Category: pyridine-derivatives

Electric Literature of C5H5BrN2In 2021 ,《Modular Approach to Substituted Pyridoazepinones》 appeared in Organic Letters. The author of the article were Dorokhov, Valentin S.; Zard, Samir Z.. The article conveys some information:

Pyridoazepinones are potentially interesting structures, yet they are still underexploited in the medicinal chem. field and hard to obtain synthetically. Here, a general and flexible synthetic route to substituted pyridoazepinones, enabled by the xanthate addition-transfer process, which furnishes the target mols. from readily available starting materials in generally good yields is presented. The method shows good functional group tolerance and allows the preparation of pyridoazepinone scaffolds on gram scale. After reading the article, we found that the author used 6-Bromopyridin-3-amine(cas: 13534-97-9Electric Literature of C5H5BrN2)

6-Bromopyridin-3-amine(cas: 13534-97-9) belongs to anime. Amine, any member of a family of nitrogen-containing organic compounds that is derived, either in principle or in practice, from ammonia (NH3). Naturally occurring amines include the alkaloids, which are present in certain plants; the catecholamine neurotransmitters (i.e., dopamine, epinephrine, and norepinephrine); and a local chemical mediator, histamine, that occurs in most animal tissues.Electric Literature of C5H5BrN2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Application of 1122-54-9In 2019 ,《The positional isomeric effects induced various phosphorescence: Switchable properties through acid-base vapor stimulation》 appeared in Journal of Molecular Structure. The author of the article were Li, Bin; Yong, Guoping. The article conveys some information:

Three novel positional isomers, namely (E)-3-(2-chloroimidazo[1,2-a]pyridin-3-yl)-1-(pyridin-2-yl)prop-2-en-1-one , (E)-3-(2-chloroimidazo[1,2-a]pyridin-3-yl)-1-(pyridin-3-yl)prop-2-en-1-one and (E)-3-(2-chloroimidazo[1,2-a]pyridin-3-yl)-1-(pyridin-4-yl)prop-2-en-1-one, were obtained through a mild approach. Powder x-ray diffraction patterns demonstrate their various stacking structures, attributed to positional isomeric effects. Furthermore, these positional isomers exhibit different phosphorescent colors and quantum yields. These positional isomers also reveal reversible phosphorescent color switching in the response to acid-base vapor stimuli. The present work provides a promising approach for synthesizing organic materials and a new access to develop dynamic functional materials which can be reversibly switched between different phosphorescence based on external acid-base vapor stimuli. In the part of experimental materials, we found many familiar compounds, such as 4-Acetylpyridine(cas: 1122-54-9Application of 1122-54-9)

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. Application of 1122-54-9

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Category: pyridine-derivativesIn 2019 ,《Mechanistic insights on the non-innocent role of electron donors: reversible photocapture of CO2 by RuII-polypyridyl complexes》 appeared in Dalton Transactions. The author of the article were Queyriaux, Nicolas; Swords, Wesley B.; Agarwala, Hemlata; Johnson, Ben A.; Ott, Sascha; Hammarstroem, Leif. The article conveys some information:

The ability of [RuII(tButpy)(dmbpy)(MeCN)]2+ (1-MeCN) to capture CO2, with the assistance of triethanolamine (TEOA), has been assessed under photocatalytically-relevant conditions. The photolability of 1-MeCN has proven essential to generate a series of intermediates which only differ by the nature of their monodentate ligand. In DMF, ligand photoexchange of 1-MeCN to give [RuII(tButpy)(dmbpy)(DMF)]2+ (1-DMF) proceeds smoothly with a quantum yield of 0.011. However, in the presence of TEOA, this process was disrupted, leading to the formation of a mixture of 1-DMF and [RuII(tButpy)(dmbpy)(TEOA)]+ (1-TEOA). An equilibrium constant of 3 was determined Interestingly, 1-TEOA demonstrated an ability to reversibly catch and release CO2 making it a potentially crucial intermediate towards CO2 reduction4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Category: pyridine-derivatives) was used in this study.

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.Category: pyridine-derivatives 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

Reference of 2,5-DibromopyridineIn 2021 ,《Ultrahigh thermal-stability polyimides with low CTE and required flexibility by formation of hydrogen bonds between poly(amic acid)s》 appeared in European Polymer Journal. The author of the article were Yang, Zhenghui; Ma, Pingchuan; Li, Furong; Guo, Haiquan; Kang, Chuanqing; Gao, Lianxun. The article conveys some information:

The flexibility of organic light-emitting diode (OLED) displays highly depends on the properties of the flexible substrates. In this paper, a series of aromatic polyimides have been fabricated via the copolycondensation of pyromellitic dianhydride (PMDA), the two different rigid heterocyclic diamines, 2,5-bis(4-aminophenyl)pyrimidine (PRM) or 2,5-bis(4-aminophenyl)pyridine (PRD), and another flexible diamine, 4,4′-oxydianiline (ODA). The performance of the polyimide films could be systematically tailored by means of adjusting the main-chain rigidity, as well as the close packing and orientation of polymer chains by the formation of the intermol. hydrogen bonds between poly(amic acid)s. The optimal results (PIb-4, PIb-5, PIc-2) showed that the polyimides were endowed with ultra-high glass transition temperature (Tg) exceeding 450°C, low coefficient of thermal expansion (CTE) at 0-5 ppm K-1 and excellent thermal stability (Td5% = 570-590°C). Meanwhile, all of them exhibited sufficient flexibility, the elongation at break at of 40-60%, extremely high tensile strength of 250-380 MPa and modulus of 4.1-6.1 GPa. Hence, the polyimide films should be the promising candidates for application as the polymer substrates for flexible OLED displays. In the part of experimental materials, we found many familiar compounds, such as 2,5-Dibromopyridine(cas: 624-28-2Reference of 2,5-Dibromopyridine)

2,5-Dibromopyridine(cas: 624-28-2) 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. Reference of 2,5-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

In 2022,Yi, Chih-Lun; Lin, Chun-Yen; Tang, Yukun; Wang, Chun-Yu; Huang, Chih-Wei; Gong, Xu; Gong, Shaolong; Wu, Chung-Chih; Wong, Ken-Tsung published an article in Advanced Optical Materials. The title of the article was 《A Rational Molecular Design Strategy of TADF Emitter for Achieving Device Efficiency Exceeding 36%》.Category: pyridine-derivatives The author mentioned the following in the article:

An excellent thermally activated delayed fluorescence (TADF) emitter requires a sophisticated mol. design strategy to incorporate structural features to simultaneously achieve high photoluminescence quantum yield (PLQY) and high horizontal emission dipole ratio (Θ//). This work reports the uses of heteroarenes and dicarbonitrile benzenes to design four new acceptors PymCN, PyoCN, PmmCN, and PmoCN, which are linked to a common donor dimethylacridine (DMAC) for making new TADF emitters. The emission wavelength, ΔEST, krisc, kr, and the resulting PLQY of the target TADF emitters are governed by the combined natures of the heteroaryl bridges (Py vs Pm) and the CN-substituted patterns (o-CN vs m-CN). The photophys. and device characteristics reveal the best acceptor to be PyoCN, which is further coupled with spiroacridine to afford a new emitter SpiroAC-PyoCN with an enhanced PLQY of 100% compared to that (91%) of the DMAC-based counterpart DMAC-PyoCN. Furthermore, linking PyoCN with spiro-bisacridine (SBAC) gives an A-D-A-configured TADF emitter SBAC-PyoCN with both enhanced PLQY (100%) and Θ// (90%). The device employing SBAC-PyoCN as emitter renders a maximum external quantum efficiency up to 36.1% owing to its unity PLQY and superior light out-coupling efficiency. This rational mol. design strategy provides a feasible means to achieve an excellent TADF emitter design. In the experimental materials used by the author, we found 2,5-Dibromopyridine(cas: 624-28-2Category: pyridine-derivatives)

2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. When pyridine is adsorbed on oxide surfaces or in porous materials, the following species are commonly observed: (i) pyridine coordinated to Lewis acid sites, (ii) pyridine H-bonded to weakly acidic hydroxyls, and (iii) protonated pyridine. At high coverage, physisorbed pyridine and protonated dimers can also be observed.Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Weilhard, Andreas; Argent, Stephen P.; Sans, Victor published an article in 2021. The article was titled 《Efficient carbon dioxide hydrogenation to formic acid with buffering ionic liquids》, and you may find the article in Nature Communications.Quality Control of 2,6-Dibromopyridine The information in the text is summarized as follows:

The efficient transformation of CO2 into chems. and fuels is a key challenge for the decarbonisation of the synthetic production chain. Formic acid (FA) represents the first product of CO2 hydrogenation and can be a precursor of higher added value products or employed as a hydrogen storage vector. Bases are typically required to overcome thermodn. barriers in the synthesis of FA, generating waste and requiring post-processing of the formate salts. The employment of buffers can overcome these limitations, but their catalytic performance has so far been modest. Here, we present a methodol. utilizing IL as buffers to catalytically transform CO2 into FA with very high efficiency and comparable performance to the base-assisted systems. The combination of multifunctional basic ionic liquids and catalyst design enables the synthesis of FA with very high catalytic efficiency in TONs of >8*105 and TOFs > 2.1*104 h-1.2,6-Dibromopyridine(cas: 626-05-1Quality Control of 2,6-Dibromopyridine) was used in this study.

