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Kinetics Of Silver(I)-Catalyzed Oxidation Of Allyl Alcohol By Peroxodiphosphate Inacetate Buffers, Priyamvada Sharma, Riya Sailani, Deepmala Pareek, Chandra Lata Khandelwal
Kinetics Of Silver(I)-Catalyzed Oxidation Of Allyl Alcohol By Peroxodiphosphate Inacetate Buffers, Priyamvada Sharma, Riya Sailani, Deepmala Pareek, Chandra Lata Khandelwal
Turkish Journal of Chemistry
The kinetics and mechanism of silver(I)-catalyzed oxidation of allyl alcohol with peroxodiphosphate in acetate buffers have been studied. The rate is independent of allyl alcohol concentration. The effect of other reaction parameters such as hydrogen and acetate ions has also been studied. The rate law accounting for all experimental observations corresponds to the proposed mechanism. The energy and entropy of activation have also been evaluated by employing Eyring plots.
Development Of A Molecularly Imprinted Polymer-Based Electrochemical Sensor For Tyrosinase, Aysu Yarman
Development Of A Molecularly Imprinted Polymer-Based Electrochemical Sensor For Tyrosinase, Aysu Yarman
Turkish Journal of Chemistry
For the first time a molecularly imprinted polymer (MIP)-based sensor for tyrosinase is described. This sensor is based on the electropolymerization of scopoletin or o-phenylenediamine in the presence of tyrosinase from mushrooms, which has a high homology to the human enzyme. The template was removed either by treatment with proteinase K or by alkaline treatment. The measuring signal was generated either by measuring the formation of a product by the target enzyme or by evaluation of the permeability of the redox marker ferricyanide. The o-phenylenediamine-based MIP sensor has a linear measuring range up to 50 nM of tyrosinase with a …
Electrochemical Polymerization Of A New Alkoxy-Bridged Dithieno (3,2-B:2',3'-D) Pyrrole Derivative, Ari̇f Kivrak, Hüseyi̇n Beki̇r Yildiz, Selahatti̇n Gökyer, Buket Çarbaş
Electrochemical Polymerization Of A New Alkoxy-Bridged Dithieno (3,2-B:2',3'-D) Pyrrole Derivative, Ari̇f Kivrak, Hüseyi̇n Beki̇r Yildiz, Selahatti̇n Gökyer, Buket Çarbaş
Turkish Journal of Chemistry
A novel alkoxy-bridged dithieno (3, 2-B:2',3'-D) pyrrole (DTP) derivative was synthesized and its corresponding polymer poly(1,2-bis(2-(4H-dithieno[3,2-b:2',3'-d]pyrrol-4-yl)ethoxy)ethane) (P(DTP-alkoxy-DTP)) was successfully obtained electrochemically. The effects of alkoxy bridge in the structure on the electrochemical and spectroelectrochemical properties of the polymer were also investigated in detail. The results showed that the polymer film exhibits multielectrochromic behavior and a low band gap of 1.82 eV.
Synthesis, Solvatochromism, And Biological Activity Of Novel Azo Dyes Bearing 2-Pyridone And Benzimidazole Moieties, Dusan Mijin, Biljana Bozic Nedeljkovic, Bojan Bozic, Ilijana Kovrlija, Jelena Ladarevic, Gordana Uscumlic
Synthesis, Solvatochromism, And Biological Activity Of Novel Azo Dyes Bearing 2-Pyridone And Benzimidazole Moieties, Dusan Mijin, Biljana Bozic Nedeljkovic, Bojan Bozic, Ilijana Kovrlija, Jelena Ladarevic, Gordana Uscumlic
Turkish Journal of Chemistry
New azo dyes bearing 2-pyridone and benzimidazole moieties were prepared using diazotization of 4-(1H-benzo[d]imidazol-2-yl)aniline and coupling of the obtained diazonium salt with substituted 3-cyano-2-pyridones. Obtained compounds were characterized via UV-Vis, FT-IR, and $^{1}$H and $^{13}$C NMR spectroscopy as well as by elemental analysis data. The UV-Vis spectra of the synthesized dyes were measured in thirteen solvents of different properties at room temperature. Solvatochromism and tautomerism of novel azo dyes were discussed. An MTT (3,4,5-dimethyl-thiazol-2-yl)-2,5-diphenyl tetrazolium bromide) test was performed to prove the biocompatibility of the investigated dyes. The investigated dyes exhibited satisfying antiproliferative activities against both tumor cell lines, MDA-MB-231 …
New Triplet Silylenes M-Si-M$'$--X Along With Some Unusual Cyclic Forms (M = Li, Na, And K; M$'$ = Be, Mg, And Ca; X = F, Cl, And Br), Samaneh Ashenagar, Mohamad Zaman Kassaee
New Triplet Silylenes M-Si-M$'$--X Along With Some Unusual Cyclic Forms (M = Li, Na, And K; M$'$ = Be, Mg, And Ca; X = F, Cl, And Br), Samaneh Ashenagar, Mohamad Zaman Kassaee
Turkish Journal of Chemistry
Comparison of 54 M-Si--M$'$-X species is carried out using quantum mechanical ab initio and DFT computations at B3LYP/6-311$++$G**, QCISD(T)/6-311$++$G**, and CCSD(T)/6-311$++$G** levels of theory (M = Li, Na, K; M$'$ = Be, Mg, Ca, and X = F, Cl, Br). All triplet species with M = K appear more linear than their corresponding ones with Li and Na. The electronegativity reactivity descriptor for each halogen (X = F, Cl, Br) is used as a tool to evaluate the interrelated properties of these silylenes. Stability, assumed as singlet-triplet energy difference ($\Delta E_{S-T})$ for each series depends on the substituent's electropositivity, analyzed …
Development Of A Nanoscale-Based Optical Chemical Sensor For The Detection Of No Radical, Özlem Öter, Aki̇f Ci̇han Aydin, Merve Zeyrek Ongun, Erdal Çeli̇k
Development Of A Nanoscale-Based Optical Chemical Sensor For The Detection Of No Radical, Özlem Öter, Aki̇f Ci̇han Aydin, Merve Zeyrek Ongun, Erdal Çeli̇k
Turkish Journal of Chemistry
Nitric oxide is one of the most important biochemical parameters in biological processes; it is also known as carcinogenic. There is need for the design of stable and durable solid phase nitric oxide sensors. In this study, we immobilized the nitric oxide sensitive molecules pyrene, tris(2,2'-bipyrdyl)dichlororuthenium(II) hexahydrate (Ru(bipy)$_{3}^{2+})$, and magnesium phthalocyanine (Mg-Pc) for the first time in polymeric or glassy matrices. We applied silver nanoparticles and ionic liquids in the fabrication process of polymeric electrospun fibers and thin films. We compared their NO sensitivity in micelle solutions that mimic the cell medium by both steady state and lifetime-based fluorescence measurements. …
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 …
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 …
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 …
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 …
Hybrid Organic Molecules As Antiinammatory Agents; A Review Of Structuralfeatures And Biological Activity, Noor Ul Amin Mohsin, Matloob Ahmad
Hybrid Organic Molecules As Antiinammatory Agents; A Review Of Structuralfeatures And Biological Activity, Noor Ul Amin Mohsin, Matloob Ahmad
Turkish Journal of Chemistry
Nonsteroidal antiin ammatory drugs (NSAIDs) are widely used for the treatment of pain and in ammation. Some undesirable effects are linked with NSAIDs such as the gastrointestinal tract (GIT) toxicity and cardiovascular disturbances. At present the preparation of a hybrid molecular technique is being used to produce new analgesic and antiin ammatory molecules. Attachment of NSAIDs with nitric oxide and hydrogen sulfide releasing molecules produced some gastroprotective agents with improved analgesic and antiinflammatory activities. Combination of NSAIDs with different biologically active 5-membered, 6-membered, and condensed heterocyclic rings has also led to the formation of some potent molecules. Some of these …
Synthesis Of Benzaldehyde By Swern Oxidation Of Benzyl Alcohol In A Continuous Flow Microreactor System, Lin Zhu, Xiaohui Xu, Fuping Zheng
Synthesis Of Benzaldehyde By Swern Oxidation Of Benzyl Alcohol In A Continuous Flow Microreactor System, Lin Zhu, Xiaohui Xu, Fuping Zheng
Turkish Journal of Chemistry
Preparation of benzaldehyde by Swern oxidation of benzyl alcohol was carried out in a continuous flow microreactor system. Dimethyl sulfoxide (Me2SO) was used as oxidizing agent and oxalyl chloride or p-toluenesulfonyl (p-TsCl) chloride was used as the activating agent. Benzyl alcohol was oxidized to benzaldehyde by the Me2SO-activating agent mixture in the continuous flow microreactor system. The optimized reaction conditions of the Swern oxidation were as follows: oxalyl chloride was used as the activating agent; the mole ratio of Me2SO, oxalyl chloride, and benzyl alcohol was 4:2:1; the ow rate of Me2SO was 1.5 mL/min; the reaction temperature was 15 …
Facile Synthesis Of Heteroaryl Substituted -Lactams From Nitrovinyl Arenes, Seda Çinar, Canan Ünaleroğlu
Facile Synthesis Of Heteroaryl Substituted -Lactams From Nitrovinyl Arenes, Seda Çinar, Canan Ünaleroğlu
Turkish Journal of Chemistry
Aliphatic nitroalkanes with different functional groups were synthesized from the Michael addition reactions of active methylene compounds 2 and nitrovinyl arenes 1 in high yields. The synthesized Michael adducts were subjected to intramolecular cyclization to give heteroaryl substituted γ-lactams in good to high yields under mild reaction conditions.
One-Pot Synthesis Of New N-(1-Methylpyridin-4(1h)-Ylidene)Amine Ligands Forpalladium-Catalyzed Heck Coupling Reaction, Muhammad Zafar, Sabeen Zahra, Muhammad Tahir, Ehsan Mughal, Muhammad Nazar, Hummera Rafique
One-Pot Synthesis Of New N-(1-Methylpyridin-4(1h)-Ylidene)Amine Ligands Forpalladium-Catalyzed Heck Coupling Reaction, Muhammad Zafar, Sabeen Zahra, Muhammad Tahir, Ehsan Mughal, Muhammad Nazar, Hummera Rafique
Turkish Journal of Chemistry
A series of new derivatives of N-(1-methylpyridin-4(1H)-ylidene)amines, [L1]-[L5], were synthesized and characterized by FTIR, NMR, MS, and XRD analysis. These targeted compounds were synthesized by the melt reaction between N-methylated-4-chloropyridinium triflate and corresponding amines (1-naphthyl amine, o-ansidine, 2-nitroaniline, p-ansidine, and cyclohexyl amine) followed by the addition of sodium hydride in dichloromethane in the same pot. These highly electron-donating N-(1-methylpyridin-4(1H)-ylidene)amine ligands considerably improve the catalytic activity of palladium acetate towards Heck-Mizoroki carbon-carbon cross-coupling reactions.
Biological Study On Novel Coumarinyl 1,3,4-Oxadiazoles, Maja Molnar, Ana Amic, Valentina Pavic, Tihomir Kovac, Marija Kovac, Elizabeta Has-Schön
Biological Study On Novel Coumarinyl 1,3,4-Oxadiazoles, Maja Molnar, Ana Amic, Valentina Pavic, Tihomir Kovac, Marija Kovac, Elizabeta Has-Schön
Turkish Journal of Chemistry
Coumarinyl 1,3,4-oxadiazoles were synthesized from Schiff bases and acetic anhydride. All compounds were characterized by melting points and their structures confirmed by mass and $^{1}$H and $^{13}$C NMR spectrometry. These novel coumarinyl derivatives were subjected to antibacterial, antifungal, anta atoxigenic, and antioxidant activity. Their activity varied depending on their structure, where 2-(3-acetyl-5-(((4-methyl-2-oxo-2H-chromen-7-yl)oxy)methyl)- 2,3-dihydro-1,3,4-oxadiazol-2-yl)-1,4-phenylene diacetate showed significant antioxidant and antibacterial activity on B. subtilis. 4-(3-Acetyl-5-(((4-methyl-2-oxo-2H-chromen-7-yl)oxy)methyl)-2,3-dihydro-1,3,4-oxadiazol-2-yl)-1,2-phenylene diacetate was found to possess excellent antifungal and antia atoxigenic activity.
