Tag: 100-200

《A Comparative Investigation of the Role of the Anchoring Group on Perylene Monoimide Dyes in NiO-Based Dye-Sensitized Solar Cells》 was written by Farre, Yoann; Maschietto, Federica; Foehlinger, Jens; Wykes, Mike; Planchat, Aurelien; Pellegrin, Yann; Blart, Errol; Ciofini, Ilaria; Hammarstroem, Leif; Odobel, Fabrice. Application In Synthesis of 4-Ethynylpyridine And the article was included in ChemSusChem in 2020. The article conveys some information:

The anchoring group of a sensitizer may strongly affect the overall properties and stability of the resulting dye-sensitized solar cells (DSSCs) and dye-sensitized photoelectrosynthetic solar cells (DSPECs). The properties of seven perylene monoimide (PMI) dyes have been comprehensively studied for their immobilization on nanocrystalline NiO film. The PMI dyes differ only by the nature of the anchoring group, which are: carboxylic acid (PMI-CO2H), phosphonic acid (PMI-PO3H2), acetyl acetone (PMI-acac), pyridine (PMI-Py), aniline (PMI-NH2), hydroxyquinoline (PMI-HQ), and dipicolinic acid (PMI-DPA). The dyes are investigated by cyclic voltammetry and spectroelectrochem. and modeled by TD-DFT quantum chem. calculations The mode of binding of these anchoring groups is investigated by IR spectroscopy and the stability of the binding to NiO surface is studied by desorption experiments in acidic and basic media. The phosphonic acid group is found to offer the strongest binding to the NiO surface in terms of stability and dye loading. Finally, a photophys. study by ultrafast transient absorption spectroscopy shows that all dyes inject a hole in NiO with rate constants on a subpicosecond timescale and display similar charge recombination kinetics. The photovoltaic properties of the dyes show that PMI-HQ and PMI-acac give the highest photovoltaic performances, owing to a lower degree of aggregation on the surface. In the part of experimental materials, we found many familiar compounds, such as 4-Ethynylpyridine(cas: 2510-22-7Application In Synthesis of 4-Ethynylpyridine)

4-Ethynylpyridine(cas: 2510-22-7) belongs to pyridine. Pyridine derivatives lend themselves to many roles in the spirited field of supramolecular chemistry – whether as the ligand backbone of metal-organic polymers or presiding over the key electronic stations of nanodevices. In biochemistry, pyridine-containing cofactors are necessary nutrients on which our lives depend. Application In Synthesis of 4-Ethynylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Highly efficient removal of Cu(II) by novel dendritic polyamine-pyridine-grafted chitosan beads from complicated salty and acidic wastewaters》 was published in RSC Advances in 2020. These research results belong to Wang, Li-Li; Ling, Chen; Li, Bang-Sen; Zhang, Da-Shuai; Li, Chen; Zhang, Xiao-Peng; Shi, Zai-Feng. Reference of Bis(pyridin-2-ylmethyl)amine The article mentions the following:

In this study, dendritic polyamine chitosan beads with and without 2-aminomethyl pyridine were facilely prepared and characterized. Compared to CN (without the pyridine function), more adsorption active sites, larger pores, higher nitrogen content, higher sp. surface area, and higher strength could be obtained for CNP (with the pyridine function). CNP microspheres afforded a larger adsorption capacity than those obtained by CN for different pH values; further, the uptake amounts of Cu(II) were 0.84 and 1.12 mmol g-1 for CN and CNP beads, resp., at pH 5. The CNP microspheres could scavenge Cu(II) from highly acidic and salty solutions: the maximum simulated uptake amount of 1.93 mmol g-1 at pH 5 could be achieved. Due to the strong bonding ability and weakly basic property of pyridine groups, the adsorption capacity of Cu(II) at pH 1 was 0.75 mmol g-1 in highly salty solutions, which was comparative to those obtained from the com. pyridine chelating resin M4195 (QCu(II) = 0.78 mmol g-1 at pH 1). In addition, a distinct salt-promotion effect could be observed for CNP beads at both pH 5 and 1. Therefore, the prepared adsorbent CNP beads can have promising potential applications in the selective capturing of heavy metals in complex solutions with higher concentrations of H+ and inorganic salts, such as wastewaters from electroplating liquid and battery industries. In the experiment, the researchers used Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Reference of Bis(pyridin-2-ylmethyl)amine)

Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0) is a secondary amine with two picolyl substituents. As a tridentate ligand this compound provides three nitrogen donors that affords good selectivity for Zn2+ over biologically relevant metals such as Na+, K+, Mg2+ and Ca2+, and leaves coordination sites free for anion binding. Reference of Bis(pyridin-2-ylmethyl)amine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

《Metal-Free Radical-Mediated C(sp3)-H Heteroarylation of Alkanes》 was published in Organic Letters in 2020. These research results belong to Shao, Xin; Wu, Xinxin; Wu, Shuo; Zhu, Chen. COA of Formula: C6H4N2 The article mentions the following:

Herein we disclose a metal-free, N/O-centered radical-promoted Minisci reaction, in which the coupling of various heteroarenes with simple alkanes proceeds under mild conditions. The reaction conditions are neutral; no extra acid is added to preactivate N-heteroarenes in the Minisci reaction. The N-/O-centered radicals are generated directly from amide (TsNHMe) or alc. (CF3CH2OH) under visible-light irradiation This green and eco-friendly synthetic process may find potential use in medicinal chem. The experimental part of the paper was very detailed, including the reaction process of 4-Cyanopyridine(cas: 100-48-1COA of Formula: C6H4N2)

4-Cyanopyridine(cas: 100-48-1) belongs to pyridine. Pyridine is widely used in the precursor to agrochemicals and pharmaceuticals. Also, it is used as an important reagent and organic solvent.COA of Formula: C6H4N2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2019,Chemical Science included an article by Cao, Jia; Wang, Guoqiang; Gao, Liuzhou; Chen, Hui; Liu, Xueting; Cheng, Xu; Li, Shuhua. Application In Synthesis of 4-Cyanopyridine. The article was titled 《Perfluoroalkylative pyridylation of alkenes via 4-cyanopyridine-boryl radicals》. The information in the text is summarized as follows:

A metal-free and photo-free method for the perfluoroalkylative pyridylation of alkenes R1R2C=CH2 [R1 = 4-MeC6H4, 2H-1,3-benzodioxol-5-yl, naphthalen-2-yl, etc.; R2 = H, Me, Et, Pr; R1R2 = -(CH2)5-] has been developed via a combination of computational and exptl. studies. D. functional theory calculations and control experiments indicate that the homolysis of R3X [R3 = CF3, CF2CF2Cl, CF(CF3)2, etc.; X = Br, I] bonds by the 4-cyanopyridine-boryl radicals in situ generated from 4-cyanopyridine and B2pin2 is the key step. Sequential addition of R3 radicals to alkenes and the selective cross-coupling of the resulting alkyl radicals and 4-cyanopyridine-boryl radicals gives alkene difunctionalization products I with a quaternary carbon center. This method exhibits a broad substrate scope and good functional group compatibility. In the part of experimental materials, we found many familiar compounds, such as 4-Cyanopyridine(cas: 100-48-1Application In Synthesis of 4-Cyanopyridine)

4-Cyanopyridine(cas: 100-48-1) belongs to pyridine. In industry and in the lab, pyridine is used as a reaction solvent, particularly when its basicity is useful, and as a starting material for synthesizing some herbicides, fungicides, and antiseptics.Application In Synthesis of 4-Cyanopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Quality Control of Pyridin-3-ylboronic acidIn 2020 ,《Sequential C-S and S-N Coupling Approach to Sulfonamides》 was published in Organic Letters. The article was written by Chen, Kai; Chen, Wei; Han, Bing; Chen, Wanzhi; Liu, Miaochang; Wu, Huayue. The article contains the following contents:

A one-pot three-component reaction involving nitroarenes, (hetero)arylboronic acids, and potassium pyrosulfite leading to sulfonamides RNHS(O)2R1 [R = Ph, 3-pyridyl, 1-naphthyl, etc.; R1 = Ph, 2-thienyl, 2-naphthyl, etc.] was described. A broad range of sulfonamides bearing different reactive functional groups were obtained in good to excellent yields through sequential C-S and S-N coupling that does not require metal catalysts. In the experiment, the researchers used Pyridin-3-ylboronic acid(cas: 1692-25-7Quality Control of Pyridin-3-ylboronic acid)

Pyridin-3-ylboronic acid(cas: 1692-25-7) 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. Quality Control of Pyridin-3-ylboronic acid

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

HPLC of Formula: 1134-35-6In 2020 ,《Effect of fluoro-substituted acceptor-based ancillary ligands on the photocurrent and photovoltage in dye-sensitized solar cells》 was published in Solar Energy. The article was written by Ashraf, Saba; Su, Rui; Akhtar, Javeed; Siddiqi, Humaira M.; Shuja, Ahmed; El-Shafei, Ahmed. The article contains the following contents:

Herein, we report four novel heteroleptic ruthenium (II) complexes, namely SD-7 to SD-10, containing fluoro- and trifluoro- Me antennas as substituents on the ancillary ligands for dye-sensitized solar cells, and were compared to the benchmark dye N719. Photosensitizers (dyes) SD-7 to SD-10 were synthesized according to a typical one-pot three-step procedure with the corresponding ancillary ligands (LS-7 to LS-10). All the dyes were characterized by ATR-FTIR, 1H NMR and mass spectrometry. Furthermore, the photophys., electrochem. and photovoltaic performances were compared with N719. The band gaps, ground and excited state oxidation potentials were measured. The photovoltaic performance of the dyes showed that SD-7 with five fluorine atoms and SD-8 with -CF3 at the -ortho position of the Ph moiety outperformed the benchmark dye N719 with the efficiencies of 8.03% and 8.17%, resp., with c.d. of 19.57 and 19.46 mA•cm-2, resp., and open-circuit voltages of 0.65 V and 0.69 V, resp., under optimized conditions. The fabricated solar devices at lab-scale showed a systematic trend of decreasing JSC when the fluoro-substituted dyes were sensitized on TiO2: SD-7 (with five -F) > SD-8 (with one -CF3 at ortho position) > SD-9 (with one -CF3 at para position) > SD-10 (with two -CF3, one at ortho and one at para position). This can be attributed to the greater number of fluorine atoms directly attached to sp2 hybridized carbon atoms, which greatly enhanced the dipole moment and intimate electronic coupling of SD-7 with TiO2 nanoparticles leading to better photocurrent d. In the experiment, the researchers used 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6HPLC of Formula: 1134-35-6)

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

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Electric Literature of C6H4N2In 2019 ,《Lewis Acid-Catalyzed Selective Reductive Decarboxylative Pyridylation of N-Hydroxyphthalimide Esters: Synthesis of Congested Pyridine-Substituted Quaternary Carbons》 appeared in ACS Catalysis. The author of the article were Gao, Liuzhou; Wang, Guoqiang; Cao, Jia; Chen, Hui; Gu, Yuming; Liu, Xueting; Cheng, Xu; Ma, Jing; Li, Shuhua. The article conveys some information:

A practical and efficient Lewis acid-catalyzed radical-radical coupling reaction of N-hydroxyphthalimide esters and 4-cyanopyridines with inexpensive bis(pinacolato)diboron as reductant has been developed. With ZnCl2 as the catalyst, a wide range of quaternary 4-substituted pyridines, including highly congested diarylmethyl and triarylmethyl substituents, could be selectively obtained in moderate to good yields with broad functional group tolerance. Combined theor. calculations and exptl. studies indicate that the Lewis acid could coordinate with the cyano group of the pyridine-boryl radical to lower the activation barrier of the C-C coupling pathway, leading to the formation of 4-substituted pyridines. Moreover, it could also facilitate the decyanation/aromatization of the radical-radical coupling intermediate. After reading the article, we found that the author used 4-Cyanopyridine(cas: 100-48-1Electric Literature of C6H4N2)

4-Cyanopyridine(cas: 100-48-1) belongs to pyridine. Pyridine and pyridine-derived structures are privileged pharmacophores in medicinal chemistry and an essential functionality for organic chemists. As the prototypical π-deficient heterocycle, pyridine illustrates distinctive chemistry as both substrate and reagent. Electric Literature of C6H4N2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Safety of 4-CyanopyridineIn 2019 ,《Nitrogen-Doped Carbon-Supported Nickel Nanoparticles: A Robust Catalyst to Bridge the Hydrogenation of Nitriles and the Reductive Amination of Carbonyl Compounds for the Synthesis of Primary Amines》 appeared in ChemSusChem. The author of the article were Zhang, Yangmin; Yang, Hanmin; Chi, Quan; Zhang, Zehui. The article conveys some information:

An efficient method was developed for the synthesis of primary amines either from the hydrogenation of nitriles or reductive amination of carbonyl compounds The reactions were catalyzed by nitrogen-doped mesoporous carbon (MC)-supported nickel nanoparticles (abbreviated as MC/Ni). The MC/Ni catalyst demonstrated high catalytic activity for the hydrogenation of nitriles into primary amines in high yields (81.9-99 %) under mild reaction conditions (80° and 2.5 bar H2). The MC/Ni catalyst also promoted the reductive amination of carbonyl compounds for the synthesis of primary amines at 80° and 1 bar H2. The hydrogenation of nitriles and the reductive amination proceeded through the same intermediates for the generation of the primary amines. To the best of knowledge, no other heterogeneous non-noble metal catalysts have been reported for the synthesis of primary amines under mild conditions, both from the hydrogenation of nitriles and reductive amination. In addition to this study using 4-Cyanopyridine, there are many other studies that have used 4-Cyanopyridine(cas: 100-48-1Safety of 4-Cyanopyridine) 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.Safety of 4-Cyanopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Safety of 4-AcetylpyridineIn 2021 ,《Chiral Iron(II)-Catalysts within Valinol-Grafted Metal-Organic Frameworks for Enantioselective Reduction of Ketones》 appeared in ACS Catalysis. The author of the article were Antil, Neha; Akhtar, Naved; Newar, Rajashree; Begum, Wahida; Kumar, Ajay; Chauhan, Manav; Manna, Kuntal. The article conveys some information:

The development of highly efficient and enantioselective heterogeneous catalysts based on earth-abundant elements and inexpensive chiral ligands is essential for environment-friendly and economical production of optically active compounds The authors report a strategy of synthesizing chiral amino alc.-functionalized metal-organic frameworks (MOFs) to afford highly enantioselective single-site base-metal catalysts for asym. organic transformations. The chiral MOFs (vol-UiO) were prepared by grafting of chiral amino alc. such as L-valinol within the pores of aldehyde-functionalized UiO-MOFs via formation of imine linkages. The metalation of vol-UiO with FeCl2 in THF gives amino alc. coordinated octahedral FeII species of vol-FeCl(THF)3 within the MOFs as determined by x-ray absorption spectroscopy. Upon activation with LiCH2SiMe3, vol-UiO-Fe catalyzed hydrosilylation and hydroboration of a range of aliphatic and aromatic carbonyls to afford the corresponding chiral alcs. with enantiomeric excesses up to 99%. Vol-UiO-Fe catalysts have high turnover numbers of up to 15,000 and could be reused at least 10 times without any loss of activity and enantioselectivity. The spectroscopic, kinetic, and computational studies suggest iron-hydride as the catalytic species, which undergoes enantioselective 1,2-insertion of carbonyl to give an iron-alkoxide intermediate. The subsequent σ-bond metathesis between Fe-O bond and Si-H bond of silane produces chiral silyl ether. This work highlights the importance of MOFs as the tunable mol. material for designing chiral solid catalysts based on inexpensive natural feedstocks such as chiral amino acids and base-metals for asym. organic transformations. In the experiment, the researchers used 4-Acetylpyridine(cas: 1122-54-9Safety of 4-Acetylpyridine)

4-Acetylpyridine(cas: 1122-54-9) belongs to pyridine. Pyridine derivatives lend themselves to many roles in the spirited field of supramolecular chemistry – whether as the ligand backbone of metal-organic polymers or presiding over the key electronic stations of nanodevices. In biochemistry, pyridine-containing cofactors are necessary nutrients on which our lives depend. Safety of 4-Acetylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Formula: C12H13N3In 2021 ,《Electronic effects on polypyridyl Co complex-based water reduction catalysts》 appeared in RSC Advances. The author of the article were Guo, Xusheng; Li, Chao; Wang, Weibo; Zhang, Baowen; Hou, Yuanjun; Wang, Xuesong; Zhou, Qianxiong. The article conveys some information:

Three new isomeric cobalt complexes of TPA (tris(2-pyridylmethyl)amine) based on methoxy substitution at the ortho, meta and para positions, resp., were constructed and their photocatalytic proton reduction efficiencies were compared. It was found that there are good linear correlations with the Hammett constants of the substituents for the computed Co-N bond lengths, redox potentials of CoII/I and CoI/0 events, and the photocatalytic activities of the complexes. The ortho-substituted Co complex distinguished itself from the others remarkably in all these comparisons, demonstrating the presence of a steric effect besides the electronic effect. For other examined complexes, a stronger electron-donating substituent may lead to a higher hydrogen evolution efficiency, suggesting that the formation of a Co(III) hydride intermediate is the rate-limiting step. In the part of experimental materials, we found many familiar compounds, such as Bis(pyridin-2-ylmethyl)amine(cas: 1539-42-0Formula: C12H13N3)

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.Formula: C12H13N3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem