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Synthesis, Spectroscopic, Thermal, Crystal Structure Properties And Characterization Of New Hofmann-Type-Like Clathrates With 4-Aminopyridine And Water, Zeki̇ Kartal, Onur Şahi̇n
Synthesis, Spectroscopic, Thermal, Crystal Structure Properties And Characterization Of New Hofmann-Type-Like Clathrates With 4-Aminopyridine And Water, Zeki̇ Kartal, Onur Şahi̇n
Turkish Journal of Chemistry
In this study, synthesis of two new heteronuclear tetracyanonickelate(II) clathrates based on 4-aminopyridine (4AP) and guest water (H2O) molecule and investigation of their structural properties were reported. These clathrates were characterized by using vibration spectroscopy, elemental, thermal analysis and single crystal X-ray diffraction (SC-XRD) techniques. Examining the elemental and spectral data of these clathrates, it was observed that the formulas [Zn(II)(4AP)2Ni(μ-CN)2 (CN)2]·6H2O and [Cu(II)(4AP)4Ni(μ- CN)2 (CN)2]·H2O were defined their structures. General information about the structural properties of these clathrates in single crystal form has been obtained by considering the changes in the characteristic peaks of the cyanide group and the …
The Protective Role Of Melatonin Under Heavy Metal-Induced Stress In Melissa Officinalis L., Elvisa Hodzic, Semira Galijasevic, Milica Balaban, Sebila Rekanovic, Halid Makic, Biljana Kukavica, Dijana Mihajlovic
The Protective Role Of Melatonin Under Heavy Metal-Induced Stress In Melissa Officinalis L., Elvisa Hodzic, Semira Galijasevic, Milica Balaban, Sebila Rekanovic, Halid Makic, Biljana Kukavica, Dijana Mihajlovic
Turkish Journal of Chemistry
Heavy metals, due to their inability to degrade, pose a serious environmental and nutritional problem. The accumulation of essential and non-essential heavy metals in living organisms reduces normal growth and development, resulting in acute poisoning, disease and even death of organisms. Melatonin is a very important multifunctional molecule in protecting plants from oxidative stress due to its ability to directly neutralize reactive oxygen species (ROS). Also, melatonin has a chelating property, which may contribute in reducing metal-induced toxicity. In this paper, the protective role of melatonin in counteracting metal-induced free radical generation was highlighted. Using the HPLC-FLD technique melatonin was …
Scalable Activated Carbon/Graphene Based Supercapacitors With Improved Capacitanceretention At High Current Densities, İffet Işil Gürten
Scalable Activated Carbon/Graphene Based Supercapacitors With Improved Capacitanceretention At High Current Densities, İffet Işil Gürten
Turkish Journal of Chemistry
Scalable, highly stable supercapacitor electrodes were developed from the mixture of a tea factory waste based activated carbon (AC) and a low-cost electrochemical exfoliated graphene (EEG). The hybrid electrodes showed notably enhanced stability at high current densities. The AC sample was prepared by chemical method and exposed to a further heat treatment to enhance electrochemical performance. Graphene used in the preparation of hybrid electrodes was obtained by direct electrochemical exfoliation of graphite in an aqueous solution. Detailed structural characterization of AC, EEG, and hybrid material was performed. The original electrochemical performances of AC and EEG were examined in button size …
Spectrophotometric And Colorimetric Determination Of Gallium (Iii) With P-Aminohippuricacid-Functionalized Citrate Capped Gold Nanoparticles, Asi̇ye Aslihan Avan
Spectrophotometric And Colorimetric Determination Of Gallium (Iii) With P-Aminohippuricacid-Functionalized Citrate Capped Gold Nanoparticles, Asi̇ye Aslihan Avan
Turkish Journal of Chemistry
A new technique for sensing Ga(III) concentration based on polyvinyl alcohol-citrate capped gold nanoparticle-p-aminohippuric acid hybrid (or three-layer core-shell configurations) has been demonstrated. The p-aminohippuric acid capped citrate-gold nanoparticles were comfortably agglomerated in the presence of Ga(III), and the color of the reaction quickly turned from red to violet or blue. Under the detection conditions, a good linear relationship was ideally obtained between the ratio of the absorbance intensity at 620 nm to that at 520 nm (A620/A520). The linear response range, the detection, and quantification limit was 34.9-418.3 μg/L and 7.6 μg/L, and 25 μg/L, respectively. To reflect the …
