Category: 4556-23-4

In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Enhanced charge-transfer induced by conduction band electrons in aluminum-doped zinc oxide/molecule/Ag sandwich structures observed by surface-enhanced Raman spectroscopy, published in 2022-03-15, which mentions a compound: 4556-23-4, mainly applied to aluminum doped zinc oxide silver sandwich structure charge transfer; Al-doped ZnO; Charge-transfer; Conduction band; SERS, Recommanded Product: 4556-23-4.

In the semiconductor/mol./metal system, enhancing the efficiency of the charge-transfer (CT) plays a pivotal role in improving the sensitivity of semiconductor-based surface-enhanced Raman scattering (SERS). In this work, use of SERS for detection of an enhanced CT in a chem.-etched Al-doped ZnO (AZO), 4-mercaptopyridine (MPy) mol., and Ag nanoparticles (NPs) (AZO/MPy/Ag) sandwich structure is reported. A series of CT routes are proposed in the energy level diagram of AZO/MPy/Ag assemblies under the excitation line at 633 nm. Very interestingly, for the first of its kind, a significant CT route from the conduction band (CB) of AZO to the LUMO (LUMO) of MPy mol. is detected. This route can remarkably improve the degree of CT in the AZO/MPy/Ag system by about 48% compared with that of the ZnO/MPy/Ag system. Furthermore, the uniquely enhanced CT route is also further confirmed by alternative probe mols. like p-aminothiophenol (PATP) and 4-mercaptobenzoic acid (MBA). The discovery of this extra CT route will inevitably play an irreplaceable role in SERS enhancement through its participating in the CT enhancement mechanism.

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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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Recommanded Product: Pyridine-4-thiol. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about Gold nanoflowers grown in a porous Si/SiO2 matrix: The fabrication process and plasmonic properties. Author is Osminkina, Liubov A.; Zukovskaja, Olga; Agafilushkina, Svetlana N.; Kaniukov, Egor; Stranik, Ondrej; Gonchar, Kirill A.; Yakimchuk, Dmitry; Bundyukova, Victoria; Chermoshentsev, Dmitry A.; Dyakov, Sergey A.; Gippius, Nikolay A.; Weber, Karina; Popp, Jurgen; Cialla-May, Dana; Sivakov, Vladimir.

Highly branched metal nanostructures are of great interest for creating highly sensitive sensors of various mols. through the use of surface-enhanced Raman scattering. However, the method of manufacturing such nanostructures is often complex and difficult to reproduce. Herein, we report a simple, one-pot synthesis of flower-like gold nanostructures (AuNFs) in a porous Si/SiO2 matrix for potential surface enhanced Raman spectroscopy (SERS) applications. Templates covered with 500-nm diameter AuNFs with rough coral-like petals were obtained through a simple electroless reduction of gold(III) chloride salt in diluted hydrofluoric acid inside pores in the Si/SiO2 layer, which were obtained by swift heavy ion track technol. Detailed SERS anal. showed that single nanoflowers are capable of enhancing Raman signals and can be used as independent nanosensors. Having a few AuNFs in close proximity to each other enables more “”hot spots”” to be formed with an even greater increase in signal intensity. Using such substrates, reliable detection of 4-mercaptopyridine could be achieved down to 0.01μM concentration Finally, we theor. demonstrate that the AuNFs are characterized by a wide-band plasmonic mode as well as by hot spots in the electromagnetic near-field distribution, which can result in a high enhancement factor for Raman scattering.

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In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Cobalt-Catalyzed Ligand-Controlled Divergent Regioselective Reactions of 1,6-Enynes with Thiols, published in 2020-06-08, which mentions a compound: 4556-23-4, mainly applied to cobalt catalyzed divergent regioselective cyclization reaction enyne thiol; carbocyclic organosulfur pyrrole pyrrolizine compound preparation reactivity, Application of 4556-23-4.

An efficient Co-catalyzed method for the synthesis of carbocyclic organosulfur compounds from 1,6-enynes and thiols was developed. The significance of this methodol. is the ability to give three different cyclization products depending on the ligands used. The products were obtained in moderate to good yields with broad substrate scope.

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Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 4556-23-4, is researched, SMILESS is SC1=CC=NC=C1, Molecular C5H5NSJournal, New Journal of Chemistry called Synthesis of mono/dinuclear rhenium(I) tricarbonyl substituted with 4-mercaptopyridine related ligands: spectral and theoretical evidence of thiolate/thione interconversion, Author is Gomez, Alejandra; Jara, Geraldine; Flores, Erick; Maldonado, Tamara; Godoy, Fernando; Munoz-Osses, Michelle; Vega, Andres; Mera, Raul; Silva, Carlos; Pavez, Jorge, the main research direction is mono dinuclear rhenium tricarbonyl mercaptopyridine preparation crystal mol structure; thiolate thione interconversion rhenium tricarbonyl mercaptopyridine complex.Safety of Pyridine-4-thiol.

The synthesis, characterization, and spectroscopic and theor. studies of new κ1-S monometallic Re-spy (1)/Re-thiopy (2) and κ1-N-bimetallic Re2-dps (3)/Re2-dpds (4) complexes substituted with 4-mercaptopyridine derivatives are reported. The obtainment of either monosulfide bridge-complex (3) or disulfide bridge-complex (4) depends on the reaction media. The structure of complex 3 was confirmed by monocrystal x-ray diffraction. Addnl. it was possible to determine the presence of an intramol. interconversion between 1 and 2 mediated by solvent mols. through the intermediate species 1-H+ using UV-Vis and NMR spectroscopy. Electronic spectra calculated by TD-DFT feature distinct MLCT transitions for 2 and show that the π-stacking interaction present in 1 is broken in the methanol/water mixture, leading to a structural distribution similar to 2. Cyclic voltammograms of all complexes display the characteristic reduction process for the rhenium center and the bipyridine ligand. Addnl., an irreversible process associated with the bridging ligand for 3 and 4 is observed

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Nitrile – Wikipedia,
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Quality Control of Pyridine-4-thiol. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about SERS-active carboxymethyl cellulose-based gold nanoparticles: high-stability in hypersaline solution and selective response in the Hofmeister series. Author is de Melo, Fernando Menegatti; Fante, Allef Soares; Zamarion, Vitor de M.; Toma, Henrique Eisi.

Gold nanoparticles (AuNP) were directly synthesized with sodium CM-cellulose (CMC) by a simple one-pot procedure, exhibiting surprising protection against salt-induced aggregation. The AuNP@CMC nanoparticles are reactive towards thiol ligands such as 4-mercaptopyridine (4MPy) and 2,4,6-trimercapto-1,3,5-triazine (TMT) indicating a labile character for the CMC coating. Aggregation can be promoted by those ligands combined with salt induced effects along the Hofmeister series, allowing one to explore the local enhanced elec. fields (hot spots) as surface enhanced Raman (SERS) sensors. Such behavior is selective for several salts within the Hofmeister series, exposing the role of the ligand exchange dynamics in the system.

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The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: Pyridine-4-thiol(SMILESS: SC1=CC=NC=C1,cas:4556-23-4) is researched.Safety of Pyridine-4-thiol. The article 《Monitoring the Changes of pH in Lysosomes during Autophagy and Apoptosis by Plasmon Enhanced Raman Imaging》 in relation to this compound, is published in Analytical Chemistry (Washington, DC, United States). Let’s take a look at the latest research on this compound (cas:4556-23-4).

Lysosomes are acidic organelles that not only participate in intracellular degradation but also relate to various cellular functions. Abnormal pH in lysosomes would lead to lysosomal dysfunction, which may further result in many diseases. In this work, the authors statistically analyze the pH change in the lysosomes of HeLa cells model by using surface enhanced Raman scattering (SERS) imaging technique. The authors prepared a plasmon Raman pH probe and localized the pH probe to lysosomes via an incubation-depletion method. The pH profiles within lysosomes during the process of cellular autophagy and apoptosis were monitored in situ by SERS imaging. The pH in lysosomes decreased slightly during the process of autophagy, while the pH in lysosomes increased during apoptosis. The phenomenon, in general, is consistent with the current biol. knowledge. However, the authors did not observe significant variation of pH between different individual cells. This information might provide an in depth understanding about the relationship of lysosomal pH with fundamental cellular functions and mechanism of diseases.

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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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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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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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