Relevant bibliographies by topics / Pyridine-Pyrazole

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters

Academic literature on the topic 'Pyridine-Pyrazole'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Pyridine-Pyrazole.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Pyridine-Pyrazole"

1

Senthil Kumar, Kuppusamy, Bernhard Schäfer, Sergei Lebedkin, Lydia Karmazin, Manfred M. Kappes, and Mario Ruben. "Highly luminescent charge-neutral europium(iii) and terbium(iii) complexes with tridentate nitrogen ligands." Dalton Transactions 44, no. 35 (2015): 15611–19. http://dx.doi.org/10.1039/c5dt02186c.

Full text
Abstract:
We report the synthesis and efficient photoluminescence of charge-neutral lanthanide (Ln = Eu3+ and Tb3+) complexes based on pyrazole–pyridine–tetrazole and pyrazole–pyridine–triazole ligands.
APA, Harvard, Vancouver, ISO, and other styles
2

Rao, H. Surya Prakash, Ramalingam Gunasundari, and Jayaraman Muthukumaran. "Crystal structure analysis of ethyl 3-(4-chlorophenyl)-1,6-dimethyl-4-methylsulfanyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylate." Acta Crystallographica Section E Crystallographic Communications 76, no. 3 (February 25, 2020): 443–45. http://dx.doi.org/10.1107/s2056989020002479.

Full text
Abstract:
In the title compound, C18H18ClN3O2S, the dihedral angle between the fused pyrazole and pyridine rings is 3.81 (9)°. The benzene ring forms dihedral angles of 35.08 (10) and 36.26 (9)° with the pyrazole and pyridine rings, respectively. In the crystal, weak C—H...O hydrogen bonds connect molecules along [100].
APA, Harvard, Vancouver, ISO, and other styles
3

Guzei, Ilia A., Teddy T. Okemwa, and Stephen O. Ojwach. "2-[(3,5-Diphenyl-1H-pyrazol-1-yl)methyl]pyridine." Acta Crystallographica Section E Structure Reports Online 68, no. 4 (March 24, 2012): o1190. http://dx.doi.org/10.1107/s1600536812011804.

Full text
Abstract:
The title compound, C21H17N3, crystallizes with the phenyl ring in the 3-position coplanar with the pyrazole ring within 4.04 (5)°, whereas the phenyl ring in the 5-position forms a dihedral angle of 50.22 (3)° with the pyrazole ring. There is no ambiguity regarding the position of pyridine N atom, which could have exhibited disorder between theorthopositions of the ring.
APA, Harvard, Vancouver, ISO, and other styles
4

Hossain, Sayed Muktar, Gourab Kumar Dam, Sagarika Mishra, and Akhilesh Kumar Singh. "A nano-molar level fluorogenic and oxidation state-selective chromogenic dual reversible chemosensor for multiple targets, Cu2+/S2− and Fe3+/F− ions." New Journal of Chemistry 44, no. 35 (2020): 15186–94. http://dx.doi.org/10.1039/d0nj02777d.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Stiborová, Marie, and Sylva Leblová. "Effect of heterocyclic compounds and 2-mercaptoethanol on rape alcohol dehydrogenase." Collection of Czechoslovak Chemical Communications 52, no. 8 (1987): 2107–13. http://dx.doi.org/10.1135/cccc19872107.

Full text
Abstract:
Rape alcohol dehydrogenase (ADH) is inhibited by heterocyclic compounds with a five- to six-membered ring (imidazole, pyrazole, 4-methylpyrazole, 3-methylpyrazole, pyridine, nicotine amide) and by o-phenanthroline, a heterocyclic, polycyclic compound. Pyrazole and its derivatives, imidazole and pyridine, are competitive inhibitors with respect to ethanol. Nicotine amide and o-phenanthroline behave as mixed inhibitors (competitive – noncompetitive) with respect to the substrate. The addition of Zn2+-ions to the reaction medium interferes with the competition by o-phenanthroline. 4-Methylpyrazole and pyrazole are the strongest inhibitors of rape ADH. 2-Mercaptoethanol is an inhibitor of rape ADH which competes with ethanol and the coenzyme. The reversible inhibition by mercaptoethanol changes into the irreversible inactivation of the enzyme. The binding of inhibitors to the zinc atom present in the molecule of rape ADH and the localization of the metal in the enzyme protein have been studied.
APA, Harvard, Vancouver, ISO, and other styles
6

Perrin, Monique, Alain Thozet, Pilar Cabildo, Rosa Ma Claramunt, Eduard Valenti, and José Elguero. "Molecular structure and tautomerism of 3,5-bis(4-methylpyrazol-1-yl)-4-methylpyrazole." Canadian Journal of Chemistry 71, no. 9 (September 1, 1993): 1443–49. http://dx.doi.org/10.1139/v93-186.

Full text
Abstract:
The title compound C12N6H14, 1, crystallizes in the space group P21/n (a = 8.222(2) Å, b = 27.336(8) Å, c = 5.574(2) Å, α = 90.00°, β = 100.97(4)°, γ = 90.00°), Z = 4, d = 1.308 g cm−3. The conformation about the N—C bonds linking the pyrazole rings can be defined as EZ, with "pyridine-like" nitrogen atoms in an anti disposition [Formula: see text] and "pyridine-like" and "pyrrole-like" nitrogen atoms in a syn disposition [Formula: see text] with regard to the central pyrazole. Intermolecular hydrogen bonds between the central and the terminal pyrazole ring of configuration Z form centrosymmetric dimers. They pack in sheets nearly parallel to the (−2 3 1) plane. Its tautomerization barrier has been determined in methanol-d4; the value, 11.9 kcal mol−1, is similar to those of 3,5-dimethyl-4-chloropyrazole (12.8 kcal mol−1) and 3,5-dimethyl-4-nitropyrazole (12.1 kcalmol−1). These values together with the shape of the conformational potential surface (calculated using the AM1 Hamiltonian) suggest that, in compound 1, prototropy and rotation about the N—C bonds linking the three pyrazole rings take place simultaneously.
APA, Harvard, Vancouver, ISO, and other styles
7

Xiang, Shiqun, Xiaofeng Zhang, Hui Chen, Yinghua Li, Weibin Fan, and Deguang Huang. "Copper(ii) facilitated decarboxylation for the construction of pyridyl–pyrazole skeletons." Inorganic Chemistry Frontiers 6, no. 9 (2019): 2359–64. http://dx.doi.org/10.1039/c9qi00599d.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Jochim, Aleksej, and Christian Näther. "Formation of di- and polynuclear Mn(II) thiocyanate pyrazole complexes in solution and in the solid state." Zeitschrift für Naturforschung B 73, no. 11 (November 27, 2018): 793–801. http://dx.doi.org/10.1515/znb-2018-0104.

Full text
Abstract:
AbstractReaction of Mn(NCS)2with pyrazole leads to the formation of three compounds with the compositions Mn(NCS)2(pyrazole)4(1), [Mn(NCS)2]2(pyrazole)6(2) and Mn(NCS)2(pyrazole)2(3). Compound1, already reported in the literature, consists of discrete complexes, in which the Mn(II) cations are octahedrally coordinated by four pyrazole ligands and two terminally N-bonded thiocyanate anions. In compound2each of the two Mn(II) cations are coordinated octahedrally by three pyrazole ligands and one terminal as well as two bridging thiocyanate anions, which link the metal cations into dimers. In compound3also octahedrally coordinated Mn(II) cations are present but they are linked into chainsviacentrosymmetric pairs ofμ-1,3-bridging thiocyanate anions. Upon heating compound1loses the pyrazole co-ligands stepwise and is transformed into the chain compound3viathe dimer2that is formed as an intermediate. Magnetic measurements on compounds2and3reveal dominating antiferromagnetic interactions, as already observed for 1D Mn(NCS)2coordination compounds with pyridine based co-ligands.
APA, Harvard, Vancouver, ISO, and other styles
9

Naskar, Barnali, Kinsuk Das, Ramij R. Mondal, Dilip K. Maiti, Alberto Requena, José Pedro Cerón-Carrasco, Chandraday Prodhan, Keya Chaudhuri, and Sanchita Goswami. "A new fluorescence turn-on chemosensor for nanomolar detection of Al3+ constructed from a pyridine–pyrazole system." New Journal of Chemistry 42, no. 4 (2018): 2933–41. http://dx.doi.org/10.1039/c7nj03955g.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Saha, Sayan, Avik De, Arijit Ghosh, Avik Ghosh, Kaushik Bera, Krishna Sundar Das, Sohel Akhtar, et al. "Pyridine-pyrazole based Al(iii) ‘turn on’ sensor for MCF7 cancer cell imaging and detection of picric acid." RSC Advances 11, no. 17 (2021): 10094–109. http://dx.doi.org/10.1039/d1ra00082a.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Pyridine-Pyrazole"

1

Couchman, Samantha M. "Syntheses and structural studies of complexes of mixed donor pyridine/phenol and pyridine/pyrazole ligands." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299312.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Shumbula, Poslet Morgan. "Pyridine carboxamide and pyrazole palladium(II) complexes as catalyst precursors for phenylacetylene polymerization." Thesis, University of the Western Cape, 2005. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=init_4818_1180438754.

Full text
Abstract:

The objectives of this project were to synthesize and characterise pyridine carboxamide ligands and their palladium complexes and investigate their catalytic activity in the polymerization process of phenylactylene.

APA, Harvard, Vancouver, ISO, and other styles
3

Bedel, Sébastien. "Oligohétérocycles dérivés de la pyridine et du pyrazole : synthèse et application à la photosensibilisation des ions EuIII et TbIII." Toulouse 3, 2004. http://www.theses.fr/2004TOU30079.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Bechara, Ghassan. "Ligands macrocyliques d'ions lanthanide : synthèse et évaluation comme marqueurs luminescents." Toulouse 3, 2010. http://thesesups.ups-tlse.fr/1197/.

Full text
Abstract:
Dans ce travail, nous avons synthétisé et étudié les propriétés photophysiques en milieu aqueux de deux séries de complexes lanthanidiques présentant des durées de vie d'émission particulièrement longues (ordre de la milliseconde), autorisant ainsi des détections résolues dans le temps. La première série porte sur des macrocycles polyazotés de 15 à 21 chaînons intégrant dans leur structure un motif chromophore (mono, bi, tri-hétérocycle) intracyclique permettant d'exalter la fluorescence d'ions lanthanide (Eu3+ et Tb3+) et un motif polyaminocarboxylique (acide triéthylène tétraamine N, N', N", N"'-tétraacétique) assurant la solubilité et la stabilité du complexe lanthanidique en milieu aqueux. La deuxième série concerne des macrocycles dérivés du cyclène (1,4,7,10-tétraazacyclododécane) fonctionnalisé par trois groupements acide acétique et intégrant dans leur structure d'une manière extracyclique un motif chromophore di-hétérocycle N, C- pyridine-pyrazole. L'étude des propriétés de luminescence des complexes Eu3+ et Tb3+ révèle pour certains complexes des rendements quantiques particulièrement élevés (48%), des durées de vie de luminescence longues comprises entre (1 et 3 ms) ainsi qu'une solubilité et stabilité en milieu aqueux autorisant l'utilisation de tels complexes dans différentes applications biologiques et dans la technique de transfert d'énergie par résonance de fluorescence (FRET)
In this work, we synthesized and studied the photophysical properties in aqueous medium of two series of lanthanide complexes showing particularly long-emission lifetimes (in the millisecond range), and allowing a luminescence time-resolved detection. The first series relates to polyazamacrocycles of 15-21 membered ring incorporating in their structure an intracyclic chromophore unit (mono-, bi-, tri-heterocycle) for photosensitizing lanthanide ions (Eu3+ and Tb3+) and a polyaminocarboxylic core (triethylenetetraaminetetraacetic acid) to ensure solubility and stability of lanthanide complexes in aqueous medium. The second series concerns cyclen macrocycles derivatives (1,4,7,10-tetraazacyclododecane) functionalized by three acetic acid groups and incorporating in their structure an extracyclic chromophore unit based on a di-heterocyclic N, C-pyridine-pyrazole-moiety. The study of the luminescence properties of the Tb3+ and Eu3+ complexes reveals for some complexes: particularly high quantum yields (48%), long luminescence lifetimes between 1 and 3 ms, solubility and stability in aqueous media, allowing the use of these complexes in various bioanalytical applications and fluorescence resonance energy transfer (FRET) experiments
APA, Harvard, Vancouver, ISO, and other styles
5

Wu, Li-Lan, and 吳麗嵐. "Application of Phenyl-pyridine Iridium andPhenyl-pyrazole Iridium Complexes in theOrganic Light-emitting Diodes." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/39081281920114273276.

Full text
Abstract:
碩士
國立成功大學
化學系碩博士班
94
New phenylpyridine (pp) compounds have been synthesized. These compounds undergo cyclometalation with iridium trichloride to form iridium (III) complexes which exhibit strong phosphorescence. The photophysical and electrochemical properties of these compounds were investigated. Electroluminescent devices were fabricated from selected iridium complexes. 　　The absorption wavelength of the pp ligands range from 250nm~350nm. The iridium complexes emit blue to green phosphorrescence with wavelength ranging from 452nm~552nm. Most of iridium complexes possess good quantum yields in air-free solution at room temperature. The HOMO (Highest Occupied Molecular Orbital) and LUMO (Lowest Unoccupied Molecular Orbital) energy levels for each complexes were estimated from cyclic voltammetry and absorption spectroscopy date. 　　This thesis has three parts. The first part was studies conjugation length effect the (DBQ)2Ir(acac) exhibit a bathochromic shift at 530nm in comparison with (ppy)2Ir(acac), but a blue shift in comparisons with (DBQ)2Ir(acac). This phenomenon is interesting; possibly that the mixing of the ligand DBQ and Ir center may cause the energy level split up. This effect raises the energy level (T1) of (DBQ)2Ir(acac), and forms larger energy gap (S0→T1). As a result, (DBQ)2Ir(acac) shows a marked blue shift compared to (Bzq)2Ir(acac) in the photoluminescence (PL). The structure of device we used is : ITO/PEDOT:PSS/PBD:PVK+dopant /Ca:Al. Green-emitting devices fabricated from (DBQ)2Ir(acac) exhibit good efficiencies. At a current density of 100 cd/m2, the luminescent efficiency reaches 7.42%, and the maximum brightness of (DBQ)2Ir(acac) was 13800 cd/m2. 　　In the second part, we change the ancillary to alter the HOMO and LUMO of the complexes. These new complexes exhibit a 20nm bathochromic shift with respect to (ppz)2Ir(acac), and an improved quantum yield. 　　 　　In the third part, a series of new phenylpyridine compounds were sythesized. The structure of the device we used is : ITO/2-TNATA/NPB/TCB + 6% dopant/BCP/Alq3/LiF. Blue-emitting device fabricated from BL24. At current density of 100 mA/cm2, the brightness reaches 653 cd/m2, and the maximum brightness can reach 800 cd/m2. Green-emitting device fabricated from BL35. At current density of 10 mA/cm2, the brightness reaches 834 cd/m2, and the maximum brightness can reach 1046 cd/m2.
APA, Harvard, Vancouver, ISO, and other styles
6

Chiu, Chi-wen, and 邱祺文. "Synthesis and Physical Property Studies of Cyclometalated Pt(II) and Pd(II) Complexes with Tridentate Ligand Containing the Pyrazole and Pyridine." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/48909517366321211171.

Full text
Abstract:
碩士
朝陽科技大學
應用化學系碩士班
98
This research mainly aims to synthesize the tridentate ligand which contained a series of new pyrazole and pyridine. With the various apparatuses such as 1H NMR, IR, Mass, and Elemental Analyzer, it’s available to examine its syntheses and characteristics. These chemical compositions could coordinate with metals and further form the organnometallic complexes with phosphorescence. On account of the effects of delocalization, it’s capable of figuring out that the bond length of pyrazole ring C(6)-C(7) is 0.05 Å shorter than the one of normal bond C-C through the crystal structure of chemical composition 8. Because metals limit the configuration, the bond lengths and bond angles of chemical composition 24 are quite different from the ones of composition 8. X-ray also proves that it’s difficult to observe the hydrogen of nitrogen on the pyrazole ring. Through the photoluminescence, there are two absorbing peaks that have been found between 500 to 600nm in the chemical composition 22 and 23. Moreover, there are several absorbing bonds respectively located on 240 to 250nm and 300 to 310nm in the chemical composition 8, 20 and 21（π(L)→π*(L) or n→π*(L) ). Because of the electronic effect of substituent, the red-shift could be resulted on the UV and Radiation spectrum after comparing the electron-withdrawing groups and electron-donating groups. One absorbing bond is also found on the position from 375 to 425nm in the chemical composition 22 and 23, and it is attributed to MLCT (dπ(Pt)→π*(L)).
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Pyridine-Pyrazole"

1

Taber, Douglass. "Preparation of Heteroaromatics." In Organic Synthesis. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199764549.003.0068.

Full text
Abstract:
Masahiro Yoshida of the University of Tokushima described (Tetrahedron Lett. 2008, 49, 5021) the Pt-mediated rearrangement of alkynyl oxiranes such as 1 to the furan 2. Roman Dembinski of Oakland University reported (J. Org. Chem. 2008, 73, 5881) a related zinc-mediated rearrangement of propargyl ketones to furans. The cyclization of aryloxy ketones such as 3 to the benzofuran 4 developed (Tetrahedron Lett. 2008, 49, 6579) by Ikyon Kim of the Korea Research Institute of Chemical Technology is likely proceeding by a Friedel-Crafts mechanism. Sandro Cacchi and Giancarlo Fabrizi of Università degli Studi “La Sapienza”, Roma, observed (Organic Lett. 2008, 10, 2629) that base converted the enamine 5 to the pyrrole 6. Alternatively, oxidation of 5 with CuBr led to a pyridine. Zhuang-ping Zhuan of Xiamen University prepared (Adv. Synth. Cat. 2008, 350, 2778) pyrroles such as 9 by condensing an alkynyl carbinol 7 with a 1,3-dicarbonyl compound. Richard C. Larock of Iowa State University found (J. Org. Chem. 2008, 73, 6666) that combination of an alkynyl ketone 10 with 11 followed by oxidation with I-Cl led to the pyrazole 12. The “click” condensation of azides with alkynes, leading to the 1,4-disubstituted 1,2,3- triazole, has proven to be a powerful tool for combinatorial synthesis. Valery V. Fokin of Scripps/La Jolla and Zhenyang Lin and Guochen Jia of the Hong Kong University of Science and Technology have developed (J. Am. Chem. Soc. 2008, 130, 8923) a complementary approach, using Ru catalysts to prepare 1,5-disubstituted 1,2,3- triazoles. Remarkably, internal alkynes participate, and, as in the conversion of 13 to 15, propargylic alcohols direct the regioselectivity of the cycloaddition. A variety of methods have been put forward for functionalizing pyridines. Sukbok Chang of KAIST described (J. Am. Chem. Soc. 2008, 130, 9254) the direct oxidative homologation of a pyridine N -oxide 16 to give the unsaturated ester 18. Jonathan Clayden of the University of Manchester observed (Organic Lett. 2008, 10, 3567) that metalation of 19 gave an anion that rearranged to 20 with complete retention of enantiomeric excess. Shigeo Katsumura of Kwansei Gakuin University developed (Tetrahedron Lett. 2008, 49, 4349) an intriguing three-component coupling, combining 21, 22, and methanesulonamide 23 to give the pyridine 24.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Pyridine-Pyrazole' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography