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Articles 961 - 990 of 2730
Full-Text Articles in Physical Sciences and Mathematics
Use Of Calcined Layered Double Hydroxide [Zn$_{2}$-Al-Co$_{3}$] For Removal Of Textile Dye Acid Green 1 From Wastewater: Kinetic, Equilibrium, Comparative, And Recycling Studies, El Hassane Mourid, Mohamed Lakraimi, Souad El Abridi, Lhaj Benaziz, El Hassan Elkhattabi, Moha Berraho
Use Of Calcined Layered Double Hydroxide [Zn$_{2}$-Al-Co$_{3}$] For Removal Of Textile Dye Acid Green 1 From Wastewater: Kinetic, Equilibrium, Comparative, And Recycling Studies, El Hassane Mourid, Mohamed Lakraimi, Souad El Abridi, Lhaj Benaziz, El Hassan Elkhattabi, Moha Berraho
Turkish Journal of Chemistry
In the present study, calcined layered double hydroxides (CLDHs) were obtained by heating [Zn$_{2}$-Al-CO$_{3}$] at 500 $^{\circ}$C. 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 adsorption is described by a Langmuir-type isotherm. The comparative study of adsorption isotherms in calcined and uncalcined phases reveals that the former could be a good candidate for trapping such pollutants. After …
Castor Oil And Peg-Based Shape Memory Polyurethane Films: Effect Of Chain Extender Amount On Some Polymer Properties And Performance, Ece Gi̇zem Çakmak, Di̇lek Dalgakiran, Fatma Seni̇ha Güner
Castor Oil And Peg-Based Shape Memory Polyurethane Films: Effect Of Chain Extender Amount On Some Polymer Properties And Performance, Ece Gi̇zem Çakmak, Di̇lek Dalgakiran, Fatma Seni̇ha Güner
Turkish Journal of Chemistry
A series of polyurethane (PU) films were synthesized via one-shot bulk polymerization with polyethylene glycol, castor oil, hexamethylene diisocyanate, and 1,4-butanediol (BD) at three different chain extender ratios. 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. S. J. Appl. Polym. Sci. 2014, 131, 1-12), in this study the effects of BD amount on some physical properties, thermal properties, and shape memory performance of the films were investigated. Shape fixity and shape recovery were achieved under …
A Sample Stacking-Capillary Electrophoresis Method For Simultaneous Determination Of Nitrate And Thiocyanate Ions Of Ultra-Heat-Treated Milk Samples, Fi̇li̇z Tezcan
Turkish Journal of Chemistry
Ultra-heat-treated (UHT) cow milk is mostly consumed in Turkey. Heating milk can cause some chemical and biochemical changes that affect different components of milk. 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 30 mM formic acid and 30 mM sodium sulfate containing separation electrolyte. Analysis was completed in less than 3 min. The limits of detection obtained at a …
Tetrahydropyridine: A Promising Heterocycle For Pharmacologically Active Molecules, Noor Ul Amin Mohsin, Matloob Ahmad
Tetrahydropyridine: A Promising Heterocycle For Pharmacologically Active Molecules, Noor Ul Amin Mohsin, Matloob Ahmad
Turkish Journal of Chemistry
The tetrahydropyridine (THP) ring system has received considerable focus due to its excellent ability to act as a pharmacophore. It is recognized as a major constituent in natural alkaloids. THP derivatives have been reported for a diverse range of biological activities. Recent synthetic works contain syntheses of monosubstituted, disubstituted, trisubstituted, highly functionalized, and condensed structures. In this review, we summarize the recent literature dealing with the bioactive nature of this important heterocycle.
Phase Transition Of Chemically Synthesized Fept Nanoparticles Under High Pressure, Telem Şi̇mşek, Özgür Karci, Şadan Özcan
Phase Transition Of Chemically Synthesized Fept Nanoparticles Under High Pressure, Telem Şi̇mşek, Özgür Karci, Şadan Özcan
Turkish Journal of Chemistry
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. As-synthesized nanoparticles are around 4.5 nm and show superparamagnetic behavior at 300 K. After annealing under 60 bar pressure of hydrogen at 400 $^{\circ}$C for 2 h, nanoparticles exhibit strong ferromagnetic behavior with 5391 Oe coercivity. Results show that high-pressure annealing lowers the decomposition temperature of the surfactants surrounding nanoparticles and partially hinders agglomeration arising from heat treatment. The promising ferromagnetic properties of the FePt nanoparticles after annealing under high pressure make them suitable …
Synthesis, Sintering, Electrical Properties, And Sodium Migration Pathways Of New Lyonsite Na$_{2}$Co$_{2}$(Moo$_{4})_{3}$, Rawia Nasri, Riadh Marzouki, Samuel Georges, Said Obbade, Mohamed Faouzi Zid
Synthesis, Sintering, Electrical Properties, And Sodium Migration Pathways Of New Lyonsite Na$_{2}$Co$_{2}$(Moo$_{4})_{3}$, Rawia Nasri, Riadh Marzouki, Samuel Georges, Said Obbade, Mohamed Faouzi Zid
Turkish Journal of Chemistry
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 system, space group Pnma with cell parameters $a$ = 5.272(2) Å, $b$ = 10.816(3) Å, and $c$ = 18.064(3) Å. The structure can be described as a three-dimensional framework with hexagonal tunnels in which the Na$^{+}$ cations lie. The obtained structural model is supported by charge distribution analysis and bond valence sum validation tools. Fourier-transform infrared spectroscopy and scanning electron microscopy analyses were carried out. Ball milling …
Thermolytic Synthesis Of Cobalt And Cobalt Sulfide Nanoparticles Using Cobalt(Ii) N$\Wedge $O Schiff Base Complexes As Single Molecular Precursors, Sandile H. Khoza, Siphamandla C. Masikane, Sixberth Mlowe, Itegbeyogene P. Ezekiel, Thomas Moyo, Neerish Revaprasadu
Thermolytic Synthesis Of Cobalt And Cobalt Sulfide Nanoparticles Using Cobalt(Ii) N$\Wedge $O Schiff Base Complexes As Single Molecular Precursors, Sandile H. Khoza, Siphamandla C. Masikane, Sixberth Mlowe, Itegbeyogene P. Ezekiel, Thomas Moyo, Neerish Revaprasadu
Turkish Journal of Chemistry
Two novel N$\wedge $O-type Schiff base ligands and the corresponding Co(II) complexes are reported. Thermogravimetric analysis indicated that the complexes are potential molecular precursors for the fabrication of cobalt and cobalt-containing nanomaterials. The significant difference in the thermal decomposition profiles is recognized as an influence of structural differences on the complexes. Thus, the complexes were thermally decomposed using the melt and hot injection methods to examine the properties of the obtained cobalt and cobalt sulfide nanoparticles, respectively. The reaction parameters employed during the fabrication processes, in addition to structural differences, influenced the morphological and crystallographic phases and magnetic properties of …
Preparation And Characterization Of Photocatalytic Tio$_{2}$/Glymo Nanocomposite Films, Esi̇n Akarsu, Hasan Erdem Çamurlu
Preparation And Characterization Of Photocatalytic Tio$_{2}$/Glymo Nanocomposite Films, Esi̇n Akarsu, Hasan Erdem Çamurlu
Turkish Journal of Chemistry
The reflux method was utilized for the synthesis of 5% Sn-doped TiO$_{2}$ nanopowder. Surfaces of the TiO$_{2}$ particles were modified with 3-glycidoxypropyltrimethoxysilane (glymo) and glass surfaces were coated with this solution by a spin-coating process. Molar ratios of TiO$_{2}$:glymo were 0.25, 0.5, 2.5, and 7.5 in the films. Nanocomposite films were cured at 130 $^{\circ}$C. 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. Film thickness decreased from 5 $\mu $m to 0.3 $\mu $m when TiO$_{2}$:glymo was increased from 0.25 to 7.5. The …
Poly L-Dopa/Poly(Ethylenedioxythiophene) As A Novel Mussel-Inspired Electroactive Binder For Environmentally Friendly Hybrid Supercapacitors, Elham Heydaripour, Mohammad Reza Nateghi, Mohammad Hossein Mosslemin
Poly L-Dopa/Poly(Ethylenedioxythiophene) As A Novel Mussel-Inspired Electroactive Binder For Environmentally Friendly Hybrid Supercapacitors, Elham Heydaripour, Mohammad Reza Nateghi, Mohammad Hossein Mosslemin
Turkish Journal of Chemistry
3,4-Dihydroxy-L-phenylalanine and ethylenedioxythiophene were chemically copolymerized via an oxidative process in aqueous solution. The copolymer was used as a novel mussel-inspired electroactive binder in conjunction with a nickel-based metal organic frame work for fabrication of environmentally friendly supercapacitors. 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). Cyclic voltammetry, charge/discharge measurements, and electrochemical impedance spectrometry showed that the hybrid supercapacitors based on Ni-benzidine MOF with the new electroactive binder exhibit very …
Synthesis And Evaluation Of Catecholase Activities Of Metal Complexes Of 1,4-Substituted Piperazine Mannich Base Of 4-Acetamidopheno, Ayowole Olaolu Ayeni, Gareth Mostyn Watkins
Synthesis And Evaluation Of Catecholase Activities Of Metal Complexes Of 1,4-Substituted Piperazine Mannich Base Of 4-Acetamidopheno, Ayowole Olaolu Ayeni, Gareth Mostyn Watkins
Turkish Journal of Chemistry
The synthesis and characterisation including $^{1}$H and $^{13}$C NMR spectroscopy of a Mannich~base~1,4-di-(5-acetamido-2-hydroxybenzyl)piperazine~is herein reported. 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. All the metal complexes are catalytically active with the highest turnover rate (k$_{cat})$ recorded for complex 3. The catalytic process as monitored by $^{1}$H NMR spectroscopy (isolation of 3, 5-DTBQ) and iodometric titration revealed the formation of H$_{2}$O$_{2}$ and thus implied …
Experimental And Theoretical Studies On Cis-Dioxomolybdenum(Vi) Complexes Of Onn-Donor~Thiosemicarbazone, Berat İlhan Ceylan, Ayberk Yilmaz, Olcay Bölükbaşi Yalçinkaya, Bahri̇ Ülküseven
Experimental And Theoretical Studies On Cis-Dioxomolybdenum(Vi) Complexes Of Onn-Donor~Thiosemicarbazone, Berat İlhan Ceylan, Ayberk Yilmaz, Olcay Bölükbaşi Yalçinkaya, Bahri̇ Ülküseven
Turkish Journal of Chemistry
Cis-dioxomolybdenum(VI) chelate complexes with 5-chloro-2-hydroxybenzophenone S-methyl-4-phenylthiose- micarbazone (L) were synthesized in the general formula (MoO$_{2}$(L)D), where D is an odd- or even-numbered alcohol (methanol (1), ethanol (2), n-propanol (3), n-butanol (4), and allyl alcohol (5)). The structures of 1-5 were verified by elemental analysis, Fourier transform infrared (FT-IR), and $^{1}$H NMR spectra. Complex 5 crystallizes in the monoclinic space group P21/n, and its crystalline data showed a dimeric structure formed by a pair of intermolecular hydrogen bonds with 1.92 Å. These dimers are stacked in a similar crystalline structure as a single molecule. The experimental data were compared with the …
Antioxidant Potential And Secondary Reactivity Of Bis$\{$Diphenyl(2-Pyridyl)Phosphino$\}$Copper(Ii) Complex, Ezzat Khan, Adnan Shahzad, Muhammad Nawaz Tahir, Awal Noor
Antioxidant Potential And Secondary Reactivity Of Bis$\{$Diphenyl(2-Pyridyl)Phosphino$\}$Copper(Ii) Complex, Ezzat Khan, Adnan Shahzad, Muhammad Nawaz Tahir, Awal Noor
Turkish Journal of Chemistry
Copper-based complexes with the general formulas [Cu(L)$_{2}$]Cl$_{2}$ (1) and [Cu$_{2}$L$_{2}$($\mu_{2}$-L)$\mu_{2-}$Cl$_{2}$] (2) and a mixed-ligand anionic complex [Cu(L)$_{2}$dedtc][LCl] (3b), where L= diphenyl(2-pyridyl)phosphine and dedtc = diethyldithiocarbamate, were synthesized and structurally characterized. X-ray analysis revealed that the coordination environment around the copper atom in complexes 1-3 is distorted tetrahedral. In monomeric complexes 1 and 3b both diphenyl(2-pyridyl) phosphine ligands are monodentate and are coordinated through the P-atom. In complex 3b two phosphine ligands are attached to copper 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 …
A New Cocrystal Explosive Trinitrotoluene (Tnt):1-Amino-4-Bromonaphthalene With Reduced Sensitivity, Ni̇lgün Şen
A New Cocrystal Explosive Trinitrotoluene (Tnt):1-Amino-4-Bromonaphthalene With Reduced Sensitivity, Ni̇lgün Şen
Turkish Journal of Chemistry
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. Crystal structure determination studies indicated that the main mechanism of cocrystallization originates from the intermolecular hydrogen bonding (amino-nitro), halogen bonding, and $\pi -\pi $ stacking. Investigation of intermolecular interactions by Hirshfeld surface and fingerprint plot analysis revealed that the structures were stabilized by H...H, O...H, C...C ($\pi -\pi )$ and Br...O interactions. Hirshfeld surfaces showed that these weak interactions were significant for crystal packing. We analyzed the crystal packing and showed how this may influence …
Synthesis And Cytotoxicity Evaluation Of [(2,4-Dichlorophenoxy)Methyl]-5-Aryl-1,3,4-Oxadiazole/4$H$-1,2,4-Triazole Analogues, Mohamed Jawed Ahsan
Synthesis And Cytotoxicity Evaluation Of [(2,4-Dichlorophenoxy)Methyl]-5-Aryl-1,3,4-Oxadiazole/4$H$-1,2,4-Triazole Analogues, Mohamed Jawed Ahsan
Turkish Journal of Chemistry
We report herein the synthesis, characterization, and cytotoxicity evaluations of some newer oxadiazole and triazole analogues (5a-j). The cytotoxicity of all the title compounds were evaluated as per the National Cancer Institute protocol in a one-dose assay (10 $\mu $M) on nine different panels of 59 cancer cell lines. 2-$\{$5-[(2,4-Dichlorophenoxy)methyl]-1,3,4-oxadiazol-2-yl$\}$phenol (5e) showed the maximum cytotoxicity among the series of ten compounds. The cytotoxicity of 5e was comparable to that of the standard anticancer drug, 5-fluorouracil, and better than that of imatinib. The structure activity relationship was also discussed.
Synthesis And Biological Evaluation Of Quinoline-Triazole And Quinolone-Triazole Conjugates, Ayşegül Gümüş, Veysi̇ Okumuş
Synthesis And Biological Evaluation Of Quinoline-Triazole And Quinolone-Triazole Conjugates, Ayşegül Gümüş, Veysi̇ Okumuş
Turkish Journal of Chemistry
One-pot synthesis of novel quinoline- and quinolone-substituted 1,2,3-triazoles has been performed from the key intermediates, quinoline- and quinolone-substituted propargyl derivatives 1-3 (48%-88% yields). The antioxidant properties of the newly synthesized compounds, 1a-1c, 2a-2c, and 3a-3c, were evaluated by monitoring DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging abilities, metal chelating effects, and reducing power. The scavenging effects of compounds on the free radical decreased in the order of 3b$>$ 3a$>$ 1b} and were found to be 36.3%, 34.9%, and 27.6% at the concentration of 500 $\mu $g/mL, respectively. All of the compounds showed low chelating capacity. Furthermore, the antibacterial activity was studied …
Synthesis Of 2-Substituted 8-Propargyloxyquinoline Derivatives And Determination Of Their Antioxidant, Antibacterial, And Dna Binding Activities, Ayşegül Gümüş, Veysi̇ Okumuş, Selçuk Gümüş
Synthesis Of 2-Substituted 8-Propargyloxyquinoline Derivatives And Determination Of Their Antioxidant, Antibacterial, And Dna Binding Activities, Ayşegül Gümüş, Veysi̇ Okumuş, Selçuk Gümüş
Turkish Journal of Chemistry
2-Substituted 8-propargyloxyquinoline derivatives have been synthesized from 2-substituted-8-hydroxyquinolines by O-propargylation method (30%-98% yields). The newly synthesized compounds were tested for in vitro antioxidant activities such as DPPH radical scavenging, ferrous chelating, and reducing power activities. The maximum radical scavenging (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 $\mu $g/mL. To indicate DNA binding activity of the complexes calf thymus DNA was used. The compounds were also evaluated for their antimicrobial activity against three gram-positive and three gram-negative bacteria. Compounds 3 and 5 exhibited antibacterial …
Synthesis, Characterization, And Application Of Monodisperse Poly L-Dopa Microspheres, Azadeh Havasian, Elham Heydaripour, Mohammad Reza Nateghi, Mohammad Hossein Mosslemin, Forough Kalantari-Fotouh
Synthesis, Characterization, And Application Of Monodisperse Poly L-Dopa Microspheres, Azadeh Havasian, Elham Heydaripour, Mohammad Reza Nateghi, Mohammad Hossein Mosslemin, Forough Kalantari-Fotouh
Turkish Journal of Chemistry
In this study, 3,4-dihydroxy-L-phenylalanine (L-Dopa) was solvothermally polymerized to monodisperse microspheres 1 $\mu $m in diameter. Polymerization was carried out in dimethylformamide containing appropriate amounts of urea and L-Dopa at 120 $^{\circ}$C for 24 h. 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 microspheres synthesized by solvothermal method (with $\sim $1 $\mu $m average diameter) were clearly observable in SEM micrographs. The thermal stability of …
Synthetic Strategies Towards The Carbenoid Reactions Of $\Alpha ,\Beta $-Acetylenic Carbonyls, Füsun Şeyma Kişkan, Emre Özgüz, Olcay Anaç, Nurdan Tarakçi, Gökçe Merey
Synthetic Strategies Towards The Carbenoid Reactions Of $\Alpha ,\Beta $-Acetylenic Carbonyls, Füsun Şeyma Kişkan, Emre Özgüz, Olcay Anaç, Nurdan Tarakçi, Gökçe Merey
Turkish Journal of Chemistry
Catalytic reactions of $\alpha ,\beta $-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. In this study, efficient dioxole synthesis was carried out via acetylenic aldehydes and butadiene formation was preferred over cyclopropene formation via acetylenic esters as different functional groups on these substrates change the product distribution. Both reaction conditions (such as solvent and temperature) and electrophilic structure of metal carbenoids alter the product distribution; acceptor (A), donor-acceptor (DA), and acceptor-acceptor (AA) functionalized diazo compounds yield …
Investigation Of The Hydrogen Bond Donating Ability Of 1,8-Naphthalenediol By Nmr Spectroscopy And Its Use As A Hydrogen Bonding Catalyst, Yunus Emre Türkmen
Investigation Of The Hydrogen Bond Donating Ability Of 1,8-Naphthalenediol By Nmr Spectroscopy And Its Use As A Hydrogen Bonding Catalyst, Yunus Emre Türkmen
Turkish Journal of Chemistry
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 effective hydrogen bond donor compared to 1-naphthol and 8-methoxy-1-naphthol. Afterwards, its effectiveness as a hydrogen bonding catalyst was demonstrated in the Friedel-Crafts-type addition reaction of indole to trans-$\beta $-nitrostyrene.
A Novel Core-Shell-Based Chromatographic Method Supported By Ratio Derivative Spectrophotometry For The Simultaneous Determination Of Perindopril, Indapamide, And Amlodipine Ternary Mixtures, Leyla Karadurmuş, Mehmet Gümüştaş, Sevi̇nç Kurbanoğlu, Bengi̇ Uslu, Si̇bel Ayşil Özkan
A Novel Core-Shell-Based Chromatographic Method Supported By Ratio Derivative Spectrophotometry For The Simultaneous Determination Of Perindopril, Indapamide, And Amlodipine Ternary Mixtures, Leyla Karadurmuş, Mehmet Gümüştaş, Sevi̇nç Kurbanoğlu, Bengi̇ Uslu, Si̇bel Ayşil Özkan
Turkish Journal of Chemistry
}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. For chromatographic separations several mobile phase compositions were tested for efficient separation with the use of a new column technology related to superficially porous particles. Optimum chromatographic separation was achieved using a Kinetex C18 column (150 $\times $ 4.6 mm I.D. 5 $\mu $m) at a flow rate of 1.5 mL min$^{-1}$. The separation was carried out at 30 $^{\circ}$C and the diode array …
Recent Synthetic Methodologies For Pyrimidine And Its Derivatives, Farhat Ibraheem, Furqan Ahmad Saddique, Sana Aslam, Asim Mansha, Tahir Farooq, Matloob Ahmad
Recent Synthetic Methodologies For Pyrimidine And Its Derivatives, Farhat Ibraheem, Furqan Ahmad Saddique, Sana Aslam, Asim Mansha, Tahir Farooq, Matloob Ahmad
Turkish Journal of Chemistry
Pyrimidine derivatives are well known due to their remarkable pharmacological potential in various fields of science, and they are also present in some natural substances like DNA and RNA. These scaffolds manifest diversified biological activities such as antimicrobial, antiinflammatory, anti-HIV, antitubercular, antitumor, antineoplastic, and antimalarial. A pyrimidine ring is constructed when chalcones, amidines, guanidine, nitriles, isocyanates, urea, thiourea, and aminopyrazoles undergo condensation, coupling, or cyclization reactions. In this context, the present review illustrates a variety of novel and efficient synthetic approaches towards the synthesis of pyrimidine and its derivatives that were reported recently.
Fabrication And Electrochemical Performance Of La$_{0.595}$V$_{0.005}$Sr$_{0.4}$Mno$_{3-\Delta }$ (Lv05sm) Cathode Material For Solid Oxide Fuel Cells, Ayşenur Eslem Kisa, Oktay Demi̇rcan
Fabrication And Electrochemical Performance Of La$_{0.595}$V$_{0.005}$Sr$_{0.4}$Mno$_{3-\Delta }$ (Lv05sm) Cathode Material For Solid Oxide Fuel Cells, Ayşenur Eslem Kisa, Oktay Demi̇rcan
Turkish Journal of Chemistry
This study reports the effect of vanadium on the crystal structure and electrical and electrochemical properties of La$_{0.6-x}$V$_{x}$Sr$_{0.4}$MnO$_{3-\delta \, }(x =$ 0.005--0.1) perovskite-based cathode materials in solid oxide fuel cells. Crystal structure, morphology, and porosity of prepared cathode materials are characterized by X-ray diffraction, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy. Using XPS analysis it was established that the La$^{3+}$ cation is exchanged by the V$^{4+/5+}$ cation in the perovskite structure. This ion replacement improves the ionic conductivity and catalytic activity for oxygen reduction reaction in the perovskite structure, presumably due to the smaller size of the V$^{4+/5+}$ cation …
Synthesis, Spectroscopic Characterization, And Computational Studies Of 2-Cyano-6-Hydroxybenzothiazole: A Key Synthetic Intermediate Of Firefly Luciferin, Ghasem Shahmoradi, Saeid Amani
Synthesis, Spectroscopic Characterization, And Computational Studies Of 2-Cyano-6-Hydroxybenzothiazole: A Key Synthetic Intermediate Of Firefly Luciferin, Ghasem Shahmoradi, Saeid Amani
Turkish Journal of Chemistry
Firefly luciferin is widely applied as a biotechnological tool for visualizing various biological processes in vitro and in vivo. Chemically, 2-cyano-6-hydroxybenzothiazole, as a key synthetic intermediate of firefly luciferin, is obtained from 2-cyano-6-methoxybenzothiazole by changing the methoxy with a hydroxy group. However, this approach is costly and not suited for large-scale synthesis. 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. The cyanation reaction proceeds efficiently under mild conditions by using Cu(I)/Cu(II)/N,N,N\textquotesingle,N\textquotesingle-tetramethylethylenediamine as a catalyst. In addition, computational studies of the 2-cyano-6-hydroxybenzothiazole …
Synthesis Of $E$-Stilbene Azomethines As Potent Antimicrobial And Antioxidant Agents, Ahsan Iqbal, Zulfiqar Ali Khan, Sohail Anjum Shahzad, Muhammad Usman, Shakeel Ahmad Khan, Abdul H. Fauq, Ayesha Bari, Muhammad Aamir Sajid
Synthesis Of $E$-Stilbene Azomethines As Potent Antimicrobial And Antioxidant Agents, Ahsan Iqbal, Zulfiqar Ali Khan, Sohail Anjum Shahzad, Muhammad Usman, Shakeel Ahmad Khan, Abdul H. Fauq, Ayesha Bari, Muhammad Aamir Sajid
Turkish Journal of Chemistry
A series of new extensively conjugated $E$-stilbene azomethines (5a-5h) were synthesized and screened for their antioxidant and antimicrobial activity. The compounds were tested against bacterial (Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, and Bacillus subtilis) and fungal strains (Aspergillus niger, A. flavus, and Trichoderma harzianum) using the agar well diffusion method. Among the tested compounds, $N$'-(4-nitrobenzylidene)-2-(($E)$-styryl)benzohydrazide (5g) was found to possess potent antimicrobial activity higher than some drugs with significant activity reported in the literature, e.g., cefradine and terbinafine hydrochloride. Additionally, compounds 5a-5h were also evaluated for antioxidant potential using DPPH free radical scavenging and ferric thiocyanate (FTC) assays. Among these, …
Determination Of Morin On An Electrochemically Activated Carbon-Paste Electrode, Alexander Chebotarev, Konstantin Pliuta, Denys Snigur
Determination Of Morin On An Electrochemically Activated Carbon-Paste Electrode, Alexander Chebotarev, Konstantin Pliuta, Denys Snigur
Turkish Journal of Chemistry
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. The optimal conditions for the determination of morin (pH $=$ 4, E$_{ads\, }=$ 200~mV, t$_{ads\, }=$ 180 s) were established. Using square-wave voltammetry (A $=$ 35 mV, $\nu =$ 25 Hz, $\upsilon =$ 100 mV/s) it is possible to determine morin …
Effect Of Ph On The Complexation Of Irbesartan With $\Beta $-, Hydroxypropyl-$\Beta $-, And $\Gamma $-Cyclodextrin: Solubility Enhancement And Physicochemical Characterization, Fakhri Yousef
Turkish Journal of Chemistry
The affinity of irbesartan (IRB) to form inclusion complexes with $\beta $-cyclodextrin ($\beta $-CD), hydroxypropyl-$\beta $-cyclodextrin (HP-$\beta $-CD), and $\gamma $-cyclodextrin ($\gamma $-CD) was investigated in aqueous buffered solutions at pH 1.7, 4.1, and 7.0. Analysis of the UV absorption-pH profiles revealed that IRB has two p$K_{a}$ values: p$K_{a1\, }=$ 3.60 (imidazolinone ring moiety) and p$K_{a2\, }=$ 4.70 (tetrazole moiety). In the presence of 5.0 mmol L$^{-1} \beta $-CD, the tetrazole moiety became more acidic, indicating its inclusion within the $\beta $-CD cavity. Phase-solubility diagrams (PSDs) were obtained for IRB in aqueous buffered solutions of $\beta $-CD, HP-$\beta $-CD, and …
Synthesis And Investigation Of Langbeinite-Related Strontium- And Iron-Containing Phosphates, Nataliia Strutynska, Nikolai Slobodyanik, Anastasiia Shatalova
Synthesis And Investigation Of Langbeinite-Related Strontium- And Iron-Containing Phosphates, Nataliia Strutynska, Nikolai Slobodyanik, Anastasiia Shatalova
Turkish Journal of Chemistry
The partial substitution of potassium atoms by strontium atoms in initial matrix K$_{3}$Fe$_{2}$(PO$_{4})_{3}$ with formation of complex phosphates K$_{3-2x}$Sr$_{x}$Fe$_{2}$(PO$_{4})_{3}$ ($x =$ 0.75, 1.0, and 1.25) was determined using a solid-state reaction method. According to powder X-ray diffraction (XRD) data, the prepared phosphates with $x =$ 1.0 and 1.25 crystallize in a cubic system (space group ${P2}_{1}$3) and belong to langbeinite family compounds, while for the sample with $x =$ 0.75 a mixture of langbeinite-type phase and a minor amount of K$_{3}$Fe$_{2}$(PO$_{4})_{3}$ was obtained. The decreasing trend of lattice parameter $a$ with increase of Sr amount in the phosphate confirmed the …
Exploring Inhibition Of Chemiluminescence Mechanisms With Fluorescence Quenching Studies And Interaction Energy Calculations, Zhenbo Liu, Tangmi Yuan, Yongming Liu, Wenzuo Li, Qingzhong Li, Bo Xiao, Jianbo Cheng
Exploring Inhibition Of Chemiluminescence Mechanisms With Fluorescence Quenching Studies And Interaction Energy Calculations, Zhenbo Liu, Tangmi Yuan, Yongming Liu, Wenzuo Li, Qingzhong Li, Bo Xiao, Jianbo Cheng
Turkish Journal of Chemistry
Carbamates weaken the luminol-H$_{2}$O$_{2}$ chemiluminescence (CL) catalyzed by sodium copper chlorophyll (SCC). The capacity to inhibit the CL of three carbamates is in the order of carbaryl (CBL) \textgreater carbofuran (CBF) \textgreater metolcarb (MTC). Mechanisms of carbamates inhibiting SCC-luminol-H$_{2}$O$_{2}$ CL are investigated using fluorescence quenching and quantum chemistry simulations for the first time in this work. Carbamate-SCC interactions studied using fluorescence spectroscopy show that with the increasing concentration of the SCC, the fluorescence of carbamate is quenched regularly, and the quenching mechanism is a static quenching process. Binding constants ($K_{B})$ of the three carbamates with SCC are CBL (4.39 x …
4d-Qsar Analysis And Pharmacophore Modeling For Alkynylphenoxyacetic Acids As Crth2 (Dp2) Receptor Antagonists, Semi̇ha Köprü, Emi̇n Saripinar
4d-Qsar Analysis And Pharmacophore Modeling For Alkynylphenoxyacetic Acids As Crth2 (Dp2) Receptor Antagonists, Semi̇ha Köprü, Emi̇n Saripinar
Turkish Journal of Chemistry
In this study, we performed the pharmacophore modeling and 4D-QSAR research of alkynylphenoxyacetic acid analogues as CRTh2 receptor opponent agents by utilizing the electron conformational genetic algorithm method. Quantum chemical calculations and conformational analyses of the compounds were carried out at HF/6-31G* level. Then electron conformational matrices of congruity were prepared for each conformer of each compound, which are represented by electronic and structural properties. As a result of the comparison of the matrices that are called electron conformational submatrices of activity, the pharmacophoric group of the compounds responsible for the activity was found at the determined tolerance intervals. The …
An Efficient Water-Mediated Synthetic Route For The Alkylation Of Heteroarenes, Pinar Seyi̇tdanlioğlu, Essam Hamied Ahmed Hanashalhalshahaby, Canan Ünaleroğlu
An Efficient Water-Mediated Synthetic Route For The Alkylation Of Heteroarenes, Pinar Seyi̇tdanlioğlu, Essam Hamied Ahmed Hanashalhalshahaby, Canan Ünaleroğlu
Turkish Journal of Chemistry
An efficient synthetic route has been described for the alkylation of 1$H$-indole, 1$H$-benzimidazole, and 1$H$-benzotriazole. This approach features the alkylation of heteroaromatics through in situ generated enones from ketonic Mannich bases under metal-free conditions. A series of alkylated heteroaromatics have been synthesized via the K10 catalyzed alkylation reactions of these heteroaromatics with a variety of ketonic Mannich bases. Environmentally benign K10 catalyst, water-mediated mild reaction conditions, and the efficient synthesis of alkylated products are the advantages of this alkylation method.