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Quality Control of 2-(Pyridin-4-yl)-1H-benzo[d]imidazole. 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: 2-(Pyridin-4-yl)-1H-benzo[d]imidazole, is researched, Molecular C12H9N3, CAS is 2208-59-5, about Syntheses, structures and magnetic properties of Co(II) complexes based on H4BTEC and 2-(n-pyridyl)benzimidazole (n = 2, 3, and 4). Author is Xia, Chang-Kun; Lu, Can-Zhong; Yuan, Da-Qiang; Zhang, Quan-Zheng; Wu, Xiao-Yuan; Zhang, Jian-Jun; Wu, Ding-Ming.

The hydrothermal reactions of Co(II) salts with 1,2,4,5-benzenetetracarboxylic acid (H4BTEC) and 2-(n-pyridyl)benzimidazole (n = 2, 3, 4) gave three new coordination complexes, namely, [Co(BTEC)0.5(2-PyBIm)·H2O]·H2O (1), [Co(BTEC)0.5(3-PyBIm)·H2O] (2), [Co(H2BTEC)(4-PyBIm)2]·H2O (3) were studied. The H4BTEC ligands adopt different coordination modes according to the orientation of the pyridyl-substituted benzimidazole. In complex 1, the BTEC4- acts as four-dentate bridging ligand with all carboxylate groups adopt unidentate coordination fashion, leading a two-dimensional coordination network. While in 2, two of the four carboxylate groups adopt chelating bi-dentate coordination mode, and the others demonstrate monodentate coordination fashion; leading a 1-dimensional chain with the nearest Co···Co separation being 5.057 Å. In 3, the adjacent carboxylate groups chelate the Co(II) atom in the monodentate coordination fashion, leading a 1-dimensional undulating chain. Finally, all the complexes are extended into three-dimensional framework via H-bonding as well as π-π interactions. The thermal stabilities and temperature-dependent magnetic susceptibilities for the three complexes were also studied.

Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles

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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: 2208-59-5, is researched, SMILESS is C1(C2=CC=NC=C2)=NC3=CC=CC=C3N1, Molecular C12H9N3Journal, Journal of Physical Chemistry C called Interplay of Hydrophobic and Electrostatic Interactions in Modulation of Protonation-Deprotonation Equilibria of Two Positional Isomers in Their Complexes with Cucurbiturils, Author is Khorwal, Vijaykant; Nudurupati, Uma; Mondal, Sohidul Islam; Datta, Anindya, the main research direction is interplay hydrophobic electrostatic modulation; protonation deprotonation equilibrium positional isomer complex cucurbituril.SDS of cas: 2208-59-5.

Elucidation of host-guest chem. of 2-(4′-pyridyl)benzimidazole (4PBI) and 2-(2′-pyridyl)benzimidazole (2PBI) with cucurbiturils in aqueous solution is rather challenging. The guest mols. are capable of binding in three different states of protonation: cation C, tautomer T, and normal N. Charge distribution on the species governs the formation of the inclusion complexes. Binding modes of the guest mols. with cucurbiturils were investigated by proton NMR spectroscopy. 4PBI binds with its benzimidazole ring pointing inward, while the binding mode is opposite for 2PBI. This difference is governed by the position of substitution of the pyridyl ring. Energetics of complexation was studied by quantum chem. calculations for 4PBI-CB as 2PBI-CB type complexes, for each form (C, T, and N) of both the mols. Release of high energy water from cucurbituril cavity is the main driving force for complexation. Excited state proton transfer (ESPT) in 2PBI and 4PBI are affected strongly upon complexation, as is manifested in steady state and time-resolved fluorescence experiments

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Safety of 2-(Pyridin-4-yl)-1H-benzo[d]imidazole. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 2-(Pyridin-4-yl)-1H-benzo[d]imidazole, is researched, Molecular C12H9N3, CAS is 2208-59-5, about A series of 1D-to-3D zinc coordination polymers based on the rigid aromatic multicarboxylate ligands and different N-donor ligands: Synthesis, structures, and photoluminescent properties. Author is Sun, Wei; Liu, Jingjuan; Liu, Houting; Liu, Zhiliang.

A novel series of zinc coordination polymers, namely, {[Zn(H2btca)(bpt)]·H2O}n (1), {Zn2(btca)(PyBIm)(H2O)}n (2) and {[Zn1.5(Hbtca)(pytpy)]·H2O}n (3), were assembled using zinc nitrates, an conjugated carboxylate ligand H4btca and different N-donor ligands under hydrothermal conditions (H4btca = 1,1′-biphenyl-2,3,3′,5′-tetracarboxylic acid, bpt = 1H-3,5-bis(4-pyridyl)-1,2,4-triazole, PyBIm = 2-(4-pyridyl)benzimidazole, pytpy = 2,4,6-tris(4-pyridyl)pyridine). Single crystal x-ray diffractions conformed that the three compounds are 1-D beaded chain-like structure, 2-D layered network and 3-D porous structures, resp. The diverse architectures are derived from the different N-donor ligands used during the self-assembling process. Elemental anal., IR spectra and luminescence of all the coordination polymers also were studied. The diverse structures display different luminescence properties. This result extends the relation between the structures and luminescence properties.

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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, Polyhedron called Syntheses, structures and luminescent properties of four copper(I) cyanide coordination polymers based on 2-(n-pyridyl)benzimidazole ligands (n = 2,3,4), Author is Wang, Hui; Li, Ming-Xing; Shao, Min; He, Xiang, which mentions a compound: 2208-59-5, SMILESS is C1(C2=CC=NC=C2)=NC3=CC=CC=C3N1, Molecular C12H9N3, Product Details of 2208-59-5.

Four copper(I) cyanide coordination polymers containing 2-(n-pyridyl)benzimidazole ligands, [Cu2(CN)(2-PyBIm)]n (1), [Cu2(CN)2(3-PyHBIm)]n (2), {[Cu3(CN)3(4-PyHBIm)4]·2H2O}n (3) and [Cu5(CN)3(4-PyBIm)2]n (4), were synthesized and characterized by x-ray crystallog. Complex 1 is a one-dimensional coordination polymer in which 2-(2-pyridyl)benzimidazole is deprotonated and adopts a bridging tridentate coordination mode. Complex 2 has ladder-like structure in which 2-(3-pyridyl)benzimidazole does not deprotonate and acts as a bidentate bridge. Complex 3 displays a saddle-shaped helical chain constructed through μ2-cyanide groups and the outstretched neutral 2-(4-pyridyl)benzimidazole monodentate ligands. Complex 4 shows a two-dimension layer polymeric structure in which deprotonated 2-(4-pyridyl)benzimidazole acts as a tridentate bridging ligand. The cyanide groups in four complexes all act as bidentate bridging ligands. These complexes are thermal stable and display luminescence in the solid states.

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Electric Literature of C12H9N3. Aromatic compounds can be divided into two categories: single heterocycles and fused heterocycles. Compound: 2-(Pyridin-4-yl)-1H-benzo[d]imidazole, is researched, Molecular C12H9N3, CAS is 2208-59-5, about Weinreb amide as an efficient reagent in the one pot synthesis of benzimidazoles and benzothiazoles. Author is Bommegowda, Yadaganahalli K.; Lingaraju, Gejjalagere S.; Thamas, Saji; Vinay Kumar, Koravangala S.; Pradeepa Kumara, Challanayakanahally S.; Rangappa, Kanchugarakoppal S.; Sadashiva, Marilinganadoddi P..

One pot synthesis of 2-substituted benzimidazoles/benzothiazoles through condensation is followed by cyclization of Weinreb amide with o-diaminoarene or o-aminothiophenol is reported. In the presence of boron trifluoride etherate in 1,4-dioxane solvent, a high yield (75-94%) was achieved within 60 min. Weinreb amide shows high selectivity in the reaction, even in presence of other active functional groups such as carboxyl, halogen, cyano, and methoxy.

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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: 2-(Pyridin-4-yl)-1H-benzo[d]imidazole( cas:2208-59-5 ) is researched.Name: 2-(Pyridin-4-yl)-1H-benzo[d]imidazole.Liu, Ying-Ying; Wang, Zhao-Xi; He, Xiang; Shao, Min; Li, Ming-Xing published the article 《One unexpected mixed-valence Cu(I,II)-cyanide coordination polymer in situ originating from the cleavage of acetonitrile》 about this compound( cas:2208-59-5 ) in Inorganic Chemistry Communications. Keywords: copper pyridylbenzimidazole cyanide complex preparation mixed valence; thermal stability luminescence copper pyridylbenzimidazole cyanide; crystal structure copper pyridylbenzimidazole cyanide. Let’s learn more about this compound (cas:2208-59-5).

Solvothermal reaction of CuCl2·2H2O and 2-(4-pyridyl)benzimidazole (PyHBIm) in a acetonitrile-water mixed solvent afforded a mixture of [CuI2CuII(CN)2(PyHBIm)2Cl2]n (1) and [CuII(PyH2BIm)2Cl4] (2). Complex 1 is a mixed-valence 1D ribbon Cu(I,II)-cyanide coordination polymer. One Cu(II) center linearly links two Cu(I) ions via two μ2-CN bridges. XPS spectrum and bond valence sum (BVS) anal. have confirmed the mixed-valence characteristics. Cu(II) ion adopts a centrosym. square-planar geometry surrounded by two cyanides and two pyridyl groups. Cu(I) ions adopt a trigonal geometry coordinated by cyanide, imidazole group and Cl- anion. The cyanide ligand is in situ generated from the cleavage of acetonitrile solvent, which indicates that acetonitrile is an environmentally friend cyanating agent. The mechanism of acetonitrile in situ cleavage under solvothermal condition is explained. Complex 2 is a centrosym. mononuclear Cu(II) compound Four equivalent Cl- anions lie on the equatorial plane. The protonated PyH2BIm+ cation as a monodentate ligand coordinates to Cu(II) center via pyridyl terminal.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《2-(4-Pyridyl)benzimidazole-3-carboxylic acid》. Authors are Leko, A. M.; Bastic, B. L..The article about the compound:2-(Pyridin-4-yl)-1H-benzo[d]imidazolecas:2208-59-5,SMILESS:C1(C2=CC=NC=C2)=NC3=CC=CC=C3N1).HPLC of Formula: 2208-59-5. Through the article, more information about this compound (cas:2208-59-5) is conveyed.

cf. C.A. 46, 8655. A mixture of cinchomeronic acid (5.4) and ο-C6H4(NH2)2 (3.3 g.) is heated in a paraffin bath to 200° (20 min.), cooled, and dissolved in Ac2O. After some time a yellow precipitate is formed, which is purified by dissolving in C6H6 and precipitating with light petroleum. It consists of the lactam of 2-(4-pyridyl)benzimidazole-3-carboxylic acid (45%), C13H7ON3, m. 208-9°, which is warmed with 10 mL. of H2O and 1 mL. of 0.25N KOH until the yellow color disappears. Dilute HCl is then added and 2-(4-pyridyl) benzimidazole-3-carboxylic acid (50%), C13H9O2N3, m. 258-9° is precipitated The acid heated in a paraffin bath to 280° gives 2-(4-pyridyl)benzimidazole, m. 214°.

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《2-(Pyrid-4-yl)benzimidazole》. Authors are Bastic, B. L..The article about the compound:2-(Pyridin-4-yl)-1H-benzo[d]imidazolecas:2208-59-5,SMILESS:C1(C2=CC=NC=C2)=NC3=CC=CC=C3N1).Product Details of 2208-59-5. Through the article, more information about this compound (cas:2208-59-5) is conveyed.

A mixture of isonicotinic acid (1.23 g.) and o-C6H4(NH2)2 (1 g.) is heated on a paraffin bath to 250° (20 min.), cooled, and dissolved in dilute HCl; H2O (50 cc.) is added and the solution is made alk. with NH3. The precipitate is filtered off, dissolved in EtOH, and reprecipitated with H2O giving 2-(pyrid-4-yl)benzimidazole (72%), m. 214°.

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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 Excited-State Proton Transfer and Conformational Relaxation of 2-(4′-Pyridyl)benzimidazole in Nafion Films, published in 2016, which mentions a compound: 2208-59-5, Name is 2-(Pyridin-4-yl)-1H-benzo[d]imidazole, Molecular C12H9N3, SDS of cas: 2208-59-5.

The effect of annealing on the acidity and water uptake of Nafion films has been studied by using the acidity sensing fluorophore 2-(4′-pyridyl)benzimidazole (4PBI). The difference in acidity and the microenvironment of the fluorophore in annealed and nonannealed films is brought out in this study. The annealed film is found to have less water uptake than nonannealed films. The amount of water uptake increases upon acid treatment of the films, as all the steady-state and time-resolved behavior of the mol. in nonannealed films is restored. These observations are rationalized by the formation of anhydrides upon annealing and their hydrolysis to sulfonic acid groups upon acid treatment. Interestingly, the acidity of annealed films is found to be even less than that of Na+-exchanged films, indicating that annealing removes more protons from the Nafion films than cation exchange can.

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Name: 2-(Pyridin-4-yl)-1H-benzo[d]imidazole. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 2-(Pyridin-4-yl)-1H-benzo[d]imidazole, is researched, Molecular C12H9N3, CAS is 2208-59-5, about Bis[2-(4-pyridinio)-1H-benzimidazolium] hexacosaoxooctamolybdate(VI). Author is Chen, Li Juan; Xia, Chang Kun; Zhang, Quan Zheng; Lu, Can Zhong.

The title compound was prepared by the hydrothermal method. Crystals of the compound are monoclinic, space group P21/c, with a 11.304(3), b 9.485(3), c 17.835(5) Å, β 97.434(2)°; Z = 2, dc = 2.764; R = 0.043, Rw(F2) = 0.114 for 4335 reflections. The centrosym. β-octamolybdate anions are linked to form a three-dimensional structure by the 2-(4-pyridinio)benzimidazolium cations through N-H···O H bonds.