Có 160+ tài liệu thuộc chủ đề "Journal of Chemistry"
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Synthesis and evaluation of catecholase activities of metal complexes of 1,4-substituted piperazine Mannich base of 4-acetamidophenol. The Mannich reaction leading to the formation of the ligand took place at both ends of piperazine. Four metal complexes [Cu(II) and Fe(III)] including those bearing thiocyanate groups (SCN–) in N- and S-bonding modes have been studied for their abilities to mimic catecholase oxidase....
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BD(2) O 3 - C 7 BD*(2) C 11 - C 12 13.45 BD(2) N 4 - C 13 LP (2) N 5 52.80 BD(2) N 4 - C 13 BD*(2) N 4 - C 13 0.89 BD(2) N 4 - C 13 BD*(2) C 14 - C 19 1.37 BD(2) N 6 - C 20...
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In monomeric complexes 1 and 3b both diphenyl(2-pyridyl) phosphine ligands are monodentate and are coordinated through the P-atom. The third phosphine ligand acts as a bridged ligand, coordinated to the metal centers through the P-atom and N-atom. Complexes 1 and 3b were tested for radical scaveng- ing activity using 2,2-diphenyl-1-picrylhydrazyl (DPPH) as a free radical. A prominent color change after...
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This interaction of CT-DNA with PcZn was investigated using electronic absorption spectra, emission spectroscopy, a thermal melting temperature study, cyclic voltammetry, and viscosity measurements in a Tris-HCl buffer solution at a pH of 7.2. In addition to the techniques above, a gel electrophoresis study was also carried out to verify the interaction of CT-DNA with the PcZn complex. The results...
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A new cocrystal explosive trinitrotoluene (TNT):1-amino-4-bromonaphthalene with reduced sensitivity. Abstract: A 1:1 cocrystal of TNT and 1-amino-4-bromonaphthalene was prepared via solvent evaporation. The structure of the cocrystal was determined via single-crystal and powder X-ray diffraction. nitro), halogen bonding, and π − π stacking. Hirshfeld surfaces showed that these weak interactions were significant for crystal packing. We analyzed the crystal packing...
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The cytotoxicity of all the title compounds were evaluated as per the National Cancer Institute protocol in a one-dose assay (10 µ M) on nine different panels of 59 cancer cell lines. Key words: Anticancer activity, cancer cell lines, cytotoxicity, one dose assay, oxadiazole, triazole. 1 In new cancer cases and 609,640 cancer deaths are projected to occur in the...
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Abstract: One-pot synthesis of novel quinoline- and quinolone-substituted 1,2,3-triazoles has been performed from the key intermediates, quinoline- and quinolone-substituted propargyl derivatives yields). The antioxidant properties of the newly synthesized compounds, 1a–1c, 2a–2c, and 3a–3c, were evaluated by monitoring DPPH (2,2- diphenyl-1-picrylhydrazyl) radical scavenging abilities, metal chelating effects, and reducing power. All of the compounds showed low chelating capacity.. Furthermore, the...
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The maximum radical scav- enging (46.5%) and reducing power activities were obtained from 1 and maximum ferrous chelating effect was obtained from 6 (72.1%) at the concentration of 500 µ g/mL. To indicate DNA binding activity of the complexes calf thymus DNA was used. The quinoline ring plays an important role in the development of new anticancer agents as their...
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Synthesis of the polymer in basic aqueous solution under hydrothermal conditions or via conventional heating resulted in the formation of bulky powders including irregularly shaped particles of the polymer. The morphologies of the synthesized polymers were characterized by scanning electron microscopy (SEM).. The thermal stability of the synthesized polymer was studied by thermogravimetry and differential scanning calorimetry techniques. Applicability of...
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Synthetic strategies towards the carbenoid reactions of α, β -acetylenic carbonyls. Abstract: Catalytic reactions of α, β -conjugated carbonyl compounds have been a practical tool towards the synthesis of different useful heterocyclic compounds. Despite the numerous reactions with carbon-carbon double bond conjugated carbonyls, reactions of acetylenic carbonyls are limited. After Spencer’s 25 − 27 pioneering work, several studies on the...
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Investigation of the hydrogen bond donating ability of 1,8-naphthalenediol by NMR spectroscopy and its use as a hydrogen bonding catalyst. Abstract: The hydrogen bond donating ability of 1,8-naphthalenediol was investigated via a series of 1 H, 13 C, and 31 P NMR experiments. Complexation studies using triphenylphosphine oxide and cyclohexanone as hydrogen bond acceptors revealed that 1,8-naphthalenediol is a more...
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A novel core-shell-based chromatographic method supported by ratio derivative spectrophotometry for the simultaneous determination of perindopril,. Abstract: In this work, ratio spectra of the first derivative spectrophotometric and liquid chromatographic methods have been described for the first time for the simultaneous determination of perindopril (PER), indapamide (IND), and amlodipine (AML) in dosage forms. The separation was carried out at 30...
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Multicomponent synthesis of pyrimidine derivatives 13 and 16.. For the first time, environmentally friendly microwave-mediated reaction between aminotriazole 17, mal- ononitrile 18, and carbonyl compounds 19 under aqueous conditions resulted in the formation of triazolopy- rimidines yield) in the laboratories of Dandia and coworkers. In the following year, Sheibani and colleagues condensed aromatic aldehydes 21, malononitrile 18, and amidines 22...
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The bovine serum albumin (BSA) binding of the newly synthesized 1,2,4-triazole derivatives was evaluated along with thermodynamics, site-selective binding, and synchronous study. Based on these findings, it was of interest to synthesize a new series of triazole derivatives and evaluate their interaction with BSA by studying the effect of varying substituents on the binding strength of the triazole derivatives. The...
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cation is exchanged by the V 4+/5+ cation in the perovskite structure. This ion replacement improves the ionic conduc- tivity and catalytic activity for oxygen reduction reaction in the perovskite structure, presumably due to the smaller size of the V 4+/5+ cation than the La 3+ ion. They are electrochemical devices that convert chemical energy into electrical energy with high...
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Synthesis, spectroscopic characterization, and computational studies of 2-cyano-6-hydroxybenzothiazole: a key synthetic intermediate of firefly luciferin. Here we report cost-effective and efficient syntheses of 2-cyano-6- hydroxybenzothiazole through the catalytic Sandmeyer-type cyanation reaction. Our approach employs diazonium tetrafluoroborate salt of 2-amino-6-hydroxybenzothiazole as a cyanation substrate. In addition, computational studies of the 2-cyano-6-hydroxybenzothiazole structure were performed based on the density functional theory method....
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Abstract: A series of new extensively conjugated E -stilbene azomethines (5a–5h) were synthesized and screened for their antioxidant and antimicrobial activity. Additionally, compounds 5a–5h were also evaluated for antioxidant potential using DPPH free radical scavenging and ferric thiocyanate (FTC) assays. The structure elucidation of the synthesized compounds was carried out by UV-Vis, FT-IR, 1 H NMR, 13 C NMR, and...
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Abstract: In this paper, the possibility of using an electrochemically activated carbon-paste electrode (ECA-CPE) for the determination of morin has been studied. It is established that the oxidation current increases 1.85 times in comparison with untreated CPE. The adsorption nature of the anodic current and the number of electrons taking part in the oxidation of morin on ECA-CPE was established....
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Abstract: The affinity of irbesartan (IRB) to form inclusion complexes with β -cyclodextrin ( β -CD), hydroxypropyl- β -cyclodextrin (HP-β -CD), and γ -cyclodextrin ( γ -CD) was investigated in aqueous buffered solutions at pH 1.7, 4.1, and 7.0. Analysis of the UV absorption-pH profiles revealed that IRB has two p K a values: pK a1 = 3.60 (imidazolinone ring...
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Synthesis and investigation of langbeinite-related strontium- and iron-containing phosphates. Abstract: The partial substitution of potassium atoms by strontium atoms in initial matrix K 3 Fe 2 (PO 4 ) 3 with formation of complex phosphates K 3−2x Sr x Fe 2 (PO 4 ) 3 ( x and 1.25) was determined using a solid-state reaction method. According to powder X-ray...