Cu(Ii) Immobilized On Fe$_{3}$O$_{4}$ @Agarose Nanomagnetic Catalyst Functionalizedwith Ethanolamine Phosphate-Salicylaldehyde Schiff Base: A Magnetically Reusablenanocatalyst For Preparation Of 2-Substituted Imidazolines, Oxazolines, Andthiazolines, Zeinab Zarei, Batool Akhlaghinia
Cu(Ii) Immobilized On Fe$_{3}$O$_{4}$ @Agarose Nanomagnetic Catalyst Functionalizedwith Ethanolamine Phosphate-Salicylaldehyde Schiff Base: A Magnetically Reusablenanocatalyst For Preparation Of 2-Substituted Imidazolines, Oxazolines, Andthiazolines, Zeinab Zarei, Batool Akhlaghinia
Turkish Journal of Chemistry
Herein we synthesized Cu(II) immobilized on Fe$_{3}$O$_{4}$ @Agarose functionalized with ethanolamine phosphate{ salicylaldehyde Schiff base (Fe$_{3}$O$_{4}$ @Agarose/SAEPH$_{2}$ /Cu(II)) as a new and cost-effective nanomagnetic catalyst. The nanomagnetic catalyst was characterized by FT-IR, XRD, VSM, SEM-EDX, TEM, TGA, and ICP techniques and it was found that the particles were about 9-25 nm in size and spherical with entrapment of the Fe$_{3}$O$_{4}$ particles in the hollow pore structure of the agarose. The prepared nanomagnetic catalyst showed excellent activity for preparation of 2-substituted imidazolines, oxazolines, and thiazolines. The catalyst is easy to prepare and exhibits higher catalytic activity than some commercially available copper …
Tetrahydronaphthalene As A Precursor Of New Series Of Chalcones, Flavanones, And Flavones, Ahmed Meddeb, Ghalia Bouhalleb, Julien Legros, Farhat Rezgui
Tetrahydronaphthalene As A Precursor Of New Series Of Chalcones, Flavanones, And Flavones, Ahmed Meddeb, Ghalia Bouhalleb, Julien Legros, Farhat Rezgui
Turkish Journal of Chemistry
An efficient synthetic route for a novel series of chalcones 2a-2d as well as for the corresponding flavanones 3a-3d and flavones 4a-4d, using functionalized tetrahydronaphthalene (THN), is described herein. The Claisen-Schmidt condensation of such THN and aromatic aldehydes, in the presence of an aqueous solution of KOH (40%), selectively gives the expected chalcones 2a-2d, which may further undergo an intramolecular oxa-Michael addition using piperidine, affording the corresponding flavanones 3a-3d in high yields. Alternatively, treatment of such chalcones 2a-2d with I$_{2}$/DMSO provides rapidly, in a one-pot oxidative cyclization, a series of flavones 4a-4d in excellent yields ranging from 85% to 90%.
Spectroscopic And Thermodynamic Approach To The Interaction Of Nonperipherally Substituted Cationic Phthalocyanines With Calf Thymus (Ct)-Dna, Sevgi̇can Tuncer, İbrahi̇m Özçeşmeci̇, Behi̇ce Şebnem Sesalan, Ayfer Kalkan Burat
Spectroscopic And Thermodynamic Approach To The Interaction Of Nonperipherally Substituted Cationic Phthalocyanines With Calf Thymus (Ct)-Dna, Sevgi̇can Tuncer, İbrahi̇m Özçeşmeci̇, Behi̇ce Şebnem Sesalan, Ayfer Kalkan Burat
Turkish Journal of Chemistry
Novel, nonperipherally tetrasubstituted cationic metal-free and metallophthalocyanines (Zn, In) were synthesized in the present study. The binding constants, the disappearance of quenching effect of all cationic phthalocyanines on the fluorescence intensity of SYBR Green--disodium salt of deoxyribonucleic acid (DNA) from calf thymus complex, and the changes in T$_{m}$ of double helix DNA with thermal denaturation profile were investigated by UV-Vis and fluorescence spectrophotometric methods. To investigate the spontaneity of the reactions between DNA and novel quaternized phthalocyanines in buffer, thermodynamic parameters were employed.
Peg-Peptide Conjugate Containing Cathepsin B Degradation Unit As A Doxorubicin Carrier System, Nesli̇gül Şentürk, Ayben Top
Peg-Peptide Conjugate Containing Cathepsin B Degradation Unit As A Doxorubicin Carrier System, Nesli̇gül Şentürk, Ayben Top
Turkish Journal of Chemistry
A drug delivery system (DDS) containing a cathepsin B degradable sequence and pH-responsive histidines was prepared by methoxypolyethylene glycol and peptide conjugation. Doxorubicin was attached to the carrier system using amide linkage to give the final form of the DDS, denoted as mPEG-AT3-DOX. mPEG-AT3-DOX exhibited a bimodal size distribution at about 15 and 30 nm independent of pH, whereas the size of the control DDS containing no peptide sequence, mPEG-DOX, was measured as $\sim$ 15-20 nm. At the end of 72 h, % doxorubicin release from both of the DDSs was observed to be below 8.5 $\pm$ 3% in the …
Synthesis And Biological Evaluation Of Novel Chalcones Bearing Morpholine Moiety As Antiproliferative Agents, Bedri̇ye Seda Kurşun Aktar, Emi̇ne Elçi̇n Oruç-Emre, İbrahi̇m Demi̇rtaş, Ayşe Şahi̇n Yağlioğlu, Ayşegül Karaküçük İyi̇doğan, Çağlar Güler, Şevki̇ Adem
Synthesis And Biological Evaluation Of Novel Chalcones Bearing Morpholine Moiety As Antiproliferative Agents, Bedri̇ye Seda Kurşun Aktar, Emi̇ne Elçi̇n Oruç-Emre, İbrahi̇m Demi̇rtaş, Ayşe Şahi̇n Yağlioğlu, Ayşegül Karaküçük İyi̇doğan, Çağlar Güler, Şevki̇ Adem
Turkish Journal of Chemistry
In this research, a new series of ($E)$-3-(4-substitutedphenyl)-1-(4'-morpholinophenyl)prop-2-en-1-one derivatives 1-7 was synthesized, aiming to develop effective antiproliferative agents. The antiproliferative activities of compounds 1-7 were examined against HeLa and C6 cell lines at eight different concentrations using the BrdU ELISA assay. The activity results were compared with reference anticancer drug 5-fluorouracil (5-FU). Compound 1 had almost the same antiproliferative activity as 5-FU. Compounds 1-7 were found to have greater effects against the C6 cell line than the HeLa cell line. These compounds were also tested in order to determine their effects on enzyme activities. Compounds 2 and 3 exhibited strong …
A Novel Hypobromous Acid Scavenging Activity Assay Using $P$-Cresol As A Spectrofluorometric Probe, Burcu Bekdeşer, Gülüzar Zeytünlü, Mustafa Özyürek, Mustafa Reşat Apak
A Novel Hypobromous Acid Scavenging Activity Assay Using $P$-Cresol As A Spectrofluorometric Probe, Burcu Bekdeşer, Gülüzar Zeytünlü, Mustafa Özyürek, Mustafa Reşat Apak
Turkish Journal of Chemistry
In this study, a novel spectrofluorometric assay based on $p$-cresol (4-methyl phenol) probe is developed for the measurement of HOBr scavenging activity. It is the first study involving the use of a $p$-cresol probe for the determination of the HOBr scavenging activity of biothiols. While the $p$-cresol probe ($\lambda_{ex}$ = 260 nm, $\lambda_{em}$ = 305 nm) has fluorescence characteristics, its brominated derivatives emerging at the end of the oxidation reaction with HOBr do not show fluorescence. The initial fluorescence intensity of the $p$-cresol probe is decreased in the presence of the brominating agent, HOBr, and this decrease is lower in …
Application Of The Taguchi Approach To Optimize Zno Synthesis Via Hydrothermally Assisted Sol-Gel Method, Zahra Khaghanpour, Sanaz Naghibi
Application Of The Taguchi Approach To Optimize Zno Synthesis Via Hydrothermally Assisted Sol-Gel Method, Zahra Khaghanpour, Sanaz Naghibi
Turkish Journal of Chemistry
ZnO powder was synthesized via a hydrothermally assisted sol-gel method. Synthesis variables including Zn-precursor type, pH value, time, and temperature of hydrothermal treatment were analyzed using the Taguchi approach. The experimental procedures were defined based on the L9 array for four variables in three levels. The influences of those variables on the response parameters, i.e. crystallite size, crystallinity, band gap energy ($E_{g})$, and degradation constants ($k)$, were evaluated. XRD results and $E_{g}$ values showed that ZnO wurtzite appeared to be the only crystalline phase in the samples. Taguchi analysis predicted that the optimized conditions to achieve the highest photoactivity are …
Highly Efficient Catalytic Degradation Of Low-Density Polyethyleneusing A Novel Tungstophosphoric Acid/Kaolin Clay Composite Catalyst, Saira Attique, Madeeha Batool, Muhammad Irfan Jalees, Khurram Shehzad, Umar Farooq, Zakir Khan, Fawad Ashraf, Asma Tufail Shah
Highly Efficient Catalytic Degradation Of Low-Density Polyethyleneusing A Novel Tungstophosphoric Acid/Kaolin Clay Composite Catalyst, Saira Attique, Madeeha Batool, Muhammad Irfan Jalees, Khurram Shehzad, Umar Farooq, Zakir Khan, Fawad Ashraf, Asma Tufail Shah
Turkish Journal of Chemistry
In order to take advantage of the Bronsted acidity of tungstophosphoric acid (TPA) and Lewis acidity of kaolin, TPA-loaded kaolin catalysts with varying percentages of TPA (10-50 wt.-%) were prepared by wet impregnation method. Fourier transform infrared spectrometer, X-ray diffractometer, Brunauer-Emmett-Teller surface area analyzer, and scanning electron microscope characterizations were performed to confirm the successful loading of TPA on kaolin. Catalytic cracking of low-density polyethylene (LDPE), by employing TPA-loaded kaolin as the catalyst, produced a higher percentage of fuel oil (liquid and gaseous hydrocarbons) with a negligible amount of semisolid wax (1.0 wt.-%). The wax amount was significantly lower compared …
$S$-Substituted Derivatives Of 1,2,4-Triazol-3-Thiol As New Drug Candidates For Type Ii Diabetes, Aziz Ur Rehman, Khadija Nafeesa, Muhammad Athar Abbasi, Sabahat Zahra Saddiqui, Shahid Rasool, Syed Adnan Ali Shah, Muhammad Ashraf, Muhammad Arif Lodhi, Farman Ali Khan, Bakht Jahan
$S$-Substituted Derivatives Of 1,2,4-Triazol-3-Thiol As New Drug Candidates For Type Ii Diabetes, Aziz Ur Rehman, Khadija Nafeesa, Muhammad Athar Abbasi, Sabahat Zahra Saddiqui, Shahid Rasool, Syed Adnan Ali Shah, Muhammad Ashraf, Muhammad Arif Lodhi, Farman Ali Khan, Bakht Jahan
Turkish Journal of Chemistry
The therapeutic applications of 1,2,4-triazoles motivated us to synthesize some new derivatives. Two series of $S$-substituted derivatives (8a-8j, 12a-12i) of 5-$\{$1-[(4-chlorophenyl)sulfonyl]-3-piperidinyl$\}$-4-phenyl-4$H$-1,2,4-triazol-3-thiol (6) have been synthesized and evaluated for their biological potential. Using 4-chlorobenzene sulfonyl chloride (1) and ethyl piperidine-3-carboxylate (2), ethyl 1-[(4-chlorophenyl)sulfonyl]piperidine-3-carboxylate (3) was synthesized and converted into 3,4,5-trisubstituted 1,2,4-triazole (6) through formation of the corresponding carbohydrazide (4) and hydrazinecarbothioamide (5). Compound 6 was transformed into 8a-8j by alkyl halides (7a-7j) and into 12a-12i by $N$-aralkyl/aryl-2-bromoacetamides (11a-11i) in an aprotic solvent. The electrophiles, 11a-11i, were synthesized by gearing up $N$-substituted aralkyl/aryl amines (10a-10i) with 2-bromoacetyl bromide (9) under dynamic pH …
Ligand Binding Constants Of The Cucurbit[7]Uril Predicted With Molecular Docking: A Theoretical Study, Balázs Roósz, Tamás Körtvélyesi, Béla Viskolcz
Ligand Binding Constants Of The Cucurbit[7]Uril Predicted With Molecular Docking: A Theoretical Study, Balázs Roósz, Tamás Körtvélyesi, Béla Viskolcz
Turkish Journal of Chemistry
A binding stability order predicting, molecular docking based fast technique was developed for host--guest complexes. Molecular descriptors were applied to ligand molecules to make the binding energy based docking scoring functions more efficient and reach the $\pm $0.50 log K unit theoretical precision for predictions. The goal of this work was to model complexes of cucurbit[7]uril (CB7) as a host molecule with different local anesthetics and choline and phosphonium choline molecules. The guest molecules were docked into the cavity of CB7. The binding free energy maps were correlated by Contact, Grid-Based, Hawkins GB/SA, and AMBER docking scores obtained from UCSF …
Efficient Reductive Claisen Rearrangement Of Prop-2'-Enyloxyanthraquinones And 2'-Chloroprop-2'-Enyloxyanthraquinones With Iron Powder In Ionic Liquids, Samaneh Nadali, Ali Khoshroo, Ghasem Aghapour
Efficient Reductive Claisen Rearrangement Of Prop-2'-Enyloxyanthraquinones And 2'-Chloroprop-2'-Enyloxyanthraquinones With Iron Powder In Ionic Liquids, Samaneh Nadali, Ali Khoshroo, Ghasem Aghapour
Turkish Journal of Chemistry
A rapid and selective iron-mediated reductive Claisen rearrangement of various prop-2'-enyloxyanthraquinones and 2'-chloroprop-2'-enyloxyanthraquinones to 1-hydroxy-2-(prop-2'-enyl)anthraquinones and anthrafurandiones is presented. All reactions are carried out in a mixture of ionic liquids, [Bzmim]Cl (1-benzyl-3-methylimidazolium chloride) and [Hmim]BF$_{4}$ (1-methylimidazolium tetrafluoroborate), in short reaction times (5-35 min). Our study showed that 1-(prop-2'-enyloxy)anthraquinone is more active than 1-(2'-chloroprop-2'-enyloxy)anthraquinone to perform this rearrangement.
One-Pot Multicomponent Synthesis Of Piperidinium 3,3'-(Arylmethylene) Bis (2-Hydroxynaphthalene-1,4-Diones): Nmr Spectroscopic And X-Ray~Structure Characterization, Maryam Fatahpour, Nourollah Hazeri, Malek Taher Maghsoodlou, Fatemeh Noori Sadeh, Mojtaba Lshkari
One-Pot Multicomponent Synthesis Of Piperidinium 3,3'-(Arylmethylene) Bis (2-Hydroxynaphthalene-1,4-Diones): Nmr Spectroscopic And X-Ray~Structure Characterization, Maryam Fatahpour, Nourollah Hazeri, Malek Taher Maghsoodlou, Fatemeh Noori Sadeh, Mojtaba Lshkari
Turkish Journal of Chemistry
A facile synthesis of piperidinium 3,3'-(arylmethylene) bis (2-hydroxynaphthalene-1,4-dione) analogs as organic salts is described by the one-pot pseudo-four-component reaction between 2-hydroxy-1,4-naphthoquinone, aromatic aldehydes, and piperidine. The single-crystal X-ray diffraction analysis of these systems confirms that the stabilized predominant interactions are N-H\... O and O-H\... O hydrogen bonds. Mild and clean reaction conditions, high atom economy, and operational simplicity of this one-pot multicomponent reaction coupled with excellent yields and no need for column chromatography have transformed this procedure to be a superior synthetic route for the efficient formation of families of naphthoquinone-derived compounds.
Physicochemical Characterization Of Different Cellulose Polymorphs/Graphene Oxide Composites And Their Antibacterial Activity, Sherif Mohamed Abdel Salam Keshk, Ibrahim Sayed Yahia
Physicochemical Characterization Of Different Cellulose Polymorphs/Graphene Oxide Composites And Their Antibacterial Activity, Sherif Mohamed Abdel Salam Keshk, Ibrahim Sayed Yahia
Turkish Journal of Chemistry
In order to investigate the interaction of graphene oxide (GO) with different cellulose polymorphs (I and II), we synthesized cellulose (I and II)/GO composites using the sonication method. Interestingly, no new peaks were observed in the FT-IR pattern of the cellulose (I and II)/GO composites, indicating that no chemical reactions took place between GO and cellulose. The X-ray diffraction patterns of cellulose I and II/GO composites were slightly different than those observed for cellulose I and II, indicating that some physical interactions occurred between the GO and cellulose. Unexpectedly the $d$-spacing values and the diffraction plane at the high-angle side …
Environmental Impact Assessment Of Natural Radioactivity And Heavy Metals In Drinking Water Around Akkuyu Nuclear Power Plant In Mersin Province, Gürsel Karahan, Hali̇m Taşkin, Nesli̇ Bi̇ngöldağ, Eni̇s Kapdan, Yusuf Zi̇ya Yilmaz
Environmental Impact Assessment Of Natural Radioactivity And Heavy Metals In Drinking Water Around Akkuyu Nuclear Power Plant In Mersin Province, Gürsel Karahan, Hali̇m Taşkin, Nesli̇ Bi̇ngöldağ, Eni̇s Kapdan, Yusuf Zi̇ya Yilmaz
Turkish Journal of Chemistry
The aim of this study was to determine natural radioactive and heavy element concentrations in Mersin drinking water samples before the commissioning of the Akkuyu nuclear power plant and to collect data for possible environmental contaminations in the future. Drinking water samples were taken from the provincial center, districts, and populated villages. The annual effective dose of natural radionuclides and cancer risks were calculated for each person living in the city. Hazard index and cancer risk were calculated, which were caused by heavy elements. Mean gross alpha and beta radioactivity concentrations in drinking water were 0.059 Bq/L and 0.120 Bq/L, …
Simultaneous Determination Of Copper(Ii) And Zinc(Ii) Via Simple Acid-Base Titrimetry Using Glass Ph Electrode, Emi̇ne Gül Cansu Ergün, Adnan Kenar
Simultaneous Determination Of Copper(Ii) And Zinc(Ii) Via Simple Acid-Base Titrimetry Using Glass Ph Electrode, Emi̇ne Gül Cansu Ergün, Adnan Kenar
Turkish Journal of Chemistry
The combination of potentiometric methods with multivariate calibration techniques allows complex mixtures to be analyzed. In this study, a new method was developed and reported for simultaneous determination of copper(II) and zinc(II) cations in a mixture by titrimetric methods. The developed method permits simultaneous cation analysis with low detection limits, just by using a pH electrode. This work has achieved the challenging goal of developing a cost-effective and applicable method that can be applied in most laboratories due to independence of any chemical instruments. Partial least squares 1, one of the multivariate calibration techniques, was used in the analysis of …