Month: November 2022

On August 31, 2007, Varghese, Hema Tresa; Panicker, C. Yohannan; Anto, P. L.; Philip, Daizy published an article.Category: pyridine-derivatives The title of the article was Vibrational spectroscopic studies and ab initio calculations of pyridine-3-sulfonic acid. And the article contained the following:

FT-Raman and FT-IR spectra of pyridine-3-sulfonic acid were recorded and analyzed. The mol. geometry and vibrational wave numbers of pyridine-3-sulfonic acid have been calculated using the Hartree-Fock method with different basis sets. Comparison of the observed fundamental vibrational wavenumbers of pyridine-3-sulfonic acid with calculated results by Hartree-Fock method is found in agreement with the exptl. data. The experimental process involved the reaction of Pyridine-3-sulfonic acid(cas: 636-73-7).Category: pyridine-derivatives

The Article related to pyridinesulfonic acid vibrational spectroscopy ab initio, Physical Organic Chemistry: Absorption, Emission, Reflection, and Scattering Spectra (Ultraviolet and Visible, Infrared and Fourier Transform Infrared, Raman, Microwave, Photoelectron, Fluorescence, Phosphorescence, etc.) and other aspects.Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Lai, Thanh-Loan; Pop, Flavia; Melan, Caroline; Canevet, David; Salle, Marc; Avarvari, Narcis published an article in 2016, the title of the article was Triggering Gel Formation and Luminescence through Donor-Acceptor Interactions in a C3-Symmetric Tris(pyrene) System.Computed Properties of 75449-26-2 And the article contains the following content:

Straightforward modulation of the gelation, absorption and luminescent properties of a tris(pyrene) organogelator containing a C3-sym. benzene-1,3,5-tricarboxamide central unit functionalized by three 3,3′-diamino-2,2′-bipyridine fragments is achieved through donor-acceptor interactions in the presence of tetracyanoquinodimethane. The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Computed Properties of 75449-26-2

The Article related to organogelator gelation uvvis luminescence tcnq donor acceptor, c3 symmetry, donor-acceptor systems, luminescence, organogels, pyrene, Physical Organic Chemistry: Absorption, Emission, Reflection, and Scattering Spectra (Ultraviolet and Visible, Infrared and Fourier Transform Infrared, Raman, Microwave, Photoelectron, Fluorescence, Phosphorescence, etc.) and other aspects.Computed Properties of 75449-26-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Turnbull, William L.; Luyt, Leonard G. published an article in 2018, the title of the article was Amino-Substituted 2,2′-Bipyridine Ligands as Fluorescent Indicators for ZnII and Applications for Fluorescence Imaging of Prostate Cells.Recommanded Product: 75449-26-2 And the article contains the following content:

ZnII concentrations in malignant prostate tissues are much lower than in benign or healthy, suggesting that ZnII levels are a potential biomarker for prostate cancer (PCa). Five 2,2′-bipyridine ligands were synthesized containing amino substituents with varying electron-donating ability for study as fluorescent ZnII indicators. The excited state characteristics of the ligands were explored by UV/visible and fluorescence spectroscopy. 3,3′-Diamino-2,2′-bipyridine (1) was previously shown to be weakly fluorescent as a result of π→π* transitions. The other four ligands have properties consistent with an n→π* intraligand charge transfer excited state. Strongly donating amino and aminophenyl (2 and 4) substituents gave low quantum yields, while weaker donating benzimidazole substituents (6 and 7) gave high quantum yields. Absorption and fluorescence wavelengths underwent bathochromic shifts upon ZnII binding in a majority of cases. Quantum yields drastically increased upon ZnII binding for 1 and 2, but decreased for 4, 6, and 7. Compounds 6 and 7 were incubated with PC-3, DU 145 and BPH-1 cells to determine their ZnII sensing abilities in a biol. system. Weak fluorescence was observed in BPH-1 cells and subsequent incubation with ZnII caused fluorescence intensity to increase. No fluorescence was observed in PCa cell lines. Further study of these ligands may allow for quant. determination of ZnII concentrations in ex vivo tissue samples. The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Recommanded Product: 75449-26-2

The Article related to bipyridine ligand fluorescent indicator zinc fluorescence imaging prostate cell, uv/vis spectroscopy, fluorescence spectroscopy, fluorescent probes, prostate cancer, zinc and other aspects.Recommanded Product: 75449-26-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Wang, Yan-Qin; Tan, Qing-Hua; Liu, Hou-Ting; Wei, -Sun; Liu, Zhi-Liang published an article in 2015, the title of the article was A luminescent europium MOF containing Lewis basic pyridyl site for highly selective sensing of o-, m- and p-nitrophenol.Related Products of 1431292-15-7 And the article contains the following content:

A new luminescent two-dimensional Eu metal-organic framework [Eu6(L)3(HL)2(H2O)10]·10H2O·x(solvent) (1) was successfully prepared by the solvothermal reaction of Eu(NO3)3·6H2O and the multidentate π-conjugated ligand H4L [H4L = (5,5′-(pyridine-2,5-diyl)bis(isophthalic acid))] which has a Lewis basic pyridyl site. The solid sample of 1 emits high bright red light which can be readily observed by the naked eye when excited at 358 nm at ambient temperature The luminescence of finely ground 1 particles dispersed in EtOH can be sensitively and selectively quenched by adding trace amounts of o-, m- and p-nitrophenol (NP), which reveals that 1 can be used as a luminescence sensor for the detection of o-, m- and p-NP. The experimental process involved the reaction of 5,5′-(Pyridine-2,5-diyl)diisophthalic acid(cas: 1431292-15-7).Related Products of 1431292-15-7

The Article related to europium pyridinediylbisisophthalate mof solvothermal preparation crystal structure luminescence, nitrophenol luminescence sensor europium pyridinediylbisisophthalate mof and other aspects.Related Products of 1431292-15-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Funada, Atsushi; Uchikawa, Shota; Hoshino, Norihisa; Takeda, Takashi; Akutagawa, Tomoyuki published an article in 2016, the title of the article was Conformational Transformations of (C12H25NH3+)(Pyridinesulfonate) in the Solid State.Recommanded Product: Pyridine-3-sulfonic acid And the article contains the following content:

The phase-transition behaviors, crystal structures, and dielec. properties of four kinds of simple 1:1 organic salts of (C12H25NH3+)(benzenesulfonate) and (C12H25NH3+)(pyridine sulfonates) were examined from the viewpoint of intermol. hydrogen-bonding interactions and dynamic conformational transformation in mol. assemblies. Crystals of (C12H25NH3+)(benzenesulfonate) and (C12H25NH3+)(3-pyridinesulfonate) were isostructural and solid-solid and solid-liquid-crystal smectic A (SmA) phase transitions were observed These two crystals formed rodlike cation-anion assemblies. However, the two salts, (C12H25NH3+)(2-pyridinesulfonate) and (C12H25NH3+)(4-pyridinesulfonate), formed largely bent L-shaped cation-anion conformations. Interesting conformational transformations from rodlike to L-shaped assemblies were observed in (C12H25NH3+)(2-pyridinesulfonate) and (C12H25NH3+)(3-pyridinesulfonate). The experimental process involved the reaction of Pyridine-3-sulfonic acid(cas: 636-73-7).Recommanded Product: Pyridine-3-sulfonic acid

The Article related to conformational transformation laurylammonium pyridinesulfonate solid state, conformation analysis, dielectric properties, ionic crystals, liquid crystals, phase transitions and other aspects.Recommanded Product: Pyridine-3-sulfonic acid

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On June 30, 2019, Oliveras-Gonzalez, Cristina; Linares, Mathieu; Amabilino, David B.; Avarvari, Narcis published an article.Quality Control of [2,2′-Bipyridine]-3,3′-diamine The title of the article was Large Synthetic Molecule that either Folds or Aggregates through Weak Supramolecular Interactions Determined by Solvent. And the article contained the following:

Weak noncovalent interactions between large disk-like mols. in poorly solvating media generally give fibers where the mols. stack atop one another. A particular chiral spacing group between large aromatic moieties, which usually lead to columnar stacks, in this case gives rise to an intramolecularly folded structure in relatively polar solvents, but in very apolar solvents forms finite aggregates. The mol. that displays this behavior has a C3 sym. benzene-1,3,5-tris(3,3′-diamido-2,2′-bipyridine) (BTAB) core with three metalloporphyrin units appended to it through short chiral spacers. Quite well defined chromophore arrangements are evident by CD spectroscopy of this compound in solution, where clear exciton coupled bands of porphyrins are observed In more polar solvents where the mols. are dispersed, a relatively weak CD signal is observed as a result of intramol. folding, a feature confirmed by mol. modeling. The intramol. folding was confirmed by measuring the CD of a C2 sym. analog. The C3 sym. BTAB cores, that would normally be expected to stack in a chiral arrangement in apolar solvents, show no indication of CD, suggesting that there is no transfer of chirality through it (although the expected planar conformation of the 2,2′-bipyridine unit is confirmed by NMR spectroscopy). The incorporation of the porphyrins on the 3,3′-diamino-2,2′-bipyridine moiety spaced by a chiral unit leaves the latter incapable of assembling through supramol. π-π stacking. Rather, modeling indicates that the three metalloporphyrin units interact thanks to van der Waals interactions, favoring their close interaction over that of the BTAB units. Atomic force microscopy shows that, in contrast to other examples of mols. with the same core, disk like (rather than fibrillar one dimensional aggregates) are favored by the C3 sym. mol. The closed structures are formed through non-directional interlocking of porphyrin rings. The chiral spacer between the rigid core and the porphyrin moieties is undoubtedly important in determining the outcome in polar or less polar solvents, as modeling shows that this joint in the mol. has two favored conformations that render the mol. relatively flat, or convex. The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Quality Control of [2,2′-Bipyridine]-3,3′-diamine

The Article related to preparation zinc porphyrin supramol mol folded aggregate, mol structure zinc porphyrin supramol mol folded aggregate, cd spectra zinc porphyrin supramol mol folded aggregate and other aspects.Quality Control of [2,2′-Bipyridine]-3,3′-diamine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

van Houtem, Michel H. C. J.; Martin-Rapun, Rafael; Vekemans, Jef A. J. M.; Meijer, E. W. published an article in 2010, the title of the article was Desymmetrization of 3,3′-Bis(acylamino)-2,2′-bipyridine-Based Discotics: The High Fidelity of Their Self-Assembly Behavior in the Liquid-Crystalline State and in Solution.Safety of [2,2′-Bipyridine]-3,3′-diamine And the article contains the following content:

Two novel nonsym. disk-shaped mols. 1 and 2 based on 3,3′-bis(acylamino)-2,2′-bipyridine units were synthesized by means of a statistical approach. Discotic 1 possesses six chiral dihydrocitronellyl tails and one peripheral Ph group, whereas discotic 2 possesses six linear dodecyloxy tails and one peripheral pyridyl group. Preorganization by strong intramol. hydrogen bonding and subsequent aromatic interactions induce self-assembly of the discotics. Liquid crystallinity of 1 and 2 was determined with the aid of polarized optical microscopy, differential scanning calorimetry, and X-ray diffraction. Two columnar rectangular mesophases (Colr) have been identified, whereas for C3-sym. derivatives only one Colr mesophase has been found. In solution, the molecularly dissolved state in chloroform was studied with 1H NMR spectroscopy, whereas the self-assembled state in apolar solution was examined with optical spectroscopy. These desymmetrized discotics that lack one aliphatic wedge, behave similar to the sym. parent compound To prove that the stacking behavior of discotics 1 and 2 is similar to that of reported C3-sym. derivatives, a mixing experiment of chiral 1 with C3-sym. 13 has been undertaken, and shown that they indeed belong to one type of self-assembly. This helical J-type self-assembly was further confirmed with UV-vis and photoluminescence spectroscopy. The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Safety of [2,2′-Bipyridine]-3,3′-diamine

The Article related to acylaminobipyridine discotic columnar liquid crystal desymmetrization self assembly, discotic columnar liquid crystal transition enthalpy acylaminobipyridine mol orientation and other aspects.Safety of [2,2′-Bipyridine]-3,3′-diamine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On July 5, 2000, Brunsveld, L.; Zhang, H.; Glasbeek, M.; Vekemans, J. A. J. M.; Meijer, E. W. published an article.Related Products of 75449-26-2 The title of the article was Hierarchical Growth of Chiral Self-Assembled Structures in Protic Media. And the article contained the following:

The location of nine chiral penta(ethylene oxide) side chains at the periphery of a C3-sym. H-bonded extended core gives rise to a thermotropic discotic liquid crystalline material that shows lyotropic phases in polar, protic media f (N,N’,N”-tris{3-[3′-(3,4,5-tris{(2S)-2-(2-{2-[2-(2-methoxyethoxy)ethoxy]ethoxy}ethoxy)propyloxy})benzoylamino]-2,2′-bipyridyl}benzene-1,3,5-tricarbonamide). The mol. stacks self-assemble in a reversible and hierarchical fashion, and specific and subtle solvent-mol. interactions together with the created hydrophobic microenvironment account for an unprecedented stabilization of a preferred handedness of the helical stacks by cooperative intermol. interactions. The presence of either chirality or achirality at the supramol. level in the stacks can be tuned by temperature and solvent as judged from CD spectroscopy. A hierarchical growth of the self-assembly is revealed using a variety of spectroscopic techniques and DSC. The experimental process involved the reaction of [2,2′-Bipyridine]-3,3′-diamine(cas: 75449-26-2).Related Products of 75449-26-2

The Article related to self assembly chiral structure protic media lyotropic liquid crystal, discotic liquid crystal methoxyethoxyethoxyethoxyethoxypropyloxybenzoylaminobipyridylbenzenetricarbonamide and other aspects.Related Products of 75449-26-2

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On October 12, 1977, Schmidtchen, Franz P.; Rapoport, Henry published an article.Reference of 2-Bromo-5,6-dimethoxy-3-methylpyridine The title of the article was Polyprenylpyridinols. Synthesis of piericidin analogs. And the article contained the following:

The piericidin A analogs I (n = 1, 2, 3, 9) and II were prepared for structure-activity studies on coenzyme Q inhibitors. To prepare the nucleus, 3-methoxyacetylamino-2-methylacrylonitrile was cyclized to a 4-amino-2-pyridone which Me3O+ BF4- converted to the 4-amino-2,3-dimethoxypyridine. Bromination of the acylated amine formed the 6-bromo derivative in which the 4-amino group was then replaced by hydroxy and the latter blocked by conversion to its benzyl ether with a benzylisourea. Transmetalation now gave the 6-lithio compound which was coupled with various prenyl bromides, leading to introduction of all trans polyprenyl side chains. The final 4-pyridinols were formed on selective debenzylation with butyl mercaptide. All the polyprenylpyridinols inhibited coenzyme Q electron transport to some extent, with the farnesyl analog having the same activity as piericidin A. The experimental process involved the reaction of 2-Bromo-5,6-dimethoxy-3-methylpyridine(cas: 64837-91-8).Reference of 2-Bromo-5,6-dimethoxy-3-methylpyridine

The Article related to piericidin a analog synthesis, pyridinol polypropenyl, prenylpyridinol preparation coenzyme q inhibitor, coenzyme q inhibitor, polyprenylpyridinol preparation coenzyme inhibitor and other aspects.Reference of 2-Bromo-5,6-dimethoxy-3-methylpyridine

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

On May 7, 1995, Baker, Paul K.; Jenkins, Alyn E.; Lavery, Aidan J.; Muldoon, David J.; Shawcross, Andrew published an article.Application of 636-73-7 The title of the article was The synthesis of the first examples of water-soluble seven-coordinate complexes of tungsten(II). And the article contained the following:

Reaction of the seven-coordinate complex [WI2(CO)3(NCMe)2] with two equivalent of 4-HO2CC5H4N in MeOH at room temperature gave the bis(pyridine-4-carboxylic acid) complex [WI2(CO)3(4-HO2CC5H4N)2] (1) in good yield, which, upon treatment with two equivalent of NaOH in EtOH, afforded the completely water soluble complex [WI2(CO)3(4-NaO2CC5H4N)2] (2) in good yield; reaction of the latter with an equimolar amount of 3-NaO3SC5H4N yielded [WI2(CO)3(4-NaO2CC5H4N)(3-NaO3SC5H4N)], which represents the 1st room-temperature ligand-substitution reaction in H2O of a metal carbonyl complex. The experimental process involved the reaction of Pyridine-3-sulfonic acid(cas: 636-73-7).Application of 636-73-7

The Article related to tungsten water soluble seven coordinate complex, pyridinecarboxylate tungsten dinuclear carbonyl complex, pyridinesulfonate pyridinecarboxylate tungsten dinuclear carbonyl complex and other aspects.Application of 636-73-7

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem