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Articles 1 - 30 of 134
Full-Text Articles in Physical Sciences and Mathematics
Modification Of Biomass-Derived Activated Carbon With Magnetic $\Alpha $-Fe$_{2}$O$_{3}$ Nanoparticles For Co$_{2}$ And Ch$_{4}$ Adsorption, Çi̇sem Kirbiyik
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}$/AC composite was prepared by coprecipitation method from the ACs produced. Magnetic and nonmagnetic samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and energy dispersive X-ray spectrometry (EDX) techniques. The textural properties of samples were determined by nitrogen adsorption-desorption using the Brunauer--Emmett--Teller (BET) and Barrett--Joyner--Halenda (BJH) methods. The results showed that the porosity of …
Why Protein Conformers In Molecular Dynamics Simulations Differ From Their Crystal Structures: A Thermodynamic Insight, Fi̇li̇ppo Pullara, Mao Wenzhi, Mert Gür
Why Protein Conformers In Molecular Dynamics Simulations Differ From Their Crystal Structures: A Thermodynamic Insight, Fi̇li̇ppo Pullara, Mao Wenzhi, Mert Gür
Turkish Journal of Chemistry
Conformers generally deviate structurally from their starting X-ray crystal structures early in molecular dynamics (MD) simulations. Studies have recognized such structural differences and attempted to provide an explanation for and justify the necessity of MD equilibrations. However, a detailed explanation based on fundamental physics and validation on a large ensemble of protein structures is still missing. Here we provide the first thermodynamic insights into the radically different thermodynamic conditions of crystallization solutions and conventional MD simulations. Crystallization solution conditions can lead to nonphysiologically high ion concentrations, low temperatures, and crystal packing with strong specific protein--protein interactions, not present under physiological …
Enhanced Uptake Capacities And Isosteric Heats Of Co$_{2}$ And Ch$_{4}$ Adsorption On Spent Coffee Ground Activated Carbons Loaded With Metal Ions, Çi̇sem Kirbiyik, Burak Zafer Büyükbekar, Mahmut Kuş, Mustafa Ersöz
Enhanced Uptake Capacities And Isosteric Heats Of Co$_{2}$ And Ch$_{4}$ Adsorption On Spent Coffee Ground Activated Carbons Loaded With Metal Ions, Çi̇sem Kirbiyik, Burak Zafer Büyükbekar, Mahmut Kuş, Mustafa Ersöz
Turkish Journal of Chemistry
Low-cost activated carbon (AC) samples obtained from waste coffee grounds were used for CO$_{2}$ and CH$_{4}$ adsorption. ACs were prepared by chemical activation and carbonized at three different temperatures. AC carbonized at 800 $^{\circ}$C showed a relatively high surface area (582.92 m$^{2}$ g$^{-1})$ and high adsorption capacities of 2.6 mmol g$^{-1}$ and 1.1 mmol g$^{-1}$ at 25 $^{\circ}$C for CO$_{2}$ and CH$_{4}$, respectively. Adsorbent samples were prepared by loading of Fe$^{3+}$ metal ions onto ACs and their adsorption capacities were compared with those of nonloaded ACs. As expected, the loading of Fe$^{3+}$ metal ions increased the adsorption capacities at all …
Synthesis, Characterization, And Kinetic Studies Of Multifunctionalized Mesoporous Silica For Adsorption Of Zinc, Ali̇me Çitak
Synthesis, Characterization, And Kinetic Studies Of Multifunctionalized Mesoporous Silica For Adsorption Of Zinc, Ali̇me Çitak
Turkish Journal of Chemistry
The aim of this study is to evaluate the utilization of bifunctional mesoporous silica with a platinum and propylsulfonic acid group (Pt/SBA15-PrSO$_{3}$H) as an adsorbent for the removal of Zn(II) ions from aqueous solutions. The SBA15-functionalized organosulfonic acid material was synthesized with a one-step cocondensation synthesis route. The second step was Pt loading during reduction and deposition into the aqueous suspension of the bifunctional mesoporous silica synthesized by an aqueous solution of formaldehyde as the reducing agent. The propylsulfonic acid and platinum functionalized mesoporous silica were characterized by BET, thermogravimetric analysis, and X-ray diffraction methods. The adsorption properties and thermodynamic …
The Effect Of Starting Material Types On The Structure Of Graphene Oxide And Graphene, Fi̇li̇z Boran, Sevi̇l Çeti̇nkaya Gürer
The Effect Of Starting Material Types On The Structure Of Graphene Oxide And Graphene, Fi̇li̇z Boran, Sevi̇l Çeti̇nkaya Gürer
Turkish Journal of Chemistry
In this study, the effects of starting material types on graphene oxide (GO) are reported with the aim of developing graphene (GR) synthesis. The GOs were prepared from natural graphite (NG) powder and graphite nanoplate (GNp) based on the Hummers method. Two kinds of GR were successfully synthesized using GOs, which were prepared from NG and GNp in the presence of hydrazine and ammonia for 24 h at a 100 $^{\circ}$C reaction temperature. The synthesized GOs and GRs were characterized by X-ray diffraction (XRD) techniques, Fourier transform infrared, high-contrast transmission electron microscopy (HCTEM), dispersive Raman spectroscopic analyses, and elemental analyses. …
Investigation Of Sulfuric Acid-Treated Activated Carbon Properties, Neda Asasian Kolur, Seyedmehdi Sharifian, Tahereh Kaghazchi
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 …
Design, Synthesis, And Evaluation Of The Antimycobacterial Activity Of 3-Mercapto-1,2,4-Triazole--Pyrrole Hybrids, Gheorghe Roman, Andra-Cristina Bostanaru, Valentin Nastasa, Mihai Mares
Design, Synthesis, And Evaluation Of The Antimycobacterial Activity Of 3-Mercapto-1,2,4-Triazole--Pyrrole Hybrids, Gheorghe Roman, Andra-Cristina Bostanaru, Valentin Nastasa, Mihai Mares
Turkish Journal of Chemistry
A series of 3-mercapto-1,2,4-triazole--pyrrole hybrids was designed as antimycobacterial agents by employing 5-(4-(1$H$-pyrrol-1-yl)phenyl)-4$H$-1,2,4-triazole-3-thiol as the scaffold onto which several types of moieties were introduced in the triazole ring at N-4 and N-2 and as substituents of the mercapto function. The aforementioned moieties are an allyl or a phenyl moiety at N-4; an aminomethyl group at N-2; or methyl, substituted benzyl, ethoxycarbonylmethyl, or substituted phenacyl at sulfur. Investigation of the compounds in the resulting library as growth inhibitors of Mycobacterium smegmatis showed that their minimum inhibitory concentration was higher than 64 mg/L.
A Case Study Of Antiaromaticity: Carbomethoxy Cyclopropenyl Anion, Zi̇kri̇ Altun, Erdi̇ Ata Bleda, Carl Trindle
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 …
Synthesis And Antitumor Activities Of 2-(Piperidin-4-Yl)-Thiazole-4-Carboxamides Analogues Of Tubulysins, Xiangfu Peng, Mingsha Shao, Shuchao Ma, Lei Yao
Synthesis And Antitumor Activities Of 2-(Piperidin-4-Yl)-Thiazole-4-Carboxamides Analogues Of Tubulysins, Xiangfu Peng, Mingsha Shao, Shuchao Ma, Lei Yao
Turkish Journal of Chemistry
}Tubulysins are a family of natural products that exhibit potent antitumor activities, which have attracted much attention from synthetic and medicinal chemists. Previous attempts to aromatize the Tuv part of tubulysin analogues led to a loss in antitumor activity, which suggested that the Ile and Tuv fragments of these analogues were adopting different conformations than the natural products. In this study, a series of 2-(piperidin-4-yl)-thiazole-4-carboxamides have been prepared to investigate whether an intramolecular H-bond between key NH and OH groups is responsible for the conformational control. The antitumor activities of these analogues have been screened using MDA-MB-231-breast, Siha-cervical, MCF7-breast, and …
Effect Of Crosslinking Patterns On The Properties Of Conjugated Microporous Polymers, Hakan Bi̇ldi̇ri̇r
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 …
A Microwave-Assisted Highly Stereoselective One-Pot Wittig Reaction Under Solvent-Free Conditions, Kalyani Rajkumari, Bittu Lama, Lalthazuala Rokhum
A Microwave-Assisted Highly Stereoselective One-Pot Wittig Reaction Under Solvent-Free Conditions, Kalyani Rajkumari, Bittu Lama, Lalthazuala Rokhum
Turkish Journal of Chemistry
We report a novel microwave-assisted two-step, one-pot protocol for the synthesis of olefins (alkenes) via Wittig reaction. The reaction was carried out under solvent-free conditions using basic alumina both as a heterogeneous catalyst and a solid support. Varieties of aromatic aldehydes were converted into their corresponding olefins within 30-50 min with good to excellent yields. An excellent predominance of E-isomers over Z-isomers (up to 100% E-selectivity) for all the olefin products was observed. This showed the attractive stereocontrol of our reported protocol. In addition, owing to the solid-state nature of the reactions, our procedure prevented the need for tedious aqueous …
Effect Of Brij 35 And Saponin Surfactants On Adsorption Of Diethylstilbestrol As An Emerging Estrogenic Contaminant By Clinoptilolite In Batch And Fixed-Bed Column Experiments, Reyhaneh Saadi, Reza Fazaeli, Leila Vafajoo, Iraj Naser
Effect Of Brij 35 And Saponin Surfactants On Adsorption Of Diethylstilbestrol As An Emerging Estrogenic Contaminant By Clinoptilolite In Batch And Fixed-Bed Column Experiments, Reyhaneh Saadi, Reza Fazaeli, Leila Vafajoo, Iraj Naser
Turkish Journal of Chemistry
In this study, natural clinoptilolite was modified by saponin and Brij 35 surfactants to remove diethylstilbestrol (DES) from wastewater in batch and continuous systems. The optimum pH, amount of adsorbent, contact time, and temperature were 11, 10 g/L, 12 h, and 35 $^{\circ}$C, respectively, for the process. The equilibrium data agreed well with the Langmuir isotherm for natural clinoptilolite (NC), natural clinoptilolite modified by Brij 35 (NC-Brij), and natural clinoptilolite modified by saponin surfactants (NC-saponin) compared to other isotherms. The maximum adsorption capacities resulting from the Langmuir isotherm for NC, NC-Brij, and NC-saponin were 8.012, 23.64, and 39.525 mg/g, respectively. …
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
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.
Determination Of N-Acetylcysteine In The Presence Of Ciprofloxacin Or Levofloxacin In Microparticulate Dry Powder Inhalers, Yağmur Akdağ Çayli, Selma Şahi̇n, Emi̇rhan Nemutlu, Levent Öner
Determination Of N-Acetylcysteine In The Presence Of Ciprofloxacin Or Levofloxacin In Microparticulate Dry Powder Inhalers, Yağmur Akdağ Çayli, Selma Şahi̇n, Emi̇rhan Nemutlu, Levent Öner
Turkish Journal of Chemistry
A fast and easy method was validated for simultaneous determination of ciprofloxacin hydrochloride monohydrate (CP), levofloxacin hemihydrate (LV), and N-acetylcysteine (NAC) in samples. The analysis was performed on a C$_{18}$ column (250 x 4.6 mm, 5 μm) (Inertsil ODS-3V) using an isocratic elution method with a mobile phase composed of 25 mM KH$_{2}$PO$_{4}$ (pH 3.0) and methanol (72:28, v/v) at a flow rate of 1 mL/min. UV detection was performed at 214 nm for NAC and 293 nm for CP and LV. The method was validated for linearity, accuracy, precision (repeatability and reproducibility), specificity, sensitivity, and stability. The calibration study …
Qualitative And Quantitative Determination Of The Effective Components Of The Plants In Different Herbal Slimming Products In Turkey By Hplc, Benan Dursunoğlu, Hafi̇ze Yuca, Sefa Gözcü, Bi̇lal Yilmaz, Zühal Güvenalp
Qualitative And Quantitative Determination Of The Effective Components Of The Plants In Different Herbal Slimming Products In Turkey By Hplc, Benan Dursunoğlu, Hafi̇ze Yuca, Sefa Gözcü, Bi̇lal Yilmaz, Zühal Güvenalp
Turkish Journal of Chemistry
Obesity is a serious disease that can be due to genetic and environmental reasons and is defined by the World Health Organization as abnormal or excessive fat accumulation that may impair health. There is an increasing trend towards herbal slimming products in obesity treatment. The quality control analysis of these products is important for public health. In this study, new, simple, and sensitive high performance liquid chromatography methods were developed for qualitative and quantitative determination of arbutin, hydroquinone, ursolic acid, chlorogenic acid, epigallocatechin gallate, epigallocatechin, epicatechin gallate, and catechin in eleven herbal slimming products in Turkey containing Camellia sinensis, Ilex …
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
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$^{2})$ …
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$_{3}$ …
Spectrophotometric Methods For The Determination Of Fluoride Ion Using Indole-3-Acetic Acid Interaction With Iron(Iii), Emi̇ne İlknur Öztürk, Adnan Kenar, Mehmet Levent Aksu, Mustafa Taşteki̇n
Spectrophotometric Methods For The Determination Of Fluoride Ion Using Indole-3-Acetic Acid Interaction With Iron(Iii), Emi̇ne İlknur Öztürk, Adnan Kenar, Mehmet Levent Aksu, Mustafa Taşteki̇n
Turkish Journal of Chemistry
This study is related to the determination of fluoride ion by the conversion of pink-colored Fe(III) and indole-3-acetic acid (IAA) into a colorless hexafluoride ferrite complex with the addition of fluoride. The optimum conditions of the complex formation were found to be pH 1.7 and a temperature of 60 $^{\circ}$C C. The maximum absorption wavelength of the complex and the detection limit of the method were 525 nm and 0.26 mg/L, respectively. The interfering effects of the different cations (Ag$^{+}$, Al$^{3+}$, Ba$^{2+}$, Ca$^{2+}$, Cd$^{2+}$, Co$^{2+}$, Cu$^{2+}$, K$^{+}$, Mg$^{2+}$, Na$^{+}$, Ni$^{2+}$, Pb$^{2+})$ and anions (SO$_{4}^{2-}$, SO$_{3}^{2-}$, NO$_{2}^{-}$, I$^{-}$, Br$^{-}$, Cl$^{-}$, SCN$^{-}$, …
Synthesis And Characterization Of Polycaprolactone-Based Segmented Polyurethanes, Aysun Güney, Aysel Kiziltay, Nesri̇n Hasirci, Tuğba Endoğan Tanir
Synthesis And Characterization Of Polycaprolactone-Based Segmented Polyurethanes, Aysun Güney, Aysel Kiziltay, Nesri̇n Hasirci, Tuğba Endoğan Tanir
Turkish Journal of Chemistry
Segmented polyurethanes were synthesized by the reactions of poly($\varepsilon $-caprolactone) (PCL)-diol and 1,6-hexamethylene diisocyanate through bulk polymerization without using solvent, initiator, or catalyst. Phase separation and hydrogen bond formation between hard segments or between hard and soft segments were examined by Fourier transform infrared spectroscopy (FTIR)-ATR and X-ray diffraction (XRD), while physical and mechanical properties were studied by atomic force microscope, differential scanning calorimeter, dynamic mechanical analysis, and tensile tester. When the diisocyanate content was increased, deconvolution results of FTIR-ATR in C$=$O and N-H regions demonstrated better miscibility of the segments and XRD results showed a significant decrease in the …
Boric Acid As An Efficient And Green Catalyst For The Synthesis Of 2-Amino-4,6-Diarylnicotinonitrile Under Microwave Irradiation In Solvent-Free Conditions, Zahra Hosseinzadeh, Ali Ramazani, Nima Razzaghi-Asl, Katarzyna Slepokura, Tadeusz Lis
Boric Acid As An Efficient And Green Catalyst For The Synthesis Of 2-Amino-4,6-Diarylnicotinonitrile Under Microwave Irradiation In Solvent-Free Conditions, Zahra Hosseinzadeh, Ali Ramazani, Nima Razzaghi-Asl, Katarzyna Slepokura, Tadeusz Lis
Turkish Journal of Chemistry
Microwave irradiation has been used to improve the one-pot synthesis of substituted 2-amino-4,6-diarylnicoti- nonitrile in the presence of boric acid as an efficient and green catalyst under solvent-free conditions within 48--60 s. All the analogs that have not been reported previously were characterized by their melting points, IR, $^{1}$H NMR, and $^{13}$C NMR spectra. One of the structures was verified by the analysis of a single crystal. The reported synthetic procedure provided remarkable advantages such as short reaction times, excellent yield, facile workup, and the use of a green catalyst.
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
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.
Alpha-Pyrone Glycosides From Scutellaria Salviifolia Benth, Zeynep Doğan, Kan'ichiro Ishiuchi, Toshiaki Makino, İclal Saraçoğlu
Alpha-Pyrone Glycosides From Scutellaria Salviifolia Benth, Zeynep Doğan, Kan'ichiro Ishiuchi, Toshiaki Makino, İclal Saraçoğlu
Turkish Journal of Chemistry
Scutellaria salviifolia Benth. is an endemic species growing in Turkey that belongs to the family Lamiaceae. As a result of a phytochemical study on the aerial parts of S. salviifolia Benth., two new and 10 known compounds were isolated from the aqueous fraction of methanolic extract. The new compounds are methyl-$\alpha $-pyrone glucosides, 3,4-dihydroxy-6-methylpyran-2-one 3-$O$-$\beta $-glucopyranoside (=scusalvioside A, 1), and 3,4-dihydroxy-6-methylpyran-2-one 3-$O$-$\beta $-(6$'$-$O$-$E$-caffeoyl) glucopyranoside (=scusalvioside B, 2) with new skeletal structures. Along with them, 3 phloroglucinol glucosides [phlorin (3), tadehaginoside (4), and 6$^{\prime \prime} $-$O$-$Z$-$p$-coumaroyl phloroglucinol-1-$O$-$\beta $-glucopyranoside (5)], 6 flavonoids [apigenin (6), apigenin 5-$O$-$\beta $-glucopyranoside (7), isoschaftoside (8), luteolin 7-$O$-$\beta …
Gas Sensing With Hexafluoroisopropanol Substituted Phthalocyanines And Vic-Dioximes: A Comparative Study, Mika Harbeck, Zafer Şen, Di̇lek Erbahar, Gülay Gümüş, Emel Musluoğlu
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 …
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
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 …
Bisbenzoxazole Derivatives Had An Antiinflammatory Effect On In Vitro Stimulated Macrophages, Furkan Ayaz, Rusmeenee Kheeree, Qadar Ahmed Isse, Ronak Haj Ersan, Özteki̇n Algül
Bisbenzoxazole Derivatives Had An Antiinflammatory Effect On In Vitro Stimulated Macrophages, Furkan Ayaz, Rusmeenee Kheeree, Qadar Ahmed Isse, Ronak Haj Ersan, Özteki̇n Algül
Turkish Journal of Chemistry
Benzoxazoles are DNA base bioisosteres and studies suggest that their derivatives have antiproliferative activities. Based on their antiproliferative activities they have been mostly studied as new generation anticancer drugs. In our study we exploited their antiproliferative effect, aiming to delineate bisbenzoxazole derivatives' (RHE 231 and RHE 238) potential antiinflammatory effect on mouse macrophages that are activated in vitro through danger signal LPS stimulation. RAW 267.4 mammalian macrophages were activated in the presence of our derivatives with or without danger mimic E. coli derived LPS. We present data that support the strong antiinflammatory activity of the bisbenzoxazole derivatives RHE 231 and …
Synthesis, Characterization, And Nonlinear Optical Properties Of Some New Series Of S-(5-Aryl-1,3,4-Oxadiazol-2-Yl) 2-Chloroethanethioate Derivatives, Zahra Dono Ghezelbash, Hamideh Motiei, Miri Mahmoody, Karim Akbari Delmaghani
Synthesis, Characterization, And Nonlinear Optical Properties Of Some New Series Of S-(5-Aryl-1,3,4-Oxadiazol-2-Yl) 2-Chloroethanethioate Derivatives, Zahra Dono Ghezelbash, Hamideh Motiei, Miri Mahmoody, Karim Akbari Delmaghani
Turkish Journal of Chemistry
In the present investigation, some novel S-(5-aryl-1,3,4-oxadiazol-2-yl)2-chloroethanethioate (3a-3e) derivatives were synthesized and their impact on optical properties was studied. They have also been characterized by elemental analysis and various spectroscopic methods including FTIR, $^{1}$H NMR, $^{13}$C NMR, and UV-Vis techniques. The nonlinear refractive indexes of 3a-3e were also measured in dichloromethane via Z-scan method using a continuous wave diode-pumped laser at 532 nm wavelength. The nonlinear refractive coefficient of compounds was obtained from ${10}^{11}\, \, {m}^{{2}}{/W}$ order. Regarding the appropriate nonlinearity of these compounds, they could be considered good candidates for biooptical and photonic applications. All the synthesized compounds (3a-3e) …
Investigation Of The Ideal Composition Of Metal Hexacyanocobaltates With High Water Oxidation Catalytic Activity, Ferdi̇ Karadaş
Investigation Of The Ideal Composition Of Metal Hexacyanocobaltates With High Water Oxidation Catalytic Activity, Ferdi̇ Karadaş
Turkish Journal of Chemistry
The electrocatalytic activities of Prussian blue analogues (PBAs) have recently received much attention due to their robustness and efficiency. Considering that PBAs with hexacyanocobaltate building block stand forward among other PBAs, a systematic study on a family of metal hexacyanocobaltates is presented in this study. Metal hexacyanocobaltates (M $=$ Co, Mn, Ni, and Fe) were prepared, characterized, and electrochemical studies were performed. A series of mixed-metal cobalt-iron hexacyanocobaltates has also been studied to determine the ideal composition of a metal hexacyanocobaltate for electrocatalytic water oxidation process. The overall study clearly indicates that cobalt hexacyanocobaltate exhibits the highest electrocatalytic activity among …
Pore Length- And Ion Concentration-Dependent Ionic Current In Cylindrical Nanopores: An Atomistic Molecular Dynamics Study, Nazar İleri̇ Ercan
Pore Length- And Ion Concentration-Dependent Ionic Current In Cylindrical Nanopores: An Atomistic Molecular Dynamics Study, Nazar İleri̇ Ercan
Turkish Journal of Chemistry
The sensing of individual molecules as they pass through nanopores under an external field is a popular research field. The approach is simply based on the detectable temporary blockades in the ionic current as the molecules pass through the nanopores. These signatures of the current have been shown to be a function of nanoparticle and nanopore size and geometry as well as the external electric field. However, models developed in this context fail to predict the experimentally observed behavior in technologically important shorter nanopores. Here we present atomistic molecular dynamics simulation results from colloidal nanoparticle translocation through mid-to-low aspect ratio …
Fuel Characteristics And Combustion Behavior Of Seaweed-Derived Hydrochars, İsmai̇l Cem Kantarli, Mehmet Pala, Yeli̇z Yildirim, Jale Yanik, Maria Helena Abreu
Fuel Characteristics And Combustion Behavior Of Seaweed-Derived Hydrochars, İsmai̇l Cem Kantarli, Mehmet Pala, Yeli̇z Yildirim, Jale Yanik, Maria Helena Abreu
Turkish Journal of Chemistry
In this study, conversion of seaweeds into hydrochars was investigated with the aim of obtaining a renewable energy feedstock. The seaweeds Fucus serratus and Alaria esculenta, and a mixture of seaweeds, mainly consisting of Cystoseria sp$.$ and Laurencia sp$.$, were subjected to hydrothermal carbonization (HTC) in subcritical water at three different temperatures: 200, 225, and 250 $^{\circ}$C. Fuel characteristics and chemical properties of the derived hydrochars were determined using the standard fuel analysis and spectroscopic methods. The combustion behavior of seaweeds and hydrochars was examined via nonisothermal thermogravimetric analysis under air atmosphere. The seaweed-derived hydrochar yields were lower than those …
Organotemplate-Free Cs-Abw Nanozeolite As Highly Reactive And Recyclable Catalyst For Henry Reaction Between Benzaldehyde And Nitroethane, Tamara Mahmoud Ali Ghrear, Ka Lun Wong, Soon Huat Tan, Tau Chuan Ling, Hussein Awala, Engpoh Ng
Organotemplate-Free Cs-Abw Nanozeolite As Highly Reactive And Recyclable Catalyst For Henry Reaction Between Benzaldehyde And Nitroethane, Tamara Mahmoud Ali Ghrear, Ka Lun Wong, Soon Huat Tan, Tau Chuan Ling, Hussein Awala, Engpoh Ng
Turkish Journal of Chemistry
Zeolite Cs-ABW nanocatalyst has been hydrothermally synthesized without using any harmful organic template. The zeolite nanocrystal with very high solid yield (81.88%) can be obtained within 60 min and at 180 $^{\circ}$C (∼ 20 atm), conditions that are much faster and gentler than the existing synthesis methods. The orthorhombic Cs-ABW nanocrystals (mean size of 32 nm) have high aluminum content (Si/Al ratio $=$ 1.14) and possess high basicity. The nanocrystals also exhibit better catalytic activity than conventional homogeneous catalysts in the Henry (nitroaldol) reaction of benzaldehyde with nitroethane under microwave heating conditions. The nanocatalyst does not suffer from coking and …