Có 140+ tài liệu thuộc chủ đề "Journal of Chemistry"
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Ion-pair based liquid–liquid extraction of gold(III) from malonate media using 2-octylaminopyridine as an extractant: analysis of alloys, minerals, and drug. Abstract: Liquid–liquid extraction of Au(III) from aqueous sodium malonate medium using 2-octylaminopyridine (2-OAP) as an extractant in xylene was achieved. The current work explored the influence of several experimental parameters such as pH, weak acid concentration, extractant concentration, equilibrium time,...
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A rapid and sensitive spectrofluorometric method for the determination of Au(III) based on fluorescence quenching of a 1,3,5-triphenyl-2-pyrazoline. Abstract: A simple, rapid, sensitive, and low-cost spectrofluorometric method was developed for the determination of Au(III) using 5-(2,3-dimethoxyphenyl)-3-(4-methoxyphenyl)-1-phenyl-4,5-dihydro-1H-pyrazole (L) in ethanol/water.. The method is based on the change in the fluorescence intensity at 464 nm after excitation at 355 nm as a...
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Abstract: Nitric oxide is one of the most important biochemical parameters in biological processes. There is need for the design of stable and durable solid phase nitric oxide sensors. We applied silver nanoparti- cles and ionic liquids in the fabrication process of polymeric electrospun fibers and thin films. Presence of the ionic liquid enhanced the sensor response in all of...
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The antibacterial activity of the newly synthesized compounds was evaluated against Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae, and Staphylococcus aureus strains using norfloxacin as a reference. Results showed that most of the tested compounds had higher activity against E. The biological activity of the target compounds, expressed in log MIC, is correlated with lipophilicity, polarizability, and topology parameters. Results showed...
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Compound 1-O was synthesized by two consecutive Suzuki coupling reactions using 2,5- dimethylthiophene-3-boronic acid and 5-methyl-2-phenylthiazole-4-boronic acid. Photochromic compounds 2-O and 3-O were prepared by multistep reactions starting with 3-iodo-4-bromo-1,8-naphthalic anhydride and 2,5-dimethylthiophene- 3-boronic acid or 2-phenyl-5-methylthiazole-4-boronic acid. All photochromic compounds showed a color change from colorless (or light yellow) to blue-green, purple, or orange colors (depending on the nature...
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Synthesis, characterization, and evaluation of toxicity of quaternary ammonium chlorides of glucose-based ester. Abstract: This study presents the synthesis of glucose-based surfactants including quaternary ammonium salts. Their surface properties and influence on the soil environment were investigated. The synthesized quaternary ammonium chlorides of glucose-based ester exhibited good surface tension reduction properties and formed stable foam in contact with water. The...
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2.54 (2H, m, –CH 2. 2.82 (2H, t, J = 7.1 Hz, –CH 2. 6.53 (1H, dd, J = 3.5 and 1.8 Hz, furan –CH. 6.64 (1H, d, J = 8.9 Hz, furan –CH. 25.0 (–CH 2. 31.3 (–CH 2. 114.3 (furan –CH. 114.8 (furan –CH. 144.9 (furan –CH. 156.1 (furan –CH. 1 H NMR (500 MHz, CDCl 3 ,...
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halobenzodithiophene derivatives against alpha-glucosidase, urease, and free radical production. In the present study, halobenzodithiophene, the simplest benzofused thiophene, and its derivatives were synthesized and evaluated against alpha-glucosidase, urease, and free radical production. In the alpha-glucosidase inhibition as- say, compound 2,2-bisbenzothiophne (1) exhibited potent activity with IC µ M, while its derivative 2,7-bis(butoxycarbonyl)-3,6-dichlorobenzo[1,2- b;6,5- b’]dithiophene (2) exhibited promising inhibition with IC...
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Moreover, the electrochemical properties of the modified electrodes were in- vestigated using cyclic voltammetry, electrochemical impedance voltammetry, and differential pulse voltammetry (DPV).. The Nf/Pd@CeO 2 -APTES/GCE showed a linear range of 2.5–149.5 µ M for DA by DPV with a notable sensitivity of 0.83 mA mM − 1 cm − 2 and a low limit of detection of 0.46 µM...
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Abstract: Our focus in this study is on the design and synthesis of a light-responsive peptide-based nanocarrier in order to develop effective and biocompatible drug delivery systems. The synthesized nanocarrier is basically composed of peptide amphiphiles comprising a micelle forming a Pro-Pro-Pro-Lys-Lys-Lys peptide sequence with an attached anthracene fluorophore. Anthracene containing an inner core of the micelle can serve as...
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The adsorption of the textile dye acid green 1 (AG1) by CLDH was carried out at different pH levels, adsorbent–adsorbate contact times, and AG1/CLDH mass ratios. Equilibrium at room temperature was reached after 24 h, which was confirmed by the kinetic modeling of the experimental data by the pseudo-second-order model. The comparative study of adsorption isotherms in calcined and uncalcined...
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Castor oil and PEG-based shape memory polyurethane films: effect of chain extender amount on some polymer properties and performance. Since it was found in our previous study that hard segment content is more effective on shape memory property than soft segment length (Bonfil, M., Sirkecioglu, A., Bingol-Ozakpinar, O., Uras, F., Güner, F. in this study the effects of BD amount...
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4 ′ -Oxy-1 ′ -naphthaldehyde substituted mono- (3), bis- (4), and tris- (5) cyclotriphosphazenes were obtained from the nucleophilic substitution of compound 1 with 2 in a 1:2 molar ratio in the presence of Cs 2 CO 3 in acetone at reflux. The pentakis-(6) and hexakis-substituted (7) cyclotriphosphazenes were prepared from the reaction of 1 with 2 in a 1:7...
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determination of nitrate and thiocyanate ions of ultra-heat-treated milk samples. However, studies on the constituents of UHT milk are scare. In the present study, nitrate and thiocyanate contents of commercial UHT whole cow milk were determined simultaneously by sample stacking-capillary electrophoresis. The best separation of nitrate and thiocyanate ions was performed by reducing the electroosmotic flow at pH 4.0 using...
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Ethyl 1-(2-chloroacetyl)-4-hydroxy-2,6-diphenyl-1,2,5,6-tetrahydropyridine-3-carboxylate and their 4-O-aryl sul- fonates (Figure 1, compounds 1–6) were synthesized by Aridoss et al. 32 Raju et al. 33 Another multicomponent reaction of aromatic aldehydes, arylamines, and β -ketoester in the presence of bismuth nitrate was carried out by Yankin et al. 34 Srivastava et al. Therefore, modification of the aromatic ring with unsubstituted tetrahydrothienopyridine significantly improved...
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Phase transition of chemically synthesized FePt nanoparticles under high pressure. Abstract: We present the results of a study related to phase transformation of chemically synthesized FePt nanoparticles under high pressure from face-centered cubic into face-centered tetragonal structure. Results show that high- pressure annealing lowers the decomposition temperature of the surfactants surrounding nanoparticles and partially hinders agglomeration arising from heat treatment....
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Thermolytic synthesis of cobalt and cobalt sulfide nanoparticles using Cobalt(II) N ∧ O Schiff base complexes as single molecular precursors. Abstract: Two novel N ∧ O-type Schiff base ligands and the corresponding Co(II) complexes are reported. The significant difference in the thermal decomposition profiles is recognized as an influence of structural differences on the complexes. Thus, the complexes were thermally...
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The binder, in addition to the sticking effect, contributes to electric charge storing via the redox process of catechol moieties of poly(3,4-dihydroxy-L-phenylalanine) and also the formation of a high charge-storing double layer due to the presence of poly(ethylenedioxythiophene). It is widely used in the food industry and as a preferred drug instead of using direct dopamine in the treatment of...
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Synthesis, sintering, electrical properties, and sodium migration pathways of new lyonsite Na 2 Co 2 (MoO 4 ) 3. Abstract: A new double molybdate Na 2 Co 2 (MoO 4 ) 3 was synthesized via solid-state reaction and characterized by single-crystal X-ray diffraction (XRD). This compound is a new member of the lyonsite structure type. It crystallized in the orthorhombic...
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Surfaces of the TiO 2. Molar ratios of TiO 2 :glymo were and 7.5 in the films. Adhesions of the obtained films were classified as 5B and pencil hardness increased with the increase in the ratio of the TiO 2 in the films. Low- temperature curing brings the advantage of utilization of the films on polymer substrates and also there...