Tag: M.W=100-200

Product Details of 4556-23-4. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about Surface Plasmon Field-Enhanced Raman Scattering Based on Evanescent Field Excitation of Waveguide-Coupled Surface Plasmon Resonance Configuration.

The authors propose a bimetallic waveguide-coupled surface plasmon resonance (WCSPR) configuration to enhance Raman scattering with an evanescent field excited using surface plasmons. The WCSPR configuration is a 5-phase Kretschmann resonance setup composed of a K9 prism/inner Ag film/MgF2 film/outer Ag film/H2O structure. Incident angle-dependent SERS spectra were measured in the evanescent field on this WCSPR configuration using an inhouse-built angle-dependent SPR-SERS microspectrometer. The SERS signal obtained under evanescent field excitation at the SPR angle was 20× higher than that collected using the conventional SPR configuration. Also the waveguide-coupled surface plasmons in this evanescent field-enhanced SERS spectroscopy setup had elec. field penetration depth of at least 500 nm, which is longer than the penetration depth for conventional surface plasmons. High-quality SERS signals can still be obtained after adding a 500. nm MgF2 film to the WCSPR configuration due to the deeper penetration depth. This advantage makes it possible to use Ag with a stronger elec. field enhancement capability instead of an inert noble metal such as Au in the experiment without worrying about the oxidation of Ag. The enhancement factor of this WCSPR configuration was 6.2 × 107. The lowest detectable concentration for the SERS signal of 4-mercaptopyridine reached 1.0 × 10-10 M using the WCSPR configuration. The WCSPR configuration has great potential for label-free sensing and detection of macromols. and biomols.

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Soorni, Aboozar; Akrami, Amir Mohammad; Abolghasemi, Reza; Vahedi, Maryam published an article about the compound: Pyridine-4-thiol( cas:4556-23-4,SMILESS:SC1=CC=NC=C1 ).HPLC of Formula: 4556-23-4. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:4556-23-4) through the article.

Allium is one of the well-known genera of the Amaryllidaceae family, which contains over 780 species. Onions, garlic, leeks, and shallots are the most important species of this genus. Allium hirtifolium (shallot) is a rich source of proteins, carbohydrates, lipids, amino acids, and bioactive compounds such as organic sulfur compounds with an expansive range of biol. activities and medicinal attributes. To identify the putative compounds and genes involved in the organic sulfur pathway, we applied GC-MS and RNA-seq techniques for the bulb, stem, and flower tissues of A. hirtifolium. The essential oil anal. revealed the maximum amount of sulfur compounds in stem against flower and bulb tissues. Transcriptome profiling showed 6155, 6494, and 4259 DEGs for bulb vs. flower, bulb vs. stem, and flower vs. stem, resp. Overall, more genes were identified as being up-regulated rather than down-regulated in flower tissue compared to the stem and bulb tissues. Our findings in accordance with other results from different papers, suggest that carbohydrates are vital to bulb formation and development because a high number of identified DEGs (586 genes) were mapped to carbohydrate metabolism This study has detected the genes in the organic sulfur pathway and indicated that the alliinase gene shows a high variability among different tissues. In general, this study formed a useful genomic resource data to explore tissue-specific sulfur pathway in A. hirtifolium, which is helpful for functional breeding.

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Recommanded Product: 5-Chloro-1-methyl-4-nitroimidazole. 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 Synthesis of 6-(1-methyl-4-nitro-5-[4,5-14C]-imidazolyl]thiopurine (azathioprine). Author is Yeowell, Heather N.; Elion, Gertrude B..

Steps in the radioactive synthesis are similar to those used in the preparation of unlabeled azathioprine. N,N’-Dimethyloxamide -1,2-14C was cyclized by PCl5 to I (labeled C located by asterisk) which was nitrated to II. Reaction of II with 6-mercaptopurine gave 85% III or 23.7% radioactive product.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Bromo derivatives of 1-methylglyoxaline and the constitution of “”chloroxalmethylin””》. Authors are Balaban, I. E.; Pyman, F. L..The article about the compound:5-Chloro-1-methyl-4-nitroimidazolecas:4897-25-0,SMILESS:C1=NC(=C(Cl)[N]1C)[N+]([O-])=O).Name: 5-Chloro-1-methyl-4-nitroimidazole. Through the article, more information about this compound (cas:4897-25-0) is conveyed.

