Category: 4556-23-4

Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Nanomaterials called Charge-Transfer Process in Surface-Enhanced Raman Scattering Based on Energy Level Locations of Rare-Earth Nd3+-Doped TiO2 Nanoparticles, Author is Zhao, Zihao; Zhao, Xiang; Zhang, Mu; Sun, Xudong, which mentions a compound: 4556-23-4, SMILESS is SC1=CC=NC=C1, Molecular C5H5NS, Electric Literature of C5H5NS.

Surface-enhanced Raman scattering (SERS) for semiconductor nanomaterial systems is limited due to weak Raman signal intensity and unclear charge-transfer (CT) processes for chem. enhancement. Here, rare-earth element neodymium-doped titanium dioxide (Nd-TiO2) nanoparticles (NPs) were synthesized by the sol-gel method. The characterizations show that the doping of Nd ions causes TiO2 NPs to show an increase in the concentration of defects and change in the energy level structure. The CT process between Nd-TiO2 NPs substrate and probe mol. 4-Mercaptopyridine (4-Mpy) was innovatively analyzed using the relative energy level location relationship of the Dorenbos model. The SERS signal intensity exhibits an exponential enhancement with increasing Nd doping concentration and reaches its optimum at 2%, which is attributed to two factors: (1) The increase in the defect concentration is beneficial to the CT process between the TiO2 and the probe mol.; (2) the introduction of 4f electron orbital energy levels of rare-earth ions created unique CT process between Nd3+ and 4-Mpy. Moreover, the Nd-TiO2 NPs substrate shows excellent SERS performance in Raman signal reproducibility (RSD = 5.31%), the limit of detection (LOD = 10-6 M), and enhancement factor (EF = 3.79 x 104). Our work not only improves the SERS performance of semiconductor substrates but also provides a novel approach to the development of selective detection of probe mols.

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Electric Literature of C5H5NS. 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 A rare case of a 2:2:1 ternary cocrystal of pyridine sulfides and trithiocyanuric acid. Author is Wzgarda-Raj, Kinga; Ksiazkiewicz, Olga; Palusiak, Marcin.

We report a rare case of a 2:2:1 ternary cocrystal consisting of two trithiocyanuric acid mols., two bis(pyridin-4-yl) sulfide mols. and 1,4-bis(pyridin-4-yl)tetrasulfane, namely, 1,3,5-triazinane-2,4,6-trithione-4-(pyridin-4-ylsulfanyl)pyridine-1,4-bis(pyridin-4-yl)tetrasulfane (2/2/1), 2C3H3N3S3·2C10H8N2S·C10H8N2S4. This interesting crystal structure with five neutral mols. per asym. unit was synthesized and characterized by means of X-ray diffraction (XRD) experiments and quantum-chem. modeling. Among various specific interactions, hydrogen and halogen bridges have a significant role in stabilizing the crystal structure. In particular, the role played by stacking interactions has been revealed by structure anal. and theor. calculations Crystallization was spontaneous and reproducible. One of the components, 1,4-bis(pyridin-4-yl)tetrasulfane, has been characterized by XRD for the first time.

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Product Details of 4556-23-4. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: Pyridine-4-thiol, is researched, Molecular C5H5NS, CAS is 4556-23-4, about Efficient Raman Enhancement in Molybdenum Disulfide by Tuning the Interlayer Spacing. Author is Li, Xuanhua; Guo, Shaohui; Su, Jie; Ren, Xingang; Fang, Zheyu.

Two-dimensional nanomaterials, such as graphene and molybdenum disulfide (MoS2), have recently attracted widespread attention as surface-enhanced Raman scattering (SERS) substrates. However, their SERS enhancement is of a smaller magnitude than that of noble metal nanomaterials, and therefore, the detection sensitivity still needs to be substantially improved for practical applications. Here, we present the first detailed studies on the effect of the (MoS2) interlayer distances on the SERS intensity enhancement. We find that MoS2 with smaller interlayer distances achieves an SERS enhancement factor as high as 5.31 x 105, which is one of the highest enhancement factors to date among the two-dimensional nanomaterial SERS sensors. This remarkable SERS sensitivity is attributed to the highly efficient charge transfer from MoS2 to probe mols. The charge-transfer ability directly determines the variable quantity dz2 orbitals of Mo elements in the MoS2-mol. system and then tunes the Raman intensity of probe mols. Our work contributes to reveal the influence of MoS2 interlayer spacing on SERS detection and to open a new way for designing a highly sensitive nonmetal SERS technol.

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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 Probing Sulfur Chemical and Electronic Structure with Experimental Observation and Quantitative Theoretical Prediction of Kα and Valence-to-Core Kβ X-ray Emission Spectroscopy, published in 2020-07-02, which mentions a compound: 4556-23-4, Name is Pyridine-4-thiol, Molecular C5H5NS, HPLC of Formula: 4556-23-4.

An extensive exptl. and theor. study of the Kα and Kβ high-resolution X-ray emission spectroscopy (XES) of sulfur-bearing systems is presented. This study encompasses a wide range of organic and inorganic compounds, including numerous exptl. spectra from both prior published work and new measurements. Employing a linear-response time-dependent d. functional theory (LR-TDDFT) approach, strong quant. agreement is found in the calculation of energy shifts of the core-to-core Kα as well as the full range of spectral features in the valence-to-core Kβ spectrum. The ability to accurately calculate the sulfur Kα energy shift supports the use of sulfur Kα XES as a bulk-sensitive tool for assessing sulfur speciation. The fine structure of the sulfur Kβ spectrum, in conjunction with the theor. results, is shown to be sensitive to the local electronic structure including effects of symmetry, ligand type and number, and, in the case of organosulfur compounds, to the nature of the bonded organic moiety. This agreement between theory and experiment, augmented by the potential for high-access XES measurements with the latest generation of laboratory-based spectrometers, demonstrates the possibility of broad anal. use of XES for sulfur and nearby third-row elements. The effective solution of the forward problem, i.e., successful prediction of detailed spectra from known mol. structure, also suggests future use of supervised machine learning approaches to exptl. inference, as has seen recent interest for interpretation of X-ray absorption near-edge structure (XANES).

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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 Rapid detection of copper ions of simulated Wilson′s disease urine based on surface-enhanced Raman spectroscopy, published in 2021, which mentions a compound: 4556-23-4, Name is Pyridine-4-thiol, Molecular C5H5NS, Recommanded Product: 4556-23-4.

Wilson′s disease (WD) is an autosomal recessive inherited disease. It is characterized by liver cirrhosis and brain degeneration caused by copper (Cu) metabolic disorder, which is one of the few neurogenetic diseases that can be treated, but improper treatment will cause disability or even death. This research constructed a method for detecting Cu2+ based on surface-enhanced Raman spectroscopy (SERS). The gold nanorods (AuNRs) substrates modified with 4-mercaptopyridine (Mpy) with uniform morphol. and dense hot spots were prepared Due to the existence of lone pairs of electrons in the nitrogen atom (N) on the pyridine ring, Cu2+ could coordinate with it to change the Raman spectrum of Mpy and realized the detection of Cu2+ with high sensitivity and selectivity. Under the condition of 25°C and reaction time of 2 min, the linear range of detection was 4.9×10-8-1×10-4 mol/L, with a detection limit of 49 nmol/L (S/N=3). This method was applied to the detection of Cu2+ in artificial urine, and the relative standard deviation (RSD) was less than 7.8%. The presented method here was simple, fast and accurate, and the detection process was nondestructive. And it had the potential to be applied to the early diagnosis and treatment of WD in the clinic.

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Zong, Cheng; Premasiri, Ranjith; Lin, Haonan; Huang, Yimin; Zhang, Chi; Yang, Chen; Ren, Bin; Ziegler, Lawrence D.; Cheng, Ji-Xin published the article 《Plasmon-enhanced stimulated Raman scattering microscopy with single-molecule detection sensitivity》. Keywords: adenine plasmon enhanced stimulated Raman scattering microscopy.They researched the compound: Pyridine-4-thiol( cas:4556-23-4 ).Product Details of 4556-23-4. 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.

Stimulated Raman scattering (SRS) microscopy allows for high-speed label-free chem. imaging of biomedical systems. The imaging sensitivity of SRS microscopy is limited to ∼10 mM for endogenous biomols. Electronic pre-resonant SRS allows detection of sub-micromolar chromophores. However, label-free SRS detection of single biomols. having extremely small Raman cross-sections (∼10-30 cm2 sr-1) remains unreachable. Here, we demonstrate plasmon-enhanced stimulated Raman scattering (PESRS) microscopy with single-mol. detection sensitivity. Incorporating pico-Joule laser excitation, background subtraction, and a denoising algorithm, we obtained robust single-pixel SRS spectra exhibiting the statistics of single-mol. events. Single-mol. detection was verified by using two isotopologues of adenine. We further demonstrated the capability of applying PESRS for biol. applications and utilized PESRS to map adenine released from bacteria due to starvation stress. PESRS microscopy holds the promise for ultrasensitive detection of mol. events in chem. and biomedical systems.

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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.Cai, Zhen-Feng; Zheng, Li-Qing; Zhang, Yao; Zenobi, Renato researched the compound: Pyridine-4-thiol( cas:4556-23-4 ).HPLC of Formula: 4556-23-4.They published the article 《Molecular scale chemical imaging of the orientation of an on-surface coordination complex by tip-enhanced Raman spectroscopy》 about this compound( cas:4556-23-4 ) in ChemRxiv. Keywords: surface coordination complex chem imaging tip enhanced Raman spectra. We’ll tell you more about this compound (cas:4556-23-4).

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 a cobalt(II) tetraphenyl-porphyrine (CoTPP) 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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Category: nitriles-buliding-blocks. 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 Anion-Recognition Studies of a Rhenium(I) 4-Mercaptopyridine Compound and Its Ligand-Coupling Products. Author is Tzeng, Biing-Chiau; Lin, I-Lin; Chen, Wen-Hui; Lee, Gene-Hsiang.

The reaction of Re(CO)5Cl with 4-mercaptopyridine (4-PySH) gave [Re(CO)3(4-HPyS)3]Cl (1), showing three hydrogen-bonding donors of 4-PySH ligands as well as a characteristic ligand-to-metal charge-transfer absorption at ∼380 nm. In this regard, a variety of anions, i.e., CN-, OAc-, F-, Cl-, Br-, I-, PF6-, NO3-, ClO4-, and H2PO4-, were examined to study anion-recognition studies through hydrogen-bonding functionalities. Upon the addition of CN- to a methanolic solution of complex 1, a remarkable spectral change with an isosbestic point at ∼314 nm in the absorption spectra was observed, with a binding constant (Kb) calculated to be 24770 M-1. Also, the OAc- anion also shows a similar trend, but a mild spectral change, with Kb calculated to be 2170 M-1. Unlike those of CN- and OAc-, the addition of F-, Cl-, Br-, and I- anions causes a less pronounced spectral change with an isosbestic point at ∼350 nm and Kb calculated to be 2863-750 M-1. However, almost no spectral change can be observed for other anions (i.e., PF6-, NO3-, H2PO4-, and ClO4-). The mol. loops of [Re(CO)3Cl(Py2S2)]2 (2; Py2S2 = 4,4′-dipyridyl disulfide) and [Re(CO)3Cl(Py2S)0.35(Py2S2)0.65]2 (3; Py2S = 4,4′-dipyridyl sulfide) can be isolated and structurally characterized by x-ray diffraction, where those crystals were grown from di-Et ether diffusion into a methanolic solution of complex 1 with [Bu4N]CN and [Bu4N]NO3, resp. Such unusual ligand-coupling reactions toward the homoligand and hybrid-ligand loops of complexes 2 and 3 can be achieved at room temperature

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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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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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