Month: January 2023

Effect of a cationic surfactant on the volatilization of PAHs from soil was written by Lu, Li;Zhu, Lizhong. And the article was included in Environmental Science and Pollution Research in 2012.Category: pyridine-derivatives This article mentions the following:

Cationic surfactants are common in soils because of their use in daily cosmetic and cleaning products, and their use as a soil amendment for the mitigation and remediation of organic contaminated soils has been proposed. Such surfactant may affect the transfer and fate of organic contaminants in the environment. This study investigated the effect of a cationic surfactant, dodecylpyridinium bromide (DDPB), on the volatilization of polycyclic aromatic hydrocarbons (PAHs) from a paddy soil. The volatilization of PAHs from moist soil amended with different concentrations of DDPB was tested in an open system. The specific effects of DDPB on the liquid-vapor and solid-vapor equilibrium of PAHs were sep. investigated in closed systems by headspace anal. DDPB affects both liquid-vapor and solid-vapor processes of PAHs in soil. At DDPB concentrations below the critical micelle concentration (CMC), movement of PAHs from the bulk solution to the gas-liquid interface appeared to be facilitated by interaction between PAHs and the surfactant monomers adsorbed at the gas-liquid interface, promoting the volatilization of PAHs from solution However, when DDPB was greater than the CMC, volatilization was inhibited due to the solubilization of PAHs by micelles. On the other hand, the formation of sorbed surfactant significantly inhibited the solid-vapor volatilization of PAHs. The overall effect of the two simultaneous effects of DDPB on liquid-vapor and solid-vapor processes was a decreased volatilization loss of PAHs from soil. Inhibition of PAH volatilization was more significant for the soil with a lower moisture content. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Category: pyridine-derivatives).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Nitrogenase-mimic iron-containing chalcogels for photochemical reduction of dinitrogen to ammonia was written by Liu, Jian;Kelley, Matthew S.;Wu, Weiqiang;Banerjee, Abhishek;Douvalis, Alexios P.;Wu, Jinsong;Zhang, Yongbo;Schatz, George C.;Kanatzidis, Mercouri G.. And the article was included in Proceedings of the National Academy of Sciences of the United States of America in 2016.Quality Control of Pyridinehydrochloride This article mentions the following:

A nitrogenase-inspired biomimetic chalcogel system comprising double-cubane [Mo₂Fe₆S₈(SPh)₃] and single-cubane (Fe₄S₄) biomimetic clusters demonstrates photocatalytic N₂ fixation and conversion to NH₃ in ambient temperature and pressure conditions. Replacing the Fe₄S₄ clusters in this system with other inert ions such as Sb³⁺, Sn⁴⁺, Zn²⁺ also gave chalcogels that were photocatalytically active. Finally, molybdenum-free chalcogels containing only Fe₄S₄ clusters are also capable of accomplishing the N₂ fixation reaction with even higher efficiency than their Mo₂Fe₆S₈(SPh)₃-containing counterparts. Results suggest that redox-active iron-sulfide-containing materials can activate the N₂ mol. upon visible light excitation, which can be reduced all of the way to NH₃ using protons and sacrificial electrons in aqueous solution Evidently, whereas the Mo₂Fe₆S₈(SPh)₃ is capable of N₂ fixation, Mo itself is not necessary to carry out this process. The initial binding of N₂ with chalcogels under illumination was observed with in situ diffuse-reflectance FTIR spectroscopy (DRIFTS). ¹⁵N₂ isotope experiments confirm that the generated NH₃ derives from N₂. D. functional theory (DFT) electronic structure calculations suggest that the N₂ binding is thermodynamically favorable only with the highly reduced active clusters. The results reported herein contribute to ongoing efforts of mimicking nitrogenase in fixing nitrogen and point to a promising path in developing catalysts for the reduction of N₂ under ambient conditions. In the experiment, the researchers used many compounds, for example, Pyridinehydrochloride (cas: 628-13-7Quality Control of Pyridinehydrochloride).

Pyridinehydrochloride (cas: 628-13-7) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ·mol−1 in pyridine vs. 150 kJ·mol−1 in benzene). Pyridine derivatives are also useful as small-molecule α-helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.Quality Control of Pyridinehydrochloride

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Mn^II-based MIL-53 Analogues: Synthesis Using Neutral Bridging μ₂-Ligands and Application in Liquid-Phase Adsorption and Separation of C6-C8 Aromatics was written by Xu, Guohai;Zhang, Xiaoguang;Guo, Peng;Pan, Chengling;Zhang, Hongjie;Wang, Cheng. And the article was included in Journal of the American Chemical Society in 2010.Category: pyridine-derivatives This article mentions the following:

Four Mn^II-based MIL-53 single crystals were prepared using four neutral pyridine N-oxides as bridging μ₂-ligands. In the case of 4,4′-bipyridine-N,N’-dioxide (BPNO), the infinite Mn oxide chains were further interconnected by BPNO besides BDC, which allows 1-dimensional channels to be accessible for guest mols. The liquid-phase adsorption and separation of C6-C8 aromatics using the evacuated compound as an absorbent were studied via crystal-to-crystal transformations. Both structural evolution of the compounds and selectivity of C6-C7 aromatics of one evacuated compound could be attributed to noncovalent interactions, especially π-π interaction. In the experiment, the researchers used many compounds, for example, 3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8Category: pyridine-derivatives).

3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8) belongs to pyridine derivatives. In contrast to benzene, Pyridine’s electron density is not evenly distributed over the ring, reflecting the negative inductive effect of the nitrogen atom. Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals.Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Organic Semiconducting Polymer Nanoparticles for Photoacoustic Labeling and Tracking of Stem Cells in the Second Near-Infrared Window was written by Yin, Chao;Wen, Guohua;Liu, Chao;Yang, Boguang;Lin, Sien;Huang, Jiawei;Zhao, Pengchao;Wong, Siu Hong Dexter;Zhang, Kunyu;Chen, Xiaoyu;Li, Gang;Jiang, Xiaohua;Huang, Jianping;Pu, Kanyi;Wang, Lidai;Bian, Liming. And the article was included in ACS Nano in 2018.Electric Literature of C5H6ClN This article mentions the following:

Photoacoustic (PA) imaging and tracking of stem cells plays an important role in the real-time assessment of cell-based therapies. Nevertheless, the limitations of conventional inorganic PA contrast agents and the narrow range of the excitation wavelength in the first near-IR (NIR-I) window hamper the applications of PA imaging in living subjects. Herein, we report the design and synthesis of a second near-IR (NIR-II) absorptive organic semiconducting polymer (OSP)-based nanoprobe (OSPN⁺) for PA imaging and tracking of stem cells. Comparison studies in biol. tissue show that NIR-II light excited PA imaging of the OSPN⁺ has significantly higher signal-to-noise ratio than NIR-I light excited PA imaging, thereby demonstrating the superiority of the OSPN⁺ for deep tissue imaging. With good biocompatibility, appropriate size, and optimized surface property, the OSPN⁺ shows enhanced cellular uptake for highly efficient PA labeling of stem cells. In vivo investigations reveal significant NIR-II PA contrast enhancement of the transplanted OSPN⁺-labeled human mesenchymal stem cells by 40.6- and 21.7-fold in s.c. and brain imaging, resp., compared with unlabeled cases. Our work demonstrates a class of OSP-based nanomaterials for NIR-II PA stem cell imaging to facilitate a better understanding and evaluation of stem cell-based therapies. In the experiment, the researchers used many compounds, for example, Pyridinehydrochloride (cas: 628-13-7Electric Literature of C5H6ClN).

Pyridinehydrochloride (cas: 628-13-7) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ·mol−1 in pyridine vs. 150 kJ·mol−1 in benzene). Several pyridine derivatives play important roles in biological systems. While its biosynthesis is not fully understood, nicotinic acid (vitamin B3) occurs in some bacteria, fungi, and mammals.Electric Literature of C5H6ClN

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Catalytic Asymmetric Hydroalkylation of α,β-Unsaturated Amides Enabled by Regio-Reversed and Enantiodifferentiating syn-Hydronickellation was written by Zhou, Fang;Zhu, Shaolin. And the article was included in ACS Catalysis in 2021.SDS of cas: 24103-75-1 This article mentions the following:

Here, an enantioselective nickel-hydride catalyzed hydroalkylation of readily accessible β-alkyl-α,β-unsaturated amides to form structurally diverse β-chiral amides e.g., I was reported. This process was proposed to proceed through an enantiodifferentiating syn-hydrometalation of nickel hydride, forming chiral alkylnickel at β-position in which regioselectivity is different than that with copper hydride. This regio-reversed hydronickellation process provided a complementary approach to access enantioenriched β-functionalization amides with a stereocenter at β-position. In the experiment, the researchers used many compounds, for example, 4-Methoxy-2-methylpyridine (cas: 24103-75-1SDS of cas: 24103-75-1).

4-Methoxy-2-methylpyridine (cas: 24103-75-1) belongs to pyridine derivatives. Pyridine has a conjugated system of six π electrons that are delocalized over the ring. The molecule is planar and, thus, follows the Hückel criteria for aromatic systems. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. SDS of cas: 24103-75-1

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Selective synthesis of 2-substituted pyridine N-oxides via directed ortho-metalation using Grignard reagents was written by Andersson, Hans;Gustafsson, Magnus;Olsson, Roger;Almqvist, Fredrik. And the article was included in Tetrahedron Letters in 2008.Product Details of 3718-65-8 This article mentions the following:

Addition of i-PrMgCl to pyridine N-oxides in THF at -78 °C generates selectively an ortho-metalated species, which can be trapped with various electrophiles to generate 2-substituted pyridine N-oxides. Furthermore, by applying a double metal-catalyzed cross-coupling, direct arylation of the pyridine N-oxides is achieved. In the experiment, the researchers used many compounds, for example, 3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8Product Details of 3718-65-8).

3,5-Dimethylpyridine 1-oxide (cas: 3718-65-8) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. The lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the σ bonds. Halopyridines are particularly attractive synthetic building blocks in a variety of cross-coupling methods, including the Suzuki-Miyaura cross-coupling reaction.Product Details of 3718-65-8

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Lanthanide (III) complexes of 3-(ethylthio)phenyl-substituted phthalocyanines: Synthesis and physicochemical properties was written by Dubinina, Tatiana V.;Tychinsky, Pavel I.;Borisova, Nataliya E.;Krasovskii, Vitaly I.;Ivanov, Anton S.;Savilov, Serguei V.;Maklakov, Sergey S.;Sedova, Marina V.;Tomilova, Larisa G.. And the article was included in Dyes and Pigments in 2018.Name: Pyridinehydrochloride This article mentions the following:

Novel phthalocyaninates of terbium, erbium and lutetium, bearing 3-(ethylthio)phenyl peripheral groups, were synthesized with high yields. The complexes obtained were characterized by ¹H NMR spectroscopy, FTIR spectroscopy and high-resolution mass spectrometry. Thermal stability of the lanthanide complexes was examined using TGA combined with FTIR spectroscopy. Strong upfield (up to -59.06) and downfield (up to 22.32) lanthanide-induced shifts of signals of aromatic protons were observed in NMR spectra of terbium and erbium complexes, resp. It was shown, that comparing to phenyl-substituted analogs the introduction of ethylthio-moieties in the meta-positions of Ph substituents does not affect the Q band maxima. Hybrid gold nanoparticles coated with mols. of the lutetium complex were obtained and their optical properties were studied. The formation of phthalocyanine shell and its composition were proven using at. force and TEM. Absorption cross sections of ground and the first excited states were calculated using the data of open-aperture z-scan measurements for lutetium complex and hybrid gold nanoparticles on its basis. In the experiment, the researchers used many compounds, for example, Pyridinehydrochloride (cas: 628-13-7Name: Pyridinehydrochloride).

Pyridinehydrochloride (cas: 628-13-7) belongs to pyridine derivatives. Pyridine has a conjugated system of six π electrons that are delocalized over the ring. The molecule is planar and, thus, follows the Hückel criteria for aromatic systems. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C–H in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Name: Pyridinehydrochloride

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Structure of leucenol. III. Synthesis of 2,5-dihydroxypyridine (5-hydroxy-2-pyridone) was written by Adams, Roger;Govindachari, T. R.. And the article was included in Journal of the American Chemical Society in 1947.Computed Properties of C6H7NO2 This article mentions the following:

2-Chloro-5-nitropyridine and MeONa, refluxed 10 min., give 74.5% of the 2-MeO derivative (I), m. 109°. Catalytic reduction of I (Pt oxide) in absolute EtOH at 2-3 atm. pressure gives 95% 2-methoxy-5-aminopyridine (II), b₁₀ 125-6° (monopicrate, yellow, m. 160°; picrate, yellow, m. 128°; the latter seps. 1st from the EtOH solution of the components). II (from 10 g. I), through the diazo reaction, yields 100 mg. 2-methoxy-5-hydroxypyridine, m. 81°; 90 mg. and 1 mL. HBr (d. 1.5), refluxed in a N atm. 4 h., give 70 mg. 2,5-dihydroxypyridine (5-hydroxy-2-pyridone) (III), decompose 240-50°. III is not identical with the pyrolysis product of leucenol, as shown by mixed m.p., color reactions with FeCl₃, and IR absorption spectra. In the experiment, the researchers used many compounds, for example, 5-Hydroxy-2-methoxylpyridine (cas: 51834-97-0Computed Properties of C6H7NO2).

5-Hydroxy-2-methoxylpyridine (cas: 51834-97-0) belongs to pyridine derivatives. In contrast to benzene, Pyridine’s electron density is not evenly distributed over the ring, reflecting the negative inductive effect of the nitrogen atom. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C–H in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Computed Properties of C6H7NO2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Rhodium(I)-catalyzed directed trideuteromethylation of (hetero)arene C-H bonds with CD₃CO₂D was written by Zhao, Haoqiang;Zeng, Qi;Yang, Ji;Xu, Bing;Lei, Haimin;Xu, Lijin;Walsh, Patrick J.. And the article was included in Organic & Biomolecular Chemistry in 2022.Reference of 4373-61-9 This article mentions the following:

A Rh(I)-catalyzed trideuteromethylation of heteroarenes with inexpensive and readily available deuterated acetic acid (CD₃CO₂D) with the aid of a N-containing directing groups is developed. The oxidant-free reaction is applicable to a wide range of heteroarene substrates, including 2-pyridones, indoles, aryl rings, pyrroles and carbazoles. It allows installation of CD₃ groups under straightforward reaction conditions. It is expected that the salient and practical features of this trideuteromethylation protocol will be of use to academic and industrial researchers. In the experiment, the researchers used many compounds, for example, 2-(m-Tolyl)pyridine (cas: 4373-61-9Reference of 4373-61-9).

2-(m-Tolyl)pyridine (cas: 4373-61-9) belongs to pyridine derivatives. Pyridine is diamagnetic and has a diamagnetic susceptibility of −48.7 × 10−6 cm3·mol−1.The molecular electric dipole moment is 2.2 debyes. The standard enthalpy of formation is 100.2 kJ·mol−1 in the liquid phase and 140.4 kJ·mol−1 in the gas phase. Pyridine groups exist in countless molecules, and their applications include catalysis, drug design, molecular recognition, and natural product synthesis.Reference of 4373-61-9

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Three-Point Hydrogen Bonding Assembly between a Conjugated PPV and a Functionalized Fullerene was written by Li, Yuliang;Zhu, Daoben;Xiao, Shengqiang;Liu, Huibiao. And the article was included in PMSE Preprints in 2003.Product Details of 1075-62-3 This article mentions the following:

A uracil-containing polyphenylenevinylene interacted with DAP-C₆₀ containing 2,6-diacylamidopyridine through H bonding to give a supramol. system. Fluorescence quenching experiments indicated a strong interaction between the 2 components (KSV = 5.8 × 10⁴ M^-1). An FESEM image of the system showed that the assembly consisted of particles having mean diameter 75 nm. In the experiment, the researchers used many compounds, for example, N-(6-Aminopyridin-2-yl)acetamide (cas: 1075-62-3Product Details of 1075-62-3).

N-(6-Aminopyridin-2-yl)acetamide (cas: 1075-62-3) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. Product Details of 1075-62-3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem