Day: October 14, 2022

Cao, Bing-Jun; Li, Ran; Huang, Xi-He published the artcile< Synthesis, structure and photophysical properties of two tetranuclear copper(I) iodide complexes based on acetylpyridine and diphosphine mixed ligands>, Application of C7H7NO, the main research area is copper iodide complex acetylpyridine diphosphine ligand structure photophys property; TADF; acetylpyridine; bis(diphenyphosphanyl)propane; cluster; copper(I) iodide; crystal structure; photoluminescence; tetramer; thermally activated delayed fluorescence.

Two copper(I) iodide tetramers, namely, [μ2-1,3-bis(diphenylphosphanyl)propane-κ2P:P′]di-μ3-iodido-di-μ2-iodido-[1-(pyridin-3-yl)ethan-1-one-κN]tetracopper(I) dichloromethane disolvate, [Cu4I4(C6H7NO)2(C27H26P2)2]·2CH2Cl2 (CuL3), and [μ2-1,3-bis(diphenylphosphanyl)propane-κ2P:P′]di-μ3-iodido-di-μ2-iodido-[1-(pyridin-4-yl)ethan-1-one-κN]tetracopper(I), [Cu4I4(C6H7NO)2(C27H26P2)2] (CuL4), have been synthesized from reactions of CuI, 1,3-bis(diphenylphosphanyl)propane (dppp) and 3- or 4-acetylpyridine (3/4-acepy). The complexes were characterized by elemental anal., IR spectroscopy, single-crystal X-ray diffraction (XRD), powder XRD and photoluminescence spectroscopy. Both complexes possess a stair-step [Cu4I4] cluster structure with a crystallog. inversion center located in the middle of a Cu2I2 ring (Z′ = 1/2). The dppp ligands each adopt a bidentate coordination mode that bridges two CuI centers on one side of the [Cu4I4] cluster and the acepy ligands act as terminal ligands. The solid-state samples of similar complexes show highly efficiency thermally activated delayed fluorescence (TADF) at room temperature At ambient temperature, both CuL3 and CuL4 exhibit photoluminescence, with a maximum emission in the region 560-580 nm and with short emissive decay times, but only phosphorescence was observed at 77 K. The narrow gaps between the higher lying singlet state and the triplet state, ΔE(S1 – T1), also confirm the presence of TADF. Structure anal. and consideration of photoluminescence indicates that the position of the acetyl group on the heterocyclic ligand has an obvious influence on the structural arrangement, on intermol. interactions and on the observed photophys. properties.

Acta Crystallographica, Section C: Structural Chemistry published new progress about Absorption spectra. 350-03-8 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO, Application of C7H7NO.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Yang, Cheng; Xie, Hao published the artcile< Multiple fluorescence response behaviours to proteins/bacteria and selective antibacterial activity of cetylpyridinium chloride (CPC)-based cationic carbon dots>, Formula: C21H38ClN, the main research area is fluorescence cetylpyridinium chloride cationic carbon dot.

Direct interaction between carbon dots (CDs) and biomols. leads to changes in the chem. and phys. status as well as properties of CDs, which can have various biol. and biomedical applications. In this work, the surface of CDs was modified with cetylpyridinium chloride (CPC) to facilitate interactions between CDs and biomols. Multiple fluorescence response behaviors of CPC-based CDs were observed towards several proteins (bovine serum albumin, lysozyme, protamine, and Hb) and bacterial cells (Escherichia coli and Staphylococcus aureus). Electrostatic attraction and hydrogen bonding were involved in inducing aggregation of CDs and fluorence enhancement. An inner filter effect might also occur to reduce fluorescence of CDs when interacting with proteins. Selective antibacterial activity of CPC-based CDs was observed towards Gram pos. bacterium Staphylococcus aureus. This work provides potential to develop CD-based techniques for detecting and visualizing proteins/bacteria as well as selective antibacterial agents towards Gram-pos. bacteria.

RSC Advances published new progress about Antibacterial agents. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Formula: C21H38ClN.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Schwarze, Benedikt; Sobottka, Sebastian; Schiewe, Robert; Sarkar, Biprajit; Hey-Hawkins, Evamarie published the artcile< Spectroscopic and Electronic Properties of Molybdacarborane Complexes with Non-innocently Acting Ligands>, Formula: C10H8N2, the main research area is molybdacarborane containing bipyridine phenanthroline noninnocent ligand preparation electrochem; crystal structure molybdacarborane containing bipyridine phenanthroline noninnocent ligand; mol structure molybdacarborane containing bipyridine phenanthroline noninnocent ligand; Raman spectroscopy; carborane; density functional theory calculations; molybdacarborane; spectroelectrochemistry.

The molybdacarboranes [3-{L-κ2N,N}-3-(CO)2-closo-3,1,2-MoC2B9H11] (L = 2,2′-bipyridine (2,2′-bpy, 1a) or 1,10-phenanthroline (1,10-phen, 1b)) incorporating known potentially noninnocent ligands (CO, 2,2′-bpy, 1,10-phen) and the nonspectator nido-carborane ([η5-C2B9H11]2-) ligand were prepared and fully characterized. High-resolution mass spectrometry, single-crystal x-ray diffraction methods, spectroscopy (IR, (resonance) Raman, NMR), cyclic voltammetry and spectroelectrochem. (electrochem. properties) were supported by theor. studies of the electronic structure (DFT, CAS-SCF, TD-DFT).

Chemistry – A European Journal published new progress about Carboranes Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), SPN (Synthetic Preparation), PROC (Process), PREP (Preparation) (molybdacarboranes containing N,N-donor ligands). 366-18-7 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, Formula: C10H8N2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Li, Wenbin; Sidhik, Siraj; Traore, Boubacar; Asadpour, Reza; Hou, Jin; Zhang, Hao; Fehr, Austin; Essman, Joseph; Wang, Yafei; Hoffman, Justin M.; Spanopoulos, Ioannis; Crochet, Jared J.; Tsai, Esther; Strzalka, Joseph; Katan, Claudine; Alam, Muhammad A.; Kanatzidis, Mercouri G.; Even, Jacky; Blancon, Jean-Christophe; Mohite, Aditya D. published the artcile< Light-activated interlayer contraction in two-dimensional perovskites for high-efficiency solar cells>, Name: Pyridin-4-ylmethanamine, the main research area is light activated interlayer contraction 2D perovskite solar cell.

Abstract: Understanding and tailoring the phys. behavior of halide perovskites under practical environments is critical for designing efficient and durable optoelectronic devices. Here, we report that continuous light illumination leads to >1% contraction in the out-of-plane direction in two-dimensional hybrid perovskites, which is reversible and strongly dependent on the specific superlattice packing. XPS measurements show that constant light illumination results in the accumulation of pos. charges in the terminal iodine atoms, thereby enhancing the bonding character of inter-slab I-I interactions across the organic barrier and activating out-of-plane contraction. Correlated charge transport, structural and photovoltaic measurements confirm that the onset of the light-induced contraction is synchronized to a threefold increase in carrier mobility and conductivity, which is consistent with an increase in the electronic band dispersion predicted by first-principles calculations Flux-dependent space-charge-limited current measurement reveals that light-induced interlayer contraction activates interlayer charge transport. The enhanced charge transport boosts the photovoltaic efficiency of two-dimensional perovskite solar cells up to 18.3% by increasing the device′s fill factor and open-circuit voltage.

Nature Nanotechnology published new progress about Band gap. 3731-53-1 belongs to class pyridine-derivatives, and the molecular formula is C6H8N2, Name: Pyridin-4-ylmethanamine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Parrot, Isabelle; Bisi, Helene; Folliard, Arnaud; Bonnard, Michel published the artcile< Volatile Compounds from Flowers of Elaeagnus x submacrophylla Servett.: Extraction, Identification of Flavonoids, and Antioxidant Capacity>, Product Details of C7H7NO2, the main research area is Elaeagnus submacrophylla flavonoid volatile compound extraction antioxidant capacity; Elaeagnus submacrophylla; antioxidants; flavonoids; phenolic content; volatile compounds.

Beneficial to the ecosystem and with significant potential in permaculture, Elaeagnus x submacrophylla Servett. was studied here mainly for the identification of its floral odorants. After olfactory evaluation and determination of the volatile profile of freshly picked flowers by headspace/solid phase microextraction coupled with gas chromatog./mass spectrometry, an ethanolic extract was prepared and investigated for its antioxidant capacity. Unusual mols. were identified in the floral headspace, such as isochavicol or chrysanthemum acetate. The evaluation of the in vitro free radical scavenging capacity (from 0.4 to 1.3 mmol TE/g) and total phenolic content (65.1 mg GAE/g) of the extract pointed out a promising antioxidant activity, potentially related to the identification of several flavonoid glycosides. These results have to be considered in the context of the ever-increasing need to produce innovative natural extracts with notably interesting claims for the cosmetic field.

ChemPlusChem published new progress about Alcohols Role: ANT (Analyte), FFD (Food or Feed Use), PAC (Pharmacological Activity), ANST (Analytical Study), BIOL (Biological Study), USES (Uses). 93-60-7 belongs to class pyridine-derivatives, and the molecular formula is C7H7NO2, Product Details of C7H7NO2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Bazyar, Zahra; Hosseini-Sarvari, Mona published the artcile< Au@ZnO Core-Shell: Scalable Photocatalytic Trifluoromethylation Using CF3CO2Na as an Inexpensive Reagent under Visible Light Irradiation>, Application In Synthesis of 3796-23-4, the main research area is trifluoromethylated compound preparation; photocatalytic trifluoromethylation gold nanoparticle modified zincoxide photocatalyst.

Trifluoromethylation is of significant importance for the synthesis of many small mols. vital for medicinal and agrochem. research. The importance of the CF3 group as well as the related synthetic challenges is so evident that many reagents have been reported for the synthesis of trifluoromethylated compounds, but these typical reagents are expensive and the methods for preparing them are difficult. Here, we report a new scalable and operationally simple trifluoromethylation reaction using sodium trifluoroacetate as a reagent and Au-modified ZnO as a photocatalyst under visible light irradiation The reaction proceeds via trifluoromethylation of a broad range of aryl halides, arylboronic acids, and arene and heteroarene substrates. Some pharmaceutical and agrochem. compounds have been trifluoromethylated directly to demonstrate the applicability of the method.

Organic Process Research & Development published new progress about Aryl halides Role: RCT (Reactant), RACT (Reactant or Reagent). 3796-23-4 belongs to class pyridine-derivatives, and the molecular formula is C6H4F3N, Application In Synthesis of 3796-23-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zhang, Song-Lin; Deng, Zhu-Qin published the artcile< Synthesis of quinolines and naphthyridines via catalytic retro-aldol reaction of β-hydroxyketones with ortho-aminobenzaldehydes or nicotinaldehydes>, Application In Synthesis of 55279-29-3, the main research area is quinoline naphthyridine preparation copper catalyst retro aldol hydroxyketone aldehyde.

A Cu(I)-catalyzed retro-aldol reaction of β-hydroxyketones with ortho-aminobenzaldehydes and nicotinaldehydes is reported that produces a range of quinolines and naphthyridines with high efficiency and selectivity. This reaction uses β-hydroxyketones as a regiospecific ketone-protected enolate source via copper-catalyzed retro-aldol Cα-Cβ bond cleavage. The in situ generated copper enolate undergoes kinetically favorable cyclization with ortho-amino aryl aldehydes to produce quinolines and naphthyridines in a chemo- and regioselective manner. The mild and weakly basic reaction conditions also suppress possible side reactions of benzaldehydes under strongly basic conditions, resulting in improved reaction yields.

Organic & Biomolecular Chemistry published new progress about Aldehydes Role: RCT (Reactant), RACT (Reactant or Reagent) (nicotine-). 55279-29-3 belongs to class pyridine-derivatives, and the molecular formula is C6H6N2O, Application In Synthesis of 55279-29-3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Duklan, Neha; Chamoli, Pankaj; Raina, K. K.; Shukla, Ravi K. published the artcile< Dye dispersed lyotropic liquid crystals: Soft materials with high ionic conductivity and self-sustained adsorbents for dye sequestration>, Recommanded Product: 1-Hexadecylpyridin-1-ium chloride, the main research area is cetylpyridinium chloride liquid crystal preparation dye sequestration adsorption.

Lyotropic liquid crystals phases are prepared from cationic surfactant (Cetylpyridinium chloride) in the aqueous medium. All the mixtures show well defined lamellar phases duly confirmed from X-ray diffraction and polarizing optical microscopy characterizations. Ionic conductivity of the lyotropic phases is ranging between 4.2 and 28.8 mS/cm and shows dependence on surfactant concentration Further, lamellar mesostructures are dispersed with cationic dye (methyl blue). We noticed that bilayer mesostructures act as an excellent adsorbent to sequester the cationic dye in the aqueous medium. Dye sequestration is confirmed visually and spectroscopically via UV-Visible characterization. Lyotropic adsorbents are found highly reactive as they sequester 0.01 wt% methyl blue dye within 30 min. Sequestration efficiency of lyotropic adsorbents is ranging from 98.9 to 87.5% (for 0.01 wt% dye). Considering electrostatic interactions, dye sequestration mechanisms are established and discussed. Our findings suggested that lyotropic adsorbents can be explored as a highly effective, reactive and cost-effective alternative for sequestration/adsorption of contaminations.

Inorganic Chemistry Communications published new progress about Adsorption. 123-03-5 belongs to class pyridine-derivatives, and the molecular formula is C21H38ClN, Recommanded Product: 1-Hexadecylpyridin-1-ium chloride.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Jiao, Zhi-Feng; Zhao, Ji-Xiao; Guo, Xiao-Ning; Tong, Xi-Li; Zhang, Bin; Jin, Guo-Qiang; Qin, Yong; Guo, Xiang-Yun published the artcile< Turning the product selectivity of nitrile hydrogenation from primary to secondary amines by precise modification of Pd/SiC catalysts using NiO nanodots>, Recommanded Product: Pyridin-4-ylmethanamine, the main research area is nickel oxide palladium silicon carbide support preparation; nitrile nickel oxide palladium catalyst selective hydrogenation; amine preparation green chem.

The selectivity of Pd/SiC catalysts for the hydrogenation of nitriles with H2 can be turned from primary to secondary amines by modification of NiO nanodots. In the modified catalysts, the NiO nanodots act as reactive sites to consume hydrogen radicals on the Pd surface, and thus prolong the lifetime of an imine intermediate that determines the product selectivity. Under mild conditions (30 °C, atm. H2), Pd/SiC and NiO-Pd/SiC catalysts exhibit high selectivity to primary (94%) and secondary (99%) amines, resp.

Catalysis Science & Technology published new progress about Amines Role: SPN (Synthetic Preparation), PREP (Preparation). 3731-53-1 belongs to class pyridine-derivatives, and the molecular formula is C6H8N2, Recommanded Product: Pyridin-4-ylmethanamine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Hickey, David P.; Sandford, Christopher; Rhodes, Zayn; Gensch, Tobias; Fries, Lydia R.; Sigman, Matthew S.; Minteer, Shelley D. published the artcile< Investigating the Role of Ligand Electronics on Stabilizing Electrocatalytically Relevant Low-Valent Co(I) Intermediates>, Safety of (S)-4-(tert-Butyl)-2-(5-(trifluoromethyl)pyridin-2-yl)-4,5-dihydrooxazole, the main research area is bidentate ligand electronics cobalt complex electrochem low valence intermediate.

Cobalt complexes have shown great promise as electrocatalysts in applications ranging from hydrogen evolution to C-H functionalization. However, the use of such complexes often requires polydentate, bulky ligands to stabilize the catalytically active Co(I) oxidation state from deleterious disproportionation reactions to enable the desired reactivity. Herein, we describe the use of bidentate electronically asym. ligands as an alternative approach to stabilizing transient Co(I) species. Using disproportionation rates of electrochem. generated Co(I) complexes as a model for stability, we measured the relative stability of complexes prepared with a series of N,N-bidentate ligands. While the stability of Co(I)Cl complexes demonstrates a correlation with exptl. measured thermodn. properties, consistent with an outer-sphere electron transfer process, the set of ligated Co(I)Br complexes evaluated was found to be preferentially stabilized by electronically asym. ligands, demonstrating an alternative disproportionation mechanism. These results allow a greater understanding of the fundamental processes involved in the disproportionation of organometallic complexes and have allowed the identification of cobalt complexes that show promise for the development of novel electrocatalytic reactions.

Journal of the American Chemical Society published new progress about Activation energy. 1416819-91-4 belongs to class pyridine-derivatives, and the molecular formula is C13H15F3N2O, Safety of (S)-4-(tert-Butyl)-2-(5-(trifluoromethyl)pyridin-2-yl)-4,5-dihydrooxazole.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem