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Journal articles on the topic 'Keywords: Pyridines'

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Published: 7 June 2025

Last updated: 2 August 2025

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1

Werstiuk, Nick Henry, and Chen Ju. "Protium–deuterium exchange of substituted pyridines in neutral D2O at elevated temperatures." Canadian Journal of Chemistry 67, no. 1 (1989): 5–10. http://dx.doi.org/10.1139/v89-002.

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H–D exchange of a series of pyridines 1–15, 10H-pyridino[3,2-b][1,4]benzothiazine (16), phenothiazine (17), and aniline has been carried out in neutral D2O at elevated temperatures. The substrates undergo selective exchange and are generally isolated in good yield. Cyanopyridines 4,5, and 6 hydrolyze readily in D2O at elevated temperatures, and the resultant carboxylic acids decarboxylate. This reaction provides a convenient one-step route to selectively labelled pyridines. Possible mechanisms of exchange are presented. Keywords: protium–deuterium exchange, substituted pyridines, temperature e

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2

Dr.N.Sandeepthi, Nellutla Jhancy Laxmi* Kummari Eshwaramma. "FORMULATION AND OPTIMIZATION OF FLOATING LIPID BEADS OF RUPATADINE FOR THE ENHANCED BIOAVAILABILITY AND ITS PHARMACOKINETIC APPLICATIONS." INDO AMERICAN JOURNAL OF PHARMACEUTICAL SCIENCES 05, no. 11 (2018): 11686–97. https://doi.org/10.5281/zenodo.1480948.

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<em>The development of oral drug delivery systems for poorly soluble basic drugs is problematic because of their pH dependent solubility. Poorly water soluble basic drugs are very sensitive to pH changes, and following oral administration and dissolution in the acidic stomach environment, they tend to precipitate upon gastric emptying to higher pH medium in the intestine, leading to compromised or erratic oral bioavailability. Rupatadine is a second-generation antihistamine, long-acting histamine antagonist, with selective peripheral H1-receptor antagonist activity. Some of the metabolites (de

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3

Devi, Sushma, Ankita Sharma, Veeresh Karoshi, Sunil Kumar, Ajay Kumar, and Jayant Sindhu. "Metal-Free Synthesis of 2-Aminothiazole Functionalized Imidazo[1,2-a]pyridines as Antibacterial Agents." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 34, no. 01 (2024): 23. http://dx.doi.org/10.59467/ijhc.2024.34.23.

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The present work describes the synthesis, characterization, and in silico studies of some new 2-aminothiazole functionalized imidazo[1,2-a]pyridines (1a-h). The targeted compounds were synthesized by the Hantzsch?s thiazole reaction involving the condensation reaction of a-bromomethyl ketones with 1-(3-nitroimidazo[1,2-a]pyridin-2-yl)thiourea (2). The key precursor 2 was synthesized by four steps method using 2-aminopyridine and chloroacetic acid as commercially available starting materials. The synthesized compounds 1a-1h displayed considerable activity against Gram-positive bacteria. In part

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4

Anantwad, Santosh A., Amol R. Suryawanshi, and Prof.Hussain Sayyed. "Two-step One-Pot Multicomponent Reaction Improved by TBAF for the Preparation of 2-Amino-3, 5-dicyano-4-aryl-6-phenylsulfanylpyridines." International Journal of Advance and Applied Research 12, no. 2 (2024): 196–99. https://doi.org/10.5281/zenodo.14644129.

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<strong>Abstract:</strong>     To further explore TBAF's catalytic properties, a study investigated its role in the synthesis of 2-amino-3, 5-dicyano-4-aryl-6-sulfanyl-pyridines under mild conditions. Two-step One-Pot Multi-component reaction (MCR) synthesis of pyridines derivatives using TBAF as the catalyst was conducted across different organic solvents. The formation of 1a was observed in polar solvents like methanol, acetonitrile, dimethylformamide (DMF), and ethanol, with ethanol yielding the highest yield (91%). Notably, the absence of TBAF led to no product formatio

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5

Cativiela, C., and J. I. Garcia. "Electronic effects of heterocyclic substituents. Spectroscopical and theoretical (AM1) study in a series of heterocyclic carboxaldehydes." Canadian Journal of Chemistry 68, no. 9 (1990): 1477–81. http://dx.doi.org/10.1139/v90-226.

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The electronic effects of a series of 18 heterocyclic carboxaldehydes (furans, thiophenes, pyrroles, and pyridines) have been studied by means of the correlation existing between 13C chemical shifts of the carbonylic carbon and calculated total and π charges (AM1). The implications of this theoretical model to explain polar and resonance contributions to the total electronic effect are discussed. Keywords: heterocyclic substituents, electronic effects, 13C NMR, DSP models.

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6

Hanan, Garry S., Ulrich S. Schubert, Dirk Volkmer, et al. "Synthesis, structure, and properties of oligo-tridentate ligands; covalently assembled precursors of coordination arrays." Canadian Journal of Chemistry 75, no. 2 (1997): 169–82. http://dx.doi.org/10.1139/v97-020.

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Oligo-tridentate ligands based on alternating pyridines and pyrimidines were synthesised by Stille-type carbon–carbon bond-forming reactions. The terpyridine-like sites are designed to coalign upon metal complexation, giving rise to organized and rigidly spaced metal ions. Peripheral functionalization of the basic bis-tridentate framework was explored. The heterocycles in the ligands are in an all-trans conformation about the interannular bonds as indicated by comparison of their 1H NMR spectra. An X-ray crystal structure analysis of the nonchiral tris-tridentate ligand 2a reveals a helical st

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7

Pearson, Céline, and André L. Beauchamp. "1H NMR study of paramagnetic rhenium(III) monomers with nitrogen heterocycles. Crystal structures of ReCl3L2(PPh3) complexes (L = pyridine, 3-picoline, and 1-methylimidazole)." Canadian Journal of Chemistry 75, no. 2 (1997): 220–31. http://dx.doi.org/10.1139/v97-026.

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Rhenium(III) monomers of the type ReCl3Ln(PPh3)3−n, where n = 1,2, and 3, were prepared for simple nitrogen heterocyclic ligands L and characterized mainly by 1H NMR and IR spectroscopies. Most of the 1H NMR signals of these paramagnetic compounds were assigned by using methylated pyridines. A mer-cis octahedral geometry slightly distorted by triphenylphosphine was determined by X-ray diffraction for three ReCl3L2(PPh3) complexes: L = pyridine, triclinic, [Formula: see text], a = 11.379, b = 13.532, c = 18.160 Ǻ, α = 80.16°, β = 89.57, γ = 86.27°, Z = 4, R = 0.076; L = 3-picoline, triclinic, [

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8

Jahangir, Jian Wang, Richard W. Smith, David B. MacLean, and Herbert L. Holland. "Oxidation products of 5-ethenyl-4-methyl-3-pyridinecarbonitrile and 2- and 4-methylpyridines." Canadian Journal of Chemistry 68, no. 4 (1990): 587–91. http://dx.doi.org/10.1139/v90-090.

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The anion of 5-ethenyl-4-methyl-3-pyridinecarbonitrile 1 undergoes oxidative coupling on treatment with dibenzoyl peroxide affording 1,2-bis-(5′-ethenyl-3′-cyano-4′-pyridyl)-ethane, 2. It is also shown that the anions of 2- and 4-methylpyridine undergo oxidative coupling. In the latter case, however, the coupling reaction is accompanied by addition to the carbonyl group of dibenzoyl peroxide. The addition products have been identified as phenacyl pyridines and dipicolyl phenyl carbinols. The ethenyl side chain of 1 has been hydrated by way of the oxymercuration–reduction process and the second

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9

Gasparyan, H. V., S. A. Buloyan, A. E. Pogosyan, et al. "Pathological investigation of neuroprotective activity of new derivatives of fused pyrazolyl-thienopyridines in Corazol-induced seizures." CLINICAL AND EXPERIMENTAL MORPHOLOGY 10, no. 4 (2021): 53–62. http://dx.doi.org/10.31088/cem2021.10.4.53-62.

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Introduction. Seizures provoke several morphological alterations in the brain structures. These alterations are primarily located in the hippocampal CA1 region and the entorhinal cortex. Recurrent seizures are common in patients with epilepsy. Therapeutic options for this disease are very limited and most of them are aimed at relieving symptoms. In most cases, to treat epilepsy, anti-seizure drugs are used. Nevertheless, one-third of affected individuals have resistance to them. Thus, the study of new effective agents that can prevent epileptogenesis is still an ongoing challenge. In this work

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10

Bunting, John W., James P. Kanter, Raymond Nelander та Zhennan Wu. "The acidity and tautomerism of β-diketones in aqueous solution". Canadian Journal of Chemistry 73, № 8 (1995): 1305–11. http://dx.doi.org/10.1139/v95-161.

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The acidity and keto–enol tautomerism of a series of symmetrical β-diketones (RCOCH2COR (1): R = methyl (a), phenyl (b), 3-pyridinyl (c), 4-pyridinyl (d), 3-(N-methyl)pyridinio (e), and 4-(N-methyl)pyridinio (f)) and two series of unsymmetrical β-diketones (RCOCH2COCH3 (7a–7f) and RCOCH2COC6H5 (8a–8f)) have been investigated in aqueous solution at 25 °C and ionic strength 0.1. Values of [Formula: see text] were measured spectrophotometrically, and the acidities of the enols [Formula: see text] were obtained from the analysis of the pH dependence of the buffer catalysis for the general acid-cat

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11

King, James Frederick, Sheena May Loosmore, John Henry Hillhouse, and Kishan Chand Khemani. "Vinylogous nucleophilic catalysis. The tertiary amine promoted reaction of ethenesulfonyl chloride with alcohols." Canadian Journal of Chemistry 67, no. 2 (1989): 330–34. http://dx.doi.org/10.1139/v89-054.

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Ethenesulfonyl chloride (1) reacts with alcohols in the presence of tertiary amines to give a mixture of the alkyl ethenesulfonate (5) and the alkyl betylate (R3′N+CH2CH2SO2OR Cl−). With pyridine and neopentyl alcohol the product composition from the reaction of 1 is identical to that from the pyridinio-sulfonyl chloride (9). These results, when taken with experiments with deuterium labelled reagents, lead to the conclusion that the major (~80%) reaction pathway involves conversion of 1 or 9 to the sulfene 8, which reacts with the alcohol to form 5 or the betylate, and hence vinylogous nucleop

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12

Najar, Adel M., Ruwida M. K. Omar, Eman Bobtaina, et al. "Design, Synthesis, Pharmacological Evaluation and DFT Investigation of New Bioactive Unsymmetrical Bi-Functional Ligand." Journal of Drug Delivery and Therapeutics 12, no. 4 (2022): 73–80. http://dx.doi.org/10.22270/jddt.v12i4.5429.

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Compounds with more than one bioactive motif become of great interest. In this regard, a new tridentate 1,2-unsymmetrical ligand consists of flexible and rigid bioactive arms spaced by benzene ring in an ortho position designed to form a bifunctional molecule. The 2-((3-(pyridin-2-yl)-1H-pyrazol-1-yl)methyl)benzonitrile (PPMB) synthesized under phase transfer reaction and characterized using 1H-NMR and mass spectroscopy and studied as potent kinase inhibitors. Theoretically, the molecule structure was investigated at the B3LYP/6-311++G(d,p) level of theory in the gas phase and revealed that al

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13

Narayana, V. V. P. C., K. Sajitha, V. Bala Yesu, et al. "Synthesis of some new pyridine-acetamide hybrids as potential antibacterial and antioxidant agents." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 35, no. 02 (2025): 237. https://doi.org/10.59467/ijhc.2025.35.237.

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The present study reports the synthesis of two new series of pyridine-acetamide hybrid derivatives, 6a-e and 13a-e and their evaluation of antibacterial and antioxidant properties. The synthesis involved acylating pyridinylamines with chloroacetyl chloride to form corresponding 2-chloro-N-pyrdinylacetamides, which were then reacted with various secondary amines to yield pyridine-acetamide hybrid derivatives. Compounds 6b and 6e showed the highest efficacy comparable to the standard antibiotic, azithromycin. Compound 6b showed the highest antioxidant potential, with IC50 of 66.2 μg/mL and compo

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14

Gündüz, Turgut, Esma Kiliç, Mustafa Tastekin, and Güleren Ozkan. "Conductimetric titrations of symmetrical aliphatic dicarboxylic acids in solvents pyridine and pyridine–benzene mixtures." Canadian Journal of Chemistry 68, no. 3 (1990): 431–34. http://dx.doi.org/10.1139/v90-065.

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Nine symmetrical aliphatic dicarboxylic acids, namely oxalic, malonic, succinic, glutaric, adipic, pimelic, suberic, azelaic, and sebacic acids, were titrated conductimetrically with tetrabutylammonium hydroxide in pyridine and pyridine–benzene mixtures ((2 + 1), (1 + 1), (1 + 2), (1 + 3), and (1 + 4)). Titration curves of the acids exhibited two distinct and stoichiometric end-points in media of dielectric constants 13.5, 10.0, 8.2, 6.3, 5.3, and 4.7, respectively. The closer investigations of the titration curves revealed that three factors mainly influence the shapes of the titration curves

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15

Sugiyarto, Kristian H. "STRUCTURAL STUDY OF BIS(2,6-BIS(PYRAZOL-3-YL)PYRIDINE)NICKEL(II) BY CALORIMETRY AND EXAFS SPECTROMETRY." Indonesian Journal of Chemistry 3, no. 2 (2010): 74–79. http://dx.doi.org/10.22146/ijc.21889.

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The main aim of this work is to reveal the complex formation of 2,6-bis(pyrazol-3-yl)pyridine, bpp, with nickel(II) perchlorate in DMF by calorimetric stepwise complex formation and then followed by EXAFS spectrometry. It was found that the complex formation follows two stepwise pathways namely the formation of mono pyrazolyl-pyridine, [Ni(DMF)3 bpp]2+, and bis pyrazolyl-pyridine, [Ni(bpp)2]2+; the formation constants being log β1 = 6.57, and log β2 = 5.02, and the total value of log β = 11.58. The final formation of six-coordinated compound was confirmed by EXAFS analysis with the mean Ni-Nbp

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16

Ammilal, Rao, Kumar Ganesh, and Singh Neha. "EDAS and TOPSIS based Estimation of Oxidation of Methionine by Cr(VI) Reagents." Indian Journal of Science and Technology 14, no. 43 (2021): 3190–98. https://doi.org/10.17485/IJST/v14i43.1508.

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<strong>Objectives:</strong> To find the suitable solvent for the oxidation of methionine by Cr(VI) reagents using EDAS and TOPSIS method. <strong>Methods:</strong> When methionine oxidized by Cr(VI) complexes i.e. tetrakis(pyridine)silver dichromate (TPSD), quinolinium bromochromate (QBC), tetraethylammonium chlorochromate (TEACC) and quonilinium chlorochromate (QCC) formation of corresponding sulfoxide take place. Reaction performed in chloroform (CF), 1,2- dichloroethane (DCE), dichloromethane (DCM), dimethylsulphoxide (DMSO) and acetone solvents.<strong> Findings:</stro

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17

García-Ponce, L., L. Moreno-Real, and A. Jiménez-López. "Intercalation of basic molecules into niobyl-vanadyl phosphate." Canadian Journal of Chemistry 68, no. 4 (1990): 592–96. http://dx.doi.org/10.1139/v90-091.

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Mixed niobyl-vanadyl phosphate (V0.14Nb0.86)OPO4•2.7H2O, VNbP, is a moderately acid solid that intercalates strong basic molecules such as branched alkylamines, allylamine, cyclohexylamine, piperidine, and diethylamine, giving rise to bilayers of inclined molecules. In the case of molecules of medium basicity, such as pyridine, the intercalated amounts are small at room temperature and they present a planar orientation. A special behaviour was found with ethylenediamine and butylenediamine, strong basic diamines, which also present a planar disposition in the interlayer space. Keywords: mixed

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18

Parmar, Rahul V., Milan S. Vadodaria, and Prashant S. Gajera. "Click Chemistry; Inspired Synthesis and Antimicrobial Evaluation of 1,2,4-triazolo [4,3-a]pyridine linked 1,4-disubstituted 1,2,3-triazole Derivatives with Amide Functionalities." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 34, no. 02 (2024): 195. http://dx.doi.org/10.59467/ijhc.2024.34.195.

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In an attempt to rationalize the search for new potential antimicrobial agents, a new series of 1,2,4-triazolo[4,3-a] pyridine linked 1,4-disubstituted 1,2,3-triazoleswith amide linkage has been synthesized by the cyclization of 1,2,4-triazolo[4,3-a]pyridine-based alkynes and 2-azido N-phenylacetamide in the presence of CuSO4 as catalyst through ??Click Chemistry" approach. The newly synthesized scaffolds have been evaluated for their antimicrobial potential using eight microbial strains such as Escherichia coli, Pseudomonas aeruginosa, Enterobacter aerogenes, Bacillus megaterium, Staphylococc

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19

Al-anber, M. J. "Theoretical Ab initio and Density Functional Study of the Hydrogen Bonding Nature Between the Pyridine-nitrogenic Base Pairs." Journal of Scientific Research 4, no. 2 (2012): 419. http://dx.doi.org/10.3329/jsr.v4i2.8721.

