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In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Stand-alone CdS nanocrystals for photocatalytic CO2 reduction with high efficiency and selectivity, published in 2021-06-09, which mentions a compound: 4556-23-4, Name is Pyridine-4-thiol, Molecular C5H5NS, Application of 4556-23-4.

The development of a cost-effective photocatalyst is highly anticipated to achieve efficient photocatalytic CO2 reduction with superior selectivity, which is still facing the lack of valid settlements. Herein, 4-mercaptopyridine (PD) as the building block of a capping ligand is tightly decorated on the surface of CdS nanocrystals (CdS-PD) using a facile ligand-exchange strategy, to exploit a cost-effective photocatalyst for photocatalytic CO2 reduction without any cocatalysts. The conjugated structure of PD can facilitate the delocalization of photogenerated electrons in CdS nanocrystals, bringing forth an improved charge separation efficiency. More importantly, N-protonated PD can enable the easy formation of a six-membered ring intermediate with CO2 assisted by water, which can serve as the efficient active site to achieve photocatalytic CO2 reduction In the absence of a cocatalyst, stand-alone CdS-PD nanocrystals exhibit an excellent CO yield of 20.35 mmol g-1 h-1 concomitant with a high selectivity of 95.3% for the CO2-to-CO conversion under visible light, which are remarkably superior than those of CdS nanocrystals possessing traditional alkyl-chain and other conjugated capping ligands.

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Electric Literature of C4H4ClN3O2. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 5-Chloro-1-methyl-4-nitroimidazole, is researched, Molecular C4H4ClN3O2, CAS is 4897-25-0, about Research in the imidazole series. 96. Reaction of 1-methyl-4-nitro-5-chloroimidazole with phenols, naphthols, and 8-hydroxyquinoline. Author is Reznichenko, L. A.; Gireva, R. N.; Kochergin, P. M.; Aleksandrova, E. V..

By reactions of 1-methyl-4-nitro-5-chloroimidazole with 4-nitrophenol, α- and β-naphthols, and 8-hydroxyquinoline, a number of 1-methyl-4-nitro-5-[aryl(or heteroaryl)oxy]imidazoles have been obtained. With aminophenols under analogous conditions, 1-methyl-4-nitro-5-[(hydroxyphenyl)amino]imidazoles have been obtained.

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Related Products of 4897-25-0. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 5-Chloro-1-methyl-4-nitroimidazole, is researched, Molecular C4H4ClN3O2, CAS is 4897-25-0, about The kinetics of the reaction of ‘anomalous’ 4-nitroimidazole radiosensitizers with thiols. Author is Wardman, P..

Kinetic data for the nonenzymic conjugation of GSH  [70-18-8] and dithiothreitol  [3483-12-3] with the radiosensitizers, 5-chloro-1-methyl-4-nitroimidazole  [4897-25-0] and Ro 31-0750  [13755-79-8], provided upper limits for the half-lives of these compounds when administered in vivo, and suggest that thiol depletion by such compounds in vitro is probably accelerated by glutathione S-transferases. The substantial enhancement of radiosensitization caused by nonprotein thiol depletion may be restricted to dilute cell suspensions in vitro since depletion of a significant proportion of nonprotein thiol in vivo seems unlikely at realistic dose regimes in man.

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Application of 4556-23-4. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about Molecular-Scale Chemical Imaging of the Orientation of an On-Surface Coordination Complex by Tip-Enhanced Raman Spectroscopy. Author is Cai, Zhen-Feng; Zheng, Li-Qing; Zhang, Yao; Zenobi, Renato.

Metal-organic coordination structures at interfaces play an essential role in many biol. and chem. systems. Understanding the mol. specificity, orientation, and spatial distribution of the coordination complexes at the nanometer scale is of great importance for effective mol. engineering of nanostructures and fabrication of functional devices with controllable properties. However, fundamental properties of such coordination systems are still rarely studied directly. In this work, we present a spectroscopic approach on the basis of tip-enhanced Raman spectroscopy (TERS) to investigate cobalt(II) tetraphenyl-porphyrine coordination species on the scale of a single mol. under ambient conditions. Coordination species anchored on gold surfaces modified with pyridine thiol self-assembled monolayers can be spectroscopically distinguished and mapped with ca. 2 nm resolution In addition, in combination with d. functional theory simulations, the adsorption configuration and mol. orientation of the coordination complexes are also revealed using TERS imaging.

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Formula: C4H4ClN3O2. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 5-Chloro-1-methyl-4-nitroimidazole, is researched, Molecular C4H4ClN3O2, CAS is 4897-25-0, about Metabolic fate of the methylnitroimidazole moiety of azathioprine in the rat. Author is De Miranda, Paulo; Beacham, Lowrie M. III; Creagh, Teresa H.; Elion, Gertrude B..

The major unbound radioactive metabolite of 14C-labeled azathioprine (I) [446-86-6], labeled on the methylnitroamidazole ring, in rat liver homogenates, was 1-methyl-4-nitro-5-(S-glutathionyl)imidazole [36892-55-4] while .sim.10% of the radioactivity was bound to protein. The major urinary metabolite was 1-methyl-4-nitro-5-(N-acetyl-S-cysteinyl)imidazole [51052-82-5], which was a biotransformation product of the glutathionyl imidazole. The metabolite was also isolated from rat liver perfusates by incubation of I with blood and in vivo in the blood, but not in the urine, of rats given I. The various modes of splitting of I and of the formation of 1-methyl-4-nitro-5-thiomidazole [6339-54-4] are discussed and a pathway for the metabolic alteration of I into its principal methylnitroimidazole metabolites in the rat was proposed.

