Category: 4556-23-4

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 The 4-Mercaptopyridine Modified Fiber Optic Plasmonic Sensor for Sub-nM Mercury (II) Detection, published in 2022-03-31, which mentions a compound: 4556-23-4, Name is Pyridine-4-thiol, Molecular C5H5NS, Electric Literature of C5H5NS.

In this paper, we propose and demonstrate a high-performance mercury ion sensor with sub-nM detection limit, high selectivity, and strong practicability based on the small mol. of the 4-mercaptopyridine (4-MPY) modified tilted fiber Bragg grating surface plasmon resonance (TFBG-SPR) sensing platform. The TFBG-SPR sensor has a rich mode field distribution and a narrow bandwidth, which can detect the microscopic phys. and chem. reactions on the sensor surface with high sensitivity without being disturbed by the external temperature For the environmental compatibility and highly efficient capture of the toxic mercury ion, 4-MPY is modified on the sensor surface forming a stable (4-MPY)-Hg-(4-MPY) structure due to the specific combination between the nitrogen of the pyridine moiety and the Hg2+ via multidentate N-bonding. Moreover, gold nanoparticles (AuNPs) are connected to the sensor surface through the (4-MPY)-Hg-(4-MPY) structure, which could play an important role for signal amplification. Under the optimized conditions, the limit of detection of the sensor for mercury ions detection in the solution is as low as 1.643×10-10 M (0.1643nM), and the detection range is 1×10-9 M – 1×10-5 M. At the same time, the mercury ion spiked detection with tap water shows that the sensor has the good selectivity and reliability in actual water samples. We develop a valuable sensing technol. for on-time environmental Hg2+ detection and in-vivo point of care testing in clinic applications.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about A rotating disk electrode study on catalytic activity of iron(II) phthalocyanine-modified electrodes for oxygen reduction in acidic media, the main research direction is iron phthalocyanine oxygen reduction acidic media rotating disk electrode.Application In Synthesis of Pyridine-4-thiol.

Catalytic activity of monometric metal macrocycles for oxygen reduction reaction (ORR) was investigated using rotating disk electrode voltammetry in acidic media. Iron(II) phthalocyanines (FePc) and cobalt(II) tetraphenylporphyrins (CoTPP) were immobilized on Au surfaces through mol. wires with different terminal groups of pyridine and isocyanide. The measured ORR behavior of FePc was largely influenced by the axial ligand while CoTPP promoted only the two-electron reaction regardless of the axial ligand. The FePc immobilized with pyridine was easily detached from the surface under the ORR condition, and was able to promote the four-electron reaction only under the high overpotential application. The FePc with isocyanide was more stable with the activity for the four-electron reaction, due to stronger electron donation to Fe central ions.

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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.COA of Formula: C11H19NO4S. The article 《Metal-free SERS substrate based on rGO-TiO2-Fe3O4 nanohybrid: contribution from interfacial charge transfer and magnetic controllability》 in relation to this compound, is published in Physical Chemistry Chemical Physics. Let’s take a look at the latest research on this compound (cas:4556-23-4).

The exploitation of new types of non-metal surface-enhanced Raman scattering (SERS) substrates with high performances and the exploration of enhancement mechanisms are of vital importance for the development of the SERS technol. due to its potential prospects in both the spectroscopy and material fields. Here, a magnetic SERS-active substrate hybridized by reduced graphene oxide (rGO), TiO2 and Fe3O4 (rGO-TiO2-Fe3O4) was successfully prepared via the combination of a simple sol-hydrothermal method and a co-precipitation method. The as-synthesized rGO-TiO2-Fe3O4 nanohybrid not only exhibited outstanding SERS detection ability with high sensitivity and spectral reproducibility, but also could be recycled with high stability based on its self-cleaning capacity and magnetism. Exploiting these features, it could be used for the SERS detection of 4-mercaptobenzoic acid (4-MBA), 4-mercaptopyridine (4-MPy), 6-mercaptopurine monohydrate (6-MP), 1,2-di(4-pyridyl) ethylene (BPE) and p-aminobenzoic acid (PABA) with the detection limits of 1.0 × 10-10, 1.0 × 10-8, 1.0 × 10-10, 1.0 × 10-10 and 1.0 × 10-9 mol L-1, resp.; these are the highest SERS sensitivity values among those reported for semiconductor substrates and are even lower than that of noble metal substrates. Meanwhile, an SERS enhancement mechanism from the synergistic effects of the rGO, TiO2 and Fe3O4 components was proposed to explain the observed considerable SERS enhancement on rGO-TiO2-Fe3O4.

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The chemical properties of alicyclic heterocycles are similar to those of the corresponding chain compounds. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about Raman signal enhancement tunable by gold-covered porous silicon films with different morphology, the main research direction is gold porous silicon film morphol; gold; plasmonics; porous silicon; sensorics; surface-enhanced Raman scattering.Related Products of 4556-23-4.

The ease of fabrication, large surface area, tunable pore size and morphol. as well surface modification capabilities of a porous silicon (PSi) layer make it widely used for sensoric applications. The pore size of a PSi layer can be an important parameter when used as a matrix for creating surface-enhanced Raman scattering (SERS) surfaces. Here, we evaluated the SERS activity of PSi with pores ranging in size from meso to macro, the surface of which was coated with gold nanoparticles (Au NPs). We found that different pore diameters in the PSi layers provide different morphol. of the gold coating, from an almost monolayer to 50 nm distance between nanoparticles. Methylene blue (MB) and 4-mercaptopyridine (4-MPy) were used to describe the SERS activity of obtained Au/PSi surfaces. The best Raman signal enhancement was shown when the internal diameter of torus-shaped Au NPs is around 35 nm. To understand the role of plasmonic resonances in the observed SERS spectrum, we performed electromagnetic simulations of Raman scattering intensity as a function of the internal diameter The results of these simulations are consistent with the obtained exptl. data.

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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.Quality Control of Pyridine-4-thiol.Li, Kan; Li, Jing-jing; Zhao, Ni; Ma, Ying; Di, Bin published the article 《Removal of tetracycline in sewage and dairy products with high-stable MOF》 about this compound( cas:4556-23-4 ) in Molecules. Keywords: metal organic framework tetracycline adsorption milk yogurt sewage; MOF; adsorption and removal; tetracycline. Let’s learn more about this compound (cas:4556-23-4).

Serious environmental and human health problems caused by the abuse of antibiotics have attracted worldwide concern. Recently, metal-organic frameworks (MOFs) with high porosity have drawn wide attention for their effects in the adsorption and removal of pollutants from complex matrixes. Herein, a high-stable metal organic framework (MOF), i.e., ((ZnCl2)3(L)2·DMF)n, where L=1,3,5-tris((pyridin-4-ylthio)methyl)benzene), MOF 1, was applied to adsorb and remove tetracycline from sewage and dairy products. The results showed that MOF 1 exhibited a strong performance in the adsorption of tetracycline. The effects of initial pH values, adsorbent dose, contact time and ionic strength of the adsorption performance of MOF 1 were investigated. The adsorption kinetics best fit the pseudo-second order model, and the adsorption isotherms matched the Langmuir adsorption model well. It was indicated that both chem. adsorption and phys. adsorption play an important role in the adsorption process, and the adsorption of tetracycline was homogeneous and occurred on a monolayer on the surface of MOF 1. Addnl., the stability of MOF 1 and the details of the adsorption mechanism were also investigated. Thus, this study provides a new candidate for the application of MOFs-based adsorbents in the removal of antibiotics from sewage and dairy products.

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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, Article, Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy called Effect of the functionalization agent on the surface-enhanced Raman scattering (SERS) spectrum: Case study of pyridine derivatives, Author is Dumont, Elodie; De Bleye, Charlotte; Haouchine, Merzouk; Coic, Laureen; Sacre, Pierre-Yves; Hubert, Philippe; Ziemons, Eric, the main research direction is functionalization agent surface enhanced raman scattering pyridine derivative; Aggregation; Functionalization agents; Pyridine derivatives; Stability; Surface-enhanced Raman scattering (SERS).HPLC of Formula: 4556-23-4.

Nowadays, the use of functionalized surface-enhanced Raman scattering (SERS) substrates has become common. These surface modifying agents notably act as Raman reporters, as sensors of biol. processes (pH, redox probes) or to increase the sensitivity and/or the specificity of SERS detections. However, the effects of the functionalization agents are deeply examined in very few studies, even though they can affect the aggregation behavior of the SERS substrate. Moreover, depending on their concentration and on the pH, their spectral signature can be modified and they can even degrade if stored inappropriately. In this context, this paper aims at emphasizing the importance of the different aspects previously listed in the selection of a functionalization agent. Pyridine derivatives were picked out to highlight these parameters, as some of these compounds are commonly used to be grafted onto SERS substrates. Two widespread syntheses of nanoparticles were selected as SERS substrates: citrate-reduced gold and silver nanoparticles. The surface of the nanoparticles was functionalized with several pyridine derivatives at different concentrations and in several solvents. It was observed that the mols. under study had a concentration-dependent effect on nanoparticle aggregation. A stability study was furthermore conducted in order to determine the best preservation conditions of the grafting solutions In conclusion, this paper shines a light on the relevance of the investigation of the too-often neglected behavior of the surface modifying agents. Before their application in SERS analyses, parameters such as the label concentration should therefore be included in an exptl. design to optimize the sample preparation

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Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 4556-23-4, is researched, Molecular C5H5NS, about Tuning the Surface-Passivating Ligand Anchoring Position Enables Phase Robustness in CsPbI3 Perovskite Quantum Dot Solar Cells, the main research direction is mercaptopyridine ligand posttreatment erovskite quantum dot solar cell.Category: nitriles-buliding-blocks.

Cubic CsPbI3 perovskite quantum dots (PQDs) with ideal optoelectronic properties are promising materials for solution-processed photovoltaics. However, their phase stability suffers from the weakly bound surface ligands. Here, we report the adoption of p-mercaptopyridine ligand post-treatment on PQDs and obtained enhanced electronic coupling and cubic phase robustness in comparison with the treatment using analogous o-mercaptopyridine and pyridine ligands. As a result, CsPbI3 PQDs solar cells achieved an efficiency of 14.25%. More importantly, the device stability was drastically improved, showing decent efficiency after storage under ambient conditions for ~70 days. We revealed that tuning of the anchoring position can facilely enhance the ligand binding strength and surface coverage, providing efficient ways to significantly improve the performance and stability of PQD-based optoelectronic devices.

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Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 4556-23-4, is researched, Molecular C5H5NS, about A Strategy for Constructing Pore-Space-Partitioned MOFs with High Uptake Capacity for C2 Hydrocarbons and CO2, the main research direction is gas adsorption enthalpy MOF hydrocarbon; 4,4′-dipyridylsulfide; gas adsorption; metal-organic frameworks; open metal sites; pore space partition.COA of Formula: C5H5NS.

Introduction of pore partition agents into hexagonal channels of MIL-88 type (acs topol.) endows materials with high tunability in gas sorption. Here, we report a strategy to partition acs framework into pacs (partitioned acs) crystalline porous materials (CPM). This strategy is based on insertion of in situ synthesized 4,4′-dipyridylsulfide (dps) ligands. One third of open metal sites in the acs net are retained in pacs MOFs; two thirds are used for pore-space partition. The Co2V-pacs MOFs exhibit near or at record high uptake capacities for C2H2, C2H4, C2H6, and CO2 among MOFs. The storage capacity of C2H2 is 234 cm3 g-1 (298 K) and 330 cm3 g-1 (273 K) at 1 atm for CPM-733-dps (the Co2V-BDC form, BDC = 1,4-benzenedicarboxylate). These high uptake capacities are accomplished with low heat of adsorption, a feature desirable for low-energy-cost adsorbent regeneration. CPM-733-dps is stable and shows no loss of C2H2 adsorption capacity following multiple adsorption-desorption cycles.

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Recommanded Product: Pyridine-4-thiol. 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: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about The Synthesis of Pyridyl[2.2]paracyclophanes by Palladium-Catalyzed Cross-Coupling of Pyridine Sulfinates. Author is Mungalpara, Maulik N.; Plieger, Paul G.; Rowlands, Gareth J..

Substituted planar chiral pyridyl[2.2]paracyclophanes such as I were prepared by the palladium-catalyzed desulfinative cross-coupling of bromo[2.2]paracyclophanes and pyridine sulfinate salts. Yet the synthesis of many pyridine-substituted [2.2]paracyclophanes was more challenging than expected due to the instability of traditional coupling partners. Pyridine sulfinates offered a solution to this shortcoming, permitting pyridyl[2.2]paracyclophanes to be prepared from readily available bromo[2.2]paracyclophanes. Amine, bromine and ester substituted planar chiral pyridines that were hard to synthesize by other methods were formed but formation of (bis)pyridines was still problematic.

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de Gombert, Antoine; McKay, Alasdair I.; Davis, Christopher J.; Wheelhouse, Katherine M.; Willis, Michael C. 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.

Pyridine and related heterocyclic sulfinates have recently emerged as effective nucleophilic coupling partners in palladium-catalyzed cross-coupling reactions with (hetero)aryl halides. These sulfinate reagents are straightforward to prepare, stable to storage and coupling reaction conditions, and deliver efficient reactions, thus offering many advantages, compared to the corresponding boron-derived reagents. Despite the success of these reactions, there are only scant details of the reaction mechanism. In this study, we use structural and kinetic anal. to investigate the mechanism of these important coupling reactions in detail. We compare a pyridine-2-sulfinate with a carbocyclic sulfinate and establish different catalyst resting states, and turnover limiting steps, for the two classes of reagent. For the carbocyclic sulfinate, the aryl bromide oxidative addition complex is the resting state intermediate, and transmetalation is turnover-limiting. In contrast, for the pyridine sulfinate, a chelated Pd(II) sulfinate complex formed post-transmetalation is the resting-state intermediate, and loss of SO2 from this complex is turnover-limiting. We also investigated the role of the basic additive potassium carbonate, the use of which is crucial for efficient reactions, and deduced a dual function in which carbonate is responsible for the removal of free sulfur dioxide from the reaction medium, and the potassium cation plays a role in accelerating transmetalation. In addition, we show that sulfinate homocoupling is responsible for converting Pd(OAc)2 to a catalytically active Pd(0) complex. Together, these studies shed light on the challenges that must be overcome to deliver improved, lower temperature versions of these synthetically important processes.

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