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Articles 541 - 570 of 2720
Full-Text Articles in Chemistry
Phytochemical Characterisation Of Phlomis Linearis Boiss. & Bal And Screening Foranticholinesterase, Antiamylase, Antimicrobial, And Cytotoxic Properties, Gamze Göger, Ümmühan Türkyolu, Ezgi̇ Nur Gürşen, Süleyman Yur, Abdullah Burak Karaduman, Fati̇h Göger, Mehmet Teki̇n, Gülmi̇ra Özek
Phytochemical Characterisation Of Phlomis Linearis Boiss. & Bal And Screening Foranticholinesterase, Antiamylase, Antimicrobial, And Cytotoxic Properties, Gamze Göger, Ümmühan Türkyolu, Ezgi̇ Nur Gürşen, Süleyman Yur, Abdullah Burak Karaduman, Fati̇h Göger, Mehmet Teki̇n, Gülmi̇ra Özek
Turkish Journal of Chemistry
In the present work, essential oil and fatty acids and extracts obtained from aerial parts of Phlomis linearis Boiss. & Bal. were investigated for chemical composition and biological activities. The phytochemical analyses were conducted with gas chromatographymass spectrometry/flame ionisation detector (GC-MS/FID) and liquid chromatography-mass spectromtetry (LC-MS/MS) techniques. The extracts and essential oil were studied for α-amylase and acetylcholinesterase activities with two different spectrophotometric methods. Antimicrobial activities of the extracts were investigated by microdilution. The extracts were evaluated in vitro for cytotoxic effects against cancer and normal cell lines by MTT assay. The essential oil (EO) contained α-pinene (12.5%) and β-caryophyllene …
Detection Of Alkanolamines In Liquid Cement Grinding Aids By Hplc Coupled Withevaporative Light Scattering Detector, Cheng Li, Wenfang Song, Yubai Shi, Zhiwei Qing
Detection Of Alkanolamines In Liquid Cement Grinding Aids By Hplc Coupled Withevaporative Light Scattering Detector, Cheng Li, Wenfang Song, Yubai Shi, Zhiwei Qing
Turkish Journal of Chemistry
Triethanolamine (TEA), triisopropanolamine (TIPA), diethanol isopropanolamine (DEIPA) are necessary cement additives, and knowing their contents is needed for quality control and also to understand final properties of the cement. Whether it is the production of grinding aids, technical research and development or application research all involve the detection of grinding aids. This work developed a simple analytical technique for the simultaneous analysis of these alkanolamines in liquid cement grinding aids using high-performance liquid chromatography (HPLC) combined with evaporative light scattering detection (ELSD). HPLC was conducted by an XBridge C18 column (with dimensions 4.6 × 250 mm and 5 ?m particles) …
Preparation Of Glutathione Loaded Nanoemulsions And Testing Of Hepatoprotectiveactivity On Thle-2 Cells, Ozan Yeşi̇ltepe, Emi̇ne Güler Çeli̇k, Caner Geyi̇k, Zi̇nar Pinar Gümüş, Di̇lek Odaci Demi̇rkol, Hakan Coşkunol, Suna Ti̇mur
Preparation Of Glutathione Loaded Nanoemulsions And Testing Of Hepatoprotectiveactivity On Thle-2 Cells, Ozan Yeşi̇ltepe, Emi̇ne Güler Çeli̇k, Caner Geyi̇k, Zi̇nar Pinar Gümüş, Di̇lek Odaci Demi̇rkol, Hakan Coşkunol, Suna Ti̇mur
Turkish Journal of Chemistry
To improve bioavailability and stability of hydrophobic and hydrophilic compounds, nanoemulsions are good alternatives as delivery systems because of their nontoxic and nonirritant nature. Glutathione (GSH) suffers from low stability in water, where its encapsulation in nanoemulsions is a powerful strategy to its stability in aqueous systems. The aim of this study was to obtain nanoemulsions from the hydrophobic/hydrophilic contents of N. sativa seed oil so as to improve GSH stability along with bioavailability of N. sativa seed oil. Then, the prepared nanoemulsions were tested for in vitro hepatoprotective activity against ethanol toxicity. To the best of our knowledge, there …
Synthesis And Biological Evaluation Of New Pyrazolebenzene-Sulphonamides As Potentialanticancer Agents And Hca I And Ii Inhibitors, Mehtap Tuğrak, Hali̇se İnci̇ Gül, Hi̇roshi̇ Sakagami̇, Rüya Kaya, İlhami̇ Gülçi̇n
Synthesis And Biological Evaluation Of New Pyrazolebenzene-Sulphonamides As Potentialanticancer Agents And Hca I And Ii Inhibitors, Mehtap Tuğrak, Hali̇se İnci̇ Gül, Hi̇roshi̇ Sakagami̇, Rüya Kaya, İlhami̇ Gülçi̇n
Turkish Journal of Chemistry
Cancer is a disease characterized by the continuous growth of cells without adherence to the rules that healthy normal cells obey. Carbonic anhydrase I and II (CA I and CA II) inhibitors are used for the treatment of some diseases. The available drugs in the market have limitations or side effects, which bring about the need to develop new drug candidate compound(s) to overcome the problems at issue. In this study, new pyrazole-sulphonamide hybrid compounds 4-[5-(1,3-benzodioxol-5-yl)-3-aryl-4,5-dihydro-1Hpyrazol- 1-yl]benzenesulphonamides (4a - 4j) were designed to discover new drug candidate compounds. The compounds 4a - 4j were synthesized and their chemical structures were …
Synthesis And Characterization Of Biodegradable Palm Palmitic Acid Based Bioplastic, Abd Al-Wali Japir, Nadia Salih, Jumat Salimon
Synthesis And Characterization Of Biodegradable Palm Palmitic Acid Based Bioplastic, Abd Al-Wali Japir, Nadia Salih, Jumat Salimon
Turkish Journal of Chemistry
This study involves the quantitative analysis of high free fatty acid crude palm oil, the separation of palmitic acid and synthesis of palm palmitic acid-based bioplastic. Synthesis of dimethyl 2-tetradecylmalonate (DMTDM) using methyl palmitate (MP) with sodium hydride (NaH) in the presence of reactive solvent of dimethyl carbonate (DMC) was carried out. The reaction conditions comprise at a mole ratio of MP: DMC: NaH: dimethylformamide (DMF) (0.1:2:0.25:1) at 60 °C for 14 h with 88.3 ± 1.4% yield. FTIR spectra of DMTDM showed the ester carbonyl group at 1740 cm-1. The polymerization of DMTDM with 1,6-hexandiol or 1,12-dodecandiol was carried …
3-Hydroxy-7,8,9,10-Tetrahydro-6h-Benzo[C]Chromen-6-One And 3-Hydroxy-6h-Benzo[C] Chromen-6-One Act As On-Off Selective Fluorescent Sensors For Iron (Iii) Under In Vitro And Ex Vivo Conditions, Karar Shukur, Amirhossein Fallah, Kerem Terali, Rasi̇me Kalkan, Mustafa Gazi, Hayretti̇n Ozan Gülcan
3-Hydroxy-7,8,9,10-Tetrahydro-6h-Benzo[C]Chromen-6-One And 3-Hydroxy-6h-Benzo[C] Chromen-6-One Act As On-Off Selective Fluorescent Sensors For Iron (Iii) Under In Vitro And Ex Vivo Conditions, Karar Shukur, Amirhossein Fallah, Kerem Terali, Rasi̇me Kalkan, Mustafa Gazi, Hayretti̇n Ozan Gülcan
Turkish Journal of Chemistry
Regarding the abundant use of metals for different purposes, it becomes more critical from various scientific and technologi¬cal perspectives to discover novel agents as selective probes for the detection of specific metals. In our previous studies, we have shown that aqueous solutions of natural urolithins (i.e., hydroxyl-substituted benzo[c]chromen-6-one derivatives) are selective Iron (III) sen¬sors in fluorescence assays. In this study, we have extrapolated these findings to another coumarine compound (i.e., 3-Hydroxy-7,8,9,10- tetrahydro-6H-benzo[c]chromen-6-one) and compared the selective metal binding properties with Urolithin B (i.e., 3-Hydroxy-6H-benzo[c]chromen-6-one). Following the synthesis and structure identification studies, the fluorometric studies pointed out that the lactam group …
Sensitive And Selective Determination Of Imidacloprid With Magnetic Molecularly Imprinted Polymer By Using Lc/Q-Tof/Ms, Rai̇f İlktaç, Zi̇nar Pinar Gümüş
Sensitive And Selective Determination Of Imidacloprid With Magnetic Molecularly Imprinted Polymer By Using Lc/Q-Tof/Ms, Rai̇f İlktaç, Zi̇nar Pinar Gümüş
Turkish Journal of Chemistry
In this paper, magnetic-molecularly imprinted polymer was used for the preconcentration of trace levels of imidacloprid in water and apple samples prior to liquid chromatography-quadrupole-time-of-flight mass spectrometric determination. The selectivity of the magnetic polymer was united with the sensitivity and the high resolving power of the chromatographic system. The developed method showed a linear range from 10.0 to 500.0 μg/L. The quantitative recoveries were obtained for water and apple samples in the range of 92.0%-99.0 %. The relative standard deviations of intra-day and inter-day tests were found to be in the range of 0.8%-1.2% and 1.2%-1.6 %, respectively. In addition, …
Surface And Chemical Characteristics Of Platinum Modified Activated Carbon Electrodesand Their Electrochemical Performance, Tuğrul Yumak, Serap Yumak, Abdulkeri̇m Karabulut
Surface And Chemical Characteristics Of Platinum Modified Activated Carbon Electrodesand Their Electrochemical Performance, Tuğrul Yumak, Serap Yumak, Abdulkeri̇m Karabulut
Turkish Journal of Chemistry
Platinum (Pt) loaded activated carbons (ACs) were synthesized by the thermal decomposition of platinum (II) acetylacetonate (Pt(acac)2) over chemically activated glucose-based biochar. The effect of Pt loading on surface area, pore characteristics, surface chemistry, chemical structure, and surface morphology were determined by various techniques. XPS studies proved the presence of metallic Pt0 on the AC surface. The graphitization degree of Pt loaded ACs were increased with the loaded Pt0 amount. The electrochemical performance of the Pt-loaded ACs (Pt@AC) was determined not only by the conventional three-electrode system but also by packaged supercapacitors in CR2032 casings. The capacitive performance of Pt@AC …
One-Pot Synthesis Of Graphene Hydrogel-Anchored Cobalt-Copper Nanoparticles And Their Catalysis In Hydrogen Generation From Ammonia Borane, Ibtihel Zaier, Önder Meti̇n
One-Pot Synthesis Of Graphene Hydrogel-Anchored Cobalt-Copper Nanoparticles And Their Catalysis In Hydrogen Generation From Ammonia Borane, Ibtihel Zaier, Önder Meti̇n
Turkish Journal of Chemistry
We reported a facile one-pot synthesis of bimetallic CoCu nanoparticles (NPs) anchored on graphene hydrogel (GH-CoCu) as catalysts in hydrogen generation from the hydrolysis of ammonia borane (HAB). The presented novel one-pot method composed of the reduction of the mixture of graphene oxide, cobalt(II), and copper(II) acetate tetrahydrates by aqueous ethylene glycol solution in a teflon-coated stainless-steel reactor at 180 °C. The structure of the yielded GH-CoCu nanocatalysts was characterized by TEM, SEM, XRD, XPS, and ICP-MS. This is the first example of both the synthesis of bimetallic CoCu NPs anchored on GH and the testing of a hydrothermally prepared …
Volatile Constituents Of Three Thymus Sipyleus Boiss. Subspecies From Different Sites In Turkey, Hale Gamze Ağalar, Mi̇ne Kürkçüoğlu, Kemal Hüsnü Can Başer, Kenan Turgut
Volatile Constituents Of Three Thymus Sipyleus Boiss. Subspecies From Different Sites In Turkey, Hale Gamze Ağalar, Mi̇ne Kürkçüoğlu, Kemal Hüsnü Can Başer, Kenan Turgut
Turkish Journal of Chemistry
This study was designed to reveal the chemical diversity of some Thymus sipyleus subspecies growing wild in Turkey and to compare the volatile compound profiles by using micro(hydro)distillation technique. For this purpose, volatile compounds isolated by microdistillation from nine samples (three plant samples collected from different regions in Antalya) of Thymus sipyleus Boiss. subsp. sipyleus var. sipyleus, T. sipyleus Boiss. subsp. sipyleus var. davisianus Ronniger, and T. sipyleus Boiss. subsp. rosulans (Borbas) Jalas were analyzed by GC and GC-MS systems. 1,8-Cineole, p-cymene, α-terpineol and carvacrol were identified as major compounds in T. sipyleus subsp. sipyleus var. sipyleus samples. Geranial, neral, …
In-Situ Synthesis Of Phthalocyanines On Electrospun Tio2 Nanofiber By Solvothermal Process For Photocatalytic Degradation Of Methylene Blue, Seli̇n Gümrükçü, Mukaddes Özçeşmeci̇, Esma Sezer, Belkiz Ustamehmetoğlu, Esi̇n Hamuryudan
In-Situ Synthesis Of Phthalocyanines On Electrospun Tio2 Nanofiber By Solvothermal Process For Photocatalytic Degradation Of Methylene Blue, Seli̇n Gümrükçü, Mukaddes Özçeşmeci̇, Esma Sezer, Belkiz Ustamehmetoğlu, Esi̇n Hamuryudan
Turkish Journal of Chemistry
Titanium dioxide/phthalocyanine (TiO2/Pc), TiO2/fluor containing phthalocyanine (TiO2/FPc), and TiO2/fluor containing cobalt phthalocyanine (TiO2/FCoPc) had been successfully fabricated by a simple combination of phthalocyanines obtained by in-situ synthesis on the surface of TiO2 nanofibers prepared by electrospinning. Scanning electron microscopy micrographs and X-ray diffraction analysis indicated that the phthalocyanines uniformly immobilized on the surface of TiO2 nanofibers. Photocatalytic activity of TiO2, TiO2/Pc, TiO2/FPc, TiO2/FCoPc nanofibers for methylene blue in water was comparatively investigated firstly by ultraviolet-visible absorption measurements with time, and kinetic parameters were calculated. Results indicated that the obtained TiO2/Pc, TiO2/FPc and TiO2/FCoPc exhibited high photocatalytic activity for the degradation …
Efficiency Enhancement With Chloride To Iodide Ion Exchange Of Benzimidazolium Salt Asa Redox Mediator, Serkan Dayan, Mert Olgun Karataş, Bülent Alici, Ni̇lgün Kalaycioğlu Özpozan
Efficiency Enhancement With Chloride To Iodide Ion Exchange Of Benzimidazolium Salt Asa Redox Mediator, Serkan Dayan, Mert Olgun Karataş, Bülent Alici, Ni̇lgün Kalaycioğlu Özpozan
Turkish Journal of Chemistry
The new benzimidazolium derivative (SM-1) salt with ion exchange from the (SM-0) was fabricated and characterized by protonnuclear magnetic resonance (1H-NMR), carbon-nuclear magnetic resonance (13C-NMR), Fourier-transform infrared spectroscopy (FTIR), electrospray ionization (EIS-MS), thermal analysis (TG), cyclic voltammetry (CV), and ultraviolet-visible spectroscopy (UV-vis), for electrolytes (liquid or dried) in the DSSC charge transportation mechanism. Also, the influence of ion exchange from chloride to iodine in the synthesized electrolytes, compared to other electrolytes (conventional or commercial), was investigated about DSSC performance efficiency. When using as a liquid electrolyte (SM-1), the power conversion efficiency (η) of the working DSSC device was recorded as …
Reusability And Regeneration Of Solid Catalysts Used In Ultrasound Assisted Biodieselproduction, Mahmut Rahi̇m Bayramoğlu, İbrahi̇m Korkut, Başak Temur Ergan
Reusability And Regeneration Of Solid Catalysts Used In Ultrasound Assisted Biodieselproduction, Mahmut Rahi̇m Bayramoğlu, İbrahi̇m Korkut, Başak Temur Ergan
Turkish Journal of Chemistry
Reusability of two heterogeneous catalysts in ultrasound (US) assisted biodiesel production was investigated in comparison to each other. An ultrasound (US) generator (200 W, 20 kHz) equipped with a horn type probe (19 mm) was used. Regeneration experiments were planned according to second order central composite design (CCD) method. After the eighth use of the catalysts, biodiesel yield decreased from 99.1% to 90.4% for calcined calcite (CaO) and from 98.8% to 89.8% for calcined dolomite (CaO.MgO). Furthermore, regeneration of spent catalysts by calcination was investigated; optimum temperature and time were found as 750 °C and 90 min, lower than fresh …
Tin-Sulfur Based Catalysts For Acetylene Hydrochlorination, Yibo Wu, Fuxiang Li, Xiaoqiang Luo, Gang Tian, Yunxiao Feng, Yongjun Han, Li Wang, Songmao Chu, Yunli Cao, Kesheng Cao, Xiaoming Hu, Xuejun Shi, Songtian Li, Guoxv He, Qingbin Li
Tin-Sulfur Based Catalysts For Acetylene Hydrochlorination, Yibo Wu, Fuxiang Li, Xiaoqiang Luo, Gang Tian, Yunxiao Feng, Yongjun Han, Li Wang, Songmao Chu, Yunli Cao, Kesheng Cao, Xiaoming Hu, Xuejun Shi, Songtian Li, Guoxv He, Qingbin Li
Turkish Journal of Chemistry
In the present work, tin-sulfur based catalysts were prepared using Na2SO3 and (CH3SO3)2Sn and were tested in acetylene hydrochlorination. Based on the analysis of experiments results, the acetylene conversion of (CH3SO3)2Sn/S@AC is still over 90% after a 50 h reaction, at the reaction conditions of T = 200 oC, VHCl/VC2H2 = 1.1:1.0 and C2H2-GSHV = 15 h-1. According to the results of X-ray photoelectron spectroscopy (XPS), HCl adsorption experiments, and acetylene temperature programmed desorption (C2H2-TPD), it is reasonable to conclude that the interaction between Sn and S not only can retard the oxidation of Sn2+ in catalysts but also strengthen …
Investigation Of Performances Of Commercial Diesel Oxidation Catalysts For Co, C3h6, And No Oxidation, Hande Güneş, Deni̇z Şanli Yildiz, Hüseyi̇n Barkin Özener, Gökhan Hi̇sar, Selmi̇ Eri̇m Bozbağ, Can Erkey
Investigation Of Performances Of Commercial Diesel Oxidation Catalysts For Co, C3h6, And No Oxidation, Hande Güneş, Deni̇z Şanli Yildiz, Hüseyi̇n Barkin Özener, Gökhan Hi̇sar, Selmi̇ Eri̇m Bozbağ, Can Erkey
Turkish Journal of Chemistry
Four commercial monolithic diesel oxidation catalysts (DOCs) with two different platinum group metal (PGM) loadings and Pt:Pd ratios of 1:0, 2:1, 3:1 (w/w) were investigated systematically for CO, C3H6, and NO oxidation, CO-C3H6 co-oxidation, and CO-C3H6-NO oxidation reactions via transient activity measurements in a simulated diesel engine exhaust environment. As PGM loading increased, light-off curves shifted to lower temperatures for individual and co-oxidation reactions of CO and C3H6. CO and C3H6 were observed to inhibit the oxidation of themselves and each other. Addition of Pd to Pt was found to enhance CO and C3H6 oxidation performance of the catalysts while …
Synthesis And Molecular Docking Study Of Novel Covid-19 Inhibitors, Zuhal Gerçek, Deni̇z Ceyhan, Erol Erçağ
Synthesis And Molecular Docking Study Of Novel Covid-19 Inhibitors, Zuhal Gerçek, Deni̇z Ceyhan, Erol Erçağ
Turkish Journal of Chemistry
In 2020, the world tried to combat the corona virus (COVID-19) pandemic. A proven treatment method specific to Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) is still not found. In this study, seven new antiviral compounds were designed for COVID-19 treatment. The ability of these compounds to inhibit COVID-19's RNA processing was calculated by the molecular docking study. It has been observed that the compounds can have high binding affinities especially against NSP12 (between -9.06 and -8.00 kcal/mol). The molecular dynamics simulation of NSP12-ZG 7 complex proved the stability of interaction. The synthesis of two most active molecules was performed by …
Thermal Stresses In Sofc Stacks: The Role Of Mismatch Among Thermalconductivity Of Adjacent Components, Özgür Aydin, Go Matsumoto, Yusuke Shiratori
Thermal Stresses In Sofc Stacks: The Role Of Mismatch Among Thermalconductivity Of Adjacent Components, Özgür Aydin, Go Matsumoto, Yusuke Shiratori
Turkish Journal of Chemistry
Generating power from renewable biogas in solid oxide fuel cells (SOFCs) is an environment-friendly, efficient, and promising energy conversion process. Biogas can be used in SOFCs via a reforming process for which dry reforming is more suitable as the reforming agent exists in the biogas mixture. Biogas can be directly reformed to H2 -rich fuel stream in the anode chamber of a SOFC by the heat released during power generation. Exploiting the heat and water produced in the SOFC for internal reforming of biogas makes the energy conversion process very efficient; however, various challenges are reported. Thus, indirect internal reforming …
Synthesis Of Hydroxy Benzoin/Benzil Analogs And Investigation Of Their Antioxidant,Antimicrobial, Enzyme Inhibition, And Cytotoxic Activities, Nuretti̇n Yayli, Gözde Kiliç, Gonca Çeli̇k, Nuran Kahri̇man, Şeyda Kanbolat, Ari̇f Bozdeveci̇, Şengül Alpay Karaoğlu, Rezzan Ali̇yazicioğlu, Hasan Erdi̇nç Selli̇tepe, İnci̇ Seli̇n Doğan, Ali̇ Aydin
Synthesis Of Hydroxy Benzoin/Benzil Analogs And Investigation Of Their Antioxidant,Antimicrobial, Enzyme Inhibition, And Cytotoxic Activities, Nuretti̇n Yayli, Gözde Kiliç, Gonca Çeli̇k, Nuran Kahri̇man, Şeyda Kanbolat, Ari̇f Bozdeveci̇, Şengül Alpay Karaoğlu, Rezzan Ali̇yazicioğlu, Hasan Erdi̇nç Selli̇tepe, İnci̇ Seli̇n Doğan, Ali̇ Aydin
Turkish Journal of Chemistry
In this study, hydroxy benzoin (1-7), benzil (8-14), and benzoin/benzil-O-β-D-glucosides (15-25) were synthesized to investigate their biological activities. An efficient method for synthesizing hydroxy benzoin compounds (1-7) was prepared from four different benzaldehydes using an ultrasonic bath. Then, antioxidant (FRAP, CUPRAC, and DPPH), antimicrobial (3 Gram (-), 4/6 Gram (+), one tuberculosis and one fungus), and enzyme inhibition (acetylcholinesterase, butyrylcholine esterase, tyrosinase, α-amylase, and α- glucosidase) for the all synthesized compounds (1-25) were evaluated. And also, four most active compounds (4, 12, 18a+b, and 25) from each group were evaluated to the human cervical cancer cell line (HeLa) and anticancer …
Synthesis And Antioxidant Activities Of New Nickel(Ii) Complexes Derived From 4-Benzy¬Loxysalicylidene-S-Methyl/Propyl Thiosemicarbazones, Songül Eğlence Bakir
Synthesis And Antioxidant Activities Of New Nickel(Ii) Complexes Derived From 4-Benzy¬Loxysalicylidene-S-Methyl/Propyl Thiosemicarbazones, Songül Eğlence Bakir
Turkish Journal of Chemistry
Six nickel(II) complexes of the N2O2 chelating thiosemicarbazones were synthesized using N1-4-benzyloxysalicylidene-S-methyl/propyl thiosemicarbazone and methoxy-substitute-salicylaldehydes in the presence of Ni(II) ion by template reaction. The structures of thiosemicarbazones and nickel(II) complexes were characterized by elemental analysis, UV-Vis, IR, and 1H-NMR spec¬troscopies. The structure of the N1-4-benzyloxysalicylidene-S-propyl thiosemicarbazone (2) was determined by X-ray single-crystal diffraction method. The total antioxidant capacities of synthesized compounds were evaluated by using cupric reducing antioxidant capacity (CUPRAC) method. The thiosemicarbazones exhibited more potent antioxidant capacity than Ni(II) complexes. Trolox equiv¬alent antioxidant capacity (TEAC) of 1c was found highest in tested nickel(II) complexes. In addition, antioxidant activities …
Synthesis, Spectroscopic, Thermal, Crystal Structure Properties, And Characterization Of New Hofmann-Td-Type Complexes With 3-Aminopyridine, Zeki̇ Kartal, Onur Şahi̇n
Synthesis, Spectroscopic, Thermal, Crystal Structure Properties, And Characterization Of New Hofmann-Td-Type Complexes With 3-Aminopyridine, Zeki̇ Kartal, Onur Şahi̇n
Turkish Journal of Chemistry
In this study, synthesis of two new tetracyanocadmate(II) and tetracyanozincate(II) complexes based on 3-aminopyridine (3AP) and investigation of their structural properties were reported. These complexes were characterized by using vibration spectroscopy, elemental, thermal analysis and single crystal X-ray diffraction (SC-XRD) techniques. Investigation of the elemental, spectral and single crystal data of these complexes showed that the formulas [Cd(3AP)2Zn(μ4-CN)4]n (1) and [Cd(3AP) 2Cd(μ4-CN)4]n (2) fully explained their crystal structure. General information about the structural and chemical properties of these complexes obtained in single crystal form was obtained by observing the changes in the characteristic peaks of the 3AP with the [Zn(μ4-CN)4]2- …
Novel Mixed Ligand Coordination Compounds Of Some Rare Earth Metal Cations Containing Acesulfamato/N,N-Diethylnicotinamide, Leri̇man Zeybel, Dursun Ali̇ Köse
Novel Mixed Ligand Coordination Compounds Of Some Rare Earth Metal Cations Containing Acesulfamato/N,N-Diethylnicotinamide, Leri̇man Zeybel, Dursun Ali̇ Köse
Turkish Journal of Chemistry
The mixed ligand coordination compounds containing acesulfamato and N,N-diethylnicotinamide biomolecules of some rare earth metal cations (Eu3+, Tb3+, Ho3+, Er3+ and Yb3+) were synthesized, and their structural properties were investigated. Possible structural formulas have been proposed by determining the chemical composition of molecules (elemental analysis), binding properties (infrared spectroscopy, mass analysis, solid-state UV-vis spectroscopy), thermal degradation properties (TGA / DTA curves). Based on the data collected, it is suggested that rare earth metal cations with a 3+ oxidation state have sextet coordination. The geometries of the structures were thought to be distorted octahedral. The charge balance of the coordination sphere …
Binding Of Permanganate Anion To Pentaammineazidocobalt(Iii) Cation In Solution And Solid Phases: Synthesis, Characterization, X-Ray Structure, And Genotoxic Effects Of [Co(Nh3)5n3](Mno4)2•H2o, Ritu Bala, Jinkwon Kim, Vinit Prakash
Binding Of Permanganate Anion To Pentaammineazidocobalt(Iii) Cation In Solution And Solid Phases: Synthesis, Characterization, X-Ray Structure, And Genotoxic Effects Of [Co(Nh3)5n3](Mno4)2•H2o, Ritu Bala, Jinkwon Kim, Vinit Prakash
Turkish Journal of Chemistry
A pentaammineazidocobalt(III) complex, [Co(NH3)5N3](MnO4)2XH2O has been synthesized by an one-pot synthesis method. It was characterized by studies such as infrared (IR) and UV-visible spectroscopy. The single crystal X-ray structure analysis revealed that the title complex crystallizes in space group Cc. The cobalt center is six coordinated with slightly octahedral geometry. The supramolecular architecture is also formed by intermolecular N-H…O (anion and H2O) and Mn-O…O-H hydrogen bonds. The binding property of the cation, [Co(NH3)5N3]2+ with the anion, MnO4- has also been determined (in solution phase) with the help of UV-visible spectroscopic titrations. Further, the genotoxic effects of KMnO4, [Co(NH3)5N3]Cl2 and [Co(NH3)5N3](MnO4)2XH2O …
Evaluation Of Quercetin As A Potential Β-Lactamase Ctx-M-15 Inhibitor Via The Molecular Docking, Dynamics Simulations, And Mmgbsa, Emrah Sariyer, Ayşegül Saral
Evaluation Of Quercetin As A Potential Β-Lactamase Ctx-M-15 Inhibitor Via The Molecular Docking, Dynamics Simulations, And Mmgbsa, Emrah Sariyer, Ayşegül Saral
Turkish Journal of Chemistry
Antimicrobial resistance (AMR) threatens millions of people around the world and has been declared a global risk by the World Economic Forum. One of the important AMR mechanisms in Enterobacteriaceae is the production of extended-spectrum β-lactamases. The most common ESBL, CTX-M β-lactamases, is spread to the world by CTX-M-15 and CTX-M-14. Sulbactam, clavu-lanic acid, and tazobactam are first-generation β-lactamase inhibitors and avibactam is a new non-β-lactam β-lactamase inhibitor. We studied that avibactam, sulbactam, clavulanic acid, tazobactam, and quercetin natural flavonoids were docked to target protein CTX-M-15. Subsequently, the complexes were simulated using the molecular dynamics simulations method during 100 ns …
Impact Of Graphitic Carbon Nitrides Synthesized From Different Precursors On Schottky Junction Characteristics, Orhan Altan
Impact Of Graphitic Carbon Nitrides Synthesized From Different Precursors On Schottky Junction Characteristics, Orhan Altan
Turkish Journal of Chemistry
Graphitic carbon nitride (g-CN) has gained wide interest in many areas, such as energy and the environmental remediation as a layered polymeric semiconductor that allows the formation of catalytically active Schottky junctions due to its proper electronic band structure. Interestingly, although it is known that the precursors used in the synthesis, can influence the properties of the g-CN, no detailed study on these effects on Schottky junctions could be found in the literature. In this research, the effects of g-CNs synthesized by thermal polycondensation of different precursors on the photocatalytic efficiency of Schottky junctions were investigated. For this purpose, urea, …
Fabrication And Characterization Of Enhanced Hydrazine Electrochemical Sensor Based On Gold Nanoparticles Decorated On The Vanadium Oxide, Ruthenium Oxide Nanomaterials, And Carbon Nanotubes Composites, Si̇bel Karaca, Süleyman Koçak
Fabrication And Characterization Of Enhanced Hydrazine Electrochemical Sensor Based On Gold Nanoparticles Decorated On The Vanadium Oxide, Ruthenium Oxide Nanomaterials, And Carbon Nanotubes Composites, Si̇bel Karaca, Süleyman Koçak
Turkish Journal of Chemistry
This work describes the synthesis of mixed oxide film of vanadium and ruthenium by pulsed deposition technique on multiwall carbon nanotubes and the decoration of gold nanoparticles on the mixed film. A ternary electrocatalyst has been developed for the electrochemical oxidation of hydrazine by combining two metal oxide mixtures with Au nanoparticles. Surface morphology and chemical composition of the electrode have been examined with SEM, EDX, HRTEM, EIS, and XRD. The peak current of hydrazine increased 9 times at the AuNPs/(VOx-RuOx)/CNT/GCE compared to the bare GCE, and the peak potential shifted to negative 848 mV. Linear sweep voltammetry (LSV) and …
Structural And Adsorption Behaviour Of Zno/Aminated Swcnt-Cooh For Malachite Green Removal: Face-Centred Central Composite Design, Zeynep Ci̇ğeroğlu
Structural And Adsorption Behaviour Of Zno/Aminated Swcnt-Cooh For Malachite Green Removal: Face-Centred Central Composite Design, Zeynep Ci̇ğeroğlu
Turkish Journal of Chemistry
In this study, an effective adsorbent was synthesized to remove malachite green (MG), which is one of the toxic dyes. Firstly, single walled carbon nanotube with carboxylated acid (SWCNT-COOH) was functionalized with diethylenetriamine and a new nanocomposite was obtained using nano zinc oxide (ZnO) powder. The effects of pH (3-7), the amount of adsorbent (5-15 mg) and the initial concentration (10-50 mg L-1) of the solution on the adsorption uptake were investigated. The optimal parameters that maximize the adsorption uptake according to the specified working range are found to be 4.63 for pH, 49.94 mg L-1 for initial concentration, 5.25 …
Preparation And Characterization Of Templated Porous Carbons From Sucrose By One-Pot Method And Application As A Co2 Adsorbent, Meltem Gürbüz, Fatma Tümsek
Preparation And Characterization Of Templated Porous Carbons From Sucrose By One-Pot Method And Application As A Co2 Adsorbent, Meltem Gürbüz, Fatma Tümsek
Turkish Journal of Chemistry
The templated porous carbons were prepared from sucrose by one-pot method. In this method in which the pre-synthesis of the hard template is eliminated, the porous carbons were produced by organic-inorganic self-assembly of sucrose, tetraethyl ortosilicate (TEOS), Pluronic P123 and n-butanol in an acidic medium, and subsequent carbonization. The synthesis parameters such as sucrose amount, TEOS molar ratio and carbonization temperature were evaluated for describing their effects on the pore structures of the synthesized carbons. The prepared porous carbons were characterized by N2 adsorption, thermogravimetric analysis (TGA), Raman spectroscopy, X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission …
Catalytic, Theoretical, And Biological Investigation Of An Enzyme Mimic Model, Gülci̇han Gülseren
Catalytic, Theoretical, And Biological Investigation Of An Enzyme Mimic Model, Gülci̇han Gülseren
Turkish Journal of Chemistry
Artificial catalyst studies were always stayed at the kinetics investigation level, in this work bioactivity of designed catalyst were shown by the induction of biomineralization of the cells, indicating the possible use of enzyme mimics for biological applications. The development of artificial enzymes is a continuous quest for the development of tailored catalysts with improved activity and stability. Understanding the catalytic mechanism is a replaceable step for catalytic studies and artificial enzyme mimics provide an alternative way for catalysis and a better understanding of catalytic pathways at the same time. Here we designed an artificial catalyst model by decorating peptide …
Low Loaded Pt-Co Catalyst Surfaces Optimized By Magnetron Sputtering Sequentialdeposition Technique For Pem Fuel Cell Applications: Physical And Electrochemicalanalysis On Carbon Paper Support, Osman Öztürk, Aydin Haşi̇moğlu, Oğuz Kaan Özdemi̇r, İnci̇ Karaaslan, Ali̇ Şems Ahsen
Low Loaded Pt-Co Catalyst Surfaces Optimized By Magnetron Sputtering Sequentialdeposition Technique For Pem Fuel Cell Applications: Physical And Electrochemicalanalysis On Carbon Paper Support, Osman Öztürk, Aydin Haşi̇moğlu, Oğuz Kaan Özdemi̇r, İnci̇ Karaaslan, Ali̇ Şems Ahsen
Turkish Journal of Chemistry
A series of thin Pt-Co films with different metal ratios were deposited by using the sequential cosputtering directly on a commercial hydrophobic carbon paper substrate at room temperature and in ultra-high vacuum (UHV) conditions. Their electrocatalytic properties toward the oxygen reduction reaction were investigated in 0.5 M H2SO4 solution by means of cyclic voltammetry (CV) and linear sweep voltammetry (LSV) on rotating disc electrode (RDE). The results showed that Pt particles, deposited by dc-magnetron gun, surround the large Co-clusters deposited by rf-magnetron gun. In addition, the increase of Co content led to an increase in the electrochemical active surface area …
N Doping Of Tio2 Nanocrystal For Efficient Photodegradation Of Organic Pollutants Underultraviolet And Visible Light Irradiation, Xiaoyou Yu, Qianrui Lv
N Doping Of Tio2 Nanocrystal For Efficient Photodegradation Of Organic Pollutants Underultraviolet And Visible Light Irradiation, Xiaoyou Yu, Qianrui Lv
Turkish Journal of Chemistry
To decrease the band gap of TiO2 and enhance its photocatalytic performance, in this work, N-doped nanocrystalline TiO2 is synthesized successfully through a simple sol-gel synthesis process with dicyandiamide used as N source. The N-doped TiO2 photocatalysts have been characterized in detail by means of powder X-ray diffraction, Raman spectroscopy, infrared spectroscopy, UV-vis spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscope. The photocatalytic activities of N-doped TiO2 to different organic pollutants are significantly different. Using 2 × 10-5 mol/L methylene blue as the target pollutant, N-doped TiO2 can produced approximately 100% conversion within 40 min, the photocatalytic degradation ability of …