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COA of Formula: C4H4ClN3O2. The reaction of aromatic heterocyclic molecules with protons is called protonation. Aromatic heterocycles are more basic than benzene due to the participation of heteroatoms. Compound: 5-Chloro-1-methyl-4-nitroimidazole, is researched, Molecular C4H4ClN3O2, CAS is 4897-25-0, about Kinetic studies of the photodegradation of nitroimidazole derivatives in the solid state. Author is Marciniec, Barbara; Bugaj, A.; Kedziora, W..

The kinetics of the photodegradation of 7 nitroimidazoles including the chemotherapeutics metronidazole, ornidazole, and tinidazole were determined in the solid state by a direct method from the IR spectra using the “”alkali-halide matrix”” technique. The photochem. decomposition of nitroimidazole in the solid state proceeds according to a first-order reaction. An order of photochem. stability of nitromidazole derivatives in the solid state. is suggested using the calculated kinetic parameters. The photochem. stability of the studied compounds is affected by the substituents at position N(1) and C(5) of the nitroimidazole ring.

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Application of 4556-23-4. Aromatic heterocyclic compounds can also be classified according to the number of heteroatoms contained in the heterocycle: single heteroatom, two heteroatoms, three heteroatoms and four heteroatoms. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about Etchable SERS nanosensor for accurate pH and hydrogen peroxide sensing in living cells. Author is Bai, Lu; Wang, Xiaojie; Zhang, Kaifu; Tan, Xiaoyue; Zhang, Yuying; Xie, Wei.

No methodol. has been built to distinguish intracellular SERS nanosensors from cell outer membrane bound-ones. Here the authors propose a “”turning off”” strategy by combining etchable SERS nanosensors with a non-permeable etchant. The SERS signals outside the living cells can be rapidly removed, leaving only the internalized nanosensors for imaging and thereby allowing accurate intracellular pH and H2O2 sensing.

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Name: Pyridine-4-thiol. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about Ionic cocrystals of dithiobispyridines: the role of I···I halogen bonds in the building of iodine frameworks and the stabilization of crystal structures. Author is Wzgarda-Raj, Kinga; Nawrot, Martyna; Rybarczyk-Pirek, Agnieszka J.; Palusiak, Marcin.

It has been confirmed that mercaptopyridines undergo spontaneous condensation in redox reaction with iodine-forming dithiopyridines. In the solid state, these compounds are protonated at the N atoms and cocrystallize with iodine forming salt structures, namely, 2-[(pyridin-2-yl)disulfanyl]pyridinium triiodide sesquiiodine, C10H9N2S2+·I3-·1.5I2, and 4,4′-(disulfanediyl)dipyridinium pentaiodide triiodide, C10H10N2S22+·I5-·I3-. Dithiopyridine cations are packed among three-dimensional frameworks built from iodide anions and neutral iodine mols., and are linked by hydrogen, halogen and chalcogen interactions. Quantum chem. computations indicated that dithiopyridines exhibit anomalously high nitrogen basicity which qualify them as potential proton sponges.

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Product Details of 4897-25-0. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 5-Chloro-1-methyl-4-nitroimidazole, is researched, Molecular C4H4ClN3O2, CAS is 4897-25-0, about Highly selective solid phase extraction and preconcentration of Azathioprine with nano-sized imprinted polymer based on multivariate optimization and its trace determination in biological and pharmaceutical samples. Author is Davarani, Saied Saeed Hosseiny; Zad, Zeinab Rezayati; Taheri, Ali Reza; Rahmatian, Nasrin.

In this research, for first time selective separation and determination of Azathioprine is demonstrated using molecularly imprinted polymer as the solid-phase extraction adsorbent, measured by spectrophotometry at λmax 286 nm. The selective molecularly imprinted polymer was produced using Azathioprine and methacrylic acid as a template mol. and monomer, resp. A molecularly imprinted solid-phase extraction procedure was performed in column for the analyte from pharmaceutical and serum samples. The synthesized polymers were characterized by IR spectroscopy (IR), field emission SEM (FESEM). In order to investigate the effect of independent variables on the extraction efficiency, the response surface methodol. (RSM) based on Box-Behnken design (BBD) was employed. The anal. parameters such as precision, accuracy and linear working range were also determined in optimal exptl. conditions and the proposed method was applied to anal. of Azathioprine. The linear dynamic range and limits of detection were 2.5-0.01 and 0.008 mg L- 1 resp. The recoveries for analyte were higher than 95% and relative standard deviation values were found to be in the range of 0.83-4.15%. This method was successfully applied for the determination of Azathioprine in biol. and pharmaceutical samples.

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Song, Lijuan; Li, Wenhao; Duan, Wenxue; An, Jichao; Tang, Shanyu; Li, Longjia; Yang, Guanyu published the article 《Natural gallic acid catalyzed aerobic oxidative coupling with the assistance of MnCO3 for synthesis of disulfanes in water》. Keywords: disulfane preparation; thiol oxidative coupling gallic acid organocatalyst.They researched the compound: Pyridine-4-thiol( cas:4556-23-4 ).Category: nitriles-buliding-blocks. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:4556-23-4) here.

To pursue a sustainable approach for such a synthesis, an aerobic oxidative coupling method for the efficient preparation of organic disulfanes RSSR1 [R = 4-MeC6H4, cyclohexyl, 2-thienyl, etc.; R1 = t-Bu, 4-ClC6H4, 4-H2NC6H4, etc.], using a low-toxic natural gallic acid as an organocatalyst, inexpensive MnCO3 as a cocatalyst, O2 as the terminal oxidant and water as the solvent, was successfully developed. Such metal-organic cooperative catalytic protocol provided an access to various sym. and unsym. disulfanes in up to 99% yield. Gram scale synthesis with practical convenience and low loading of catalysts further illustrated the practicability of our method.

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