cf. C. A. 16, 2863. Bromination of 18 g. 1-methylglyoxaline in 60 cc. CHCl3 with 36 g. Br in 60 cc. CHCl3 at 5-10° gave 10.4 g. 2,4,5-tribromo-1-methylglyoxaline (I), m. 93-4.5° (Wallach, Ber. 16, 537, gives 88-9°), 0.49 g. (as picrate) of 4,5-dibromo-1-methylglyoxaline (II), m. 79-80°, and 23.3 g. (as picrate) of unchanged base. I.HCl, m. 190-200°, dissociates in H2O. I is recovered to the extent of 90% after heating with 1 mol. Na2SO3 in 20% aqueous solution for 5 hrs., 1% of II also being isolated. II was further prepared by heating 4,5-dibromo-1-methylglyoxaline with Me2SO4 and from (CONHMe)2 and PBr5 (7% and 11% with 1 and 2 mols. PBr5, resp.). II.HCl, crystallizing with 2 H2O, lost in vacuo over H2SO4, and then m. 179°; HNO3 salt, m. 153°; picrate, yellow, m. 148-9°, soluble in 6 parts hot EtOH or 30 parts boiling H2O. Methylation of 4(5)-bromoglyoxaline gives 51% III and 1.5% IV (ratio 34:1), separated by fractional crystallization of the picrates from EtOH. 5-Bromo-1-methylglyoxaline (III), b15 128°, m. 45-6°, deliquescent; HCl salt, needles with 0.5 H2O, lost at 100° and then m. 155°; HNO3 salt, anhydrous prisms, m. 155° (effervescence) soluble in 4 parts boiling H2O; H oxalate salt, needles with 0.5 H2O, lost in vacuo over H2SO4 and then m. 147°; picrate, yellow needles, m. 190°. The 4(?)-sulfonic acid, m. 284°, results in 78% yield; it is soluble in 55 parts boiling H2O, almost insoluble in cold H2O. Heating 0.38 g. of the acid with 5 cc. 30% H2SO4 for 3 hrs. at 170° gave 0.11 g. III (as picrate). The 4-nitro derivative (V) of III (80% yield), m. 180°, soluble in 85 parts boiling H2O; HCl salt, m. 155° and decomposed by H2O. V crystallines unchanged from aqueous picric acid. With aqueous Na2SO3 V yields 4-nitro-1-methylglyoxaline-5-sulfonic acid, m. 254° (decomposition); Na salt, fine needles. Hydrolysis of the acid by heating with 30% H2SO4 gives 4-nitro-1-methylglyoxaline; this establishes the orientation of these bases directly and of IV indirectly. III condenses with HCHO, by heating 6 hrs. at 130°, to give 5-bromo-2-hydroxymethyl-1-methylglyoxaline, m. 143° and soluble in 15 parts boiling H2O (yield, 42%); picrate, yellow needles, m. 165-6°. Reduction with HI and red P gives 1,2-dimethylglyoxaline. Either III or IV, heated with MeI, gives 4(5)-bromo-1,3-dimethylglyoxalinium iodide, m. 202-4°, soluble in 8 parts hot EtOH; distillation at 15 mm. and 235° gave 43% IV and some III. 4-Bromo-1-methylglyoxaline (IV) is an oil; HNO3 salt, prisms, m. 155°, soluble in about 3 parts boiling H2O; picrate, yellow needles, m. 179°, soluble in 7 parts hot EtOH. The 5(?)-sulfonic acid (yield, 77%) crystallines with 1 H2O, m. 256° (decomposition), soluble in 15 parts boiling H2O. The 5-nitro derivative (VI) (yield, 54%), m. 105°, soluble in 40 parts boiling H2O. Methylation of 7 g. 4(5)-bromo-5(4)nitroglyoxaline (VII), gave 1.7 g. VI and 1.4 g. unchanged material. Na2SO3 (20% aqueous solution) reacts with VII to give 4(5)-nitroglyoxaline-5(4)-sulfonic acid, decomposes 300° (yield, 88%); Na salt, fine needles. “”Chloroxalmethylin,”” prepared according to W., gives a HNO3 salt, m. 145° which, heated with concentrated H2SO4 1.5 hrs. at 100°, gives 5-chloro-4-nitro-1-methylglyoxaline, m. 147°, soluble in 40 parts boiling H2O; it is therefore 5-chloro-1-methylglyoxaline.

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COA of Formula: C5H5NS. 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 Compatibility of fabrication of superhydrophobic surfaces and addition of inhibitors in designing corrosion prevention strategies for electrodeposited nickel in saline solutions. Author is Noorbakhsh Nezhad, Amir Hossein; Arefinia, Reza; Kashefi, Mehrdad; Davoodi, Ali; Hosseinpour, Saman.

The aim of this study is to assess the synergistic effect of two corrosion control strategies: application of an inhibitor and enhancing the surface superhydrophobicity, for protection of electrodeposited nickel in saline solutions For this purpose, 4-Mercaptopyridine (C5H5NS) was added to the synthetic sea water solution and its corrosion inhibition efficiency was evaluated on electrodeposited smooth bright nickel layer and nickel films with hierarchical micro/nano structure. Stearic acid was used to tune the wetting properties of nickel films, from hydrophilic to superhydrophobic. Contact angle measurement, SEM, and Fourier-transform IR spectroscopy were utilized in the characterization of deposited nickel layers. Potentiodynamic polarization and electrochem. impedance spectroscopy were employed to assess the corrosion inhibition performance of inhibitor on different nickel films. Our results indicate that simultaneous increase in the surface hydrophobicity and adsorption of corrosion inhibitor strategies does not yield a better corrosion resistance and that the most effective corrosion inhibition can be obtained on the bright smooth sample after a prolonged immersion in the corrosive solution Furthermore, we show that the contact angle alone cannot be used to indicate the corrosion inhibition capability of an inhibitor.

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Application In Synthesis of Pyridine-4-thiol. 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 Mercaptopyridine-Functionalized Gold Nanoparticles for Fiber-Optic Surface Plasmon Resonance Hg2+ Sensing. Author is Yuan, Huizhen; Ji, Wei; Chu, Shuwen; Liu, Qiang; Qian, Siyu; Guang, Jianye; Wang, Jiabin; Han, Xiuyou; Masson, Jean-Francois; Peng, Wei.

As a highly toxic heavy metal ion, divalent mercuric ion (Hg2+) is one of the most widely diffused and hazardous environmental pollutants. In this work, a simple, portable, and inexpensive fiber-optic sensor based on surface plasmon resonance (SPR) effect was developed for Hg2+ detection, which takes advantage of 4-mercaptopyridine (4-MPY)-functionalized Au nanoparticles (Au NPs/4-MPY) as a signal amplification tag. Based on the coordination between Hg2+ and nitrogen in the pyridine moiety, we developed the sensor by self-assembling 4-MPY on Au film surfaces to capture Hg2+ and then introducing Au NPs/4-MPY to generate a plasmonic coupling structure with the configuration of nanoparticle-on-mirror. The coupling between localized SPR increased changes in SPR wavelength, which allowed highly sensitive Hg2+ sensing in aqueous solution The sensor exhibited superior selectivity for Hg2+ detection compared with other common metal ions in water. The sensor’s Hg2+ detection limit is 8 nM under optimal conditions. Furthermore, we validated the sensor’s practicality for Hg2+ detection in tap water samples and demonstrated its potential application for environmental water on-site monitoring.

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Epoxy compounds usually have stronger nucleophilic ability, because the alkyl group on the oxygen atom makes the bond angle smaller, which makes the lone pair of electrons react more dissimilarly with the electron-deficient system. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about Strain-Controlled Spin Transition in Heterostructured Metal-Organic Framework Thin Film.COA of Formula: C5H5NS.

Metal-organic framework (MOF) thin films have recently attracted much attention as a new platform for surface/interface research, where unconventional structural and phys. properties emerge. Among the many MOFs as candidates for fabrication of thin films, Hofmann-type MOFs {Fe(pz)[M(CN)4]} [pz = pyrazine; M = Ni (Nipz), M = Pt (Ptpz)] are attractive, because they undergo spin transitions with concomitant structural changes. Here, we demonstrate the first example of a strain-controlled spin transition in heterostructured MOF thin films. The spin transition temperature of Ptpz can be controlled in the temperature range of 300-380 K by fabricating a nanometer-sized heterostructured thin film with a Nipz buffer layer, where the smaller lattice of Nipz causes epitaxial compressive strain to the Ptpz layer. The fabricated heterostructured thin film exhibited a remarkable increase in spin transition temperature with a dynamic structural transformation, confirmed by variable-temperature (VT) X-ray diffraction and VT Raman spectroscopy. By verifying interfacial strain in a heterostructured thin film, we can rationally control the characteristics of MOFs-not only spin transition but also various phys. properties such as gas storage, catalysis, sensing, proton conductivity, and elec. properties, among others.

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Heindel, Ned D.; Egolf, Roger A.; Stefely, James S. published an article about the compound: 5-Chloro-1-methyl-4-nitroimidazole( cas:4897-25-0,SMILESS:C1=NC(=C(Cl)[N]1C)[N+]([O-])=O ).Electric Literature of C4H4ClN3O2. Aromatic heterocyclic compounds can be classified according to the number of heteroatoms or the size of the ring. The authors also want to convey more information about this compound (cas:4897-25-0) through the article.

A new class of radiosensitizing pharmaceuticals derived from 4-nitro-5-imidazolyl sulfones has its clin. potential compromised by a metabolic reaction with plasma glutathione which leads to a much less active metabolite. Entrapment of two members of the class in three different liposomes, one polymerized liposome, and a β-cyclodextrin system showed that this glutathione condensation can be suppressed by a rate factor of nearly 50-fold. Stabilizations of these metabolically labile radiosensitizers appear to relate to their lipid-buffer partition coefficients and to the fluidity of the liposome membrane in which they are entrapped.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: 5-Chloro-1-methyl-4-nitroimidazole, is researched, Molecular C4H4ClN3O2, CAS is 4897-25-0, about Fungicidal effect of 5-chloro-1-methyl-4-nitroimidazole on wood-destroying basidiomycetes, the main research direction is wood preservative chloromethylnitroimidazole.Application In Synthesis of 5-Chloro-1-methyl-4-nitroimidazole.

The fungicidal effectiveness of 5-chloro-1-methyl-4-nitroimidazole (I) [4897-25-0] against the wood-destroying fungi Coniophora puteana, Poria placenta, and Coriolus versicolor was determined Wood blocks of pine (Pinus sylvestris) and beech (Fagus sylvatica) were exposed on agar for 3 mo. I protected pine against the fungi at 1.70 kg/m3 and beech at 2.61 kg/m3, while pentachlorophenol  [87-86-5] used under the same conditions was effective at 0.96 and 4.69 ,g/m3, resp.

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The preparation of ester heterocycles mostly uses heteroatoms as nucleophilic sites, which are achieved by intramolecular substitution or addition reactions. Compound: Pyridine-4-thiol( cas:4556-23-4 ) is researched.SDS of cas: 4556-23-4.Tian, Huihui; Li, Hongbian; Fang, Ying published the article 《Binary Thiol-Capped Gold Nanoparticle Monolayer Films for Quantitative Surface-Enhanced Raman Scattering Analysis》 about this compound( cas:4556-23-4 ) in ACS Applied Materials & Interfaces. Keywords: thiol capped gold nanoparticle monolayer film SERS; gold nanoparticle; malachite green; monolayer film; quantitative SERS; self-assembly. Let’s learn more about this compound (cas:4556-23-4).

Surface-enhanced Raman scattering (SERS) can provide fingerprint information of analyte mols. with unparalleled sensitivity. However, quant. anal. using SERS has remained one of the major challenges owing to the difficulty of obtaining reproducible SERS substrates with high-d. hotspots. Here, we report the rational design and fabrication of a binary thiol-capped gold nanoparticle (AuNP) monolayer film (MLF) as a substrate for highly sensitive and quant. SERS anal. The two thiol ligands chem. bonded to the AuNPs play different roles: dodecanethiol with a long alkyl chain controls the interparticle gaps and electromagnetic coupling among AuNPs and 4-mercaptopyridine works as a Raman internal standard (IS). The binary thiol-capped AuNPs can self-assemble into an ordered MLF with high-d. hotspots and uniformly distributed IS. The as-prepared MLF has been demonstrated as a reliable SERS substrate for quant. detection of fungicide malachite green in aqueous solution, with a high enhancement factor (up to 3.3 × 107) and a low detection limit (100 pM). Moreover, the MLF SERS substrate is flexible and transparent, which has enabled in situ detection of trace fungicide residues in a shrimp tissue.

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