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2019

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Removal Of Cr(Vi) From Wastewater Through Glycine Assisted Synthesis Of Tio$_{2}$, Bi̇lsen Kurtteki̇n, Demet Özer, Nurşen Altuntaş Öztaş Jan 2019

Removal Of Cr(Vi) From Wastewater Through Glycine Assisted Synthesis Of Tio$_{2}$, Bi̇lsen Kurtteki̇n, Demet Özer, Nurşen Altuntaş Öztaş

Turkish Journal of Chemistry

In this study, titanium dioxide was synthesized via solution combustion method. Titanium(IV) oxysulfate was used as a titanium source. The fuel type, reaction time, and reaction temperature were tested for optimization. The glycine was set as a suitable fuel. Structural properties of the final product were characterized by p-XRD. Scanning electron microscopy (SEM) and BET techniques were used to examine the morphology. The synthesized products were compared to the commercial TiO$_{2}$ and it was found that the titanium dioxide with the high surface area (63.628 m$^{2}$/g) has been successfully synthesized by solution combustion method with time and energy saving. In …

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The Effect Of Washing On Stabilized And Unstabilized Low-Density Polyethylene Films Naturally Weathered In A Sub-Saharan Region (Ghardaia, Algeria, Souad Behissa, Salem Fouad Chabira, Nourelhouda Benmiloud, Mohamed Sebaa Jan 2019

The Effect Of Washing On Stabilized And Unstabilized Low-Density Polyethylene Films Naturally Weathered In A Sub-Saharan Region (Ghardaia, Algeria, Souad Behissa, Salem Fouad Chabira, Nourelhouda Benmiloud, Mohamed Sebaa

Turkish Journal of Chemistry

The effect of washing stabilized and unstabilized blown extruded films of low-density polyethylene (LDPE) used for greenhouse coverings naturally weathered in a sub-Saharan facility at Ghardaia (Algeria) for 19 and 6 months, respectively, was studied. A comparison between unwashed and daily washed samples was done. The changes in the films' properties were followed at regular intervals using various characterization methods (physicochemical and mechanical). Although in both cases the chemical species formed due to the weathering were qualitatively the same, they essentially differed in their concentrations, namely they were higher for the washed samples than for the unwashed ones. Inversely, the …

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An Exploration Of New Avenues Regarding Deep Tissue Penetration And Higher Singlet Oxygen Efficiencies: Novel Near-Ir Photosensitizers For Photodynamic Therapy, Ni̇sa Yeşi̇lgül, Bi̇lal Kiliç Jan 2019

An Exploration Of New Avenues Regarding Deep Tissue Penetration And Higher Singlet Oxygen Efficiencies: Novel Near-Ir Photosensitizers For Photodynamic Therapy, Ni̇sa Yeşi̇lgül, Bi̇lal Kiliç

Turkish Journal of Chemistry

A series of novel BODIPY-bearing electron-withdrawing groups at the meso position are reported here. According to the optical measurements, it may be clearly seen that the introduction of electron-donating groups into 3,5-positions and the presence of electron-withdrawing groups at the meso position of the BODIPY core resulted in spectacular bathochromic shifts (up to ∼ 304 nm), and the projected photosensitizers had absorption bands in the therapeutic window of the electromagnetic spectrum (600-900 nm). The absorption maxima of compounds 4,5,6, and 7 were at 886 nm, 890 nm, 760 nm, and 761 nm, respectively. The singlet oxygen generation experiments revealed that …

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Intermolecular Complexes Of Halocyclopropenone Derivatives With The Hypohalous Acids Hof, Hocl, Hobr, And Hoi, Dariush Mirzaei, Abedien Zabardasti, Yaghoub Mansourpanah Jan 2019

Intermolecular Complexes Of Halocyclopropenone Derivatives With The Hypohalous Acids Hof, Hocl, Hobr, And Hoi, Dariush Mirzaei, Abedien Zabardasti, Yaghoub Mansourpanah

Turkish Journal of Chemistry

The intermolecular interactions between halocyclopropenone derivatives (HC$_{3}$OX; X $=$ I, Br, Cl, and F) and hypohalous acids (HOY; Y $=$ I, Br, Cl, and F) were studied via the MP2 method utilizing the aug-cc-pVTZ and aug-cc-pVTZ(-PP) basis sets. The three types of complexes were hydrogen bonds, halogen bonds, and complexes containing both hydrogen and halogen bonds. The results obtained indicated that interactions in the Type 1 complexes were stronger than those in Types 2 and 3. The H-O bonds revealed red shifts with complex formation in Types 1 and 2. The O-Y bonds displayed red shifts in the Type 3 …

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Preparation Of Epoxidized Sunflower Oil Metal Soap Derivatives And Their Use As Heat Stabilizers For Polyvinyl Chloride, Ouassila Chelil, Naima Belhaneche-Bensemra, Daniel Lopez Garcia, Marta Fernandez-Garcia, Mohamed Tahar Benaniba Jan 2019

Preparation Of Epoxidized Sunflower Oil Metal Soap Derivatives And Their Use As Heat Stabilizers For Polyvinyl Chloride, Ouassila Chelil, Naima Belhaneche-Bensemra, Daniel Lopez Garcia, Marta Fernandez-Garcia, Mohamed Tahar Benaniba

Turkish Journal of Chemistry

The aim of this work was to prepare metal soaps of epoxidized sunflower oil (ESO) and use them as thermal stabilizers for polyvinyl chloride (PVC). For that purpose, commercial sunflower oil was first epoxidized and then used to prepare (Ba, Zn, Pb, and Cd) metal soap derivatives, which were characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The prepared metal soaps derivatives of ESO were used as thermal stabilizers for plasticized PVC. Discoloration, residual thermal stability at 200 $^{\circ}$C , and rheological properties of PVC samples were tested. The structural modifications were investigated …

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Effect Of Crosslinking Patterns On The Properties Of Conjugated Microporous Polymers, Hakan Bi̇ldi̇ri̇r Jan 2019

Effect Of Crosslinking Patterns On The Properties Of Conjugated Microporous Polymers, Hakan Bi̇ldi̇ri̇r

Turkish Journal of Chemistry

Syntheses and detailed spectroscopic characterizations of two similar conjugated microporous polymers formed by A4 $+$ B2 and A2 $+$ B3 type functional monomers via Sonogashira--Hagihara polycondensation are presented in this report. The two porous polymeric networks possess mono-, di-, and tri- (1-, 1,4-, and 1,3,5-, respectively) substituted benzene rings and fused thiophenic moieties (dithienothiophenes). Because of the different conjugation patterns, their solid state nuclear magnetic resonance, infrared, and ultraviolet/visible light absorption analyses indicated significant differences. Besides the discussions on the porous properties of the obtained polymeric networks, the presented spectroscopic investigations can be useful for identifying the structure-property relationship of …

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Chiral 1,4-Aminoalkylphenols For Enantioselective Diethylzinc Addition To Aldehydes, Ömer Di̇lek, Mustafa Ali̇ Tezeren, Tahi̇r Ti̇lki̇, Erkan Ertürk Jan 2019

Chiral 1,4-Aminoalkylphenols For Enantioselective Diethylzinc Addition To Aldehydes, Ömer Di̇lek, Mustafa Ali̇ Tezeren, Tahi̇r Ti̇lki̇, Erkan Ertürk

Turkish Journal of Chemistry

Starting from a chiral secondary alcohol, novel enantiopure 1,4-aminoalkylphenols (AAPs) were prepared by exploiting conventional organic transformations such as the Mitsunobu reaction, Eschweiler--Clarke N-methylation, and demethylation of anisoles. The catalytic activity of the 1,4-AAPs was investigated in enantioselective Et$_{2}$Zn addition to benzaldehyde. They were found to accelerate the Et$_{2}$Zn addition to benzaldehyde. High yields and enantioselectivities (e.g., 95% yield and 82% ee) were achieved.

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Modification Of Biomass-Derived Activated Carbon With Magnetic $\Alpha $-Fe$_{2}$O$_{3}$ Nanoparticles For Co$_{2}$ And Ch$_{4}$ Adsorption, Çi̇sem Kirbiyik Jan 2019

Modification Of Biomass-Derived Activated Carbon With Magnetic $\Alpha $-Fe$_{2}$O$_{3}$ Nanoparticles For Co$_{2}$ And Ch$_{4}$ Adsorption, Çi̇sem Kirbiyik

Turkish Journal of Chemistry

Magnetic and nonmagnetic activated carbons (ACs) were successfully prepared by using AC obtained from spent coffee grounds (SCGs) for use in CO$_{2}$ and CH$_{4}$ capture. SCGs were activated by chemical activation to produce ACs and a magnetic $\alpha $-Fe$_{2}$O$_{3}$/AC composite was prepared by coprecipitation method from the ACs produced. Magnetic and nonmagnetic samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and energy dispersive X-ray spectrometry (EDX) techniques. The textural properties of samples were determined by nitrogen adsorption-desorption using the Brunauer--Emmett--Teller (BET) and Barrett--Joyner--Halenda (BJH) methods. The results showed that the porosity of …

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Synthesis And Antimicrobial Activity Of 1-(Benzo[B]Thiophen-4-Yl)-4-(2-(Oxo, Hydroxyl, And Fluoro)-2-Phenylethyl)Piperazine And 1-(Benzo[D]Isothiazole-3-Yl)-4-(2-(Oxo, Hydroxy, And Fluoro)-2-Phenylethyl)Piperazine Derivatives, Vaibhav Mishra, Tejpal Singh Chundawat Jan 2019

Synthesis And Antimicrobial Activity Of 1-(Benzo[B]Thiophen-4-Yl)-4-(2-(Oxo, Hydroxyl, And Fluoro)-2-Phenylethyl)Piperazine And 1-(Benzo[D]Isothiazole-3-Yl)-4-(2-(Oxo, Hydroxy, And Fluoro)-2-Phenylethyl)Piperazine Derivatives, Vaibhav Mishra, Tejpal Singh Chundawat

Turkish Journal of Chemistry

Twenty-two compounds in a series of 1-(benzo[$b$]thiophen-4-yl)-4-(2-(oxo, hydroxy, and fluoro)-2-phenylethyl) piperazine and 1-(benzo[$d$]isothiazole-3-yl)-4-(2-(oxo, hydroxy, and fluoro)-2-phenylethyl)-piperazine derivatives were synthesized through nucleophilic substitution reaction of phenacyl bromides with hetero arylpiperazine, reduction, and then fluorination. Compound K2 showed potent activity against gram-negative bacterial stain P. aeruginosa with minimum inhibitory concentration (MIC) value of 12.5 μg/mL. This compound showed better inhibitory activity than the standard drug chloramphenicol. K4 against S. aureus, H2 against P. aeruginosa, and F4 against E. coli showed good inhibitory activity with MIC values of 62.5 μg/mL. Compounds K1, K2, K4, K8, F1, and F3 showed good inhibitory activity against …

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A Case Study Of Antiaromaticity: Carbomethoxy Cyclopropenyl Anion, Zi̇kri̇ Altun, Erdi̇ Ata Bleda, Carl Trindle Jan 2019

A Case Study Of Antiaromaticity: Carbomethoxy Cyclopropenyl Anion, Zi̇kri̇ Altun, Erdi̇ Ata Bleda, Carl Trindle

Turkish Journal of Chemistry

The simplest ideas of antiaromaticity refer to regular monocyclic systems and the eigenfunctions of the H\"{u}ckel Hamiltonian for 4n $\pi $ electrons in such systems. The antiaromaticity is expressed in the energy penalty for such idealized systems relative to the H\"{u}ckel energy for 2n noninteracting $\pi $ pairs. Observed systems seldom achieve the regular planar geometry assumed in this picture, owing to their ability to ease the antiaromaticity penalty by departures from the regular geometry and also by export of the 4n $\pi $ electrons' charge to substituents. In this report we estimate numerical values for the stabilization derived from …

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Investigation Of Sulfuric Acid-Treated Activated Carbon Properties, Neda Asasian Kolur, Seyedmehdi Sharifian, Tahereh Kaghazchi Jan 2019

Investigation Of Sulfuric Acid-Treated Activated Carbon Properties, Neda Asasian Kolur, Seyedmehdi Sharifian, Tahereh Kaghazchi

Turkish Journal of Chemistry

A granulated type of commercial activated carbon (GAC) with surface area of 828 m$^{2}$/g was treated with a strong solution of sulfuric acid (98% wt.) at a temperature of 30 $^{\circ}$C . The physicochemical and porous properties and the surface chemistry of the sorbents were investigated and compared in detail. It was established that the lower temperatures of impregnation and the higher concentration of H$_{2}$SO$_{4}$ solution resulted in the introduction of higher percentages of sulfur-containing groups and smaller porosity loss. The results of EDS, FTIR, and XPS tests confirmed the introduction of sulfone groups and acidic oxygenated ones, which increased …

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Effect Of Fe Substitution On The Partial Oxidation Of Methane To Syngas Over La$_{0.7}$Sr$_{0.3}$Co$_{1-Y}$Fe$_{Y}$O$_{3-\Delta}$ Perovskites, Adilah Aliyatulmuna, Perry Burhan, Bambang Prijamboedi, Hamzah Fansuri, Irmina Kris Murwani Jan 2019

Effect Of Fe Substitution On The Partial Oxidation Of Methane To Syngas Over La$_{0.7}$Sr$_{0.3}$Co$_{1-Y}$Fe$_{Y}$O$_{3-\Delta}$ Perovskites, Adilah Aliyatulmuna, Perry Burhan, Bambang Prijamboedi, Hamzah Fansuri, Irmina Kris Murwani

Turkish Journal of Chemistry

In this research, a series of La$_{0.7}$Sr$_{0.3}$Co$_{1-y}$Fe$_{y}$O$_{3-\delta }$ ($y =$ 0.0--0.4) was successfully synthesized by a solid-state reaction method and syngas production studies were performed using gas chromatography. Thermogravimetric analysis characterized the concentration of Fe$^{3+}$, which gave a low H$_{2}$/CO ratio over La$_{0.7}$Sr$_{0.3}$Co$_{1-y}$Fe$_{y}$O$_{3-\delta }$ without the presence of molecular oxygen. All samples possessed a purely rhombohedral structure. The incorporation of more Fe increased the lattice parameter and changed XRD peaks of the La$_{1-x}$Sr$_{x}$Co$_{0.8}$Fe$_{0.2}$O$_{3}$ from sharp and single to double. Among the catalyst powders tested for syngas production activity, La$_{0.7}$Sr$_{0.3}$Co$_{0.6}$Fe$_{0.4}$O$_{3-\delta }$ ($y =$ 0.4) had the low molar ratio of H$_{2}$/CO …

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Improvement Of The Mechanical And Thermal Properties Of Polyester Nonwoven Fabrics By Ptfe Coating, Fatemeh Ashrafi, Mohammad Reza Babaei Lavasani Jan 2019

Improvement Of The Mechanical And Thermal Properties Of Polyester Nonwoven Fabrics By Ptfe Coating, Fatemeh Ashrafi, Mohammad Reza Babaei Lavasani

Turkish Journal of Chemistry

Polyester (polyethylene terephthalate) is one of the most widely used polymers in textiles. Despite all the advantages of this polymer, its low thermal resistance limits its use in filters and protective textiles. On the other hand, polyester nonwovens are used in many products as wipes, filters, and padding. The surface properties of polyester nonwovens are often not perfect for a specific application and need to be modified. Different ways, including coating, have been developed to modify their surface properties. Therefore, in the present study attempts were made to investigate the improvement of the thermal resistance of a polyester nonwoven by …

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Tribological Behavior And Quantum Chemical Calculations Of Protic Ionic Liquids: Synthesis, Spectroscopic, And Thermal Properties, Ahmet Karadağ, Hüseyi̇n Akbaş, Duran Karakaş, Kadi̇r Ci̇han Teki̇n, Erdem Korkmazer Jan 2019

Tribological Behavior And Quantum Chemical Calculations Of Protic Ionic Liquids: Synthesis, Spectroscopic, And Thermal Properties, Ahmet Karadağ, Hüseyi̇n Akbaş, Duran Karakaş, Kadi̇r Ci̇han Teki̇n, Erdem Korkmazer

Turkish Journal of Chemistry

Protic ionic liquids (PILs) were synthesized through a stoichiometric neutralization reaction between 2,2$' $-(ethylenedioxy)-bis(ethylamine) { Edbea} and various acids (formic, acetic, boric, decanoic, and gentisic acid). The PILs were characterized by elemental analyses, FTIR, $^{1}$H and $^{13}$C NMR spectroscopy, and thermogravimetric analysis. All the PILs except PIL3 were liquid at room temperature. The viscosity of the PILs (PIL1, 2, 4, 5) was measured using a cone-and-plate viscometer at ambient temperature. Quantum chemical calculations were used to explain the cation/anion ratio in the PILs. Reaction energies in the gas phase calculated at M062X/6-311$+$G(d,p) level were used to determine the cation/anion ratio. …

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Electrochemical Oxidation Of Curcuminoids: An Experimental And Computational Investigation, Zeynep Kalaycioğlu, Nurgül Karadaş, Mehmet Emi̇n Çinar, Si̇bel Ayşil Özkan, Duri̇şehvar Özer Ünal, Ayşegül Gölcü, Fatma Bedi̇a Eri̇m Jan 2019

Electrochemical Oxidation Of Curcuminoids: An Experimental And Computational Investigation, Zeynep Kalaycioğlu, Nurgül Karadaş, Mehmet Emi̇n Çinar, Si̇bel Ayşil Özkan, Duri̇şehvar Özer Ünal, Ayşegül Gölcü, Fatma Bedi̇a Eri̇m

Turkish Journal of Chemistry

Curcuminoids, reported to have important biological properties, such as antioxidant, anti-Alzheimer, and antidiabetic properties, comprise curcumin (CRM; 1,7-bis [4-hydroxy-3-methoxyphenyl]-1,6-heptadiene-3,5-dione) and its derivatives demethoxycurcumin (DMC; (E,6E)-1-(3,4-dimethoxy-cyclohexyl)-7-(3,4-dimethoxyphenyl)hepta-1,6-diene-3,5-dione) and bisdemethoxycurcumin (BDMC; 1,7-bis[4-hydroxyphenyl]-1,6-heptadiene-3,5-dione). Their electrochemical oxidations are thoroughly explored by applying cyclic and differential pulse voltammetric techniques. The dependence of current intensities and potentials on pH, concentration, scan rate, and nature of the buffer was investigated. The outcome is supported by density functional theory computations indicating the transfer of 4-e$^{-}$/H$^{+}$, 6-e$^{-}$/H$^{+}$, and 8-e$^{-}$/H$^{+}$ couples involved in the oxidation mechanisms of CRM, DMC, and BDMC, respectively, leading to the formation of the same oxidized product.

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Comparative Study On Physicochemical And Mechanical Characterization Of New Nanocarbon-Based Hydroxyapatite Nanocomposites, Reka Barabas, Dennis Deemter, Gabriel Katona, Gabriel Batin, Laszlo Barabas, Liliana Bizo, Oana Cadar Jan 2019

Comparative Study On Physicochemical And Mechanical Characterization Of New Nanocarbon-Based Hydroxyapatite Nanocomposites, Reka Barabas, Dennis Deemter, Gabriel Katona, Gabriel Batin, Laszlo Barabas, Liliana Bizo, Oana Cadar

Turkish Journal of Chemistry

This study evaluated the effect of different additives such as nanocarbon compounds (0.5, 1.0, and 2.0 wt.%) with different morphologies and gelatin (Gel) (10 wt.%) on the mechanical properties of hydroxyapatite (Hap)-based nanocomposites (NCs). The NCs were prepared using the innovation process "SmartBox" based on the Internet of things (IoT), which provides process control and reproducibility, and they were characterized by X-ray diffraction, particle size distribution, transmission electron microscopy, Fourier transform infrared spectroscopy, and thermal analysis. The compressive strength tests demonstrated that the use of grapheme oxide (Hap_ GO_ 2.0 - 133 N/mm$^{2})$, and/or Gel (Hap_ Gel - 152 N/mm$^{2})$ …

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Methyl-Substituted 2-Aminothiazole--Based Cobalt(Ii) And Silver(I) Complexes: Synthesis, X-Ray Structures, And Biological Activities, Ezzat Khan, Tufail Ahmad, Zarif Gul, Farhat Ullah, Muhammad Nawaz Tahir, Awal Noor Jan 2019

Methyl-Substituted 2-Aminothiazole--Based Cobalt(Ii) And Silver(I) Complexes: Synthesis, X-Ray Structures, And Biological Activities, Ezzat Khan, Tufail Ahmad, Zarif Gul, Farhat Ullah, Muhammad Nawaz Tahir, Awal Noor

Turkish Journal of Chemistry

2-Aminothiazole derivatives bear three nucleophilic centers, i.e. endocyclic N, exocyclic NH$_{2}$, and S atom in the ring system. In addition to these centers there are $\pi$-electrons in the ring system which can also expectedly be involved in some sort of coordination. To the best of our knowledge the solid state coordination chemistry of such ligands has not been fully presented in the literature. These ligands (2-amino-4-methylthiazole and 2-amino-5-methylthiazole) were coupled with CoCl$_{2}$ under aerobic conditions to form tetrahedral complexes, bis(2-amino-4-methylthiazole)dichlorocobalt(II) (1) and bis(2-amino-5-methylthiazole)dichlorocobalt(II) (2). Reaction of 2-amino-5-methylthiazole with AgNO$_{3}$ led to an expected two-coordinated, bis(2-amino-5-methylthiazole)silver(I) nitrate (3) as crystalline material. …

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Determination Of Triacylglycerols And Fatty Acid Composition Of Chilopsis Linearis Seed Oil By Reverse-Phase High-Performance Liquid Chromatography, Anh Van Nguyen, Victor Ivanovic Deineka, Lyudmila Aleksandrovna Deineka, Anh Thi Ngoc Vu Jan 2019

Determination Of Triacylglycerols And Fatty Acid Composition Of Chilopsis Linearis Seed Oil By Reverse-Phase High-Performance Liquid Chromatography, Anh Van Nguyen, Victor Ivanovic Deineka, Lyudmila Aleksandrovna Deineka, Anh Thi Ngoc Vu

Turkish Journal of Chemistry

In the present work, the compositions of the 27 triacylglycerols (TAGs) as well as fatty acid composition of Chilopsis linearis seed oil were determined by reverse-phase high-performance liquid chromatography (RP-HPLC) with diode array and mass spectrometric detections. It was shown that the main conjugated acid in the seed oil is a catalpic acid, (9E,11E,13Z)-octadeca-9,11,13-trienoic acid, while two unusual fatty acids have the parameters satisfying the literature data for (10E,12E)-octadeca-10,12-dienoic and (9E,12E)-octadeca-9,12-dienoic acids. For the two conjugated acid substituents the isosbestic point (at 234 nm) was found and was used to calculate the ratios of TAGs with different chromophores in the …

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Gas Sensing With Hexafluoroisopropanol Substituted Phthalocyanines And Vic-Dioximes: A Comparative Study, Mika Harbeck, Zafer Şen, Di̇lek Erbahar, Gülay Gümüş, Emel Musluoğlu Jan 2019

Gas Sensing With Hexafluoroisopropanol Substituted Phthalocyanines And Vic-Dioximes: A Comparative Study, Mika Harbeck, Zafer Şen, Di̇lek Erbahar, Gülay Gümüş, Emel Musluoğlu

Turkish Journal of Chemistry

Phthalocyanines (Pcs) are established sensitive materials for chemical gas sensors due to their superb sensing characteristics and the achievable manifold in their analyte interaction properties. Their sorption properties are determined by the metal ion center and substituents attached to the periphery of the ring system. Similarly, vic-dioximes can be modified in their sorption properties and employed as sensitive materials. In this work, a nickel Pc and various vic-dioximes functionalized with the same hexafluoroisopropanol moiety are assessed and compared in their gas-sensing properties using the quartz crystal microbalance for the first time. This specific substituent is selected for its hydrogen bond …

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Synthesis Of Tetrakis Bromine Terminated Phthalocyanine And Its Methyl Methacrylate Polymers Via Atr, Tuba Çakir Çanak, Damla Yeşi̇ldağ, Ilgin Nar, Esi̇n Hamuryudan, İbrahi̇m Ersi̇n Serhatli Jan 2019

Synthesis Of Tetrakis Bromine Terminated Phthalocyanine And Its Methyl Methacrylate Polymers Via Atr, Tuba Çakir Çanak, Damla Yeşi̇ldağ, Ilgin Nar, Esi̇n Hamuryudan, İbrahi̇m Ersi̇n Serhatli

Turkish Journal of Chemistry

A phthalocyanine (Pc) initiator, tetrakis(2-bromopropyloxyester)ethylthiophthalocyaninatozinc(II) (ZnPc-Br), was prepared and successfully applied to atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) for the first time. Bromine end groups of the synthesized Pc took part in the initiation of the MMA chain growth. Polymerization was demonstrated by monomodal molecular weight distribution of the synthesized polymers and their increasing molecular weight behavior with reaction time. UV-Vis absorption, fluorescence, and transmittance properties of the polymers were also examined. The results indicate that the ZnPc-Br-based initiator is potentially applicable in ATRP applied to MMA in order to obtain and develop functional acrylic materials.

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Sustainable Process For The Production Of Symmetrical Dibasic Acid Ester-Based Thermal Energy Storage Materials From Lipids, Ayhan Yildirim, Kaan Kiraylar Jan 2019

Sustainable Process For The Production Of Symmetrical Dibasic Acid Ester-Based Thermal Energy Storage Materials From Lipids, Ayhan Yildirim, Kaan Kiraylar

Turkish Journal of Chemistry

Oleochemical-based long-chain diesters are potential organic phase change materials convenient for thermal energy storage. The development of efficient and green methods is an important requirement for the preparation of these environmentally friendly compounds, which also are finding wide industrial application. Thus, in the present work, a series of dibasic acid esters were synthesized through ionic liquid catalyzed scalable chemical esterification or transesterification reactions in a solvent-free medium. The starting compounds, dicarboxylic acids or their methyl esters and fatty alcohols or cholesterol, were reacted in the ratio of 1:2 respectively and the synthesized esters were characterized by FT-IR, $^{1}$H NMR, and …

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Improving The Mechanical And Thermal Properties Of Chlorinated Poly(Vinyl Chloride) By Incorporating Modified Caco$_{3}$ Nanoparticles As A Filler Jan 2019

Improving The Mechanical And Thermal Properties Of Chlorinated Poly(Vinyl Chloride) By Incorporating Modified Caco$_{3}$ Nanoparticles As A Filler

Turkish Journal of Chemistry

Chlorinated poly(vinyl chloride) (CPVC)/calcium carbonate nanocomposites were successfully prepared by the incorporation of calcium carbonate (CaCO$_{3})$ nanoparticles into the CPVC matrix. The compatibility between the two phases was obtained by surface modification of the CaCO$_{3}$ nanoparticles with stearic acid, leading to improved material performance. The effects of the addition of different amounts of CaCO$_{3}$ nanoparticles to the CPVC on the thermal, mechanical, and morphological characteristics of the CPVC/CaCO$_{3}$ nanocomposites were investigated. The thermal stability of the CPVC/CaCO$_{3}$ nanocomposites was evaluated by thermogravimetric analysis~and differential scanning calorimetry. In addition, the surface texture of the CPVC and the dispersion of the CaCO$_{3}$ …

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The Protective Effect Of N-Acetylcysteine Amide Against Paraquat-Induced Neurotoxicity, Burhan Ateş, Ni̇gar Vardi, Hakan Parlakpinar, Merve Gökşi̇n Karaaslan, İsmet Yilmaz, Nuran Ercal Jan 2019

The Protective Effect Of N-Acetylcysteine Amide Against Paraquat-Induced Neurotoxicity, Burhan Ateş, Ni̇gar Vardi, Hakan Parlakpinar, Merve Gökşi̇n Karaaslan, İsmet Yilmaz, Nuran Ercal

Turkish Journal of Chemistry

N-acetylcysteine amide (NACA) is a new antioxidant molecule with powerful radical scavenging properties. The aim of this study was to investigate neuroprotective effects of NACA against paraquat (PQ) toxicity in the midbrains of rats by using motor coordination tests and biochemical and histological analysis. Thirty adult Wistar albino rats were divided into three groups: Group 1: control (n = 10), Group 2: PQ (10 mg/kg) (n = 10), and Group 3: PQ (10 mg/kg) $+$ NACA (100 mg/kg) (n = 10). NACA was administrated intraperitoneally 30 min before PQ injection. Performance was measured for a period of 28 days. The …

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Electrodeposition Of Tin(Ii) From Citrate Complexes, Yuliya Yapontseva, Valeriy Kublanovsky Jan 2019

Electrodeposition Of Tin(Ii) From Citrate Complexes, Yuliya Yapontseva, Valeriy Kublanovsky

Turkish Journal of Chemistry

This paper provides the calculation of the distribution of the concentrations of complex particles of the Sn(II) - citrate - water system in the solution volume, on the surface of the electrode, and in the diffusion layer for the tin citrate electrolyte containing an excess of the ligand. Based on the calculations for the electrodeposition of tin, an electrolyte containing [SnCit]$^{2-}$ complex at pH 8.0 was chosen. The kinetic parameters of the discharge stage, the diffusion coefficient of the electrochemical active ion, and the current efficiency of tin were determined by the methods of stationary voltammetry and chronovoltamperometry. It is …

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Novel "Turn Off-On" Sensors For Detection Of Dna-Acrylamide Interaction Using Zns Quantum Dots As A Phosphorescent Probe, Hayri̇ye Eda Şatana Kara Jan 2019

Novel "Turn Off-On" Sensors For Detection Of Dna-Acrylamide Interaction Using Zns Quantum Dots As A Phosphorescent Probe, Hayri̇ye Eda Şatana Kara

Turkish Journal of Chemistry

A novel "turn off-on" sensor for detection of interaction between DNA and acrylamide (ACR) was developed. In this method, L-cysteine capped Mn-doped ZnS quantum dots (QDs) were used as room temperature phosphorescent probes. In the ``turn-off'' mode, ACR was absorbed onto the surface of QDs via electrostatic interaction, which caused a quenching effect of room-temperature phosphorescence signal by photoinduced electron-transfer mechanism. ACR was removed from the QDs' surface with the addition of DNA. Thus, the phosphorescence emission of QDs was recovered and the system was turned to the ``turn-on'' mode. The quenching mechanism of QDs by ACR was collisional (dynamic) …

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Rapid And On-Site Electrochemical Detection Of Bisphenol A And Arsenic In Drinking Water Using A Novel Electrode Array, Yildiz Uludağ, Zehra Ölçer, Canan Doğan, Turghun Muhammad, Zeynep Altintaş Jan 2019

Rapid And On-Site Electrochemical Detection Of Bisphenol A And Arsenic In Drinking Water Using A Novel Electrode Array, Yildiz Uludağ, Zehra Ölçer, Canan Doğan, Turghun Muhammad, Zeynep Altintaş

Turkish Journal of Chemistry

The paper describes a novel dip-and-gauge hand-held sensor device for the rapid, cost-effective, and on-site detection of bisphenol A and arsenic in drinking water samples. Different working electrode diameters ranging from 1.5 mm to 4 mm were designed and fabricated to construct a new electrochemical biosensor. The sensor was employed for the chronoamperometric detection of bisphenol A and voltammetric determination of arsenic in drinking water samples. Bisphenol A measurements resulted in a detection limit of 10 ng mL$^{-1}$ with a linear range of 0-4000 ng mL$^{-1}$. Baby products and bottles have to be completely free of bisphenol and hence a …

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Chemistry Of Endemic \Textit{Tanacetum Mucroniferum} Hub.-Mor. {\&} Grierson Extracts And Three New Sesquiterpene Lactones, Hüseyi̇n Servi̇, Nezhun Gören Jan 2019

Chemistry Of Endemic \Textit{Tanacetum Mucroniferum} Hub.-Mor. {\&} Grierson Extracts And Three New Sesquiterpene Lactones, Hüseyi̇n Servi̇, Nezhun Gören

Turkish Journal of Chemistry

Tanacetum mucroniferum Hub.-Mor. & Grierson was collected from Sakaltutan in Erzincan Province of Turkey. Comparative phytochemical investigation was carried out on the ethyl acetate and methanol extracts of the plant. The secondary metabolites were isolated and purified by chromatographic methods such as column chromatography, medium pressure liquid chromatography, high-performance thin-layer chromatography, and preparative thin-layer chromatography. The extracts of the aerial parts of Tanacetum mucroniferum yielded three new sesquiterpene lactones and some known compounds, namely two sesquiterpene lactones, six flavonoids, three coumarins, and one triterpene. Structures of isolated compounds were determined by IR, UV, $^{1}$H NMR, APT, COSY, HSQC, HMBC, NOESY, …

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An Efficient Protocol For The Synthesis Of Brominated Norbornene, Norbornadiene, And Benzonorbornadiene, Selçuk Eşsi̇z Jan 2019

An Efficient Protocol For The Synthesis Of Brominated Norbornene, Norbornadiene, And Benzonorbornadiene, Selçuk Eşsi̇z

Turkish Journal of Chemistry

An efficient protocol for the synthesis of 2-bromonorbornene, 2-bromonorbornadiene, 2-bromoben- zonorbornadiene, 2,3-dibromonorbornene, 2,3-dibromonorbornadiene, and 2,3-dibromobenzonorbornadiene in good yields has been developed. 1,2-Dibromotetrachloroethane is used as the brominating agent for these reactions. The results are discussed in comparison with alternative methods in the literature.

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Synthesis Of Novel Azo Linkage-Based Schiff Bases Including Anthranilic Acid And Hexanoic Acid Moieties: Investigation Of Azo-Hydrazone And Phenol-Keto Tautomerism, Solvatochromism, And Ionochromism, Özlem Özdemi̇r Jan 2019

Synthesis Of Novel Azo Linkage-Based Schiff Bases Including Anthranilic Acid And Hexanoic Acid Moieties: Investigation Of Azo-Hydrazone And Phenol-Keto Tautomerism, Solvatochromism, And Ionochromism, Özlem Özdemi̇r

Turkish Journal of Chemistry

Two new azo-Schiff base receptors (L$_{{1}}$ and L$_{{2}})$ containing azo and azomethine groups with a conjugated group (benzyl ring of anthranilic acid, in L$_{{1}})$ and electron-donating group (alkyl chain of hexanoic acid, in L$_{{2}})$ were synthesized and characterized. Azo-hydrazone/phenol-keto tautomerism and solvatochromism were investigated. Studying their sensing ability towards cations (Co$^{2+}$, Cu$^{2+}$, Zn$^{2+}$, Ni$^{2+}$, Pb$^{2+}$, Cd$^{2+}$, Mn$^{2+}$, Fe$^{3+}$, Cr$^{3+}$, and Al$^{3+})$, high sensitivity and selectivity were recorded for Fe$^{3+}$ by naked eye and UV-Vis spectra in DMF-aqueous HEPES buffer (v:v, 1:1, pH 6.8). The color of L$_{{1}}$ and L$_{{2}})$ solutions instantly changed from yellow to deep orange and pale orange. …

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Progress In The Chemistry Of 3-Amino-9-Ethylcarbazole, Samir Bondock, Salwa Alqahtani, Ahmed M. Fouda Jan 2019

Progress In The Chemistry Of 3-Amino-9-Ethylcarbazole, Samir Bondock, Salwa Alqahtani, Ahmed M. Fouda

Turkish Journal of Chemistry

Generally, 3-amino-9-ethylcarbazole is considered a versatile compound not only for its unique electronic properties but also for its significance as a building block in synthetic, pharmaceutical, and material chemistry. The synthesis, chemical reactivity, and applications of 3-amino-9-ethylcarbazole are described in this review. The presence of the amino group at position 3 exhibits a unique reactivity with both C-2 and C-4. The reactions of 3-amino-9-ethylcarbazole are divided into three categories, reactions that involve the amino group and cyclization reactions that involve the amino group and C-2 and/or C-4. In this review, relevant and appropriate applications of the synthesized, isolated, and condensed …

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