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Articles 901 - 930 of 2628
Full-Text Articles in Physical Sciences and Mathematics
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 …
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 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 $M) on nine different panels of 59 cancer cell lines. 2-$\{$5-[(2,4-Dichlorophenoxy)methyl]-1,3,4-oxadiazol-2-yl$\}$phenol (5e) showed the maximum cytotoxicity among the series of ten compounds. The cytotoxicity of 5e was comparable to that of the standard anticancer drug, 5-fluorouracil, and better than that of imatinib. The structure activity relationship was also discussed.
Synthesis And Antimicrobial And Antioxidant Activities Of Hybrid Molecules Containing Benzotriazole And 1,2,4-Triazole, Mahesh Chand, Reena Kaushik, Subhash Chand Jain
Synthesis And Antimicrobial And Antioxidant Activities Of Hybrid Molecules Containing Benzotriazole And 1,2,4-Triazole, Mahesh Chand, Reena Kaushik, Subhash Chand Jain
Turkish Journal of Chemistry
Eleven novel 1,2,4-triazolylbenzotriazoles have been prepared using 1-(hydrazinylcarbonylmethyl)-1$H$-benzot- riazole (3) as a potent intermediate. Compound 3, however, was obtained from benzotriazole in two steps. All synthesized compounds were characterized by detailed spectral studies like IR, $^{1}$H NMR, $^{13}$C NMR, and mass spectrometry. All synthesized compounds were evaluated for their \textit{in vitro} antimicrobial activity against seven strains of bacteria and four strains of fungi. Compounds 13, 17, 19, 20, and 21}were found to possess antibacterial activity comparable to that of ciprofloxacin against a Klebsiella pneumoniae strain. Except for compounds2 and 13, all compounds showed good antifungal activity against an Aspergillus niger …
Preparation Of Self-Propelled Cu-Pt Micromotors And Their Application In Mirna Monitoring, Lütfi̇ Öksüz, Gözde Yurdabak Karaca, Fi̇li̇z Kuralay, Emre Uygun, İsmi̇han Ümran Koç, Ayşegül Uygun Öksüz
Preparation Of Self-Propelled Cu-Pt Micromotors And Their Application In Mirna Monitoring, Lütfi̇ Öksüz, Gözde Yurdabak Karaca, Fi̇li̇z Kuralay, Emre Uygun, İsmi̇han Ümran Koç, Ayşegül Uygun Öksüz
Turkish Journal of Chemistry
Self-propelled catalytic micromotors offer considerable promise in terms of many applications. Catalytic micromotors are strongly influenced by the presence and concentration of specific ions and chemicals in the environment, making them useful as sensors and actuators. In this work, copper (Cu)-platinum (Pt) micromotors were fabricated by using the magnetron sputtering method for the first time in the literature and their applications based on the detection of miRNA-21 were evaluated. We analyzed the dependence of the mobility of Cu-Pt micromotors using different concentrations of hydrogen peroxide (H$_{2}$O$_{2})$. The presence of surfactants in the environment is also important for the movement of …
Determination Of Hydrogen Peroxide With An Enzymeless Amperometric Sensor Based On Poly(Vinylferrocene)-Supported Ag Nanoparticles, Mutlu Sönmez Çelebi̇, Kübra Öztürk, Mehmet Dumangöz, Fi̇li̇z Kuralay
Determination Of Hydrogen Peroxide With An Enzymeless Amperometric Sensor Based On Poly(Vinylferrocene)-Supported Ag Nanoparticles, Mutlu Sönmez Çelebi̇, Kübra Öztürk, Mehmet Dumangöz, Fi̇li̇z Kuralay
Turkish Journal of Chemistry
An enzymeless electrochemical sensor for detection of low amounts of H$_{2}$O$_{2}$ with the aid of Ag nanoparticles supported on conducting poly(vinylferrocene) (PVF) film was developed. Experimental results revealed that contribution of Ag nanoparticles led to remarkable improvement by means of reduction potential and reduction current. Influence of experimental parameters (i.e. polymeric film thickness, concentration of Ag precursor, immersion time in precursor solution, reduction time, and reduction potential) were investigated. The Ag/PVF-modified electrode system was characterized physically by scanning electron microscopy. The results revealed that the sensor developed was easy-to-prepare, economic, selective, and sensitive, with a fast response time of 3 …
Electrochemical Detection Of Dna Interaction With Mannich Base Derivatives By Disposable Graphite Electrodes, Hüseyi̇n İstanbullu, Hakan Karadeni̇z, Erçi̇n Erci̇yas, Kadri̇ye Arzum Erdem Gürsan
Electrochemical Detection Of Dna Interaction With Mannich Base Derivatives By Disposable Graphite Electrodes, Hüseyi̇n İstanbullu, Hakan Karadeni̇z, Erçi̇n Erci̇yas, Kadri̇ye Arzum Erdem Gürsan
Turkish Journal of Chemistry
Four different Mannich base derivatives containing an aromatic/heteroaromatic propanone structure (C1 (3-(dimethylamino)-1-(thiophen-2-yl)propan-1-one hydrochloride); C2 (3-morpholino-1-(pyridin-3-yl)propan-1-one hydrochloride); C3 (3-(dimethylamino)-1-(1H-indol-3-yl)propan-1-one hydrochloride), C4 (3-(piperidin-1-yl)-1-(pyren-1-yl)propan-1-one hydrochloride)) were earlier synthesized and characterized with $^{1}$H NMR, $^{13}$C NMR, MS, and elemental analysis. The interaction of these compounds with fish sperm double stranded DNA (fs-dsDNA) was investigated by using differential pulse voltammetry (DPV) in connection with a disposable pencil graphite electrode (PGE). After the interaction procedure, there was a meaningful decrease in the oxidation signal of the electroactive DNA base guanine due to possible intercalation and/or alkylation mechanism between these Mannich base derivatives and DNA. The features …
The Multiple Effects Of Organoclay And Solvent Evaporation On Hydrophobicity Of Composite Surfaces, Haci Hasan Yolcu, Ahmet Gürses, Rabah Boukherroub
The Multiple Effects Of Organoclay And Solvent Evaporation On Hydrophobicity Of Composite Surfaces, Haci Hasan Yolcu, Ahmet Gürses, Rabah Boukherroub
Turkish Journal of Chemistry
A superhydrophobic high-density polyethylene (HDPE)/organoclay composite material with a water-static contact angle of $\sim $162$^{\circ}$ and low hysteresis (7$^{\circ})$ was prepared by a simple solution-intercalation technique. This one-step method consists of the insertion of organoclay, produced through cation exchange with cetyltrimethylammonium bromide (CTAB), in the polymer matrix at 120 $^{\circ}$C in xylene. In this process, evaporation of the solvent and organoclay amount are key factors for the achievement of superhydrophobicity. We characterized composite material with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and contact angle measurements. The characterizations showed that the organoclay provides a place for …
Microwave-Enhanced Fenton-Like Degradation By Surface-Modified Metal-Organic Frameworks As A Promising Method For Removal Of Dye From Aqueous Samples, Seyed Ershad Moradi, Shayessteh Dadfarnia, Ali Mohammad Haji Shabani, Saeed Emami
Microwave-Enhanced Fenton-Like Degradation By Surface-Modified Metal-Organic Frameworks As A Promising Method For Removal Of Dye From Aqueous Samples, Seyed Ershad Moradi, Shayessteh Dadfarnia, Ali Mohammad Haji Shabani, Saeed Emami
Turkish Journal of Chemistry
In the current research, the sulfonated metal-organic framework loaded on iron oxide nanoparticles, Fe$_{3}$O$_{4}$@MIL-100(Fe)-OSO$_{3}$H, has been synthesized and utilized as a Fenton-like catalyst for the decolorization of aqueous solutions containing methyl orange (MO) dye as a model organic pollutant. The morphology and structure of the catalyst were characterized by X-ray powder diffraction, transmission electron microscopy, Brunauer-Emmett-Teller analysis, thermogravimetric analysis, Fourier transform infrared spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The effects of various parameters on MO degradation were investigated and the optimum conditions for MO degradation were found to be an initial concentration of MO of 100 mg/L, initial concentration of …