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The pyridine interact with two nitrogenic bases (adenine and uracil) so that they may cause a significant point mutation. The results of theoretical ab initio study on the hydrogen bonding energies of pyridine with the adenine and uracil are reported. The geometries of the local minima for all suggested cases were optimized with Restricted Hartree-Fock RHF/cc-pVDZ and then density functional B3LYP/cc-pVDZ. The geometrical parameters, relative stability, interaction energies and nature of hydrogen bonding energy are reported. Also, focus on the range of the hydrogen bonding energy and the flexi

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20

Yang, Chi-Ming, and Dennis D. Tanner. "A simple synthesis of (±)-1,2,3,6-tetrahydro-2,3′-bipyridine (anatabine) and (±)-3-(2-piperidinyl)pyridine (anabasine) from lithium aluminum hydride and pyridine." Canadian Journal of Chemistry 75, no. 6 (1997): 616–20. http://dx.doi.org/10.1139/v97-073.

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The hydrolysis of a pyridine solution of lithium tetrakis(N-dihydropyridyl)aluminate (LDPA), which was prepared at 0 °C, yields a mixture of 1,4-, 1,2-, and 2,5-dihydropyridines (DHPs) in a ratio of 26:37:38. The subsequent reversible base-catalyzed condensation of a 1:1 mixture of 1,2- and 2,5-DHPs carried out in the presence of oxygen affords an 89% yield of (±)-anatabine. When the reaction mixture is allowed to stand in the presence of oxygen, anabasine is slowly formed from anatabine by the reaction of the residual DHPs. Anatabine can also be converted into (±)-anabasine by catalytic hydro

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21

Prajapati, Krupa, Vikas Desai, Riki Tailor, Bhadresh Sudani, Priyank Mistry, and Jignesh Pandya. "Molecular hybridization of pyridine-thiophene clubbed isoxazole heterocycle in a single entity: Synthesis, antimicrobial, antitubercular, molecular docking and ADMET analysis." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 34, no. 03 (2024): 345. http://dx.doi.org/10.59467/ijhc.2024.34.345.

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In the present study, 10 new hybrid pyridine-thiophene clubbed isoxazole derivatives (8a-j) were synthesized from the reaction of benzylideneacetophenones (7a-j) with hydroxylamine hydrochloride in alkaline medium. The synthesized compounds were tested for in vitro antimicrobial and antitubercular properties. Four promising new lead compounds such as 8c, 8d, 8f, and 8h endowed with excellent antimicrobial and antitubercular activity. In addition, the docking score for the most active compounds 8b, 8e, 8g, and 8h was found to be -8.6 to -8.8 kcal/mol demonstrating its favorable accommodation wi

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22

Balasanmugam, K., J. S. Hartman, J. M. Miller, and Z. Yuan. "Gas phase ligand substitution reactions in fast atom bombardment mass spectrometry: effects of ligand base strength and choice of matrix liquid in substitution reactions of difluoroborn cations." Canadian Journal of Chemistry 67, no. 4 (1989): 685–88. http://dx.doi.org/10.1139/v89-104.

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Strongly basic amidine and guanidine ligands displace weaker-base ligands such as pyridine from D2BF2+ complexes in the gas phase in Fast Atom Bombardment mass spectrometry. The choice of protic vs. aprotic matrix liquid inhibits or promotes gas phase ligand substitution reactions. Keywords: ligand substitution, difluoroboron cations, FABMS.

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23

Oliynik, T. M., R. B. Kovbasenko, A. P. Dmitriev, and P. G. Dulniev. "Possible replacement of cytokinins and auxins in culture in vitro." Faktori eksperimental'noi evolucii organizmiv 25 (August 30, 2019): 293–97. http://dx.doi.org/10.7124/feeo.v25.1180.

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Aim. To perform an analysis of the effectiveness of our proposed modification of the classical MS medium in which auxin and cytokinin are replaced by derivatives of the class of tetrahydrothio-fendioxide and pyridine. Methods. In this study, the work with cell culture in vitro, in particular aseptic sprouting of seeds, microclonal reproduction, callusogenesis and initiation of various types of morphogenesis was carried out according to known techniques. Two varieties of potatoes (Slovyanka, Lugovskaya) and two varieties of tomato (Lagidny, Bobrytsky) were used to induce somaclonal variability.

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24

Mahnashi, Mater H., B. H. Prabhanjana, Sudarshan Seetammanavar, et al. "Synthesis and in silico studies of some new Schiff bases as antimicrobial and antitubercular agents." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 35, no. 01 (2025): 141. https://doi.org/10.59467/ijhc.2025.35.141.

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Ten pyridine carbohydrazide Schiff bases (3a-3e) and (5a-5e) were synthesized by refluxing pyridine carbohydrazides 1 and 4 with different ketones in the presence of ethanol and a few drops of glacial acetic acid. The synthesized compounds were biologically screened for antitubercular and antibacterial activity studies. The fit of these compounds within the active sites of the dihydrofolate reductase (DHFR) and enoyl ACP reductase was evaluated using molecular modeling techniques. The findings of the anticipated ADMET investigation showed that the compounds with the given names have drug-like

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Zilberman, Galit, Vladimir Tsionsky, and Eliezer Gileadi. "Response of the EQCM to specific adsorption on gold electrodes: adsorption of pyridine and benzene." Canadian Journal of Chemistry 75, no. 11 (1997): 1674–79. http://dx.doi.org/10.1139/v97-199.

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The electrochemical quartz crystal microbalance (EQCM) is used to study adsorption of pyridine and benzene on gold. The most important result observed is that thefrequencyincreaseswhentheorganicmoleculeisadsorbed, namely, the total mass of the species rigidly adsorbed is reduced as a result of adsorption. This is consistent with the accepted idea that electrosorption is a replacement reaction, in which a number of water molecules are replaced from the interface for each organic molecule adsorbed. However, this is the first time, to the best of our knowledge, that it has been observed experimen

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Rahul, P. Thummar* Ronak D. Kamani Nirav H. Sapariya Beena K. Vaghasiya Jemin R. Avalani and Dipak K. Raval. "NOVEL PENTA- SUBSTITUTED PYRIDINE NUCLEUS WITH PYRAZOLE ANALOGUES: MICROWAVE ASSISTED SYNTHESIS, DOCKING AND BIOLOGICAL SCREENING." Indo American Journal of Pharmaceutical Sciences 05, no. 01 (2018): 74–84. https://doi.org/10.5281/zenodo.1135277.

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A novel series of 5-(4-formyl substituted phenoxy)-3-methyl-1-phenyl-1H-pyrazole-4-carbonitrile (1a-b) based penta-substituted pyridine derivatives 4(a–n) was synthesized by piperidine catalyzed cyclocondensation reaction through microwave. The newly synthesized compounds were characterized by spectral studies and also by C, H and N analyses. The synthesized compounds were tested for their in vitro tuberculosis activity against H37Rv strains using rifampicin, isoniazide and ethambutol as the standard drugs. All novel synthesized compounds were tested for their in vitro antimalarial activ

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Punte, G., B. E. Rivero, S. Cerdeira, and N. S. Nudelman. "Structure of 2-methoxy-3,5-dinitropyridine." Canadian Journal of Chemistry 68, no. 2 (1990): 298–301. http://dx.doi.org/10.1139/v90-041.

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2-Methoxy-3,5-dinitropyridine, C6N3O5H5, crystallizes in the monoclinic system, space group P21/n, with cell parameters a = 7.496(5), b = 18.38(1), c = 6.068(2) Å, β = 77.18(4)°, V = 815(1) Å3, and four molecules per unit cell. Its structure was solved by direct methods and refined by least-squares procedures to a final R = 4.99%, Rw = 5.42%, for 753 observed independent reflections. The molecule is not planar, a rotation of the methoxy and 3-nitro groups out of the pyridine ring (7° and 16°, respectively) is observed. The methoxy group is located syn to the ring nitrogen atom to avoid repulsi

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28

Likhomanova S.V. and Kamanina N.V. "The intermolecular interaction influence on non-linear optical properties in COANP-carbon nanoparticles system." Technical Physics Letters 48, no. 2 (2022): 70. http://dx.doi.org/10.21883/tpl.2022.02.52853.18990.

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The main results of non-linear optical, spectral and current-voltage characteristics research of pyridine organic conjugated molecule-carbon nanoparticles combined system have been presented. The perspective of these materials further study in global trends of modern search of materials for optical limiting has been demonstrated also in the present paper. Keywords: fullerenes, charge transfer complex, optical limiting, organic conjugated molecules

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29

Guo, Yuting, Xinyu Hao, Ying Wang, and Lei Guan. "Syntheses, Structures, and Properties of Five Coordination Compounds Based N-Heterocyclic Ligands." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 34, no. 02 (2024): 229. http://dx.doi.org/10.59467/ijhc.2024.34.229.

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Five coordination compounds based on 2,6-dihydroxypyrimidine-4-carboxylic acid (H3pymca), Ni2(Hpymca)2(bipy)(H2O)6?2H2O (1), Co2(Hpymca)2(bipy)(H2O)6?2H2O (2), Ni(Hpymca)(pya)(H2O)2 (3), Zn(Hpymca)(pyrapyri)(H2O)?H2O (4), and [Ba(H2pymca)2]n (5) (bipy = 4,4'-bipyridine, pya = pyridine-2-aldoxime, pyrapyri = 2-(1H-pyrazol-3-yl)pyridine) have been synthesized by hydrothermal methods and structurally characterized. The structure analyses showed that compounds 1 and 2 are isostructural with triclinic, P-1 space group, where the bipy molecule bridges with two metal ions, and Hpymca2- anions serve a

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30

Ifeanacho, Ezetonu Abireh, Christian Ejuiwa Mba, and Chiadikobi Lawrence Ozoemena. "ACUTE NICOTINE & PYRIDINE-3-CARBOXYLIC ACID SYNERGY PROTECTS NICOTINE INDUCED TESTICULAR DEGENERATION AND MODERATES MALONDIALDEHYDE LEVELS." International Journal of Novel Research in Healthcare and Nursing 11, no. 1 (2024): 125–30. https://doi.org/10.5281/zenodo.10612811.

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<strong>Abstract:</strong><em> </em>Nicotine is a naturally produced alkaloid in the Solanaceae family of plants, widely used as a recreational substance or an anxiolytic and acts as a receptor agonist at most nicotinic acetylcholine receptors (nAChRs). Pyridine 3-carboxylic acid is a monocarboxylic derivative of pyridine. Also known as niacin, it is a water-soluble vitamin that is indispensable in the diet of humans and animals and has a variety of important applications, such as in matrices for matrix-assisted laser desorption ionization (MALDI) mass spectrometr

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31

Gaude, Didier, Gisèle Gellon, Raymond Le Goaller, and Jean-Louis Pierre. "Influence de la complexation sur la réactivité de nitrates d'halogènes." Canadian Journal of Chemistry 67, no. 1 (1989): 104–8. http://dx.doi.org/10.1139/v89-018.

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Iodine nitrate or bromine nitrate in acetonitrile or in chloroform react with a variety of phenolic substrates to form both halogenated and nitrated products. In the presence of strong complexing agents of halonium ions, no reaction occurs, while in the presence of pyridine or triethylamine, only halogenated phenols exhibiting a strong ortho-directing effect of the phenolic function are produced. Keywords: phenols, iodine nitrate, bromine nitrate, halogenation, nitration.

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32

Rathod, Vaishali N. "Synthesis, Characterization and Catalytic Potency of Zn-based MOF for Knoevenagel Condensation Reaction." International Journal for Research in Applied Science and Engineering Technology 9, no. 11 (2021): 730–35. http://dx.doi.org/10.22214/ijraset.2021.38896.

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Abstract: A Zn based metal organic framework with pyridine 2, 5-dicarboxylate (Zn-based MOF) were prepared as a reusable heterogeneous catalyst using solvothermal method. Zn-based MOF was used as heterogeneous catalyst for synthesis 5-arylidene malononitrile in ethanol under reflux condition. The attractive features of present method are mild reaction condition, short reaction time, simplicity, easy separation of catalyst and excellent yield. Keywords: Metal organic framework, heterogeneous catalyst, solvothermal method.

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33

Choyal, Manisha. "Structural parameters of N-heterocyclic pyridinium methylides - A DFT study." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 35, no. 02 (2025): 342. https://doi.org/10.59467/ijhc.2025.35.342.

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The present communication includes an investigation of the structural parameters of nitrogen ylides present in differently substituted pyridine rings generated as a chemical intermediate during the formation of functionalized indolizine derivatives via [3+2]/1,3-dipolar cycloaddition. Remarkable experimental observations such as hydrogen bonding and delocalization of charge density have been made through computational calculation based on geometry optimization of ylides.. KEYWORDS :Cycloaddition reactions, Density functional theory, N-Heterocyclic ylides, Stereoelectronic effects.

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34

Rodríguez-Castellón, E., P. Olivera-Pastor, A. Jiménez-López, P. Maireles-Torres, M. J. Hudson та P. Sylvester. "Intercalation of aromatic amines into α-tin(IV) hydrogenphosphate monohydrate". Canadian Journal of Chemistry 67, № 12 (1989): 2095–101. http://dx.doi.org/10.1139/v89-326.

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Aromatic amines such as o-phenylenediamine, m-phenylenediamine, p-phenylenediamine, benzidine, and 2-amino-4-methylpyridine were intercalated into tin(IV) hydrogen phosphate monohydrate (α-Sn(HPO4)2•H2O). o-Phenylenediamine and 2-amino-4-methylpyridine form a bilayer, while m-phenylenediamine, p-phenylenediamine, and benzidine form a monolayer. Phenylenediamines are monoprotonated on the interlayer surface of the phosphate, whereas benzidine is diprotonated. 2-Amino-4-methylpyridine exhibits a different behaviour with respect to pyridine, because the positive charge is localized between the tw

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35

Ravi Kumar, Konda, K. N. S. Sneha Sumanjali, M. Priya Chandana, N. Srilatha, and P. Koteswara Rao. "Synthesis, Characterization and Anti-Microbial Activity of Novel Pyramidine Derivatives." Journal of Drug Delivery and Therapeutics 11, no. 2-S (2021): 98–102. http://dx.doi.org/10.22270/jddt.v11i2-s.4693.

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Pyrimidine is a heterocyclic aromatic organic compound similar to benzene and pyridine, containing two nitrogen atoms at positions 1 and 3 of the six-member ring. Three nucleobases found in nucleic acids, cytosine (C), thymine (T), and uracil (U), are pyrimidine derivatives. A pyrimidine has many properties in common with pyridine, as the number of nitrogen atoms in the ring increases the ring pi electrons become less energetic and electrophilic aromatic substitution gets more difficult while nucleophilic aromatic substitution gets easier. Chalcones react with aminoguanidine to give intermedia

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36

Kurup, Rishi R., Rakhi Mishra, Rupa Mazumder, and Avijit Mazumder. "Synthesis and evaluation of anti-convulsant activity of some new pyridylthiadiazole derivatives." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 35, no. 02 (2025): 541. https://doi.org/10.59467/ijhc.2025.35.541.

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The synthesis of some new 5-(pyridin-3-ylamino)-1,3,4-thiadiazole-2-carboxamides, 5-(pyridin-3-ylamino)- 1,3,4-thiadiazole-2-carboxylates and (1H-benzo[d]imidazol-6-yl)(5-(pyridin-3-ylamino)-1,3,4-thiadiazol-2-yl) methanone was accomplished by the reaction of 5-(pyridin-3-ylamino)-1,3,4-thiadiazole-2-carbonyl chloride with a substituted alcohols, amines and benzimidazole through amide and ester link formation at the thiadiazole ring. Molecular docking parameters assessed the potential of derivatives through CB2-dock software, and the docking score of the derivatives varied from the range of -6

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37

Chow, Yuan L., Yu-Jin Huang, and Veljko Dragojlovic. "A new synthesis of lactones from tertiary alkenylcarbinols by cobaltcatalyzed photocarbonylation under ambient conditions." Canadian Journal of Chemistry 73, no. 5 (1995): 740–42. http://dx.doi.org/10.1139/v95-094.

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In the presence of a Co catalyst, tertiary vinyl-, propenyl-, and allylcarbinols were chelatively cycloadded to carbon monoxide to produce lactones by xanthone-sensitized photoreaction in tetrahydrofuran, under CO at 1 atmosphere and at room temperature. At lower temperatures the isomerization of alkenylcarbinols was suppressed and lactones were obtained with improved selectivity. The photoprocess was facilitated by addition of pyridine or hydrogen and retarded in presence of amines or phosphines. Mechanistic interpretations for the process and the accompanying effects are discussed. Keywords:

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38

Saitoh, Yutaka, Take-aki Koizumi, Kohtaro Osakada, and Takakazu Yamamoto. "Preparation of symmetric dibromides of 1,10-phenanthroline." Canadian Journal of Chemistry 75, no. 10 (1997): 1336–39. http://dx.doi.org/10.1139/v97-160.

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Bromation of 1,10-phenanthroline with Br2 proceeds smoothly in the presence of S2Cl2 and pyridine to give 3,8-dibromo-1,10-phenanthroline in good yield. Bromation of 2,9-dibutoxy-1,10-phenanthroline with Br2, in an aqueous medium gives 5,6-dibromo-2,9-dibutoxy-1,10-phenanthroline selectively. Similar bromination of 4,7-dibutoxy-1,10-phenanthroline with Br2 gives 3,8-dibromo-4,7-dibutoxy-1,10-phenanthroline, which forms a 1:1 adduct with Cu(NO3)2. Molecular structure of the 1:1 adduct has been determined by X-ray crystallography. Keywords: bromination, 1,10-phenanthroline, 3,8-dibromo-1,10-phen

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39

Khajavali, S., A. Jayaraju, and J. Sreeramulu. "Synthesis, Characterization and Biological activities of 2-Amino-3-Methyl pyridine New Dithiocarbamate metal complexes." Journal of Drug Delivery and Therapeutics 9, no. 3-s (2019): 36–39. http://dx.doi.org/10.22270/jddt.v9i3-s.2742.

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Dithiocarbamates are a class of sulfur-based metal-chelating compounds with various applications in medicine. A new series of new transition metal [Cu(II), and Ni(II)] complexes of dithiocarbamates were synthesized from 2-Amino-3-Methyl pyridine and Carbon disulfide and further characterized. The investigation of these complexes confirmed that the stability of metal–ligands coordination through, S&S,N atoms as bidendate chelates.. It is necessary to understand the binding properties in developing new potential Protein targeting against neurological disorders. Keywords:2-Amino-3-Methylpyrid

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40

Suka, Irwan Ginting, and Wasinton Simanjuntak. "CHARACTERISTICS OF RICE HUSK SILICA GRAFTED 4-VINYL PYRIDINE." Indonesian Journal of Chemistry 8, no. 1 (2010): 25–30. http://dx.doi.org/10.22146/ijc.21643.

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This study was carried out to investigate the grafting of4-Vinyl Pyridine (4-VP) on silica prepared from rice husk, with the main aim to study wether the 4-VP grafted retains its characteristics. For this purpose, the grafted silica was analysed using FTIR spectroscopic method, followed by testing of the sample for solvent adsorption, Cu2+ adsorption from solution, and bacterial inhibitions, since 4-VP has been known to possess such properties. The FTIR analysis revealed that under the experimental conditions applied, the 4-PV was well grafted onto silica surface. The success of grafting was a

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41

Dufour, Pascal, Yves Dartiguenave, Michèle Dartiguenave, et al. "Crystal structures of 7-azaindole, an unusual hydrogen-bonded tetramer, and of two of its methylmercury(II) complexes." Canadian Journal of Chemistry 68, no. 1 (1990): 193–201. http://dx.doi.org/10.1139/v90-025.

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Crystals of 7-azaindole ([Formula: see text], a = 11.312(4), b = 14.960(6), c = 15.509(5) Å, α = 102.86(3), β = 108.78(3), γ = 90.71(3)°, Z = 16, R = 0.052) contain tetrameric units of approximate S4 symmetry, in which the molecules are associated by means of four complementary N—H … N hydrogen bonds. [CH3Hg(7-azaindole)]NO3 ([Formula: see text], a = 7.818(3), b = 7.884(3), c = 9.135(4) Å, α = 97.89(3), β = 109.13(3), γ = 103.28(3)°, Z = 2, R = 0.039) contains well-separated nitrate ions and complex cations in which the methylmercury group is linearly bonded to the pyridine nitrogen atom, wher

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42

Goyal, Rakesh, Mukesh Sharma, Dharmendra Ahuja, and Anurekha Jain. "Synthesis and Evaluation of Aldehyde Derivatives of Sulfonyl Chloride Quinoxaline." Journal of Drug Delivery and Therapeutics 9, no. 4-A (2019): 921–27. http://dx.doi.org/10.22270/jddt.v9i4-a.3142.

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In pyrazine mesomeric interaction between the protonated & neutral nitrogen atoms probably destabilizes the cation.N, N’-diprotonation is very easier for pyrazine Synthesis of 2, 3-diphenylquinoxaline by phenylene-diamine in 16 ml of rectified spirit was added & combine solution was warm in water bath for 30 min. added water until slight colorless persist & allow to cool recrystallize the product in ethanol. Synthesis of 2, 3-diphenylquinoxaline 7-sulfonylchloride (R) using chlorosulfonic acid under ice-cold condition, then Synthesis of 2-hydroxyphenyl-2,3-diphenylquinoxaline-7-sul

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43

Mohite, P.B. 1. *. Bhoge N.D 2. "COMPARATIVE STUDY ON CONVENTIONAL, MICROWAVE AND ULTRASOUND-ASSISTED SYNTHESIS AND BIOLOGICAL EVALUATION OF TETRAZOLE DERIVATIVES." Journal of Pharma Research 8, no. 4 (2019): 127–31. https://doi.org/10.5281/zenodo.2647848.

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<strong><em>ABSTRACT</em></strong> <strong><em>I</em></strong><em>n the present study a series of novel 6-(4-nitrophenyl)-4-substituted-3-(1H-tetrazol-5-yl)pyridin-2(1H)-one derivatives(3a-3j) by conventional, microwave and ultrasound assisted synthesis method. Advantages of the ultra sound effect were observed and high yields of the products were obtained after20–45 min ultrasonication. Characterization and structural elucidation of the products was realized based on chemical, analytical and spectral analyses. The results clearly demonstrated a high efficiency of the ultrasonic systems

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44

Prashanthi, Y., and Shiva Raj. "Synthesis and Characterization of Transition Metal Complexes with." Journal of Scientific Research 2, no. 1 (2009): 114–26. http://dx.doi.org/10.3329/jsr.v2i1.2732.

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The Schiff bases namely MIMFMA, MIMTMA and MIPMA have been prepared by reacting 3-amino-5-methyl isoxazole with 5-methyl furan-2-carboxyaldehyde, 5-methyl thiphene-2-carboxaldehyde and pyridine-2-carboxaldehyde. The Cu(II), Ni(II), Co(II), Zn(II) and VO(IV) have been prepared by reacting metal chlorides with those Schiff bases in an alchololic medium. The complexes are electrolytes in DMSO. These have been characterized by using elemental analysis, IR, UV-VIS, 1H, 13C, mass spectra, magnetic susceptibility, conductance measurements and thermo gravimetric studies. The complexes were found to ha

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45

Kruczynski, Leonard J., Alberta E. Lemire, Kirk Marat, and Alexander F. Janzen. "Phenylfluorophosphoranes: axial–equatorial fluorine exchange in RC6H4PF3H and intermolecular exchange in the PhPF2(H)OMe–MeOH–base system." Canadian Journal of Chemistry 68, no. 3 (1990): 488–91. http://dx.doi.org/10.1139/v90-075.

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Activation parameters for axial–equatorial fluorine exchange in arylfluorophosphoranes RC6H4PF3H, where R = o-CF3, m-CF3, p-CF3, m-CH3, were studied by the dynamic nmr technique: [Formula: see text] varied between 53 and 56 kJ mol−1.The synthesis of difluoromethoxyphenylphosphorane, PhPF2(H)OMe, from PhPF2 and MeOH is catalyzed by small amounts of Et3N, pyridine, PhPF3H, or HF. Rapid intermolecular ligand exchange occurs in PhPF2(H)OMe after addition of methanol and a base such as triethylamine or pyridine. Under these conditions, exchange of fluorine, hydrogen, and methoxy ligands occurs, as

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46

Gillet, Henri. "Thermodynamique de la solvatation d'acides protoniques et des bases conjuguées en milieux hydroorganiques riches en eau à 25 °C." Canadian Journal of Chemistry 68, no. 5 (1990): 655–65. http://dx.doi.org/10.1139/v90-101.

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We have measured at 25 °C the enthalpies of solution of acetic, benzoic, and valeric acids and of their potassium salts in water – tert-butyl alcohol mixtures containing up to 40% by weight of organic cosolvent. We have also determined these quantities for phenol, aniline, and pyridine in the same mixtures and for acetic acid, aniline, and pyridine in water–DMSO, water–acetone, and water–urea in the zone rich in water. Using these data we have calculated the standard enthalpies of solution, the corresponding transfer quantities, and the enthalpies of solvation. When the enthalpies of solution

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47

Majumdar, Krishna C., and Anup K. Kundu. "Pyridine hydrobromide perbromide mediated regioselective heterocyclization of ortho-cyclohexenyl phenols." Canadian Journal of Chemistry 73, no. 10 (1995): 1727–32. http://dx.doi.org/10.1139/v95-211.

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A number of 3,4-benzo-9-bromo-2-oxabicyclo[3.3.1]nonanes (9a–h) are synthesized in almost quantitative yields by regioselective heterocyclization of ortho-cyclohexenyl phenols (8a–h). The structures of 3,4-benzo-9-bromo-2-oxabicyclo[3.3.1]nonane 9 have been unambiguously settled by the synthesis of 9-chloromercuri-3,4-(4′-methoxybenzo)-2-oxabicyclo[3.3.1]nonane 13, which has an X-ray determined structure, and by converting 13 to product 9c with bromine in sunlight in 45% yield. The 6-chloro-2-cyclohexenenyl phenol 8i and 2-cyclohexenyl-4-methyl phenol 8j failed to give any cyclic product but i

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48

Rudyanto, Marcellino, and Lanny Hartanti. "SYNTHESIS OF SOME CINNAMIC ACID DERIVATIVES: EFFECT OF GROUPS ATTACHED ON AROMATIC RING TO THE REACTIVITY OF BENZALDEHYDE." Indonesian Journal of Chemistry 8, no. 2 (2010): 226–30. http://dx.doi.org/10.22146/ijc.21626.

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Synthesis of cinnamic acid and its six derivatives has been done by employing Knoevenagel reaction. Benzaldehyde, 4-butylbenzaldehyde, 4-t-butylbenzaldehyde, 4-butoxybenzaldehyde, 4-phenylbenzaldehyde, 5-bromo-2,4-dimethoxybenzaldehyde, and 5-bromo-2,3-dimethoxybenzaldehyde were reacted with malonic acid in pyridine – piperidine to give cinnamic acid (85,3%), 4-butylcinnamic acid (69,3%), 4-t-butylcinnamic acid (77,7%), 4-butoxycinnamic acid (64,5%), 4-phenylcinnamic acid (65,5%), 5-bromo-2,4-dimethoxycinnamic acid (53,2%) and 5-bromo-2,4-dimethoxycinnamic acid (57,2%), respectively. It was di

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49

Otieno, Tom, and Robert C. Thompson. "Antiferromagnetism and metamagnetism in 1,4-diazine and pyridine complexes of nickel(II)." Canadian Journal of Chemistry 73, no. 2 (1995): 275–83. http://dx.doi.org/10.1139/v95-037.

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Several nickel(II) complexes containing pyridine (py), pyrazine (pyz) or methylpyrazine (mepyz) have been synthesized and characterized by vibrational and electronic spectroscopy, differential scanning calorimetry, and magnetic susceptibility studies to cryogenic temperatures. A comparison of the magnetic properties of the polymeric diazine-bridged complexes, Ni(pyz)2X2 (X = Cl or NO3), Ni(pyz)(p-CH3C6H4SO3)2, Ni(mepyz)(NO3)2, and Ni(pyz)3(CH3SO3)2•CH3OH with those of the related monometallic systems, Ni(py)4X2 (X = Cl, p-CH3C6H4SO3 or CH3SO3) and Ni(mepyz)4(NO3)2•H2O provides evidence for wea

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50

Burrow, Timothy E., Alan J. Lough, Robert H. Morris, and Raymond L. Richards. "Elucidation of the structures of the hydridothiolato complexes WH(SC6H2Pri3-2,4,6)3(L)(PMe2Ph), L = PMe2Ph or pyridine, by NMR and X-ray techniques." Canadian Journal of Chemistry 73, no. 7 (1995): 1092–101. http://dx.doi.org/10.1139/v95-135.

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Measurement of the T1 values of the 31P nuclei in the unusual capped trigonal bipyramidal complexes WH(tipt)3(PMe2Ph)2 (1, tipt = SC6H2Pri3-2,4,6) and W(2H)(tipt)3(PMe2Ph)2 allows the determination of the phosphorus–hydride distance of 2.2 ± 0.2 Å and the P-W-H angle of about 62 ± 7°. An approximate location of the hydride on an S2P face is proposed on the basis of steric interactions. The crystal structure of WH(tipt)3-(NC5H5)(PMe2Ph) (2) is reported; the WS3NP core consists of a distorted trigonal bipyramidal system with the phosphine and pyridine ligands axial and the thiolate ligands equat

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