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Synthesis And Characterization Of New Thiophene--Benzimidazole-Based Electrochromes, Emi̇ne Gül Cansu Ergün
Synthesis And Characterization Of New Thiophene--Benzimidazole-Based Electrochromes, Emi̇ne Gül Cansu Ergün
Turkish Journal of Chemistry
In the present study, two new donor--acceptor--donor-type molecules were synthesized and the electro-optical properties of the resulting monomers and their corresponding polymers were investigated. Thiophene was selected as the donor unit and cycloheptyl- and cyclooctyl- substituted benzimidazoles were used as the acceptor units. The synthesized monomers and their electrochemically obtained polymers were characterized using cyclic voltammetry and UV-Vis spectrometry. The optical band gap values of the polymers were 1.62 eV and the polymer films changed color to gray upon oxidation, while they were brick red in their neutral states. Moreover, changing the ring size on the acceptor group from seven …
Multiwall Carbon Nanotube Paste Electrode As A Sensor For Sensitive Determination Of Deferasirox In The Presence Of Uric Acid: Application For The Analysis Of Pharmaceutical And Biological Samples, Golnaz Parvizi Fard, Reza Emamali Sabzi
Multiwall Carbon Nanotube Paste Electrode As A Sensor For Sensitive Determination Of Deferasirox In The Presence Of Uric Acid: Application For The Analysis Of Pharmaceutical And Biological Samples, Golnaz Parvizi Fard, Reza Emamali Sabzi
Turkish Journal of Chemistry
In this work, the electrochemical oxidation of deferasirox at a multiwall carbon nanotube paste electrode (MWCNTPE) was described. The electrochemical behavior of deferasirox was studied using cyclic voltammetry and chronoamperometry techniques and parameters such as charge transfer coefficient ($\alpha )$, the number of electrons involved in the rate-determining step ($n_{a})$, and diffusion coefficient ($D)$ were calculated. The capability of the electrode for the determination of deferasirox at low concentrations was investigated using the differential pulse voltammetry technique. It was found that the calibration graph of deferasirox was linear in the concentration range of 0.16-16.5 $\mu $M and its detection limit …
Biological Evaluation And Synthesis Of New Pyrimidine-2(1h)-Ol/-Thiol Derivatives Derived From Chalcones Using The Solid Phase Microwave Method, Seda Fandakli, Nuran Kahri̇man, Tayyi̇be Beyza Yücel, Şengül Alpay Karaoğlu, Nuretti̇n Yayli
Biological Evaluation And Synthesis Of New Pyrimidine-2(1h)-Ol/-Thiol Derivatives Derived From Chalcones Using The Solid Phase Microwave Method, Seda Fandakli, Nuran Kahri̇man, Tayyi̇be Beyza Yücel, Şengül Alpay Karaoğlu, Nuretti̇n Yayli
Turkish Journal of Chemistry
Twenty-five new hydroxy- and methoxy-substituted 4,6-diarylpyrimidin-2(1H)-ol (20-34) and 4,6-diarylpyri\-midine-2(1H)-thiol derivatives (35-44) were synthesized from the reaction of the corresponding 1,3-diaryl-2-propene-1-one compounds (1-19) with urea or thiourea using the solid-phase microwave method. All the new synthetic compounds (20-44) were evaluated with regard to their $\alpha $-glucosidase activity. However, only compounds 22-25, 27,31,34, 35,37, and 40 exhibited a greater inhibitory effect than standard acarbose. The IC$_{50}$ values of the active compounds ranged between 2.36 and 13.34 $\mu $M. The 25 new compounds were also screened for their in vitro pancreatic lipase activity and compounds 20-27and 35-39 were found to be active. Of …
Synthesis Of Quaternized Zinc(Ii) And Cobalt(Ii) Phthalocyanines Bearing Pyridine-2-Yl-Ethynyl Groups And Their Dna Binding Properties, Maryam Moeini Alishah, Hacer Yasemi̇n Yeni̇lmez, İbrahi̇m Özçeşmeci̇, Behi̇ce Şebnem Sesalan, Zehra Altuntaş Bayir
Synthesis Of Quaternized Zinc(Ii) And Cobalt(Ii) Phthalocyanines Bearing Pyridine-2-Yl-Ethynyl Groups And Their Dna Binding Properties, Maryam Moeini Alishah, Hacer Yasemi̇n Yeni̇lmez, İbrahi̇m Özçeşmeci̇, Behi̇ce Şebnem Sesalan, Zehra Altuntaş Bayir
Turkish Journal of Chemistry
The synthesis and biological properties of tetra-substituted zinc and cobalt phthalocyanines bearing ethynylpy- ridine units on the periphery and their quaternized derivatives have been reported. The binding of quaternized ZnPc and CoPc (Q-ZnPc and Q-CoPc) with calf thymus DNA was investigated by UV-Vis spectrophotometric methods and thermodynamics. The mixtures of Q-ZnPc or Q-CoPc and DNA solutions were used to determine the change in the thermal melting temperature of DNA with the thermal denaturation profile. Thermodynamic parameters that show the spontaneity of the reactions between DNA and the quaternized phthalocyanines were investigated. K$_{b}$ binding constants at a degree of 10$^{5}$ and …
Schiff Base Of Isoniazid And Ketoprofen: Synthesis, X-Ray Crystallographic, Spectroscopic, Antioxidant, And Computational Studies, Naima Rehman, Muhammad Khalid, Moazzam Hussain Bhatti, Uzma Yunus, Ataualpa Albert Carmo Braga, Faiz Ahmed, Syed Muddassir Ali Mashhadi, Muhammad Nawaz Tahir
Schiff Base Of Isoniazid And Ketoprofen: Synthesis, X-Ray Crystallographic, Spectroscopic, Antioxidant, And Computational Studies, Naima Rehman, Muhammad Khalid, Moazzam Hussain Bhatti, Uzma Yunus, Ataualpa Albert Carmo Braga, Faiz Ahmed, Syed Muddassir Ali Mashhadi, Muhammad Nawaz Tahir
Turkish Journal of Chemistry
Ketoprofen and isoniazid together are a potential combination of a nonsteroidal antiinflammatory drug and an antitubercular medicine to treat tuberculosis and associated symptoms like fever and fatigue. The Schiff base of isoniazid with ketoprofen is synthesized in this research. Infrared spectroscopy (IR) and X-ray diffraction (XRD) analysis of the crystal packing proved the formation of the Schiff base and the existence of N-H$\cdot \cdot \cdot $O hydrogen bonds between the hydrogen-bonded dimer of the Schiff base. The complete geometrical optimization of the monomer and hydrogen-bonded dimer of the Schiff base is performed utilizing M06-2X/6-31G(d,p) level theory and compared with the …
Photocatalytic Degradation Of The Herbicide Quinclorac In Water Using Mn (Iii) Salen And Solar Light, Yisi Yang, Yan Zhang, Qingru Zeng
Photocatalytic Degradation Of The Herbicide Quinclorac In Water Using Mn (Iii) Salen And Solar Light, Yisi Yang, Yan Zhang, Qingru Zeng
Turkish Journal of Chemistry
Quinclorac (QNC) is a widely used herbicide and is persistent in surface and ground waters. Its residuals and converted products are hazardous to aquatic animals, vegetation, and microbes, and it is therefore important to degrade QNC using an efficient and environmental friendly technology. In this study, the photocatalytical degradation of QNC using [(R,R)-(N,N$'$-bis(3,5,3$'$,5$'$-tetra-tert-butylsalicylidene)-1,2-cyclohexanediaminato] manganese(III) acetate (Mn (III) salen) and H$_{2}$O$_{2}$ was performed under natural sunlight irradiation and a 91% degradation rate was achieved in neutral pure water in 240 min. The identified degradation products confirmed that the cleavage of QNC molecules was the main process involved in the hydroxylation, along …
One-Pot Synthesis Of Substituted 4$H$-Chromenes By Nickel Ferrite Nanoparticles As An Efficient And Magnetically Reusable Catalyst, Hamideh Ahankar, Ali Ramazani, Katararzyna Slepokura, Tadeusz Lis, Sang Woo Joo
One-Pot Synthesis Of Substituted 4$H$-Chromenes By Nickel Ferrite Nanoparticles As An Efficient And Magnetically Reusable Catalyst, Hamideh Ahankar, Ali Ramazani, Katararzyna Slepokura, Tadeusz Lis, Sang Woo Joo
Turkish Journal of Chemistry
Nickel ferrite magnetic nanoparticles (NiFe$_{2}$O$_{4}$ MNPs) were prepared via the autocombustion assisted sol-gel method. The efficient catalyst was investigated by FT-IR, XRD, ICP, SEM, and TEM techniques. A one-pot, three-component reaction is reported for the synthesis of substituted 4$H$-chromenes in the presence of NiFe$_{2}$O$_{4}$ MNPs as a reusable catalyst in a green solvent at 40 $^{\circ}$C under clean, efficient, and mild conditions. Furthermore, selected products were characterized by FT-IR, $^{1}$H NMR, and $^{13}$C NMR. The single-crystal X-ray analysis of product 4u was also conclusively confirmed. Easy workup procedure, high purity of products via simple recrystallization, and environmentally benign conditions are …
Enhanced Electrocatalytic Activity Of Copper Phthalocyanine/Multiwalled Carbon Nanotube Composite Electrode Via Pt Nanoparticle Modification For Oxygen Reduction, Çağri Ceylan Koçak, Zekerya Dursun
Enhanced Electrocatalytic Activity Of Copper Phthalocyanine/Multiwalled Carbon Nanotube Composite Electrode Via Pt Nanoparticle Modification For Oxygen Reduction, Çağri Ceylan Koçak, Zekerya Dursun
Turkish Journal of Chemistry
Enhanced electrocatalytic reduction of oxygen is achieved using Pt nanoparticle-modified copper phthalocya- nine-multiwalled carbon nanotube (PtNPs/CuPc-CNT) composite film on a glassy carbon electrode (PtNPs/CuPc-CNT/GCE). The PtNPs/CuPc-CNT/GCE surface is characterized by scanning electron microscopy, transmission electron microscopy, electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction. The electrocatalytic activity of composite electrodes in the oxygen reduction reaction is investigated by cyclic voltammetry and rotating-disk electrode measurements. PtNPs/CuPc-CNT/GCE show higher catalytic activity than CNT/GCE, CuPc/GCE, and CuPc-CNT/GCE in oxygen reduction with four electron transfers.
Recent Advances In Organ-On-A-Chip Technologies And Future Challenges: A Review, Hüseyi̇n Avci, Fatma Doğan Güzel, Sali̇m Erol, Ali̇ Akpek
Recent Advances In Organ-On-A-Chip Technologies And Future Challenges: A Review, Hüseyi̇n Avci, Fatma Doğan Güzel, Sali̇m Erol, Ali̇ Akpek
Turkish Journal of Chemistry
The significant development in the construction of microscale cell culture platforms and the interest in bioanalytical analysis have recently resulted in the emergence of a new concept of `organ-on-a-chip' systems. Organ-on-a-chip is a new three-dimensional (3D) in vitro microfabricated unit that contains a multichannel microfluidic cell culture. Even if many informative and useful data are obtained from animal models and in vitro assays, they are still limited for extrapolation to human systems during drug design and development. Only about 1 out of 10,000 compounds is processed in clinical trials for final approval. As being the first example of its kind, …
Synthesis And Characterization Of Novel Unsymmetrical Phthalocyanine/Tio$_{2}$ Composites And Their Evaluation As Photocatalysts For Degradation Of 4-Chlorophenol Under Visible Light, Yunus Alp Sütcüler, Görkem Gezek, Yaghub Mahmi̇ani̇, Altuğ Mert Sevi̇m
Synthesis And Characterization Of Novel Unsymmetrical Phthalocyanine/Tio$_{2}$ Composites And Their Evaluation As Photocatalysts For Degradation Of 4-Chlorophenol Under Visible Light, Yunus Alp Sütcüler, Görkem Gezek, Yaghub Mahmi̇ani̇, Altuğ Mert Sevi̇m
Turkish Journal of Chemistry
We prepared novel unsymmetrical A$_{3}$B-type zinc and cobalt phthalocyanines bearing monocarboxylic acid groups on peripheral positions using statistical condensation method, especially designed to anchor on the TiO$_{2}$ semiconductor surface. The novel complexes were anchored on TiO$_{2}$ semiconductor to prepare effective dye sensitized photoactive composites as heterogeneous catalysts. The results indicated that modified TiO$_{2}$ nanocrystals possessed only the anatase phase and MPc-TiO$_{2}$ photocatalysts with loading amount of dye ca. 8.27 $\mu $mol/g TiO$_{2}$ exhibit strong visible light absorption. Photocatalytic degradation of 4-chlorophenol (4-CP) under illumination with visible light ($\lambda >$ 400 nm) was tested with the composites prepared. The degradation profile …
Optimizing The Coagulation/Flocculation Process For Bentonite Suspension With Poly(Acrylamide-Co-(N-Methyl-4-Vinylpyridinium Tosylate, Brahim Bouras, Tayeb Hocine, Kamel Ismet Benabadji, Karim Benhabib, Ali Mansri
Optimizing The Coagulation/Flocculation Process For Bentonite Suspension With Poly(Acrylamide-Co-(N-Methyl-4-Vinylpyridinium Tosylate, Brahim Bouras, Tayeb Hocine, Kamel Ismet Benabadji, Karim Benhabib, Ali Mansri
Turkish Journal of Chemistry
In this work, we are interested in the quaternization of poly(acrylamide-co-4-vinylpyridine) [AM7/VP10/0.1%/] by the methyl-tosylate CH$_{3}$TS. The obtained copolymer poly(acrylamide-co-(N-methyl-4-vinylpyridinium tosylate)) [AM7/VP10/0.1%/CTs] has been characterized by $^{1}$H NMR and UV-Vis spectroscopy. The macromolecular weight was determined by size exclusion chromatography as well as by viscosity. With the aim of removing turbidity by coagulation-flocculation from bentonite suspensions, the prepared copolymer was used as a flocculant. Several important parameters in the flocculation process, such as pH of water, initial turbidity, and flocculant concentration, were utilized for the optimization of wastewater treatment. Flocculation experiments were carried out in a conventional jar test where …
Synthesis And Evaluation Of Novel 1,3,4-Thiadiazole--Fluoroquinolone Hybrids As Antibacterial, Antituberculosis, And Anticancer Agents, Asli Demi̇rci̇, Kaan Gökçe Karayel, Esra Tatar, Si̇nem Öktem Okullu, Ni̇han Ünübol, Paki̇ze Nesli̇han Taşli, Zühtü Tanil Kocagöz, Fi̇kretti̇n Şahi̇n, İlkay Küçükgüzel
Synthesis And Evaluation Of Novel 1,3,4-Thiadiazole--Fluoroquinolone Hybrids As Antibacterial, Antituberculosis, And Anticancer Agents, Asli Demi̇rci̇, Kaan Gökçe Karayel, Esra Tatar, Si̇nem Öktem Okullu, Ni̇han Ünübol, Paki̇ze Nesli̇han Taşli, Zühtü Tanil Kocagöz, Fi̇kretti̇n Şahi̇n, İlkay Küçükgüzel
Turkish Journal of Chemistry
A series of 5-substituted-1,3,4-thiadiazole-based fluoroquinolone derivatives were designed as potential antibacterial and anticancer agents using a molecular hybridization approach. The target compounds 16-25 were synthesized by reacting the corresponding $N$-(5-substituted-1,3,4-thiadiazol-2-yl)-2-chloroacetamides with ciprofloxacin or norfloxacin. The purity and identity of the synthesized compounds were determined by the use of chromatographic and spectral techniques (NMR, IR, MS, etc.) besides elemental analysis. Antibacterial, antituberculosis, and anticancer activity of the target compounds were evaluated against selected strains and cancer cell lines. Compound 20 was appreciated as the most active agent representing antibacterial activity against Escherichia coli and Staphylococcus aureus with MIC values of 4 …
Computational Investigation Of Intramolecular Reorganization Energy In Diketopyrrolopyrrole (Dpp) Derivatives, Şule Atahan Evrenk
Computational Investigation Of Intramolecular Reorganization Energy In Diketopyrrolopyrrole (Dpp) Derivatives, Şule Atahan Evrenk
Turkish Journal of Chemistry
Intramolecular reorganization energy (RE) of molecules derived from the diketopyrrolopyrrole (DPP) unit has been studied using B3LYP/6-31G(d,p) theory. It was found that the replacement of the oxygen atoms with sulfur in the DPP unit led to a smaller RE for both the hole and electron transfer processes. One disadvantage of the sulfur replacement is the twist of the conjugated backbone, which might impair the $\pi - \pi $ interactions in the solid state. The RE calculated from the adiabatic potential energy surfaces and that derived from the normal mode analysis agreed well for both systems. Electronic structure data showed that …
A Simple Automated Microplate Method For Determining Reducing Sugars In Food Extracts And Synthetic Serum Using Cupric-Neocuproine As Reductant, Mustafa Bener, Esi̇n Akyüz, Furkan Burak Şen, Kevser Sözgen Başkan, Esma Tütem, Mustafa Reşat Apak
A Simple Automated Microplate Method For Determining Reducing Sugars In Food Extracts And Synthetic Serum Using Cupric-Neocuproine As Reductant, Mustafa Bener, Esi̇n Akyüz, Furkan Burak Şen, Kevser Sözgen Başkan, Esma Tütem, Mustafa Reşat Apak
Turkish Journal of Chemistry
In the present work, a simple automated microplate method based on cupric ion reduction is described for determining total reducing sugars in food extracts and synthetic serum. The reaction of Cu(II)-Nc (cupric-neocuproine) with reducing sugars was performed in alkaline medium in microplates, and the absorbance of the formed highly colored Cu(I)-Nc chelate in a plate reader at 450 nm was recorded. The proposed method was applied to reducing sugars (glucose, fructose, galactose, maltose, and lactose) and their linear calibration curves were constructed. The detection and quantification limits (LOD and LOQ) for glucose were 0.14 and 0.46 $\mu $M, respectively. Absorbances …
Synthesis And Characterizations Of Novel Thiazolyl-Thiadiazole Derivatives As Telomerase Activators, İsmai̇l Kayaği̇l, Ayşe Gül Mutlu, Ülkü Bayhan, İnanç Yilmaz, Şeref Demi̇rayak
Synthesis And Characterizations Of Novel Thiazolyl-Thiadiazole Derivatives As Telomerase Activators, İsmai̇l Kayaği̇l, Ayşe Gül Mutlu, Ülkü Bayhan, İnanç Yilmaz, Şeref Demi̇rayak
Turkish Journal of Chemistry
Pyridine-3/4-thiocarboxamide derivatives were used as starting materials for the synthesis of the target compounds. The pyridine-3/4-thiocarboxamide derivatives were reacted with ethyl 2-chloroacetoacetate in ethanol to give the thiazole derivatives (1, 2). The two ethyl thiazole-carboxylate derivatives (1, 2) thus obtained were treated with sodium hydroxide solution and ethanol and converted to carboxylic acids (3, 4). The carboxylic acid derivatives (3, 4) were reacted with thiosemicarbazide in phosphoroxy trichloride and aminothiadiazole rings (5, 6) were formed. Thus, two thiazolyl-thiadiazole amine derivatives (5, 6) were obtained. These two derivatives (5, 6) were converted into two chloroacetamidothiadiazole derivatives (7, 8) by reaction with …
Synthesis Of Some Ketones Via Nano-Nickel Oxide Catalyzed Acylation Of Arylzinc Reagents; Strategy Involving The Use Of Mixed (Methyl)(Aryl)Zincs, Özgen Ömür Pekel, Ender Erdi̇k, Meli̇ke Kalkan
Synthesis Of Some Ketones Via Nano-Nickel Oxide Catalyzed Acylation Of Arylzinc Reagents; Strategy Involving The Use Of Mixed (Methyl)(Aryl)Zincs, Özgen Ömür Pekel, Ender Erdi̇k, Meli̇ke Kalkan
Turkish Journal of Chemistry
Nano-NiO catalyzed acylation of mixed (methyl)(aryl)zincs with aromatic acyl halides in THF at room temperature provides a new facile route for aryl-aroyl coupling. Among NiCl$_{2}$.L$_{2}$ and NiCl$_{2}$.L (L = monodentate and bidentate phosphine ligand) catalysts, the lower catalyst loading of NiCl$_{2}$ (dppf) may seem attractive; however, nano-NiO, being the lowest cost catalyst, is more favorable for aroylation of (methyl)(aryl)zincs. This procedure also provides a supplement to Cu and Pd catalyzed acylation of diorganozincs.
Removal Of Toxic Metals From Canola Oil By Newly Synthesized Calixarene-Based Resin, Muhammad Afzal Kamboh, Shahabuddi̇n Memon, Liaquat Ali Zardari, Hamid Rashidi Nodeh, Syed Tufail Hussain Sherazi, Mustafa Yilmaz
Removal Of Toxic Metals From Canola Oil By Newly Synthesized Calixarene-Based Resin, Muhammad Afzal Kamboh, Shahabuddi̇n Memon, Liaquat Ali Zardari, Hamid Rashidi Nodeh, Syed Tufail Hussain Sherazi, Mustafa Yilmaz
Turkish Journal of Chemistry
This study describes the synthesis, characterization, and application of a new $p-$sulfonatocalix[4]arene-based silica resin (calix-resin 5) for the extraction of selected metals, namely Pb, Cd, Co, Ni, Cu and Fe, from canola oil. Synthesis, morphology, purity, and elemental composition of calix-resin 5 were analyzed by FT-IR spectroscopy, scanning electron microscopy, and energy-dispersive spectroscopy. The metal extraction efficiency of calix-resin 5 was evaluated through the batch-wise method with a flame and graphite furnace atomic absorption spectrometer following the wet acid digestion procedure. The results obtained showed that the newly fabricated adsorbent material calix-resin 5 is an efficient adsorbent and exhibits great …
Electrochemical Behavior And Voltammetric Determination Of Some Nitro-Substituted Benzamide Compounds, Özlem Sağlam, Ferah Cömert Önder, Tuğba Güngör, Mehmet Ay, Yusuf Di̇lgi̇n
Electrochemical Behavior And Voltammetric Determination Of Some Nitro-Substituted Benzamide Compounds, Özlem Sağlam, Ferah Cömert Önder, Tuğba Güngör, Mehmet Ay, Yusuf Di̇lgi̇n
Turkish Journal of Chemistry
Voltammetric behaviors of six nitro-substituted benzamides, which are potential prodrug candidates for nitroreductase-based cancer therapy, were investigated using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The electrochemical behavior of aromatic nitro (ArNO$_{2})$ compounds by CV indicates that compounds involve various reduction/oxidation steps including the formation of aromatic nitro radical, nitroso, hydroxylamine, and amine groups. Applicability of the voltammetric determination of these prodrug candidates was studied by recording their DPVs, carried out in mixed media (Britton Robinson buffer solution $+$ DMF) at various pH values on a pencil graphite electrode (PGE). Results show that the PGE can offer a disposable, …
An Ionic Liquid/Bismuth Film-Modified Sensor For The Electrochemical Detection Of Cefixime, Yeşi̇m Tuğçe Yaman, Gülçi̇n Bolat, Ceren Yardimci, Serdar Abaci
An Ionic Liquid/Bismuth Film-Modified Sensor For The Electrochemical Detection Of Cefixime, Yeşi̇m Tuğçe Yaman, Gülçi̇n Bolat, Ceren Yardimci, Serdar Abaci
Turkish Journal of Chemistry
A highly sensitive and simple method based on an ionic liquid/ex situ bismuth film-modified single-use pencil graphite electrode (IL/Bi/PGE) was offered for the electrochemical detection of cefixime (CEF) for the first time. The synergistic effects of the ionic liquid and bismuth film combination as the surface modifier remarkably improved the electrochemical response of the modified sensor. Anodic oxidation of CEF was observed at 0.9 V vs. Ag/AgCl/3 M KCl as one well-defined irreversible oxidation peak. Under optimum experimental conditions, the IL/Bi/PGE exhibited a linear relationship for CEF concentrations in the range of 0.005--0.5 $\mu $M (R$^{2}$ = 0.996) with a …
The First Synthesis And Antioxidant And Anticholinergic Activities Of 1-(4,5-Dihydroxybenzyl)Pyrrolidin-2-One Derivative Bromophenols Including Natural Products, Mohsen Rezai̇, Çeti̇n Bayrak, Parham Tasli̇mi̇, İlhami̇ Gülçi̇n, Abdullah Menzek
The First Synthesis And Antioxidant And Anticholinergic Activities Of 1-(4,5-Dihydroxybenzyl)Pyrrolidin-2-One Derivative Bromophenols Including Natural Products, Mohsen Rezai̇, Çeti̇n Bayrak, Parham Tasli̇mi̇, İlhami̇ Gülçi̇n, Abdullah Menzek
Turkish Journal of Chemistry
We report herein the first synthesis of biologically active natural bromophenols, namely 1-(2,3,6-tribromo-4,5-dihydroxybenzyl)pyrrolidin-2-one (2), 2RS-1-(2,3-dibromo-4,5-dihydroxybenzyl)-5-oxopyrrolidine-2-carboxylic acid (3), and 2RS-methyl 1-(2,3-dibromo-4,5-dihydroxybenzyl)-5-oxopyrrolidine-2-carboxylate (4), along with their different derivatives (6 and 8-18). Among the synthesized compounds, , 4, and their derivatives (8 and 9) are yielded in racemic form. Radical scavenging assays of the synthesized molecules were investigated using various bioanalytical antioxidant methods including 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS$^{\bullet +})$ and 2,2-diphenyl-1-picrylhydrazyl (DPPH$^{\bullet })$. In addition, the reducing power of the novel bromophenols was investigated by Cu$^{2+}$-Cu$^{+}$ reducing, Fe$^{3+}$-Fe$^{2+}$ reducing, and [Fe$^{3+}$-(TPTZ)$_{2}$]$^{3+}$-[Fe$^{2+}$-(TPTZ)$_{2}$]$^{2+}$ reducing capacity and ferrous ions (Fe$^{2+})$ chelating abilities. The molecules demonstrated powerful …
Anticorrosion Coating For Magnesium Alloys: Electrospun Superhydrophobic Polystyrene/Sio$_{2}$ Composite Fibers, Nesri̇n Horzum Polat, Özlem Kap, Ami̇r Farzaneh
Anticorrosion Coating For Magnesium Alloys: Electrospun Superhydrophobic Polystyrene/Sio$_{2}$ Composite Fibers, Nesri̇n Horzum Polat, Özlem Kap, Ami̇r Farzaneh
Turkish Journal of Chemistry
Superhydrophobic nanocomposite coatings for magnesium surfaces with remarkable corrosion resistance were fabricated by electrospinning in the presence of fluorosilane-functionalized silica (SiO$_{2})$ nanoparticles. The effects of surface-modified silica (mod-SiO$_{2})$ nanoparticles on the superhydrophobicity and corrosion resistance of polystyrene (PS)/mod-SiO$_{2}$ fiber coatings were evaluated. The incorporation of the SiO$_{2}$ nanoparticles endows PS fibers with rough surfaces exhibiting a water contact angle (WCA) of 165$^{\circ}$. The surface wettability, corrosion resistance, and their relation to the inorganic content in the PS fibers and the contact angle of the composite coatings were explored. Analysis of the corrosion results confirmed that the PS/mod-SiO$_{2}$ coating protected the …
Voltammetric Determination Of Phenmedipham Herbicide Using A Multiwalled Carbon Nanotube Paste Electrode, Ersi̇n Demi̇r, Recai̇ İnam
Voltammetric Determination Of Phenmedipham Herbicide Using A Multiwalled Carbon Nanotube Paste Electrode, Ersi̇n Demi̇r, Recai̇ İnam
Turkish Journal of Chemistry
Phenmedipham is an herbicide used especially in the sugar beet harvest to fight against broad-leaved weeds and studies of its voltammetric behavior and detection have not been done before. The superior properties of carbon nanotubes such as electrical conductivity, mechanical strength, and wide potential ranges make them attractive for chemical sensors and the phenmedipham compound gave an oxidation peak at $+$1320 mV (vs. Ag/AgCl) on the nanostructured multiwalled carbon nanotube paste electrode. Square wave voltammetric measurements recorded for phenmedipham showed that the peak current increased linearly between 0.02 and 2.0 mg/L with a regression coefficient of $r$ = 0.9989, and …
A Novel One-Pot And Rapid Synthesis Of Polyfunctionalized Benzo[A]Pyrimido[5',4':5,6] Pyrido[2,3-C]Phenazine Derivatives Under Microwave Irradiation, Mahdieh Tabibian, Razieh Mohebat, Masoumeh Tabatabaee
A Novel One-Pot And Rapid Synthesis Of Polyfunctionalized Benzo[A]Pyrimido[5',4':5,6] Pyrido[2,3-C]Phenazine Derivatives Under Microwave Irradiation, Mahdieh Tabibian, Razieh Mohebat, Masoumeh Tabatabaee
Turkish Journal of Chemistry
A one-pot, environmentally friendly, and efficient protocol for the synthesis of novel polyfunctionalized benzo[$a$]pyrimido[5',4':5,6]pyrido[2,3-$c$]phenazine derivatives has been reported by a one-pot, four-component sequential reaction between 2-hydroxynaphthalene-1,4-dione, benzene-1,2-diamines, benzaldehydes, and 6-amino-1,3-dimethyluracil in the presence of $p$-TSA as a nontoxic, inexpensive, ecofriendly, and efficacious solid acid catalyst. Two C-C bonds, two C=N bonds, and one C-N bond, as well as two new rings, were formed in this reaction. Through this procedure, compounds with substantial biological and pharmaceutical properties are generated in a single operation. Factors such as high yields, less reaction time, operational simplicity, and lack of any dangerous reagents/solvents have made …
Solid-Phase Extraction Method For Preconcentration Of Cadmium And Lead In Environmental Samples Using Multiwalled Carbon Nanotubes, Ayman A. Gouda, Wael A. Zordok
Solid-Phase Extraction Method For Preconcentration Of Cadmium And Lead In Environmental Samples Using Multiwalled Carbon Nanotubes, Ayman A. Gouda, Wael A. Zordok
Turkish Journal of Chemistry
A new sensitive and accurate solid-phase extraction method for preconcentration of trace amounts of cadmium and lead in various environmental samples prior to flame atomic absorption spectrometry determination has been developed. The proposed method is based on the utilization of multiwalled carbon nanotubes in combination with 5-benzyl-4-[-chlororbenzylidene amine]-4H-1,2,4-triazole-3-thiol (BCBATT) as a solid-phase sorbent with the aid of ultrasonication. The effect of the preconcentration parameters was investigated. Good recoveries ranging from 95% to 102% with relative standard deviations of 3.2% and 2.8% for Cd$^{2+}$ and Pb$^{2+}$, respectively, were obtained, indicating high accuracy and precision. The limits of detection were 0.2 and …
Facile Synthesis Of Iro$_{2}$ Nanoclusters And Their Application As Catalysts In The Degradation Of Azo Dyes, Rajni Lasyal, Anjali Goel
Facile Synthesis Of Iro$_{2}$ Nanoclusters And Their Application As Catalysts In The Degradation Of Azo Dyes, Rajni Lasyal, Anjali Goel
Turkish Journal of Chemistry
A robust synthesis of iridium oxide (IrO$_{2})$ nanoclusters using methanol as a reducing agent via the chemical reduction method is reported in this article. Polyvinylpyrrolidone (PVP) and polyoxyethylene(23) lauryl ether (POLE) were used as stabilizers. The formation of IrO$_{2}$ nanoclusters was confirmed by the appearance of new absorption peak at 230 nm in UV-vis spectra. XRD and TEM were used to determine the degree of crystallinity and size of nanoclusters, respectively. Further characterization studies were carried out by FT-IR spectroscopy to investigate the coordination between IrO$_{2}$ nanoclusters and stabilizers. The size of the nanoclusters was found to be a factor …
The Synthesis Of New 3,4-(Bisaryl)-1,8-Naphthalimide And 2,3-(Bisaryl)-7$H$-Benzimidazo[2,1-A]Benzo[D]Isoquinolin-7-One Compounds And An Investigation Of Their Photochromic Properties, Ersi̇n Orhan, Mahmut Köse, Tolga Yazan
The Synthesis Of New 3,4-(Bisaryl)-1,8-Naphthalimide And 2,3-(Bisaryl)-7$H$-Benzimidazo[2,1-A]Benzo[D]Isoquinolin-7-One Compounds And An Investigation Of Their Photochromic Properties, Ersi̇n Orhan, Mahmut Köse, Tolga Yazan
Turkish Journal of Chemistry
Three new photochromic compounds, 3-(2,5-dimethyl-3-thienyl)-4-(2-phenyl-5-methyl-4-thiazolyl)-1,8-napht- halimide (1-O), 2,3-bis(2-phenyl-5-methyl-4-thiazolyl)-7$H$-benzimidazo[2,1-a]benzo[de]isoquinolin-7-one (2-O), and 2,5-dimethyl-3-thienyl)-7$H$-benzimidazo[2,1-a]benzo[de]isoquinolin-7-one (3-O), were synthesized and their photochromic properties were studied. 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 of the structures) on exposure to UV light at 365 nm in ethyl acetate solutions. The colored solutions can be reversed to …
One-Step Potentiostatic Codeposition And Electrochemical Studies Of Poly(1-Pyrenyl)-2,5-Di(2-Thienyl)Pyrrole-Co-Pyrrole) Film For Electrochemical Supercapacitors, Hakan Görçay, İlhami̇ Çeli̇k, Yücel Şahi̇n
One-Step Potentiostatic Codeposition And Electrochemical Studies Of Poly(1-Pyrenyl)-2,5-Di(2-Thienyl)Pyrrole-Co-Pyrrole) Film For Electrochemical Supercapacitors, Hakan Görçay, İlhami̇ Çeli̇k, Yücel Şahi̇n
Turkish Journal of Chemistry
In this paper, we report a simple, low-cost, and environmentally friendly electrochemical method to obtain a novel copolymer consisting of 1-pyrenyl-2,5-di(2-thienyl)pyrrole and pyrrole on a pencil graphite electrode (PGE). Poly(1-pyrenyl)-2,5-di(2-thienyl)pyrrole-co-pyrrole) that is P(PyrPy-co-Py) film was prepared by one-step potentiostatic codeposition in an ethanol solution containing PyrPy and Py monomers for supercapacitor applications. The electrodeposition of homopolymer and copolymer modified electrodes was carried out on the surface of the PGE via chronocoulometry. For comparison, P(Py)/PGE and P(PyrPy)/PGE were also electrochemically synthesized under the same reaction conditions. The surface morphologies of all the electrode materials were analyzed by field emission scanning electron …
Analysis Of Electrochemical Noise In Nicd Batteries Throughout Their Lifetime, Burak Ülgüt
Analysis Of Electrochemical Noise In Nicd Batteries Throughout Their Lifetime, Burak Ülgüt
Turkish Journal of Chemistry
Electrochemical noise measurements have been applied to electrochemical systems that show stochastic behavior. The standard area of study that benefits from this stochastic analysis is localized corrosion modes like pitting and crevice corrosion. Application of electrochemical noise measurements to battery systems, though rare, is recently becoming more popular. The present contribution first establishes a method of analyzing electrochemical voltage noise data for NiCd batteries, then follows four samples of batteries in terms of voltage noise throughout their lifetimes. The noises exhibited by battery systems are small, but finite. This noise is expected to be due to variations in the electrochemistry …
Differential Pulse Voltammetric Determination Of Dopamine Using Pd Nanoparticles Deposited On (3-Aminopropyl)Triethoxysilane Functionalized Ceo$_{2}$ Nanoparticles, Muhammet Güler
Turkish Journal of Chemistry
In this study, a novel and effective electrochemical sensor for determination of dopamine (DA) was successfully developed by the modification of a glassy carbon electrode (GCE) using Pd nanoparticles deposited on (3-aminopropyl)triethoxysilane functionalized nanoceria (Pd@CeO$_{2}$-APTES) and nafion used as a protective membrane. The synthesized nanocomposites were evaluated using X-ray diffraction, high-resolution transmission electron microscopy, and Fourier transform infrared spectroscopy. Moreover, the electrochemical properties of the modified electrodes were investigated 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 $\mu $M for DA by DPV with a notable sensitivity of 3.89 …
The Design And Synthesis Of A Photo-Controlled, Peptide-Based Potential Drug Carrier, Melek Parlak Khali̇ly, Sali̇h Özçubukçu
The Design And Synthesis Of A Photo-Controlled, Peptide-Based Potential Drug Carrier, Melek Parlak Khali̇ly, Sali̇h Özçubukçu
Turkish Journal of Chemistry
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 a storage site for poorly water-soluble drugs. Moreover, anthracenes that come in close proximity with the formation of micellar structures can undergo photodimerization upon irradiation at 365 nm, which disrupts the micelle structures formed by the self-assembly of the peptide amphiphiles. …