Investigation Of The Effects Of Purification And Characterization Of Turkey (Meleagris Gallopavo) Liver Mitochondrial Thioredoxin Reductase Enzyme And Some Metal Ions On Enzyme Activity, Yusuf Temel, Ö. İrfan Küfrevi̇oğlu, Mehmet Çi̇ftci̇
Investigation Of The Effects Of Purification And Characterization Of Turkey (Meleagris Gallopavo) Liver Mitochondrial Thioredoxin Reductase Enzyme And Some Metal Ions On Enzyme Activity, Yusuf Temel, Ö. İrfan Küfrevi̇oğlu, Mehmet Çi̇ftci̇
Turkish Journal of Chemistry
The thioredoxin system, found in all living creatures, consists of thioredoxin protein (Trx), thioredoxin reductase enzyme (TrxR), and NADPH. In this study, turkey liver mitochondrial TrxR enzyme with 3.07 EU $\times $ mg$^{-1}$ specific activity was purified 990-fold in a yield of 2.05{\%} using 2',5'-ADP Sepharose 4B affinity chromatography. The purity of the enzyme was measured and the molecular weight of its subunits was determined to be 45.5 kDa by SDS-PAGE. The molecular mass of the enzyme's natural state was found to be 88 kDa using Sephadex-G 150 gel filtration chromatography. In addition, characteristic and kinetic properties of the enzyme …
Cyclic Voltammetry Behavior Of Tamoxifen In Different Electrolytes, Electrochemical Characterization, And Its Measurement By Differential Pulse Anodic Voltammetry, Zeinab Deris Falahieh, Mehdi Jalali, Mohammad Alimoradi
Cyclic Voltammetry Behavior Of Tamoxifen In Different Electrolytes, Electrochemical Characterization, And Its Measurement By Differential Pulse Anodic Voltammetry, Zeinab Deris Falahieh, Mehdi Jalali, Mohammad Alimoradi
Turkish Journal of Chemistry
Cyclic voltammetry (CV) was performed on tamoxifen (tam) using different electrodes and in various acidic electrolytes containing 10% v v$^{-1}$ methanol (MeOH). Tam oxidation was found to be most favorable using 0.1 mol L$^{-1}$ H$_{2}$SO$_{4}$. To investigate the mechanism, we performed chronoamperometry, CV at different scan rates, differential pulse anodic voltammetry (DPAV), and electrochemical impedance spectroscopy on tam-covered glassy carbon electrodes (GCEs). The electrode area, diffusion coefficient, and surface concentration ($\Gamma )$ of tam were calculated to be 0.062 cm$^{2}$, 3.65 $\times $ 10$^{-6}$ cm$^{2}$ s$^{-1}$, and 3.2 $\times $ 10$^{-10}$ mol cm$^{-2}$ respectively. Then the effects of different parameters …
Sonochemical Degradation Of Basic Red 29 In Aqueous Media, Zineb Boutamine, Slimane Merouani, Oualid Hamdaoui
Sonochemical Degradation Of Basic Red 29 In Aqueous Media, Zineb Boutamine, Slimane Merouani, Oualid Hamdaoui
Turkish Journal of Chemistry
In this work, the degradation of Basic Red 29 (BR29), an azo dye, was investigated using a high-frequency ultrasonic reactor (300 kHz). The influence of several parameters such as initial substrate concentration (5--200 mg L$^{-1})$, pH (3-10.1), ultrasonic power (20-80 W), and nature of the dissolved gas (Ar, air, and N$_{2})$ on the degradation of BR29 was assessed. Additionally, the impact of natural matrices (seawater and natural and river waters) on the degradation rate of BR29 was clarified. Degradation experiments with radical scavengers, tert-butyl alcohol and glucose, showed that BR29 degraded mainly through HO$^{\bullet }$ radical attack at the gas/liquid …
Synthesis And Anticancer And Cytotoxic Effects Of Novel 1,4-Phenylene-Bis-N-Thiocarbamoylpyrazole And 1,4-Phenylene-Bis-Pyrazolylthiazole Derivatives, Meli̇ha Burcu Gürdere, Erdoğan Kamo, Yakup Budak, Ayşe Şahi̇n Yağlioğlu, Mustafa Ceylan
Synthesis And Anticancer And Cytotoxic Effects Of Novel 1,4-Phenylene-Bis-N-Thiocarbamoylpyrazole And 1,4-Phenylene-Bis-Pyrazolylthiazole Derivatives, Meli̇ha Burcu Gürdere, Erdoğan Kamo, Yakup Budak, Ayşe Şahi̇n Yağlioğlu, Mustafa Ceylan
Turkish Journal of Chemistry
Thiazolylpyrazoline derivatives were recently reported as potent anticancer agents. In this study, novel 1,4-phenylene-bis-N-thiocarbamoylpyrazoles (3a-h and 1,4-phenylene-bis-pyrazolylthiazoles (5a-h were prepared and screened for their anticancer activities against C6 (rat brain tumor cells) and HeLa (human uterus carcinoma). Anticancer activity studies were performed as a dose-dependent assay starting with eight concentrations. 5-Fluorouracil (5-FU) was used as a positive control. Compounds 3c, 3d, and 3h were examined and they revealed almost the same activities compared with 5-FU in terms of cell selectivity against C6 cells. Moreover, compounds 3a-h had lower cytotoxicity than 5-FU. The low cytotoxicity values of 3a-h as well as …
Syntheses And Photoluminescence Properties Of New Zn(Ii) And Cd(Ii) Coordination Polymers Prepared From 5-Sulfoisophthalate Ligand, Fati̇h Semerci̇
Syntheses And Photoluminescence Properties Of New Zn(Ii) And Cd(Ii) Coordination Polymers Prepared From 5-Sulfoisophthalate Ligand, Fati̇h Semerci̇
Turkish Journal of Chemistry
New coordination polymers, formulated as {[Zn($\mu $-sipH)($\mu $-apim)]$\cdot $3H$_{2}$O} $_{n}$ (1) and {[Cd($\mu $-sip)(H$_{2}$O)$_{2}$ (apimH)]$\cdot $3H$_{2}$O}$_{n}$ (2) were synthesized based on the 1-(3-aminopropyl)imidazole (apim) along with 5-sulfoisophthalate (sip) ligands. The complexes were synthesized under mild hydrothermal conditions. All the complexes were characterized by elemental analysis, FT-IR spectroscopy, and single-crystal X-ray diffraction studies. The X-ray crystallographic studies of 1 and 2 reveal Zn(II) and Cd(II) ions are $\mu $-bridged by dianionic sipH and trianionic sip ligands in bis(monodentate) and bis(bidentate) coordination mode, respectively, to generate 1D polymer chains. In complex 1, the adjacent chains are linked by two apim ligands to …
Synthesis And In Vitro Anticancer Evaluation Of 1,4-Phenylene-Bis-Pyrimidine-2-Amine Derivatives, Meli̇ha Burcu Gürdere, Erdoğan Kamo, Ayşe Şahi̇n Yağlioğlu, Yakup Budak, Mustafa Ceylan
Synthesis And In Vitro Anticancer Evaluation Of 1,4-Phenylene-Bis-Pyrimidine-2-Amine Derivatives, Meli̇ha Burcu Gürdere, Erdoğan Kamo, Ayşe Şahi̇n Yağlioğlu, Yakup Budak, Mustafa Ceylan
Turkish Journal of Chemistry
A series of 1,4-phenylene-bis-chalcones 3a-3h were synthesized by the reaction of terephthalaldehyde with substituted arylketones in this study. The novel 1,4-phenylene-bis-pyrimidine-2-amine derivatives 5a-5h were obtained by the addition of guanidine hydrochloride to 1,4-phenylene-bis-chalcone 3a-3h in ethanolic KOH under reflux conditions. The structure of the compounds was explained by means of IR, $^{1}$H NMR, $^{13}$C NMR, and elemental analyses. The anticancer activities of 3a-3h and 5a-5h were investigated against rat brain tumor cells and human uterus carcinoma in vitro$.$ Activity tests were performed as dose-dependent assays at eight concentrations. The positive control was 5-fluorouracil (5-FU). Compounds 3c and 3d were examined …
Stereoselective And Regioselective Synthesis Of $N$-Substituted Methyl 2-((Azolyl)Methyl)-3-Arylacrylates From Baylis-Hillman Acetates, Ayşen Köseceli̇ Özenç, İlhami̇ Çeli̇k, Şule Kökten
Stereoselective And Regioselective Synthesis Of $N$-Substituted Methyl 2-((Azolyl)Methyl)-3-Arylacrylates From Baylis-Hillman Acetates, Ayşen Köseceli̇ Özenç, İlhami̇ Çeli̇k, Şule Kökten
Turkish Journal of Chemistry
$N$-Substituted methyl 2-((azolyl)methyl)-3-arylacrylates were synthesized stereo- and regioselectively with one-pot reaction between Baylis--Hillman acetates and a suitable acylazole in the presence of K$_{2}$CO$_{3}$ as a base catalyst. The targeted $N$-substituted azole acrylates were efficiently obtained in good yields (39%-89%).
Synthesis Of Novel Derivatives Of Chromenone Bearing An $N$-Carbamothioyl Moiety As Soybean 15-Lox Inhibitors, Robabeh Kaviani, Mina Saeedi, Mohammad Mahdavi, Hamind Nadri, Alireza Moradi, Abbas Shafiee, Tahmineh Akbarzadeh
Synthesis Of Novel Derivatives Of Chromenone Bearing An $N$-Carbamothioyl Moiety As Soybean 15-Lox Inhibitors, Robabeh Kaviani, Mina Saeedi, Mohammad Mahdavi, Hamind Nadri, Alireza Moradi, Abbas Shafiee, Tahmineh Akbarzadeh
Turkish Journal of Chemistry
Novel derivatives of chromenone bearing an $N$-carbamothioyl moiety were synthesized and evaluated for their soybean 15-LOX inhibitory activity. Synthesis of the target compounds was started from 7-hydroxy-2$H$-chromen-2-one. It was reacted with 1-fluoro-2(4)-nitrobenzene to obtain the corresponding nitrophenoxy-chromenone derivative. Reduction of the nitro group was achieved in the presence of Zn/NH$_{4}$Cl and reaction of the latter compound with in situ prepared benzoyl isothiocyanate led to the formation of the title compounds. All compounds were characterized and tested against soybean 15-LOX. Among them, 4-methyl-$N$-((4-((2-oxo-2$H$-chromen-7-yl)oxy)phenyl)carbamothioyl)benzamide (7l) showed the best activity as potent as the reference drug, quercetin.
Development Of A Sample Preparation Strategy For The Determination Of Tungsten In Soil Samples By Inductively Coupled Plasma Mass Spectrometry Using A Response Surface Methodology, Ümran Seven Erdemi̇r
Development Of A Sample Preparation Strategy For The Determination Of Tungsten In Soil Samples By Inductively Coupled Plasma Mass Spectrometry Using A Response Surface Methodology, Ümran Seven Erdemi̇r
Turkish Journal of Chemistry
An alternative rapid digestion method has been developed for the determination of tungsten (W) in soil samples using fractionation studies and response surface methodology. The digestion method using the Kjeldahl instrument was applied to samples, and soluble tungsten was determined via inductively coupled plasma mass spectrometry. Digestion parameters were selected depending on the results of fractionation studies and optimized using a four-factor and five-level central composite design. The contributions of the phosphoric acid concentration (X$_{1})$, digestion temperature (X$_{2})$, digestion time (X$_{3})$, and hydrochloric acid concentration (X$_{4})$ were evaluated for the determination of W from samples in which its levels were …
Dehydration Behavior And Kinetics Of Kurnakovite Under Microwave Irradiation, Fatma Tuğçe Şenberber, Meral Yildirim, İkli̇m Nergi̇z Özdoğan, Azmi̇ Seyhun Kipçak, Emek Derun
Dehydration Behavior And Kinetics Of Kurnakovite Under Microwave Irradiation, Fatma Tuğçe Şenberber, Meral Yildirim, İkli̇m Nergi̇z Özdoğan, Azmi̇ Seyhun Kipçak, Emek Derun
Turkish Journal of Chemistry
In this research, the dehydration behavior of kurnakovite was studied under microwave irradiation. The kinetic parameters of the dehydration reaction were determined using different kinetic models. Kurnakovite was characterized by the techniques of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) before and after the dehydration process. According to the results, kurnakovite was identified as a compound with the powder diffraction file (pdf) number 00-024-0700 before the dehydration process and after the dehydration process amorphous formations were observed. Moreover, FT-IR results showed that dehydration was completed successfully because of the disappearance in the band values …
Adsorption Isotherm Modeling Of Carbendazim And Flumetsulam Onto Homoionic-Montmorillonite Clays: Comparison Of Linear And Nonlinear Models, Yassine El Maataoui̇, Mohamadine El M'Rabet, Abdelkrim Maaroufi, Hassan Oudda, Abdelmalek Dahchour
Adsorption Isotherm Modeling Of Carbendazim And Flumetsulam Onto Homoionic-Montmorillonite Clays: Comparison Of Linear And Nonlinear Models, Yassine El Maataoui̇, Mohamadine El M'Rabet, Abdelkrim Maaroufi, Hassan Oudda, Abdelmalek Dahchour
Turkish Journal of Chemistry
This study deals with the adsorption of two pesticides, carbendazim and flumetsulam, from aqueous solutions onto four homoionic-montmorillonite clays (Ag$^{+}$, Zn$^{2+}$, Cu$^{2+}$, and H$^{+})$. Equilibrium adsorption isotherm data were analyzed using Freundlich, Dubinin-Radushkevich, and Temkin isotherms. Linear and nonlinear fitting methods were compared to determine the best-fitting isotherms for the experimental data. Three error analysis methods were used to evaluate the data for each method: the coefficient of determination (R$^{2})$, sum of squared errors (SSE), and chi-square test ($\chi^{2})$. Equilibrium adsorption isotherms exhibited that the carbendazim adsorption mainly involved cation exchange with homoionic-montmorillonite adsorbents. However, for flumetsulam, the main mechanisms …
The Reactions Of N$_{3}$P$_{3}$Cl$_{6}$ With Monodentate And Bidentate Ligands: The Syntheses And Structural Characterizations, In Vitro Antimicrobial Activities, And Dna Interactions Of 4-Fluorobenzyl(N/O)Spirocyclotriphosphazenes, Aytuğ Okumuş, Gamze Elmas, Zeynel Kiliç, Nagehan Ramazanoğlu, Leyla Açik, Mustafa Türk, Gülçi̇n Akca
The Reactions Of N$_{3}$P$_{3}$Cl$_{6}$ With Monodentate And Bidentate Ligands: The Syntheses And Structural Characterizations, In Vitro Antimicrobial Activities, And Dna Interactions Of 4-Fluorobenzyl(N/O)Spirocyclotriphosphazenes, Aytuğ Okumuş, Gamze Elmas, Zeynel Kiliç, Nagehan Ramazanoğlu, Leyla Açik, Mustafa Türk, Gülçi̇n Akca
Turkish Journal of Chemistry
The Cl replacement reactions of 4-fluorobenzyl(N/O)spirocyclotriphosphazene (2) with excess monoamines led to the formation of 4-fluorobenzylspiro(N/O)tetraaminocyclotriphosphazenes (2a-2d). The partly substituted \textbf{dispiro 3b and dispiro 3c and fully substituted trispirocyclotriphosphazenes (trans 4a, cis 4c, 4d, and 4e) were obtained, respectively, from the reactions of 2 with one equimolar and two equimolar amounts of diamines, aminoalcohol, and diols. Although efforts were made for the separation of the cis/trans and optical isomers of the dispiro phosphazenes, only one set of diastereomers (RR/RS or SS/SR) of dispiro 3b and dispiro 3c was isolated, respectively. The $^{31}$P NMR spectral data of the other dispiro phosphazenes …
A New Method For Simultaneous Determination Of Trace Amounts Of Cu(Ii) And Ni(Ii) Ions By Preconcentration And Spectrophotometric Analysis, Berri̇n Topuz, Şennur Merve Adanur, Arda Yalçuk
A New Method For Simultaneous Determination Of Trace Amounts Of Cu(Ii) And Ni(Ii) Ions By Preconcentration And Spectrophotometric Analysis, Berri̇n Topuz, Şennur Merve Adanur, Arda Yalçuk
Turkish Journal of Chemistry
Immediate preconcentration and spectrophotometric methods have been developed for the determination of trace amounts of cupric ion (Cu(II)) and nickel ion (Ni(II)) through a solid phase extraction with XAD-4-N,N'-bis-(salicylidene) cyclohexanediamine (XAD-4-SCHD) resin and a complex color reaction of the ions with 2,6-dimethyl-morpholine dithiocarbamate (DMMDTC) in Triton X-100 media. A high preconcentration factor of 125 was achieved. The spectrophotometric method was based on the measurements of the absorption of colored chelates of ions complexing with DMMDTC, and the adsorptions of the complex solutions were measured at their maximum absorption peaks at 460 and 328 nm for Cu(II) and Ni(II) ions, respectively. …
Synthesis Of Phosphorus-Containing Polyurethanes And Poly(Urethane-Acrylate)S, Mahi̇r Burak Südemen, Hacer Ayşen Önen
Synthesis Of Phosphorus-Containing Polyurethanes And Poly(Urethane-Acrylate)S, Mahi̇r Burak Südemen, Hacer Ayşen Önen
Turkish Journal of Chemistry
Solvent-based polyurethanes and poly(urethane-acrylate)s were synthesized using phosphorus-containing polyester polyols in order to compare the thermal properties of different polymer types. Since the location of the phosphorus group might have vital importance when comparing the thermal properties, phosphorus groups were kept on the pendant chains in poly(urethane-acrylate)s using phosphorus-containing urethane macromonomers while they were kept on the backbone in polyurethanes. The effect of molar mass of polyurethanes and pendant urethane chains of poly(urethane-acrylate)s on thermal properties was also investigated. Characterization of the synthesized polymers was carried out using FT-IR, GPC, NMR, and DSC followed by evaluation of the thermal properties.
Experimental And Computational Studies On The Absorption Properties Of Novel Formazan Derivatives, Gülşen Türkoğlu, M. Emi̇n Çinar
Experimental And Computational Studies On The Absorption Properties Of Novel Formazan Derivatives, Gülşen Türkoğlu, M. Emi̇n Çinar
Turkish Journal of Chemistry
Eight novel 3-(4-(benzyloxy)phenyl)-5-(4-bromophenyl)-1-(4-substituted-phenyl)formazan (4a-4h) were synthesized by coupling of substituted phenylhydrazones with diazonium salts of 4-bromoaniline. The substituted phenylhydrazones, which are intermediate products, were obtained from the condensation of substituted phenylhydrazines with 4-(benzyloxy)benzaldehyde. All target compounds were characterized by using FTIR, $^{1}$H NMR, $^{13}$C NMR, LC$-$MS spectrometry, and elemental analysis. Absorption spectra of these compounds in solvents with different polarities were investigated thoroughly. Time-dependent density functional theory (TD-DFT) studies were conducted to shed light on their electronic structures, Kohn--Sham orbitals, and electronic transitions.
Synthesis, In Vitro Dna Interactions, Cytotoxicities, Antioxidative Activities, And Topoisomerase Inhibition Potentials Of Mn(Ii), Co(Ii), Ni(Ii), Cu(Ii), And Zn(Ii) Complexes With Azo-Oxime Ligands, Melek Çol Ayvaz, İbrahi̇m Turan, Bayram Dural, Seli̇m Demi̇r, Kaan Karaoğlu, Yüksel Ali̇yazicioğlu, Keri̇m Serbest
Synthesis, In Vitro Dna Interactions, Cytotoxicities, Antioxidative Activities, And Topoisomerase Inhibition Potentials Of Mn(Ii), Co(Ii), Ni(Ii), Cu(Ii), And Zn(Ii) Complexes With Azo-Oxime Ligands, Melek Çol Ayvaz, İbrahi̇m Turan, Bayram Dural, Seli̇m Demi̇r, Kaan Karaoğlu, Yüksel Ali̇yazicioğlu, Keri̇m Serbest
Turkish Journal of Chemistry
Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) transition metal complexes of 2-hydroxy-5-[(E)-(4-phenyl) diazenyl] benzaldehyde oxime and 2-hydroxy-5-[(E)-(4-nitrophenyl) diazenyl] benzaldehyde oxime ligands were synthesized and characterized through NMR, IR, ESI mass, and UV analysis. DNA binding abilities of the complexes were revealed using a UV-Vis spectrophotometer with the absorption titration and competitive binding techniques. Hydrolytic and oxidative DNA cleavage activities under different conditions were also proved. Topoisomerase I inhibition efficiencies and in vitro free radical scavenging activities of all complexes were examined. Finally, the selective cytotoxic potentials of all complexes were evaluated in human colon cancer, normal colon, and fibroblast cell lines …
Catalytic Application Of 1,3,5-Triazine-Pentaethylenehexamine Polymer-Supported Palladium Nanoparticles In The Convenient Reduction Of Nitroarenes With Sodium Borohydride Or Hydrazine, Hayri̇ye Genç, Mustafa Zengi̇n, Mustafa Küçüki̇slamoğlu, Mustafa İmamoğlu, Hüseyi̇n Özkan Toplan, Mustafa Arslan
Catalytic Application Of 1,3,5-Triazine-Pentaethylenehexamine Polymer-Supported Palladium Nanoparticles In The Convenient Reduction Of Nitroarenes With Sodium Borohydride Or Hydrazine, Hayri̇ye Genç, Mustafa Zengi̇n, Mustafa Küçüki̇slamoğlu, Mustafa İmamoğlu, Hüseyi̇n Özkan Toplan, Mustafa Arslan
Turkish Journal of Chemistry
The catalytic activity of 1,3,5-triazine-pentaethylenehexamine (TAPEHA) polymer-supported Pd nanoparticles was investigated in the reduction of nitro arenes to the corresponding amines by NaBH$_{4}$ or N$_{2}$H$_{4}$.H$_{2}$O. Optimized reaction conditions for both systems were successfully tested on 20 nitroarenes with different characteristics. Considerably high yields (80%-98% in NaBH$_{4}$ and 85%-98% in N$_{2}$H$_{4})$ were obtained in a short time and at ambient temperature. In addition to these methods being selective against other reducible functionalities such as -CN, -Br, -Cl, and -I, the catalyst can be recovered easily and reused more than ten times.
Understanding Of Phenolic Compound Retention Mechanisms On Pes-Uf Membrane, Amine Mnif, Meral Mouelhi, Bechir Hamrouni
Understanding Of Phenolic Compound Retention Mechanisms On Pes-Uf Membrane, Amine Mnif, Meral Mouelhi, Bechir Hamrouni
Turkish Journal of Chemistry
Ultrafiltration (UF) is investigated as a possible alternative to remove organic compounds from aqueous synthetic solution. This paper presents a comprehensive study towards a better understanding of phenolic compound retention mechanisms during UF processes. Thus, removal of phenol and resorcinol was studied using a polyethersulfone ultrafiltration (PES-UF) membrane. The influence of main operating conditions (feed concentration, transmembrane pressure, and pH) on the retention was evaluated. Membrane--solute interactions were found to play an important role during the process, suggesting the adsorption of the target compounds on the PES-UF membrane. The level of adsorption was consequently evaluated by measuring the quantity of …
Impurity Profiling Of Morphine By Liquid Chromatography-Heated Electrospray Ionization Mass Spectrometry (Lc-Hesi-Ms), Ana Petkovska, Jelena Acevska, Marina Chachorovska, Gjorgji Petrusevski, Gjoshe Stefkov, Rumenka Petkovska, Aneta Dimitrovska, Sonja Ugarkovic
Impurity Profiling Of Morphine By Liquid Chromatography-Heated Electrospray Ionization Mass Spectrometry (Lc-Hesi-Ms), Ana Petkovska, Jelena Acevska, Marina Chachorovska, Gjorgji Petrusevski, Gjoshe Stefkov, Rumenka Petkovska, Aneta Dimitrovska, Sonja Ugarkovic
Turkish Journal of Chemistry
Separation of morphine and its impurities (related substances specified in relevant European Pharmacopoeia monographs, as well as the other naturally occurring coextracted alkaloids) was obtained within a close retention window on a reverse phase HPLC column, eluted with optimized gradient, consisting of methanol and 5 mM ammonium formate, adjusted to pH 10.2. Systematic optimization of the chromatographic conditions was carried out using design of experiments. According to their mass spectra, known and specified impurities were identified and tentative structures for unknown impurities were proposed. MS analyses were performed in positive ionization mode using heated electrospray ionization. Fragmentation patterns of the …
A Simple And Effective Method For Determination Of The Antithyroid Drug Carbimazole Using Ruthenium Trichloride, Mukul Sharma, Afraim Koty, Abdul Jabbar Al Rajab
A Simple And Effective Method For Determination Of The Antithyroid Drug Carbimazole Using Ruthenium Trichloride, Mukul Sharma, Afraim Koty, Abdul Jabbar Al Rajab
Turkish Journal of Chemistry
An accurate, precise, and simple spectrophotometric method is proposed for the determination of the antithyroid drug carbimazole using ruthenium(III) chloride. This method is based on the formation at room temperature of a stable yellow-colored complex with λ$_{max}$ 370 nm. The method has a Beer's law range of 7.81 to 1.95 $\times $ 10$^{2}$ $\mu $g mL$^{-1}$, molar absorptivity coefficient $\varepsilon =$ 1.519 $\times $ 10$^{3}$ L mol$^{-1}$ cm$^{-1}$, and correlation coefficient of 0.997. The metal:ligand (M:L) ratio of the complex was confirmed by the mole ratio and Job's method of continuous variation, suggesting a 1:2 stoichiometry. The formed carbimazole:Ru(III) complex …
Methanolysis Of Jatropha Curcas Oil Using K$_{2}$Co$_{3}$/Cao As A Solid Base Catalyst, Gajanan Sahu, Sujan Saha, Sudipta Datta, Prakash Chavan, Satyanarayan Naik
Methanolysis Of Jatropha Curcas Oil Using K$_{2}$Co$_{3}$/Cao As A Solid Base Catalyst, Gajanan Sahu, Sujan Saha, Sudipta Datta, Prakash Chavan, Satyanarayan Naik
Turkish Journal of Chemistry
Biodiesel, fatty acid methyl ester produced by the transesterification of vegetable oil with methanol, is a promising alternative to petroleum-based diesel fuel. In the present study, the methanolysis of high free fatty acid (FFA) $Jatropha$ $curcas$ oil in a transesterification reaction using K$_{2}$CO$_{3}$/CaO solid base catalyst was studied. The various reaction parameters in the transesterification reaction were also discussed. The catalyst was characterized by means of Fourier transform infrared, X-ray diffraction, temperature programmed desorption of CO$_{2}$, scanning electron microscopy, particle size analyzer, true density, and surface area analyzer. The optimum conversion of jatropha oil was 92% when the transesterification reaction …