2,6-Dibromopyridine(cas: 626-05-1) 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.Quality Control of 2,6-Dibromopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Eremina, J. A.; Lider, E. V.; Kuratieva, N. V.; Samsonenko, D. G.; Klyushova, L. S.; Sheven’, D. G.; Trifonov, R. E.; Ostrovskii, V. A. published their research in Inorganica Chimica Acta in 2021. The article was titled 《Synthesis and crystal structures of cytotoxic mixed-ligand copper(II) complexes with alkyl tetrazole and polypyridine derivatives》.Category: pyridine-derivatives The article contains the following contents:

A series of mixed-ligand copper(II) complexes {[Cu(phen)(L1)2]·H2O}n (1), [Cu(dmphen)(L1)2] (2), [Cu(bipy)(L1)2] (3) and [Cu2(dmbipy)2(L1)4] (4), where HL1 – 5-methyltetrazole, bipy – 2,2′-bipyridine, dmbipy – 4,4′-dimethyl-2,2′-bipyridine, phen – 1,10-phenanthroline, dmphen – 4,7-dimethyl-1,10-phenanthroline, has been synthesized. The complexes have been characterized by elemental anal., IR spectroscopy and powder x-ray diffraction. Crystal structures of some complexes have been determined by single-crystal x-ray diffraction anal. and showed distorted tetragonal-pyramidal (1) and square pyramidal ([Cu2(bipy)2(L1)4]·DMSO and 4) geometries. The crystal structure of {(H3O)0.5[Cu(phen)(μ3-H2L2)0.5(μ3-HL2)0.5]·H2O}n (5) with alkyl tetrazole H4L2 (1,3,3,5-tetra-(1H-tetrazol-5-yl)-pentane) has also been determined The complexes 1 and 5 have a zig-zag polymeric structure in which each copper(II) ion is coordinated by five N atoms, belonging to three different tetrazolate rings and one 1,10-phenantroline ligand, while [Cu2(bipy)2(L1)4]·DMSO and 4 are binuclear complexes. The effect of the compounds on viability of MCF-7 and Hep-2 cell lines has been investigated. Complexes 1, 2, 4 possess significant dose-dependent cytotoxic effect and 1, 2 are the most cytotoxic. In addition, stability of copper(II) complexes 1-4 in water-ethanol solution and phosphate buffer saline has been investigated by UV-vis spectroscopy. The interaction of complexes 1 and 3 with calf thymus DNA (CT-DNA) has also been studied by UV-vis spectroscopy. The results came from multiple reactions, including the reaction of 4,4′-Dimethyl-2,2′-bipyridine(cas: 1134-35-6Category: pyridine-derivatives)

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.Category: pyridine-derivatives 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

《Comparative dielectric parameters and conductivity mechanisms of pyridine-based rod-like liquid crystals》 was written by Yilmaz Canli, Nimet; Ocak, Hale; Okutan, Mustafa; Karanlik, Gurkan; Bilgin Eran, Belkiz. Application of 29682-15-3 And the article was included in Phase Transitions in 2020. The article conveys some information:

In this study, the dielec. properties and ac conductivity mechanism of pyridine-based rod-like liquid crystals (LC1 and LC2), which show enantiotropic smectic A mesophase, have been investigated by impedance spectroscopy within the frequency interval of 1 kHz-2 MHz. The variation of real and imaginary component of dielec. constant with angular frequency has been investigated. The temperature-dependent absorption coefficient α, relaxation time τo, dielec. strength value Δε, temperature-dependent changes on crystal, SmA and Iso phases have been given. These values were obtained by fitting the exptl. results in ε’-ω graph with the Cole-Cole equation real equation and Origin Pro Graph program. The frequency dependence of ac conductivities has also been analyzed. Different conductivity mechanisms, i.e. dc conductivity, correlated barrier hoping and quantum mech. tunneling behaviors have been determined for different frequency regions. In the experimental materials used by the author, we found Methyl 5-bromopicolinate(cas: 29682-15-3Application of 29682-15-3)

Methyl 5-bromopicolinate(cas: 29682-15-3) 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 of 29682-15-3

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Stevens, Matthew P.; Spray, Emily; Vitorica-Yrezabal, Inigo J.; Singh, Kuldip; Timmermann, Vanessa M.; Sotorrios, Lia; Macgregor, Stuart A.; Ortu, Fabrizio published an article in 2022. The article was titled 《Synthesis, characterisation and reactivity of group 2 complexes with a thiopyridyl scorpionate ligand》, and you may find the article in Dalton Transactions.Computed Properties of C7H5N The information in the text is summarized as follows:

Herein we report the reactivity of the proligand tris(2-pyridylthio)methane (HTptm) with various Alk. Earth (AE) reagents: (1) dialkylmagnesium reagents and (2) AE bis-amides (AE = Mg-Ba). Heteroleptic complexes of general formulas [Mg(Tptm)(R)] (R = Me, Bu) and [AE(Tptm)(NR2)] (AE = Mg-Ba; R = SiMe3) were targeted from the reaction of HTptm with R2Mg or [AE(NR2)2]2. Reaction of the proligand with dialkylmagnesium reagents led to formation of [{Mg(κ3C,N,N-CBu{S-C5H4N}2)(μ-S-C5H4N)}2] (1) and [{Mg(κ3C,N,N-CMe{S-C5H4N}2)(μ-OSiMe3)}2] (2) resp., as a result of a novel transfer of an alkyl group onto the methanide carbon with concomitant C-S bond cleavage. However, reactivity of bis-amide precursors for Mg and Ca did afford the target species [AE(Tptm)(NR2)] (3-AE; AE = Mg-Ca), although these proved susceptible to ligand degradation processes. DFT calculations show that alkyl transfer in the putative [Mg(Tptm)(Bu)] (1m’) system and amide transfer in 3-Ca is a facile process that induces C-S bond cleavage in the Tptm ligand. The complexes 3-Mg and 3-Ca were also tested as catalysts for the hydrophosphination of selected alkenes and alkynes, including the first example of mono-hydrophosphination of 4-ethynylpyridine which was achieved with high conversions and excellent regio- and stereochem. control. The experimental process involved the reaction of 4-Ethynylpyridine(cas: 2510-22-7Computed Properties of C7H5N)

4-Ethynylpyridine(cas: 2510-22-7) 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.Computed Properties of C7H5N

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Zhou, Su; Li, Rui; Zhang, Zhichao; Gu, Minyang; Zhu, Hongyan; Fang, Jing; Ji, Zhiwen; Xu, Xiaodong; Tang, Liming published an article in 2021. The article was titled 《Analysis of mutagenic components of oxidative hair dyes with the Ames test》, and you may find the article in Human & Experimental Toxicology.Application In Synthesis of 2,6-Diaminopyridine The information in the text is summarized as follows:

Oxidative hair dyes consist of two components (I and II) that are mixed before use. Aromatic amines in component I and their reaction with hydrogen peroxide after mixing them with component II have been of primary concern. In addition, two in vitro genotoxicity assays are still required for the approval of the final products of oxidative hair dyes in China, and the substance in the oxidative hair dye that causes the high rate of pos. results in genotoxicity tests, especially the Ames test, has not been fully elucidated. In this study, we analyzed the formulation of 55 different oxidative hair dyes from 7 color series and performed Ames tests in the strain TA98 with the S9 mix (oxidative hair dyes Number 1-30) and in strain TA97a without the S9 mix (oxidative hair dyes Number 31-55). We found that toluene-2,5-diamine sulfate (2,5-diaminotoluene sulfate, DATS) in component I may be the cause of mutagenicity in TA98, and hydrogen peroxide in component II may be the cause of mutagenicity in TA97a, and their pos. concentrations were consistent with those that we calculated from Ames tests. The results suggest that the pos. results for the oxidative hair dye in the Ames test were inevitable because of the existence of DATS in component I and of hydrogen peroxide in component II. Therefore, we should carry out safety assessments on each raw material and carry out risk assessments on the final products of oxidative hair dyes instead of genotoxicity tests in China. In the experimental materials used by the author, we found 2,6-Diaminopyridine(cas: 141-86-6Application In Synthesis of 2,6-Diaminopyridine)

2,6-Diaminopyridine(cas: 141-86-6) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.Application In Synthesis of 2,6-Diaminopyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem