Day: April 11, 2022

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: 494-52-0, is researched, SMILESS is C1(C=NC=CC=1)[C@@H]1CCCCN1, Molecular C10H14N2Journal, Article, Environmental Monitoring and Assessment called Use of the Chemcatcher passive sampler and time-of-flight mass spectrometry to screen for emerging pollutants in rivers in Gauteng Province of South Africa, Author is Rimayi, Cornelius; Chimuka, Luke; Gravell, Anthony; Fones, Gary R.; Mills, Graham A., the main research direction is water pollution Chemcatcher mass spectra South Africa; Chemcatcher®; Emerging pollutants; Pharmaceuticals and personal care products; Screening; Surface water; Time-of-flight mass spectrometry.Product Details of 494-52-0.

Many rivers in urbanized catchments in South Africa are polluted by raw sewage and effluent to anextent that their ecol. function has been severely impaired. The Hennops and Jukskei Rivers lying in the Hartbeespoort Dam catchment are two of the worst impacted rivers in South Africa and are in need of rehabilitation. Passive sampling (Chemcatcher with a HLB receiving phase) together with high-resolution tandem mass spectrometry-targeted screening was used to provide high sensitivity and selectivity for the identification of a wide range of emerging pollutants in these urban waters. Over 200 compounds, including pesticides, pharmaceuticals and personal care products, drugs of abuse and their metabolites were identified. Many substances (∼180) being detected for the first time in surface water in South Africa. General medicines and psychotropic drugs were the two most frequently detected groups in the catchment. These accounted for 49% of the emerging pollutants found. Of the general medicines, antihypertensive agents, beta-blocking and cardiac drugs were the most abundant (28%) classes detected. The Hennops site, downstream of a dysfunctional wastewater treatment plant, was the most polluted with 123 substances detected. From the compounds detected, peak intensity-based prioritisation was used to identify the five most abundant pollutants, being in the order caffeine > lopinavir > sulfamethoxazole > cotinine > trimethoprim. This work provides the largest available high-quality dataset of emerging pollutants detected in South African urban waters. The data generated in this study provides a solid foundation for subsequent work to further characterize (suspect screening) and quantify (target anal.) these substances.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Lombard, Jean; Lepretre, Jean-Claude; Chauvin, Jerome; Collomb, Marie-Noelle; Deronzier, Alain published an article about the compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0,SMILESS:CC1=CC=C(C2=CC(C3=NC=CC=C3)=NC(C4=NC=CC=C4)=C2)C=C1 ).Formula: C22H17N3. 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:89972-77-0) through the article.

A trinuclear [{RuII(bpy)2(bpy-terpy)}2FeII]6+ complex (I) in which a FeII-bis-terpyridine-like center is covalently linked to two RuII-tris-bipyridine-like moieties by a bridging bipyridine-terpyridine ligand has been synthesized and characterized. Its electrochem., photophys. and photochem. properties have been investigated in CH3CN and compared with those of mononuclear model complexes. The cyclic voltammetry of (I) exhibits, in the pos. region, two successive reversible oxidation processes, corresponding to the FeIII/FeII and RuIII/RuII redox couples. These systems are clearly separated (ΔE1/2 = 160 mV), demonstrating the lack of an electronic connection between the two subunits. The two oxidized forms of the complex, [{RuII(bpy)2(bpy-terpy)}2FeIII]7+ and [{RuIII(bpy)2(terpy-bpy)}2FeIII]9+, obtained after two successive exhaustive electrolyzes, are stable. The complex I is poorly luminescent, indicating that the covalent linkage of the RuII-tris-bipyridine to the FeII-bis-terpyridine subunit leads to a strong quenching of the RuII* excited state by energy transfer to the FeII center. Luminescence lifetime experiments show that the process occurs within 6 ns. The nature of the energy transfer process is discussed and an intramol. energy exchange is proposed as a preferable deactivation pathway. Nevertheless this energy transfer can be efficiently quenched by an electron transfer process in the presence of a large excess of the 4-bromophenyldiazonium cation, playing the role of a sacrificial oxidant. Finally complete photoinduced oxidation of (I) has been performed by continuous photolysis experiments in the presence of a large excess of this sacrificial oxidant. The comparison with a mixture of the corresponding mononuclear model complexes has been made.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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, Inorganic Chemistry called Electron Donor-Acceptor Dyads Based on Ruthenium(II) Bipyridine and Terpyridine Complexes Bound to Naphthalenediimide, Author is Johansson, Olof; Borgstroem, Magnus; Lomoth, Reiner; Palmblad, Magnus; Bergquist, Jonas; Hammarstroem, Leif; Sun, Licheng; Kermark, Bjoern, which mentions a compound: 89972-77-0, SMILESS is CC1=CC=C(C2=CC(C3=NC=CC=C3)=NC(C4=NC=CC=C4)=C2)C=C1, Molecular C22H17N3, HPLC of Formula: 89972-77-0.

Two series of photosensitizer-electron acceptor complexes were synthesized and fully characterized: ruthenium(II) tris(bipyridine) {[RuII(bpy)2(bpy-X-NDI)], where X = -CH2-, tolylene, or phenylene, bpy is 2,2′-bipyridine, and NDI is naphthalenediimide} and ruthenium(II) bis(terpyridine) {[RuII(Y-tpy)(tpy-X-NDI)], where Y = H or tolyl and X = tolylene or phenylene, and tpy = 2,2′:6′,2”-terpyridine}. The complexes were studied by cyclic and differential pulse voltammetry and by steady state and time-resolved absorption and emission techniques. Rates for forward and backward electron transfer were investigated, following photoexcitation of the ruthenium(II) polypyridine moiety. The terpyridine complexes were only marginally affected by the linked diimide unit, and no electron transfer was observed In the bipyridine complexes the authors achieved efficient charge separation For the complexes containing a Ph link between the ruthenium(II) and diimide moieties, the results suggest a biphasic forward electron-transfer reaction, in which 20% of the charge-separated state was formed via population of the naphthalenediimide triplet state.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Li, Yu Yang; Wei, Zhen Hong; Ng, Seik Weng published an article about the compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0,SMILESS:CC1=CC=C(C2=CC(C3=NC=CC=C3)=NC(C4=NC=CC=C4)=C2)C=C1 ).Reference of 4-(p-Tolyl)-2,2:6,2-terpyridine. 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:89972-77-0) through the article.

The title compound, [AgCd(NCS)3(C22H17N3)]n, is a heteroatom ribbon coordination polymer. The central Cd atom is chelated by the 4′-p-tolyl-2,2′:6′,2”-terpyridine ligand and is coordinated by the N atoms of three thiocyanate ions in an octahedral geometry whereas the Ag atom is coordinated by the four S atoms of four thiocyanate ions in a distorted tetrahedral geometry. Of the three thiocyanate ions, one functions in a μ2-bridging mode and two in a μ3-bridging mode. The ribbon coordination polymer propagates along the a-axis.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Xu, Lei; Fang, Xiangjun; Wu, Weijie; Chen, Hangjun; Mu, Honglei; Gao, Haiyan published the article 《Effects of high-temperature pre-drying on the quality of air-dried shiitake mushrooms (Lentinula edodes)》. Keywords: Lentinula drying ketone aldehyde; Formaldehyde; High-temperature pre-drying; Shiitake mushroom.They researched the compound: 5,6-Dihydro-2H-pyran-2-one( cas:3393-45-1 ).Synthetic Route of C5H6O2. 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:3393-45-1) here.

We investigated the relationship between the pre-drying temperature and overall quality of dried shiitake mushrooms (Lentinula edodes). Results showed that high-temperature pre-drying significantly increased the rehydration ratio and hardness of dried shiitake mushrooms, but decreased the degree of shrinkage, degree of browning, and formaldehyde content. The levels of enzyme activity were high throughout the pre-drying process and benefitted the formation of flavoured substances. Furthermore, high-temperatures pre-drying also resulted in a higher content of sulfur compounds These results indicated that the pre-drying processing had significant impacts on the overall quality of dried shiitake mushrooms. This may pave the way for increasing the economic value of dried shiitake mushrooms.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Synthetic Route of C5H8O3. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: (S)-5-(Hydroxymethyl)dihydrofuran-2(3H)-one, is researched, Molecular C5H8O3, CAS is 32780-06-6, about SmI2 promoted elimination in 5-O-silyl derivatives of D-ribono-1,4-lactone. Author is Zunszain, Patricia A.; Varela, Oscar.

Regioselective silylation of D-ribono-1,4-lactone with 1.1 molar equivalents of tert-butylchlorodiphenylsilane led to the 5-O-silyl derivative (72% yield). The free HO-2 and HO-3 were acetylated or benzoylated to give the products in almost quant. yield. The SmI2-promoted elimination of the 2,3-acyloxy groups was applied to these products. It was proven that the silyloxy group was stable under the reaction conditions, and the butenolide 5-O-tert-butyldiphenylsilyl-2,3-dideoxy-D-glycero-pent-2-eno-1,4-lactone was obtained in over 50% yield. In order to establish its optical purity, the butenolide was hydrogenated and O-desilylated to the (S)-4-hydroxymethyl-1,4-butyrolactone. Alternatively, enantiomerically pure 4-hydroxymethyl-1,4-butyrolactone was prepared from L-glutamic acid. The optical rotations of 4-hydroxymethyl-1,4-butyrolactone from both preparations were very coincident, indicating high optical purity (ee > 05%) for the butenolide.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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.Bhaumik, Chanchal; Das, Shyamal; Saha, Debasish; Dutta, Supriya; Baitalik, Sujoy researched the compound: 4-(p-Tolyl)-2,2:6,2-terpyridine( cas:89972-77-0 ).Application In Synthesis of 4-(p-Tolyl)-2,2:6,2-terpyridine.They published the article 《Synthesis, Characterization, Photophysical, and Anion-Binding Studies of Luminescent Heteroleptic Bis-Tridentate Ruthenium(II) Complexes Based on 2,6-Bis(Benzimidazol-2-yl)Pyridine and 4′-Substituted 2,2′:6′,2” Terpyridine Derivatives》 about this compound( cas:89972-77-0 ) in Inorganic Chemistry. Keywords: ruthenium bisbenzimidazolylpyridine substituted terpyridine complex preparation crystal structure; cyclic voltammetry ruthenium bisbenzimidazolylpyridine substituted terpyridine complex; luminescence ruthenium bisbenzimidazolylpyridine substituted terpyridine complex; anion receptor sensor ruthenium bisbenzimidazolylpyridine substituted terpyridine complex. We’ll tell you more about this compound (cas:89972-77-0).

A series of heteroleptic tridentate ruthenium(II) complexes of composition [(H2pbbzim)Ru(tpy-X)](PF6)2 (1-7), where H2pbbzim = 2,6-bis(benzimidazole-2-yl)pyridine and tpy-X = 4′-substituted terpyridine ligands with X = H, p-methylphenyl (PhCH3), p-bromomethylphenyl (PhCH2Br), p-dibromomethylphenyl (PhCHBr2), p-cyanomethylphenyl (PhCH2CN), p-triphenylphosphonium methylphenyl bromide (PhCH2PPh3Br), and 4′-formylphenyl (PhCHO) groups, was synthesized and characterized by using standard anal. and spectroscopic techniques. These compounds were designed to increase the excited-state lifetime of ruthenium(II) bis(terpyridine)-type complexes. The x-ray crystal structure of a representative compound 2, which crystallized with monoclinic space group P2(1)/c, was determined The absorption spectra, redox behavior, and luminescence properties of the ruthenium(II) complexes were thoroughly studied. All of the complexes display moderately strong luminescence at room temperature with lifetimes at 10-58 ns. Correlations were obtained for the Hammett σp parameter with their MLCT emission energies, lifetimes, redox potentials, proton NMR chem. shifts, etc. The anion binding properties of all the complexes as well as the parent ligand H2pbbzim were studied in acetonitrile using absorption, emission, and 1H NMR spectral studies, and the metalloreceptors act as sensors for F-, AcO-, and to some extent H2PO4-. At a relatively lower concentration of anions, a 1:1 H-bonded adduct is formed; however, in the presence of an excess of anions, stepwise deprotonation of the two benzimidazole N-H fragments occurs, an event which is signaled by the development of vivid colors visible with the naked eye. The receptor-anion binding constants were evaluated. Cyclic voltammetric (CV) measurements carried out in acetonitrile-dimethylformamide (9:1) provided evidence in favor of anion (F-, AcO-) concentration dependent electrochem. responses, enabling 1-7 to act as suitable electrochem. sensors for F- and AcO- ions.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: 11-Bromoundecanoic acid(SMILESS: O=C(O)CCCCCCCCCCBr,cas:2834-05-1) is researched.Safety of 2-(7-Bromo-1H-indol-3-yl)acetic acid. The article 《Lateral fluoro-substitution driven molecular packing difference in a series of pyridinium-based chiral ionic liquid crystals》 in relation to this compound, is published in Liquid Crystals. Let’s take a look at the latest research on this compound (cas:2834-05-1).

A series of pyridinium-based chiral ionic liquid crystals (ILCs) such as I [X = H, F] and the intermediated, non-ionic ones (NILCs) such as II, were designed and synthesized. All ILCs exhibited enantiotropic SmA phases, while all NILCs exhibit enantiotropic cholesteric and SmA phases. In addition, few of NILCs and ILCs exhibited enantiotropic SmC* phases. Due to the Coulombic force, the clearing points of the ILCs were higher than those of the corresponding NILCs. For ILCs, the lateral fluoro-substitution not only decreased the clearing points, but also drives the formation of bilayer mol. packing structures at the smectic phases.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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: (S)-3-(Piperidin-2-yl)pyridine, is researched, Molecular C10H14N2, CAS is 494-52-0, about Thermal desorption-cooled injection system-gas chromatography-mass spectrometry for simultaneous determination of seven kinds of alkaloids and nine kinds of flavor compounds in cigarette.Name: (S)-3-(Piperidin-2-yl)pyridine.

A novel method for determination of seven kinds of alkaloids (isoquinoline, nicotine, 3-(2-pyrrolidinyl) pyridine nornicotine, myosmine, β-nicotyrine, Anabasine, 2,3′-bipyridine, and anabaseine) and nine kinds of flavor compounds (hydrocoumarin, vanillin, coumadin, Et vanillin, Me vanillin, 7-Me coumarin, 7-methoxycoumarin, 7-ethoxy-4-methylcoumarin, and pyranocoumarin) in cigarette by thermal desorption-cooled injection system coupled with gas chromatog.-mass spectrometry (TDU-CIS-GC-MS) was developed. By optimizing the conditions such as TDU (time, temperature, and flow rate of helium gas), CIS temperature, vent time and purge time, the cigarette alkaloid compound could be completely thermal desorption, and the volatile alkaloids and coumarin substances were enriched using the cold injection system. A DB-5 MS chromatog. column was used for separation, and a matrix curve external label method was used to quantify the matrix effect under the selected ion monitoring mode (SIM). The results showed that the linear range of 7 kinds of alkaloids and 9 kinds of flavors was 1-500 μg/L, the linear correlation coefficient (R2) was greater than 0.993, and the limits of detection (LOD) and limits of quantitation (LOQ) were 0.02-0.50 μg/kg and 0.1-2.0 μg/kg, resp. This method was simple, safe with high sensitivity and accuracy, and suitable for the determination of alkaloids and flavor compounds in cigarette, which was very important for the anal. of complex volatile trace substances in heated non-burning cigarette.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Recommanded Product: 4-(p-Tolyl)-2,2:6,2-terpyridine. 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: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about Inductive influence of 4′-terpyridyl substituents on redox and spin state properties of iron(II) and cobalt(II) bis-terpyridyl complexes. Author is Chambers, Joseph; Eaves, Bryan; Parker, Danny; Claxton, Ronald; Ray, Partha S.; Slattery, Spencer J..

Iron and cobalt bis-terpyridine (terpy) complexes were prepared [M(R-terpy)2](PF6)2, where M represents Co(II) and Fe(II), and R is the following terpyridine substituents in order of increasing electron-withdrawing behavior [(C4H8)N, BuNH, HO, MeO, p-MeC6H4, H, Cl, MeSO, MeSO2]. The complexes were prepared to investigate the extent of redox and spin state control that is attainable by simply varying the electron donating/withdrawing influence using a single substituent site on the terpyridine ligand. Cyclic voltammetry was used to assess the substituents influence on the M(III/II) redox couple. A plot of the M(III/II) redox potential (E1/2) vs. the electron donating/withdrawing nature of the substituents (Hammett constants), shows a strong linear trend for both metals; however, the substituents have a stronger influence on the Fe(III/II) couple. Solution magnetic susceptibility measurements at room temperature were carried out using standard NMR methodol. (modified Evans method) where all of the Fe(II) complexes exhibited a diamagnetic, low spin (S = 0) behavior. In the cobalt series where R = H for [Co(R-terpy)2]2+, the complex is known to be near the spin cross-over where the room temperature effective magnetic moment (μeff) in solution is ≈3.1 μB; however, the μeff varies between 2.7 and 4.1 μB depending on the R-substituent.

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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI