild conditions (60-80°C and 2.5 bar H2) with ammonia as the additive. This catalytic system has a wide substrate range; and the Ni/Al2O3 catalyst demonstrated a good tolerance to other functional groups, which was possibly due to its high catalytic activity under mild conditions. A plausible reaction pathway was proposed for the hydrogenation of nitriles into primary amines, and it was found that ammonia played a great role in the enhancement of the selectivity of primary amines by the inhibition of the side reaction to generate secondary amines. In addition, the Ni/Al2O3-600 catalyst could be reused five times without activity loss through convenient magnetic recovery.

New Journal of Chemistry published new progress about Aromatic nitriles Role: RCT (Reactant), RACT (Reactant or Reagent). 3731-53-1 belongs to class pyridine-derivatives, and the molecular formula is C6H8N2, Electric Literature of 3731-53-1.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Rassolov, Peter; Scigliani, Alfredo; Mohammadigoushki, Hadi published the artcile< Kinetics of shear banding flow formation in linear and branched wormlike micelles>, COA of Formula: C21H38ClN, the main research area is kinetics shear banding flow formation wormlike micelle.

We investigate the flow evolution of a linear and a branched wormlike micellar solution with matched rheol. in a Taylor-Couette (TC) cell using a combination of particle-tracking velocimetry, birefringence, and turbidity measurements. Both solutions exhibit a stress plateau within a range of shear rates. Under startup of a steady shear rate flow within the stress plateau, both linear and branched samples exhibit strong transient shear thinning flow profiles. However, while the flow of the linear solution evolves to a banded structure at longer times, the flow of the branched solution transitions to a curved velocity profile with no evidence of shear banding. Flow-induced birefringence measurements indicate transient birefringence banding with strong micellar alignment in the high shear band for the linear solution The transient flow-induced birefringence is stronger for the branched system at an otherwise identical Wi. At longer times, the birefringence bands are replaced by a chaotic flow reminiscent of elastic instabilities. Visualization of the flow-induced turbidity in the velocity gradient-vorticity plane reveals quasi-steady banding with a turbidity contrast between high and low shear bands in the linear solution However, the turbidity evolves uniformly within the gap of the TC cell for the branched solution, corroborating the non-banded quasi-steady velocimetry results. Finally, we show that while elastic instabilities in the linear solution emerge in the high shear band, the flow of branched solution at high Wi becomes unstable due to end effects, with growing end regions that ultimately span the entire axial length of the TC cell.

Soft Matter published new progress about Chemical chains, wormlike. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, COA of Formula: C21H38ClN.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Guo, Jing-Yao; Minko, Yury; Santiago, Celine B.; Sigman, Matthew S. published the artcile< Developing Comprehensive Computational Parameter Sets To Describe the Performance of Pyridine-Oxazoline and Related Ligands>, Application In Synthesis of 1416819-91-4, the main research area is oxazoline pyridine quinoline ligand computational parameter set catalytic performance.

The applicability of computational descriptors extracted from metal pyridine-oxazoline complexes to relate both site and enantioselectivity to structural diversity was investigated. A group of computationally derived features (e.g., metal NBO charges, steric descriptors, torsion angles) were acquired for a library of pyridine-oxazoline ligands. Correlation studies were employed to examine steric/electronic features described by each descriptor, followed by application of the said descriptors in modeling the results of two reaction types, the site-selective redox-relay Heck reaction and the enantioselective Carroll rearrangement, affording simple, well-validated models. Through exptl. validation and extrapolation, parameters derived from ground state metal complexes were found to be advantageous over those from the free ligand.

ACS Catalysis published new progress about Bond angle, torsional. 1416819-91-4 belongs to class pyridine-derivatives, and the molecular formula is C13H15F3N2O, Application In Synthesis of 1416819-91-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Araujo, Jose Weliton de Oliveira; Moura-Moreira, Mayra; Del Nero, Jordan published the artcile< Electronic transport via DTF-NEGF at bipyridine junctions with 1D organic electrodes>, Name: 2,4-Bipyridine, the main research area is bipyridine junction electronic transport electrode field effect transistor.

In this work, we study the properties of electronic transport in mol. junctions formed by bipyridine isomers as central region coupled at electrodes of carbyne wires. Through calculations of first principles, based on D. Functional Theory (DFT), combined with Non-Equilibrium Green′s Functions (NEGF), we obtain important properties such as elec. current, differential conductance, transmission, and eigenchannels. The results showed that the presence of nitrogen atoms in the mol.-electrode interface strongly affects the coupling of the junction, providing better electronic conduction; this is corroborated by the transmission eigenchannels. The transport properties analyzed revealed that in bipyridine bridges, devices with carbyne electrodes, presented better performance when compared to other works that used metallic electrodes (Au, Ag, and Cu) or graphene nanoribbons electrodes. The devices proposed showed a Field Effect Transistor (FET) behavior when are formed by sym. isomers, whereas for asym. systems we obtained characteristics of Mol. Diode (MD).