Application Of Synthesized Copper Nanoparticles Using Aqueous Extract Ofziziphus Mauritiana L. Leaves As A Colorimetric Sensor For The Detection Of Ag$^{+}$, Roomia Memon, Ayaz Ali Memon, Syed Tufail Hussain Sherazi, Siraj Uddin, Aamna Balouch, Muhammad Raza Shah, Sarfaraz Ahmed Mahesar, Kauser Rajar, Muhammad Hassan Agheem
Application Of Synthesized Copper Nanoparticles Using Aqueous Extract Ofziziphus Mauritiana L. Leaves As A Colorimetric Sensor For The Detection Of Ag$^{+}$, Roomia Memon, Ayaz Ali Memon, Syed Tufail Hussain Sherazi, Siraj Uddin, Aamna Balouch, Muhammad Raza Shah, Sarfaraz Ahmed Mahesar, Kauser Rajar, Muhammad Hassan Agheem
Turkish Journal of Chemistry
The presented work demonstrates the preparation of copper nanoparticles (CuNPs) via aqueous leaves extract of Ziziphus mauritiana L. (Zm) using hydrazine as a reducing agent. Various parameters such as volume of extract, concentration of hydrazine hydrate, concentration of copper chloride, and pH of the solution were optimized to obtain Ziziphus mauritiana L. leaves extract derived copper nanoparticles (Zm-CuNPs). Brownish red color was initial indication of the formation of Zm-CuNPs while it was confirmed by surface plasmon resonance (SPR) band at wavelength of 584 nm using ultraviolet-visible (UV-vis) spectroscopy. Synthesized Zm-CuNPs were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron …
Corrosion And Wear Behaviour Of Highly Porous Ti-Tib-Tin$_{\Mathbf{X}}$ In Situ Composites In Simulated Physiological Solution, Fati̇h Toptan
Corrosion And Wear Behaviour Of Highly Porous Ti-Tib-Tin$_{\Mathbf{X}}$ In Situ Composites In Simulated Physiological Solution, Fati̇h Toptan
Turkish Journal of Chemistry
Highly porous Ti matrix composites can be a solution for some of the major clinical concerns for the load bearing implants such as low tribocorrosion resistance, stress shielding, and lack of biological anchorage. In order to respond to these needs, highly porous Ti-TiB-TiN$_{x}$ in-situ composites were synthesized by pressureless sintering using BN as reactant and urea as space holder. Corrosion behaviour was investigated at body temperature, in phosphate buffer saline solution (PBS), by measuring open circuit potential (OCP) and cyclic polarization. Wear behaviour was studied in PBS by reciprocating against a 10 mm diameter alumina ball under 3 N of …
Blue Tio2 Nanotube Arrays As Semimetallic Materials With Enhanced Photoelectrochemical Activity Towards Water Splitting, Naeimeh Sadat Peighambardoust, Umut Aydemir
Blue Tio2 Nanotube Arrays As Semimetallic Materials With Enhanced Photoelectrochemical Activity Towards Water Splitting, Naeimeh Sadat Peighambardoust, Umut Aydemir
Turkish Journal of Chemistry
In the past years there has been a great interest in self-doped TiO2 nanotubes (blue TiO2 nanotubes) compared to undoped ones owing to their high carrier density and conductivity. In this study, blue TiO2 nanotubes are investigated as photoanode materials for photoelectrochemical water splitting. Blue TiO2 nanotubes were fabricated with enhanced photoresponse behavior through electrochemical cathodic polarization on undoped and annealed TiO2 nanotubes. The annealing temperature of undoped TiO2 nanotubes was tuned before cathodic polarization, revealing that annealing at 500 °C improved the photoresponse of the nanotubes significantly. Further optimization of the blue TiO2 nanotubes was achieved by adjusting the …
Water Management Improvement In Pem Fuel Cells Via Addition Of Pdms Or Aptespolymers To The Catalyst Layer, Hande Ungan, Ayşe Bayrakçeken Yurtcan
Water Management Improvement In Pem Fuel Cells Via Addition Of Pdms Or Aptespolymers To The Catalyst Layer, Hande Ungan, Ayşe Bayrakçeken Yurtcan
Turkish Journal of Chemistry
Water management is one of the obstacles in the development and commercialization of proton exchange membrane fuel cells (PEMFCs). Sufficient humidification of the membrane directly affects the PEM fuel cell performance. Therefore, 2 different hydrophobic polymers, polydimethylsiloxane (PDMS) and (3-Aminopropyl) triethoxysilane (APTES), were tested at different percentages (5, 10, and 20 wt.%) in the catalyst layer. The solution was loaded onto the surface of a 25 BC gas diffusion layer (GDL) via the spraying method. The performance of the obtained fuel cells was compared with the performance of the commercial catalyst. Characterizations of each surface, including different amounts of PDMS …
A Road Map To Assess Critical Materials Content In Boron Industrial Wastes Usingsustainable Micro-X-Ray Fluorescence And Total Reflection X-Ray Fluorescenceinstrumentation, İbrahi̇m Kula, Christian Gutsche, Yunus Erdoğan, Andreas Fittschen, Ursula Elisabeth Adriane Fittschen
A Road Map To Assess Critical Materials Content In Boron Industrial Wastes Usingsustainable Micro-X-Ray Fluorescence And Total Reflection X-Ray Fluorescenceinstrumentation, İbrahi̇m Kula, Christian Gutsche, Yunus Erdoğan, Andreas Fittschen, Ursula Elisabeth Adriane Fittschen
Turkish Journal of Chemistry
Turkey is the leading country in the world in terms of boron production and sale. Increasing boron production goes along with an increasing generation of boron wastes. The pollution of the soil and the air around the waste piles, as well as the occupation of several square kilometers of ground, are major environmental problems. It is, therefore, very important to make use of the wastes to both protect the environment and create revenue. This work presenteda road map for fast screening of boron waste for critical elements followed by determination of the elements using small footprint low power instrumentation. The …
L-Proline/Cholesterol And Diosgenin Based Thiourea Cooperative System For The Directasymmetric Aldol Reaction In The Presence Of Water, Serkan Eymur, Eni̇s Taşci, Arzu Uyanik, Mustafa Yilmaz
L-Proline/Cholesterol And Diosgenin Based Thiourea Cooperative System For The Directasymmetric Aldol Reaction In The Presence Of Water, Serkan Eymur, Eni̇s Taşci, Arzu Uyanik, Mustafa Yilmaz
Turkish Journal of Chemistry
A series of cholesterol and based hydrophobic urea and thiourea compounds were synthesized and successfully used as a cocatalyst for L-proline catalyzed aldol reactions in the presence of water. The anticonfigured products were obtained with good yields (up to 94%), high diastereoselectivities (up to 95:5), and high enantiomeric excesses (up to 93% ee). The successful results for catalytic efficiency of L-proline in the presence of water reveal the importance of the hydrophobic nature of cholesterol and diosgenin parts of thiourea on the reactivity and selectivity in the presence of water.
A Novel Selective Fluorescent Chemosensor For Fe$^{3+}$ Ions Based On Phthalonitrile Dimer:Synthesis, Analysis, And Theoretical Studies, Shaya Al-Raqa, İpek Ömeroğlu, Doğan Erbahar, Mahmut Durmuş
A Novel Selective Fluorescent Chemosensor For Fe$^{3+}$ Ions Based On Phthalonitrile Dimer:Synthesis, Analysis, And Theoretical Studies, Shaya Al-Raqa, İpek Ömeroğlu, Doğan Erbahar, Mahmut Durmuş
Turkish Journal of Chemistry
Phenyl-4,4-di(3,6-dibutoxyphthalonitrile) (3) was synthesized by the reaction of 1,4-phenylenebisboronic acid (1) and 4-bromo-3,6-dibutoxyphthalonitrile (2), using Suzuki cross-coupling reaction. The newly synthesized compound (3) was characterized by FT-IR, MALDI-MS, ESI-MS, $^{1}$H-NMR, $^{13}$C-NMR, and $^{13}$C-DEPT-135-NMR. The fluorescence property of phenyl-4,4-di(3,6- dibutoxyphthalonitrile) (3) towards various metal ions was investigated by fluorescence spectroscopy, and it was observed thatthe compound (3) displayed a significantly `turn-off? response to Fe$^{3+}$, which was referred to 1:2 complex formation between ligand (3) and Fe$^{3+}$. The compound was also studied via density functional theory calculations revealing the interaction mechanism of the molecule with Fe$^{3+}$ ions.
Determination Of Blood Glucose Parameter From Human Blood Serum By Using A Quartzcrystal Microbalance Sensor Coated With Phthalocyanines Compounds, Evi̇n Şahi̇n Sadik, Hamdi̇ Meli̇h Saraoğlu, İlke Gürol, Mehmet Ali̇ Ebeoğlu, Fatma Emel Koçak
Determination Of Blood Glucose Parameter From Human Blood Serum By Using A Quartzcrystal Microbalance Sensor Coated With Phthalocyanines Compounds, Evi̇n Şahi̇n Sadik, Hamdi̇ Meli̇h Saraoğlu, İlke Gürol, Mehmet Ali̇ Ebeoğlu, Fatma Emel Koçak
Turkish Journal of Chemistry
Determining the blood glucose level is important for the prevention and treatment of diabetes mellitus. We developed a sensor system using Quartz Crystal Microbalance (QCM) to determine the blood glucose level from human blood serum. This study consists of two experimental stages: artificial glucose/pure water solution tests and human blood serum tests. In the first stage of the study, the QCM sensor with the highest performance was identified using artificial glucose solution concentrations. In the second stage of the study, human blood serum measurements were performed using QCM to determine blood glucose levels. QCM sensors were coated with phthalocyanines (Pcs) …
A Novel Molecular Imprinting Polymer For The Selective Adsorptionof D-Arabinitol From Spiked Urine, Yuni Retnaningtyas, Ganden Supriyanto, Ni Nyoman Tri Puspaningsih, Roedi Irawan, Siswandono Siswodihardjo
A Novel Molecular Imprinting Polymer For The Selective Adsorptionof D-Arabinitol From Spiked Urine, Yuni Retnaningtyas, Ganden Supriyanto, Ni Nyoman Tri Puspaningsih, Roedi Irawan, Siswandono Siswodihardjo
Turkish Journal of Chemistry
In this research, molecular imprinting polymers (MIPs) for D-arabinitol were synthesized using a bulk polymerization method through a noncovalent approach. The MIPs were prepared by using D-arabinitol as a template, acrylamide as a functional monomer, ethylene glycol dimethacrylateas cross-linker, benzoyl peroxide as an initiator and dimethyl sulfoxideas a porogen. MIPS was synthesized in several formulas with a different molar ratio of template to functional monomers and cross-linker. Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) were used to characterize the MIPs produced. A batch rebinding assay was used to test the binding efficiency of each formula. Batch rebinding test …
Artificial Intelligence-Based Models For The Qualitative And Quantitative Prediction Of Aphytochemical Compound Using Hplc Method, Abdullahi Garba Usman, Seli̇n Işik, Sani Isah Abba, Fi̇li̇z Meri̇çli̇
Artificial Intelligence-Based Models For The Qualitative And Quantitative Prediction Of Aphytochemical Compound Using Hplc Method, Abdullahi Garba Usman, Seli̇n Işik, Sani Isah Abba, Fi̇li̇z Meri̇çli̇
Turkish Journal of Chemistry
Isoquercitrin is a flavonoid chemical compound that can be extracted from different plant species such as Mangifera indica (mango), Rheum nobile, Annona squamosal, Camellia sinensis (tea), and coriander (Coriandrum sativum L.). It possesses various biological activities such as the prevention of thromboembolism and has anticancer, antiinflammatory, and antifatigue activities. Therefore, there is a critical need to elucidate and predict the qualitative and quantitative properties of this phytochemical compound using the high performance liquid chromatography (HPLC) technique. In this paper, three different nonlinear models including artificial neural network (ANN), adaptive neuro-fuzzy inference system (ANFIS), and support vector machine (SVM),in addition to …
Flowerlike Hybrid Horseradish Peroxidase Nanobiocatalyst For The Polymerization Of Guaiacol, Ersen Göktürk
Flowerlike Hybrid Horseradish Peroxidase Nanobiocatalyst For The Polymerization Of Guaiacol, Ersen Göktürk
Turkish Journal of Chemistry
In this study, the catalytic activity and stability of flowerlike hybrid horseradish peroxidase (HRP) nanobiocatalyst (HRP-Cu$^{2+}$) obtained from Cu$^{2+}$ ions and HRP enzyme in the polymerization reaction of guaiacol were analyzed. We demonstrated that HRP-Cu$^{2+}$ and hydrogen peroxide (H$_{2}$O$_{2}$) initiator showed significantly increased catalytic activity and stability on the polymerization of guaiacol compared to that of free HRP enzyme. Poly(guaiacol) was observed with quite high yields (88%) and molecular weights (38,000 g/mol) under pH 7.4 phosphate-buffered saline (PBS) conditions at 60 °C with 5 weight% of HRP-Cu$^{2+}$ loading. HRP-Cu$^{2+}$ also shows very high thermal stability and works even at 70 …
Phase Separation Behavior Of Whey Protein Isolate Particle Dispersions In The Presence Ofxanthan, Alev Emi̇ne İnce Coşkun
Phase Separation Behavior Of Whey Protein Isolate Particle Dispersions In The Presence Ofxanthan, Alev Emi̇ne İnce Coşkun
Turkish Journal of Chemistry
In this study, phase separation of colloidal whey protein isolate (WPI) particle dispersions was studied using a rod-like polysaccharide xanthan. Effects of different xanthan concentration, particle volume fraction, and temperature were analyzed by visual observations, turbidity measurements, and particle mobility tracking method. Particle mobility was determined using a diffusing wave spectroscopy (DWS) set up. Xanthan concentration was kept low in order not to increase the viscosity of dispersions, so that the phase separation could be observed easily. Visual observations showed that there was a minimum concentration of xanthan to induce phase separation at a constant particle volume fraction, and xanthan …
Design, Synthesis, And Spasmolytic Activity Of Thiophene-Based Derivatives Via Suzukicross-Coupling Reaction Of 5-Bromothiophene-2-Carboxylic Acid: Their Structural Andcomputational Studies, Nasir Rasool, Hafiz Mansoor Ikram, Ammara Rashid, Nazia Afzal, Muhammad Ali Hashmi, Muhammad Naeem Khan, Ayesha Khan, Imran Imran, Hafiz Muhammad Abdur Rahman, Syed Adnan Ali Shah
Design, Synthesis, And Spasmolytic Activity Of Thiophene-Based Derivatives Via Suzukicross-Coupling Reaction Of 5-Bromothiophene-2-Carboxylic Acid: Their Structural Andcomputational Studies, Nasir Rasool, Hafiz Mansoor Ikram, Ammara Rashid, Nazia Afzal, Muhammad Ali Hashmi, Muhammad Naeem Khan, Ayesha Khan, Imran Imran, Hafiz Muhammad Abdur Rahman, Syed Adnan Ali Shah
Turkish Journal of Chemistry
In the current research work, a facile synthesis of a series of novel thiophene-based derivatives of 5-bromothiophene-2- carboxylic acid (1) have been synthesized. All analogs (5a-5e, 10a-10f) were obtained from the coupling reaction of 5-bromothiophene- 2-carboxylic acid (1) and different arylboronic acids with moderate-to-good yields under controlled and optimal conditions. The structures of the newly synthesized compounds were characterized through spectral analysis and their spasmolytic activity, and most of the compounds exhibited potentially good spasmolytic effect. Among the synthesized analogs, compound phenethyl 5-(3,4-dichlorophenyl)thiophene-2-carboxylate (10d) particular showed an excellent spasmolytic effect with an EC$_{50}$ value of 1.26. All of the compounds …
Tuning The Mechanical Properties And Degradation Properties Of Polydioxanoneisothermal Annealing, Xiliang Liu, Shaomin Feng, Xin Wang, Jin Qi, Dong Lei, Yadong Li, Wei Bai
Tuning The Mechanical Properties And Degradation Properties Of Polydioxanoneisothermal Annealing, Xiliang Liu, Shaomin Feng, Xin Wang, Jin Qi, Dong Lei, Yadong Li, Wei Bai
Turkish Journal of Chemistry
Polydioxanone (PPDO) is synthesized by ring-opening polymerization of p-dioxanone, using stannous octoate as the catalyst. The polarized optical micrograph (POM) shows thes pherulite growth rate of PPDO decreases with an increase in the isothermal crystallization temperature. PPDO is compression-molded into bars, and PPDO bars are subjected to isothermal annealing at a range of temperatures (Ta = 50, 60, 70, 80, 90, and 100 °C), and correspond to three different annealing times (ta = 1h, 2h, 3h). The effect on PPDO is investigated by using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). With …
An Efficient Approach For The Synthesis Of Novel Methyl Sulfones In Acetic Acid Mediumand Evaluation Of Antimicrobial Activity, Gollapudi Ravi Kumar, Chandra Rao Dasireddy, Ravi Varala, Vijay Kotra, Hari Babu Bollikolla
An Efficient Approach For The Synthesis Of Novel Methyl Sulfones In Acetic Acid Mediumand Evaluation Of Antimicrobial Activity, Gollapudi Ravi Kumar, Chandra Rao Dasireddy, Ravi Varala, Vijay Kotra, Hari Babu Bollikolla
Turkish Journal of Chemistry
A series of nine methyl sulphones (3a-3i) starting from the aldehydes (1a-1i) were synthesized in two consecutive steps. In the first step, preparation of allyl alcohols (2a-2i) from their corresponding aldehydes by the reaction of sodium borohydride in methanol at room temperature is reported. Finally, methyl sulphones are synthesized by condensing sodium methyl sulfinates with allyl alcohols in the presence of BF$_{3}$.Et$_{2}$O in acetic acid medium at room temperature for about 2-3 h. The reaction conditions are simple, yields are high (85%-95%), and the products were obtained with good purity. All the synthesized compounds were characterized by their $^{1}$H, $^{13}$C …
Mathematical Modeling Of A Continuous-Flow Packed-Bed Reactor With Immobilizedlipase For Kinetic Resolution Of (R,S)-2-Pentanol, Asli Soyer Malyemez, Abdulwahap Giwa, Emi̇ne Bayraktar, Ülkü Mehmetoğlu
Mathematical Modeling Of A Continuous-Flow Packed-Bed Reactor With Immobilizedlipase For Kinetic Resolution Of (R,S)-2-Pentanol, Asli Soyer Malyemez, Abdulwahap Giwa, Emi̇ne Bayraktar, Ülkü Mehmetoğlu
Turkish Journal of Chemistry
In this study, the kinetic resolution of (R,S)-2-pentanol via transesterification to achieve S-2-pentanol, a key intermediate required in the synthesis of anti-Alzheimer drugs, was investigated in continuous-flow packed-bed reactors. The effects of residence time, substrate concentration, and operation time of the enzyme were investigated. Under steady state conditions, 50% conversion and enantiomeric excess of the substrate (ee$_{S}$)>99% were achieved at a residence time of 0.04 min. Productivity of the continuous-flow process (1.341 mmol/min/g)was about 4 times higher than that of the corresponding batch process (0.363 mmol/min/g). In addition, the mathematical modeling of the packed-bed reactor was conductedusing an axial …
Synthesis And Characterization Of Hexagonal Boron Nitride Used For Comparison Of Removal Of Anionic And Cationic Hazardous Azo-Dye: Kinetics And Equilibrium Studies, Tuba Tarhan
Turkish Journal of Chemistry
The purpose of this study was to compare the adsorption behavior of cationic and anionic dyes onto a hexagonal boron nitride (hBN) nanostructure that was rich in a negative charge. Herein, the hBN nanostructure was synthesized using boric acid as a precursor material. The characteristic peaks of the hBN nanostructure were performed using Fourier transform infrared (FT-IR) and Raman spectroscopies. The morphology and the particle size of hBN nanostructure were determined by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). During the studies, various essential adsorption parameters were investigated, such as the initial dye concentration, pH of the dye …
Characterization And Kinetics Analysis Of The Thermal Decomposition Of The Humic Substance From Hazelnut Husk, Fatma Kara, Duygu Adigüzel, Ufuk Atmaca, Murat Çeli̇k, Jale Nakti̇yok
Characterization And Kinetics Analysis Of The Thermal Decomposition Of The Humic Substance From Hazelnut Husk, Fatma Kara, Duygu Adigüzel, Ufuk Atmaca, Murat Çeli̇k, Jale Nakti̇yok
Turkish Journal of Chemistry
A humic substance was obtained from hazelnut husk using an alkali extraction. The chemical and morphological structure of the humic matter was characterized via elemental analysis, Fourier transform infrared spectrometry (FTIR), nuclear magnetic resonance, Brunauer-Emmet-Teller (BET) analysis, scanning electron microscopy (SEM), and thermogravimetric-FTIR (TG-FTIR). In addition, thermal analysis measurements TG analysis-differential thermogravimetry/differential scanning calorimetry (TGA-DTG/ DSC) were performed under dynamic air conditions to better determine the origin, physical and chemical structure, and decomposition process of the humic matter. The Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) methods were used to calculate the kinetic parameters of the high-temperature decomposition process. It was observed …
Synthesis And Structural Analysis Of Nonstoichiometric Ternary Fulleride K1.5ba0.25csc60, Havva Esma Okur Kutay
Synthesis And Structural Analysis Of Nonstoichiometric Ternary Fulleride K1.5ba0.25csc60, Havva Esma Okur Kutay
Turkish Journal of Chemistry
The existence of cation-vacancy sites in fullerides might lead to long-range ordering and generate a new vacancy-ordered superstructure. The purpose of this work is to search whether or not long-range ordering of vacant tetrahedral sites, namely superstructure emerges in nonstoichiometric K1.5Ba0.25CsC60 fulleride. Therefore, K1.5Ba0.25CsC60 with cation-vacancy sites is synthesized using a precursor method to avoid inadequate stoichiometry control and formation of impurity phases within the target composition. For this purpose, first, phase-pure K6C60, Ba6C60 and Cs6C60 precursors are synthesized. Stoichiometric quantities of these precursors are used for further reaction with C60 to afford K1.5Ba0.25CsC60. Rietveld analysis of the high-resolution synchrotron …
Synthesis And Electrochemical Properties Of Copper(Ii), Manganese(Iii) Phthalocyanines Bearing Chalcone Groups At Peripheral Or Nonperipheral Positions, Hüseyi̇n Baş, Nuran Kahri̇man, Zekeri̇ya Biyiklioğlu
Synthesis And Electrochemical Properties Of Copper(Ii), Manganese(Iii) Phthalocyanines Bearing Chalcone Groups At Peripheral Or Nonperipheral Positions, Hüseyi̇n Baş, Nuran Kahri̇man, Zekeri̇ya Biyiklioğlu
Turkish Journal of Chemistry
In this study, new chalcone compound 1, new phthalonitrile derivatives 2 and 3, new copper(II), manganese(III) phthalocyanines bearing chalcone groups at peripheral or nonperipheral positions were synthesized. Electrochemistry of tetra-(4- {(2E)-3-[2-fluoro-4-(trifluoromethyl)phenyl]prop-2-enoyl}phenoxy) substituted Co(II)Pc and Mn(III)Pcs were studied with cyclic voltammetry (CV) to determine the redox properties of the phthalocyanines. According to the results, while the CuPcs 2a and 3a showed two Pc based reduction reactions and one Pc based oxidation reaction, MnPcs 2b and 3b gave two metal-based reduction reactions. All the redox processes are shifted toward positive potentials as a result of the increased electron-withdrawing ability of the trifluoromethyl …
Effective Synthesis Of Bicyclodienes Via Palladium-Catalyzed Asymmetric Allylic Alkylationand Ruthenium-Catalyzed Cycloisomerization, Ni̇zam Havare
Effective Synthesis Of Bicyclodienes Via Palladium-Catalyzed Asymmetric Allylic Alkylationand Ruthenium-Catalyzed Cycloisomerization, Ni̇zam Havare
Turkish Journal of Chemistry
[n.3.0]Bicycles (n = 3-6) can be synthesized using palladium-catalyzed asymmetric allylic alkylation followed by rutheniumcatalyzed cycloisomerization. New types of triarylphosphino-1,2-diaminooxazoline ligands show the same high levels of enantioselectivity observed with Trost ligand when employed in Pd-catalyzed allylic alkylation reactions. The enyne products of these allylic alkylation reactions were further elaborated using a Ru-catalyzed redox isomerization process, for which a mechanism is proposed.
Evaluation Of Carbonic Anhydrase And Paraoxonase Inhibition Activities And Molecular Docking Studies Of Highly Water-Soluble Sulfonated Phthalocyanines, Emre Güzel, Fati̇h Sönmez, Sultan Erkan, Kübra Çikrikci, Adem Ergün, Nahi̇t Gençer, Oktay Arslan, Makbule Koçak
Evaluation Of Carbonic Anhydrase And Paraoxonase Inhibition Activities And Molecular Docking Studies Of Highly Water-Soluble Sulfonated Phthalocyanines, Emre Güzel, Fati̇h Sönmez, Sultan Erkan, Kübra Çikrikci, Adem Ergün, Nahi̇t Gençer, Oktay Arslan, Makbule Koçak
Turkish Journal of Chemistry
The investigation of carbonic anhydrase and paraoxonase enzyme inhibition properties of water-soluble zinc and gallium phthalocyanine complexes (1 and 2) are reported for the first time. The binding of p-sulfonylphenoxy moieties to the phthalocyanine structure favors excellent solubilities in water, as well as providing an inhibition effect on carbonic anhydrase (CA) I and II isoenzymes and paraoxonase (PON1) enzyme. According to biological activity results, both complexes inhibited hCA I, hCA II, and PON1. Whereas 1 and 2 showed moderate hCA I and hCA II (off-target cytosolic isoforms) inhibitory activity (Ki values of 26.09 μM and 43.11 μM for hCA I …
Catalytic Activity Of Novel Thermoplastic/Cellulose-Au Nanocomposites Prepared By Cryomilling, Joanna Kwiczak Yigitbasi
Catalytic Activity Of Novel Thermoplastic/Cellulose-Au Nanocomposites Prepared By Cryomilling, Joanna Kwiczak Yigitbasi
Turkish Journal of Chemistry
Due to environmental concerns, increasing attention has been focused on the application and preparation of biobased polymers and their blends. In this study, cellulose, the most spread biopolymer on Earth, was used in the preparation of novel cotton/polypropylene- Au and cotton/polyethylene-Au nanocomposites via a green mechanochemical approach. First, mechanoradicals were generated by ball milling of the cotton and thermoplastics under cryo conditions, and then, these radicals were used in the reduction of Au ions to Au nanoparticles (Au NPs). Nanocomposites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The application of mechanochemistry in …
Effect Of Ph On Lipid Oxidation Of Red Onion Skin Extracts Treated With Washed Tilapia (Oreochromis Niloticus) Muscle Model Systems, Senem Güner, Yavuz Yağiz, Zeynal Topalcengi̇z, Hordur G. Kristinsson, George Baker, Paul Sarnoski, Bruce A. Welt, Amarat Simonne, Maurice M. Marshall
Effect Of Ph On Lipid Oxidation Of Red Onion Skin Extracts Treated With Washed Tilapia (Oreochromis Niloticus) Muscle Model Systems, Senem Güner, Yavuz Yağiz, Zeynal Topalcengi̇z, Hordur G. Kristinsson, George Baker, Paul Sarnoski, Bruce A. Welt, Amarat Simonne, Maurice M. Marshall
Turkish Journal of Chemistry
The aim of the study was to investigate the effect of pH on the lipid oxidation of red onion skin extracts (ROSEs) treated with washed tilapia muscle model systems (WTMS). Minced and buffered washed samples were prepared at pH 6.3 and 6.8. The WTMS were treated with2 different concentrations of red onion skin prior to storage for 5 days. Lipid oxidation was investigated via peroxide values (PVs), thiobarbituric acid reactive substances (TBARS), and the formation of volatile compounds. Fatty acid profiles of the samples were also identified. The ROSEs were able to significantly suppress the PV (~71%) and TBARS (~42%) …