Physica E: Low-Dimensional Systems & Nanostructures (Amsterdam, Netherlands) published new progress about Bias potential. 581-47-5 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, Name: 2,4-Bipyridine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Szlavik, Zoltan; Csekei, Marton; Paczal, Attila; Szabo, Zoltan B.; Sipos, Szabolcs; Radics, Gabor; Proszenyak, Agnes; Balint, Balazs; Murray, James; Davidson, James; Chen, Ijen; Dokurno, Pawel; Surgenor, Allan E.; Daniels, Zoe Marie; Hubbard, Roderick E.; Le Toumelin-Braizat, Gaetane; Claperon, Audrey; Lysiak-Auvity, Gaelle; Girard, Anne-Marie; Bruno, Alain; Chanrion, Maia; Colland, Frederic; Maragno, Ana-Leticia; Demarles, Didier; Geneste, Olivier; Kotschy, Andras published the artcile< Discovery of S64315, a Potent and Selective Mcl-1 Inhibitor>, Category: pyridine-derivatives, the main research area is S64315 discovery Mcl1 inhibitor anticancer.

Myeloid cell leukemia 1 (Mcl-1) has emerged as an attractive target for cancer therapy. It is an antiapoptotic member of the Bcl-2 family of proteins, whose upregulation in human cancers is associated with high tumor grade, poor survival, and resistance to chemotherapy. Here we report the discovery of our clin. candidate S64315, a selective small mol. inhibitor of Mcl-1. Starting from a fragment derived lead compound, we have conducted structure guided optimization that has led to a significant (3 log) improvement of target affinity as well as cellular potency. The presence of hindered rotation along a biaryl axis has conferred high selectivity to the compounds against other members of the Bcl-2 family. During optimization, we have also established predictive PD markers of Mcl-1 inhibition and achieved both efficient in vitro cell killing and tumor regression in Mcl-1 dependent cancer models. The preclin. candidate has drug-like properties that have enabled its development and entry into clin. trials.

Journal of Medicinal Chemistry published new progress about Antitumor agents. 329214-79-1 belongs to class pyridine-derivatives, and the molecular formula is C11H16BNO2, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Gaugaz, Fabienne Zdenka; Chicca, Andrea; Redondo-Horcajo, Mariano; Barasoain, Isabel; Fernando Diaz, J.; Altmann, Karl-Heinz published the artcile< Synthesis, microtubule-binding affinity, and antiproliferative activity of new epothilone analogs and of an EGFR-targeted epothilone-peptide conjugate>, Application In Synthesis of 2127-03-9, the main research area is colorectal adenocarcinoma EGFR microtubule binding affinity antiproliferative; cancer; drug discovery; epothilone; medicinal chemistry; microtubule-stabilizing agents; prodrug; total synthesis; tumor-targeting.

A new simplified, epoxide-free epothilone analog was prepared incorporating an N-(2-hydroxyethyl)-benzimidazole side chain, which binds to microtubules with high affinity and inhibits cancer cell growth in vitro with nM potency. Building on this scaffold, a disulfide-linked conjugate with the purported EGFR-binding (EGFR, epidermal growth factor receptor) peptide GE11 was then prepared The conjugate retained significant microtubule-binding affinity, in spite of the size of the peptide attached to the benzimidazole side chain. The antiproliferative activity of the conjugate was significantly lower than for the parent scaffold and, surprisingly, was independent of the EGFR expression status of cells. Our data indicate that the disulfide-based conjugation with the GE11 peptide is not a viable approach for effective tumor-targeting of highly potent epothilones and probably not for other cytotoxics.

International Journal of Molecular Sciences published new progress about Affinity (binding). 2127-03-9 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2S2, Application In Synthesis of 2127-03-9.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Palat, K. Jr.; Braunerova, G.; Miletin, M.; Buchta, V. published the artcile< Synthesis and antifungal activity of alkyl and arylsulfanylpyridinylguanidines>, Recommanded Product: 2-Bromo-6-chloropyridin-3-amine, the main research area is pyridinylguanidine alkylsulfanyl derivative preparation antifungal activity; pyridylguanidine arylsulfanyl derivative preparation antimicrobial activity.

A series of alkyl- and arylsulfanylpyridylguanidines was synthesized and their antimicrobial activity was evaluated in vitro against eight potentially pathogenic strains of fungi. Compounds with an alkylsulfanyl substitution have antifungal activity, which improves with increasing length of the aliphatic chain.

Chemical Papers published new progress about Antimicrobial agents. 1050501-88-6 belongs to class pyridine-derivatives, and the molecular formula is C5H4BrClN2, Recommanded Product: 2-Bromo-6-chloropyridin-3-amine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem