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Articles 661 - 690 of 2720
Full-Text Articles in Chemistry
Synthesis And Spectroscopic Properties Of (N/O) Mono- Anddispirocyclotriphosphazene Derivatives With Benzyl Pendant Arms: Study Ofbiological Activity?, Özlem İşcan, Reşi̇t Cemaloğlu, Nuran Asmafi̇li̇z, Zeynel Kiliç, Leyla Açik, Peli̇n Özbeden, Tuncer Hökelek
Synthesis And Spectroscopic Properties Of (N/O) Mono- Anddispirocyclotriphosphazene Derivatives With Benzyl Pendant Arms: Study Ofbiological Activity?, Özlem İşcan, Reşi̇t Cemaloğlu, Nuran Asmafi̇li̇z, Zeynel Kiliç, Leyla Açik, Peli̇n Özbeden, Tuncer Hökelek
Turkish Journal of Chemistry
The Cl replacement reactions of hexachlorocyclotriphosphazene (trimer; N3 P3 Cl6) with sodium (N-benzyl)- aminopropanoxides (1 and 2) produced monospiro- (3 and 4), cis-, and trans-dispirocyclotriphosphazenes (13-16). The monospiro tetrakis-aminocyclotriphosphazenes (5-12) were obtained by the Cl substitutions of 3 and 4 with different secondary amines. The cis- (13 and 14) and trans-dispirophosphazenes (15 and 16) possessed 2 chiral P centers, and they were able to present meso and racemic forms, respectively. Moreover, the structures of compounds 5 and 14 were designated using X-ray data. The absolute configuration of compound 14 was found as SR in the solid state. Analytical and spectroscopic …
Synthesis, Optical, And Structural Properties Of Bisphenol-Bridgedaromatic Cyclic Phosphazenes, Bünyemi̇n Çoşut, Burcu Topaloğlu Aksoy, Süreyya Oğuz Tümay, Ahmet Şenocak, Serkan Yeşi̇lot
Synthesis, Optical, And Structural Properties Of Bisphenol-Bridgedaromatic Cyclic Phosphazenes, Bünyemi̇n Çoşut, Burcu Topaloğlu Aksoy, Süreyya Oğuz Tümay, Ahmet Şenocak, Serkan Yeşi̇lot
Turkish Journal of Chemistry
Phenoxy- and naphthoxy-substituted bisphenol-bridged cyclic phosphazenes were synthesized in 2 steps and their thermal, photophysical, and electrochemical properties were investigated. The structures of the cyclic phosphazene compounds were determined by ESI-MS mass spectrometry and $^{1}$H, $^{13}$C, and $^{31}$P NMR spectroscopies. The photophysical studies of phenoxy- and naphthoxy-substituted bridged cyclophosphazenes were investigated by means of absorption and fluorescence spectroscopies in different solvents. Thermal and electrochemical properties of the target compounds were also studied. Furthermore, the excimer emissions through intramolecular interactions in solution and in solid state were investigated by fluorescence spectroscopy and the theoretical calculations were performed in detail using DFT.
Chemosensor Properties Of 7-Hydroxycoumarin Substituted Cyclotriphosphazenes?, Gönül Yeni̇lmez Çi̇ftçi̇, Sergen Yilmaz, Nagi̇han Bayik, Eli̇f Şenkuytu, Esra Nur Kaya, Mahmut Durmuş, Mustafa Bulut
Chemosensor Properties Of 7-Hydroxycoumarin Substituted Cyclotriphosphazenes?, Gönül Yeni̇lmez Çi̇ftçi̇, Sergen Yilmaz, Nagi̇han Bayik, Eli̇f Şenkuytu, Esra Nur Kaya, Mahmut Durmuş, Mustafa Bulut
Turkish Journal of Chemistry
The newly synthesized cyclotriphosphazene cored coumarin chemosensors 5, 6, and 7 were successfully characterized by $^{1}$H NMR, $^{31}$P NMR, and MALDI-TOF mass spectrometry. Additionally, the photophysical and metal sensing properties of the targeted compounds were determined by fluorescence spectroscopy in the presence of various metals (Li$^{+}$, Na$^{+}$ , K$^{+}$ , Cs$^{+}$ , Mg2$^{+}$ , Ca2$^{+}$ , Ba2$^{+}$ , Cr3$^{+}$ , Mn2$^{+}$ , Fe3$^{+}$ , Co2$^{+}$ , Al3$^{+}$ , Hg$^{+}$ , Cu2$^{+}$ , Zn2$^{+}$ , Ag$^{+}$ , and Cd2$^{+}$) . The fluorescence titration results showed that compounds 5, 6, and 7 could be employed as fluorescent chemosensors for Fe3$^{+}$ ions with …
Novel Bodipy-Bridged Cyclotriphosphazenes, Hande Eserci̇, Ezel Öztürk, Eli̇f Okutan
Novel Bodipy-Bridged Cyclotriphosphazenes, Hande Eserci̇, Ezel Öztürk, Eli̇f Okutan
Turkish Journal of Chemistry
Three new 2-component unsubstituted (4P), diiodo- (5P), and dibromo- (6P) distyryl-BODIPY-bridged cyclotriphosphazene dimers were designed and synthesized. The newly synthesized BODIPY-cyclotriphosphazene systems were characterized by $^{1}$H, $^{13}$C, and $^{31}$P NMR spectroscopy. The photophysical properties of the distryl-BODIPYs (4-6) and BODIPY-cyclotriphosphazene dyads (4P-6P) were studied by UV-Vis absorption and fluorescence emission spectroscopy. In these derivatives, the bino-type cyclotriphosphazene derivative bearing unsubstituted BODIPY unit 4 P exhibited high fluorescence and no singlet oxygen generation due to the lack of spin converter. The attachment of heavy atoms (iodine and bromine) enabled the production of singlet oxygen. The bino-type BODIPY-cyclotriphosphazenes (5P and 6P) were …
One-Pot Synthesis Of Vox /Al2 O3 As Efficient Catalysts For Propanedehydrogenation, Guangjian Wang, Hao Xu, Kai Lu, Zhihao Ding, Liancheng Bing
One-Pot Synthesis Of Vox /Al2 O3 As Efficient Catalysts For Propanedehydrogenation, Guangjian Wang, Hao Xu, Kai Lu, Zhihao Ding, Liancheng Bing
Turkish Journal of Chemistry
Vanadium oxides, as highly efficiently catalysts, are widely applied in various catalytic reactions, such as the dehydrogenation of light alkanes and epoxidation of alkenes. In this paper, a series of VO$_{x}$ /Al$_{2}$O$_{3}$ catalysts were fabricated by the 1-pot method for catalytic propane dehydrogenation. The results indicated that the VO$_{x}$ /Al$_{2}$O$_{3}$ catalysts with loading of 10 wt.% vanadium exhibited optimized catalytic performance. The as-prepared catalysts were characterized by N$_{2}$ adsorption-desorption, XRD, TEM, H$_{2}$ -TPR, and XPS to explore the texture properties, morphology, and electronic environment of vanadium. In addition, several vanadium catalysts were also prepared by the incipient wetness impregnation (IWI) …
Entrapment Of Organic Fluorophores In Calcium Phosphate Nanoparticles Withslow Release, Laila Sadallah, Aicha Boukhriss, Hassan Hannache, Said Gmouh
Entrapment Of Organic Fluorophores In Calcium Phosphate Nanoparticles Withslow Release, Laila Sadallah, Aicha Boukhriss, Hassan Hannache, Said Gmouh
Turkish Journal of Chemistry
Two organic fluorophores, fluorescein (F) and rhodamine B (Rd), were entrapped in calcium phosphate nanoparticles. The as-obtained nanoparticles can be used for biological release applications. For this aim, calcium phosphate nanoparticles were synthesized using the precipitation method. Structural analysis of these nanoparticles was performed using XRD, FTIR, and Raman spectroscopy, confirming that the synthesized nanoparticles were hydroxyapatite. TEM and SEM analyses demonstrated that these nanoparticles had a size of 20 nm and a well-defined morphology. F and Rd (about 0.5 wt.%) were entrapped in these nanoparticles and their release, as a function of time, was studied via UV-Vis spectroscopy. The …
Ranolazine-Functionalized Cuo Nps: Efficient Homogeneous And Heterogeneouscatalysts For Reduction Of 4-Nitrophenol, Gul Naz Laghari Baloch, Sarfaraz Ahmed Mahesar, Sirajuddin Khan, Jan Nisar, Syed Tufail Hussain Sherazi
Ranolazine-Functionalized Cuo Nps: Efficient Homogeneous And Heterogeneouscatalysts For Reduction Of 4-Nitrophenol, Gul Naz Laghari Baloch, Sarfaraz Ahmed Mahesar, Sirajuddin Khan, Jan Nisar, Syed Tufail Hussain Sherazi
Turkish Journal of Chemistry
In the present study copper oxide nanoparticles (CuO NPs) were synthesized using a hydrothermal method with ranolazine as a shape-directing agent. Ranolazine-functionalized CuO NPs were characterized by various analytical techniques such as scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). The SEM pattern confirmed the morphology of ranolazine-functionalized CuO NPs with well-defined rice-like structures. FTIR spectroscopy confirmed the interaction between CuO NPs and ranolazine. The XRD analysis indicated that the structure of ranolazine-functionalized CuO NPs was monoclinic crystalline and the size ranged between 9 and 18 nm with an average particle size of 12 nm. …
Development Of Thermoplastic Polyurethane/Polyaniline-Doped Membranes Forthe Separation Of Glycine Through Electrodialysis, Khurram ., Asif Ali Qaiser, Rashid Saleem, Naveed Shahzad Ali, Shahbaz Nazir, Tousif Hussain, Abdul Ghaffar
Development Of Thermoplastic Polyurethane/Polyaniline-Doped Membranes Forthe Separation Of Glycine Through Electrodialysis, Khurram ., Asif Ali Qaiser, Rashid Saleem, Naveed Shahzad Ali, Shahbaz Nazir, Tousif Hussain, Abdul Ghaffar
Turkish Journal of Chemistry
Recently, membrane-based separation processes, particularly electrodialysis, have attracted attention for the separation and purification of organic and amino acids from animal feedstock waste. In this study, cation exchange membranes were synthesized by making a composite of thermoplastic polyurethane and polyaniline (PANI) via the doping of various aromatic sulfonic acids, such as ß -naphthol sulfonic acid and phenol sulfonic acid. The PANI was prepared using a standard method, which was further used in the composite blending at varying concentrations of 10%- 20%. The impact of the concentration of PANI and the nature of the dopant on the membrane characteristics were comparatively …
Synthesis, Spectroscopic Studies, And Antioxidant Activities Of Novelthio/Carbohydrazones And Bis-Isatin Derivatives From Terephthalaldehyde, Hali̇t Muğlu, Hasan Yakan, Temel Kan Bakir
Synthesis, Spectroscopic Studies, And Antioxidant Activities Of Novelthio/Carbohydrazones And Bis-Isatin Derivatives From Terephthalaldehyde, Hali̇t Muğlu, Hasan Yakan, Temel Kan Bakir
Turkish Journal of Chemistry
New bis(isatins-thio/carbohydrazones) based on Schiff bases were prepared from terephthalaldehyde biscarbohydrazone and 5-substituted isatins in the presence of a drop of sulfuric acid under reflux in ethanol. Terephthalaldehyde bis(thio/carbohydrazone) was synthesized by the reaction of (thio)/carbohydrazide and terephthalaldehyde in the presence of a few drops of acetic acid under reflux in ethanol. The structures of these synthesized compounds were determined using IR, $^{1}$H NMR, and $^{13}$C NMR spectroscopy and elemental analysis. The in vitro antioxidant activity of all the compounds was determined by the 1,1-diphenyl-2-picryl hydrazyl (DPPH.) free radical scavenging method. Compound 2 showed the best antioxidant activity.
Bet, Ftir, And Raman Characterizations Of Activated Carbon From Waste Oil Fly Ash, Rizwan Ali, Zaheer Aslam, Reyad A. Shawabkeh, Anam Asghar, Ibnelwaleed A. Hussein
Bet, Ftir, And Raman Characterizations Of Activated Carbon From Waste Oil Fly Ash, Rizwan Ali, Zaheer Aslam, Reyad A. Shawabkeh, Anam Asghar, Ibnelwaleed A. Hussein
Turkish Journal of Chemistry
Activated carbon (AC), a porous material with high pore volume, attracts increasing attention owing to its potential applications in several fields. The development of a porous structure in AC marginally relies on both the treatment methods and the type of precursor. Thus far, both renewable and nonrenewable precursor sources have been used to synthesize AC with high surface area and pore volume. This study presents the synthesis of AC via physicochemical treatment of waste oil fly ash (OFA), a waste material produced from power plants. The aim was to produce AC by adding surface pores and surface functional groups to …
Synthesis Of Metallo-Supramolecular Materials Based On Terpyridine Functionalized Double-Decker Silsesquioxane With Improved Complexation Efficienc, Asuman Çeli̇k Küçük, Jun Matsui, Tokuji Miyashita
Synthesis Of Metallo-Supramolecular Materials Based On Terpyridine Functionalized Double-Decker Silsesquioxane With Improved Complexation Efficienc, Asuman Çeli̇k Küçük, Jun Matsui, Tokuji Miyashita
Turkish Journal of Chemistry
Silsesquioxane-based transition-metal complexes have come to the forefront due to the ability of silsesquioxane to control nanostructures and properties. However, some difficulties in complete complexation and purification limit the widespread use of transition-metal-based supramolecular coordination complexes comprising silsesquioxane. Herein, 2 different approaches have been proposed for the synthesis of metallo-supramolecular materials on the basis of ruthenium(II)-terpyridine functional double-layer silsesquioxane (DDSQ) (Tpy/Ru-DDSQ) (Routes 1 and 2). In Route 1, complexation was followed by functionalization of DDSQ with the ligand, whereas in Route 2, complexation was performed before the ligand was inserted into the DDSQ. Tpy/Ru-DDSQ obtained from both approaches was characterized …
Gc-Ms Analysis Of The Methanolic Extracts Of Smilax China And Salix Alba And Their Antioxidant Activity, Abdul Qadir, Mohd Aqil, Athar Ali, Farhan J. Ahmad, Sayeed Ahmad, Muhammad Arif, Nausheen Khan
Gc-Ms Analysis Of The Methanolic Extracts Of Smilax China And Salix Alba And Their Antioxidant Activity, Abdul Qadir, Mohd Aqil, Athar Ali, Farhan J. Ahmad, Sayeed Ahmad, Muhammad Arif, Nausheen Khan
Turkish Journal of Chemistry
Smilax china L.(familySmilacaceae) and Salix alba L.(familySalicaceae)areplantsthathavebeentraditionally used to treat various ailments in Indian and Chinese medicine. A quantitative estimation of the methanolic extracts of these plants was performed by GC-MS analysis to obtain insight into its phytoconstituents responsible for therapeutic action. Theantioxidantpotentialofthemethanolextractsof Smilax china (MESC) and Salix alba (MESA) wereassessed with DPPH by using a UV spectrophotometer at a wavelength of 517 nm. The prevailing compounds found in MESC were lactam sugars including 2,5-dimethyl-2,4-dihydroxy-3(2H)-furanon (1.40%), 1,5-anhydro-6-deoxyhexo-2,3-diulose (4.33%), and alpha-methyl-1-sorboside (1.80%); the two alkaloids found were 1,4-methane-4,4a,5,6,7,8,9,9a-octahydro10,10-dimethyl cyclohepta[d] pyridazine (0.87%) and 1,3,7-trimethyl-2,6-dioxopurine(0.54%); terpenes included deltacadinene (0.39%), terpineol, (+)-cedrol (22.13%), 3-thujanol …
Proline-Based Organocatalyst-Mediated Asymmetric Aldol Reaction Of Acetone With Substituted Aromatic Aldehydes: An Experimental And Theoretical Study, Nevi̇n Arslan, Selami̇ Ercan, Necmetti̇n Pi̇ri̇nççi̇oğlu
Proline-Based Organocatalyst-Mediated Asymmetric Aldol Reaction Of Acetone With Substituted Aromatic Aldehydes: An Experimental And Theoretical Study, Nevi̇n Arslan, Selami̇ Ercan, Necmetti̇n Pi̇ri̇nççi̇oğlu
Turkish Journal of Chemistry
This work involves a facile synthesis of three (S)-proline-based organocatalysts with C$_{2}$ symmetry and their effects in enantioselective aldol reaction of acetone with substituted aromatic aldehydes. Moderate enantioselectivities (up to 61% ee) were obtained depending on the nature of the substituents on the aryl ring. Computational calculations at HF/6-31 + G(d) level were employed to underline the enantioselectivity imposed by all the organocatalysts. Higher calculations at B3LYP/6-311 ++ G(d,p) scrf=(solvent=dichloromethane)//B3LYP/6-31 + G(d) levels of theory were also performed for the aldol reaction of acetone with benzaldehyde and 4-nitrobenzaldehyde catalyzed by 1. The computationaloutcomeswereconsistentwiththoseproducedbyexperimentalresultsandtheywerevaluabletoelucidate the mechanism for the observed stereoselectivity.
A Comparative Study Of Silver Electrodeposition From Pyrophosphate-Cyanide And High Concentration Cyanide Electrolytes In The Presence Of Brighteners, Hati̇ce Kübra Akben, Servet İbrahi̇m Ti̇mur
A Comparative Study Of Silver Electrodeposition From Pyrophosphate-Cyanide And High Concentration Cyanide Electrolytes In The Presence Of Brighteners, Hati̇ce Kübra Akben, Servet İbrahi̇m Ti̇mur
Turkish Journal of Chemistry
A study of the electrodeposition of silver from 2 different types of electrolytes; (1) neutral pyrophosphatecyanide electrolyte and (2) alkaline high concentrated cyanide electrolyte in the presence of a variety of additives such as 2-mercaptobenzothiazole, potassium selenocyanate, and potassium antimony tartrate was performed. Influence of additives and cyanide concentration on microstructure and kinetics of the cathodic processes were studied. A brightener couple, 2-mercaptobenzothiazole and potassium antimony tartrate, were combined within this investigation anddetectedtobehighlyeffectiveforsilverelectrodeposition. Therapidincreaseincurrentdensityatthesamepotential interval related to grain refinement effect of potassium antimony tartrate was shown. The cyclic organic compound, 2mercaptobenzothiazole, polarizes the reduction to high cathodic potential in pyrophosphate …
Preparation And Characterization Of Form-Stable Phase Change Material/End-Of-Life Tires Composites For Thermal Energy Storag, Yeli̇z Konuklu
Preparation And Characterization Of Form-Stable Phase Change Material/End-Of-Life Tires Composites For Thermal Energy Storag, Yeli̇z Konuklu
Turkish Journal of Chemistry
The management of end-of-life tires (ELT) waste gains importance in aspect of possible environmental and economic issues so the waste recycling becomes unavoidable. This study describes the fabrication and characterization of a new phase changing material (PCM)/ELT microcomposites that could be used in thermal energy storage. Paraffin together with the 4 fatty acids and ELT rubber powder are used as PCMs and as the supporting material, respectively. Paraffin/ELT composites are fabricated, as well, by the vacuum impregnation method in order to investigate the effect of the preparation method. The thermal, morphological, and chemical properties of the prepared PCM/ELT rubber microcomposites …
Sensitive Determination Of Hydrogen Peroxide In Real Water Samples By High Spin Peroxo Complex, Tuğba Yavuz, Levent Peli̇t
Sensitive Determination Of Hydrogen Peroxide In Real Water Samples By High Spin Peroxo Complex, Tuğba Yavuz, Levent Peli̇t
Turkish Journal of Chemistry
In this paper, a fast, cheap, simple, sensitive and selective spectrophotometric method based on high spin peroxo-Fe(III)-EDTAcomplexinthealkalinemediumwasdevelopedforthedeterminationofhydrogenperoxide(H$_{2}$O$_{2}$) in real water samples. The purple-coloured complex with a maximum absorbance at a wavelength of 525 nm was formed. Various parameters such as type of stabilizer reagent and its concentration, reaction time, Fe(III), EDTA and NH3 concentration were optimized. The method was confirmed with the Beer?s law with a molar absorption coefficient of267.36Lmol$^{-1}$ cm$^{-1}$ in the 8.3×10$^{-6}$ -4.08×10$^{3}$ mol/L concentrationrange. Sandell's sensitivityoftheproposed method was also calculated as 0.188 µg/cm2. LOD and LOQ were determined as 2.5 ×10$^{-6}$ and 8.3 ×10$^{-6}$ mol/L, respectively. Intraday …
Preparation And Catalytic Evaluation Of Au/ Γ-Al2o3nanoparticles For The Conversion Of 4-Nitrophenol To 4-Aminophenol By Spectrophotometric Metho, Farhat Saira, Naveeda Firdous, Rumana Qureshi, Ayesha Ihsan
Preparation And Catalytic Evaluation Of Au/ Γ-Al2o3nanoparticles For The Conversion Of 4-Nitrophenol To 4-Aminophenol By Spectrophotometric Metho, Farhat Saira, Naveeda Firdous, Rumana Qureshi, Ayesha Ihsan
Turkish Journal of Chemistry
A set of catalysts having gold nanoparticles deposited on γ-Al$_{2}$O$_{3}$ ( Au/ γ-Al2O3) with lowest effective amount of gold content were prepared by successive impregnation and hydrogen reduction method. The structural featuresof prepared catalysts were analysed byX-ray diffraction(XRD), N2 physisorption, scanning electron microscopy (SEM), and Fourier transform infrared (FTIR). The catalytic activity was evaluated for the reduction of an organic pollutant 4-nitrophenol (4NP) to 4-aminophenol (4AP) by spectrophotometric analysis. Supported catalyst presented excellent catalytic ability to convert 4NP to 4AP in the presence of sodium borohydride (SBH) due to synergistic effect of Au NPs and mesoporous γ-Al$_{2}$O$_{3}$ support. The reduction …
Development Of A Biosensor Platform Based On Ito Sheets Modified With 3-Glycidoxypropyltrimethoxysilane For Early Detection Of Trap1, Berfi̇n Vural, Meltem Çalişkan, Mustafa Kemal Sezgi̇ntürk
Development Of A Biosensor Platform Based On Ito Sheets Modified With 3-Glycidoxypropyltrimethoxysilane For Early Detection Of Trap1, Berfi̇n Vural, Meltem Çalişkan, Mustafa Kemal Sezgi̇ntürk
Turkish Journal of Chemistry
The aim of this research was to design an electrochemical immunosensor for determination of tumour necrosis factor receptor-associated protein-1(TRAP1) antigen, a heat shock protein linked to tumour necrosis factor. The indium-tin oxide covered polyethylene terephthalate (ITO-PET) electrode surface was cleaned and was prepared for the introduction of hydroxyl groups on its surface by using NH$_{4}$ OH/H$_{2}$O$_{2}$/H$_{2}$O. As a silanization agent for covalent attachment of anti-TRAP1 on the surface of the ITO working electrode, 3-glycidoxypropyltrimethoxysilane (3-GOPS) was used. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to characterize the immobilization steps. A variety of parameters, 3-GOPS and anti-TRAP1 concentrations, …
Investigation Of The Effect Of Pan And Pan/Zno Photocatalysts On 100% Degradation Of Congo Red Under Uv Visible Light Irradiation And Lightless Environment, Si̇bel Zor, Bi̇lge Budak
Investigation Of The Effect Of Pan And Pan/Zno Photocatalysts On 100% Degradation Of Congo Red Under Uv Visible Light Irradiation And Lightless Environment, Si̇bel Zor, Bi̇lge Budak
Turkish Journal of Chemistry
PAn (polyaniline) and PAn/ZnO photocatalysts were synthesized using chemical polymerization of aniline. The structure characterization of the synthesized samples was analysed by using X-ray diffraction (XRD), Fourier transforminfraredspectroscopy(FT-IR),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM), and UV-Vis spectroscopy measurements, and thermal gravimetric analysis (TGA). The photocatalytic activities of PAn and PAn/ZnO (0.1g/100ml) on the degradation of the Congo red (CR) dye were studied under the UV visible light irradiation and the lightless environment and the efficiency of catalysts have been explained in details. Contribution of UV visible light irradiation on the 100% degradation of CR dye for the PAn and PAn/ZnO photocatalyst is determined. The reaction kinetics …
Phosphorus-Nitrogen Compounds- (Part 50): Correlations Between Structural Parameters For Cylophosphazene Derivatives Containing Ferrocenyl Pendant Arm(S), Nuran Asmafi̇li̇z, Gamze Elmas, Aytuğ Okumuş, Selen Bi̇lge Koçak, Zeynel Kiliç
Phosphorus-Nitrogen Compounds- (Part 50): Correlations Between Structural Parameters For Cylophosphazene Derivatives Containing Ferrocenyl Pendant Arm(S), Nuran Asmafi̇li̇z, Gamze Elmas, Aytuğ Okumuş, Selen Bi̇lge Koçak, Zeynel Kiliç
Turkish Journal of Chemistry
The results of a systematic study of spiro-cyclotri/tetraphosphazenes with ferrocenyl pendant arm on the basis of correlation between structural parameters were presented. The main parameters were obtained from Xray crystallography and 31 P NMR results in order to investigate the relationship between the δ P$_{spiro}$ shift values and endocyclic and exocyclic NPN bond angles, and electron density transfer parameters. Structural parameters derived from 11 types of the ferrocenyl cyclophosphazene derivatives with 5- to 7-membered spiro-rings introduced to the literature from our research group were studied and compared with each other.
Syntheses And Antibacterial Activities Of 4 Linear Nonphenolic Diarylheptanoids, Şemsi̇ Betül Demi̇r, Hati̇ce Seçi̇nti̇, Nesli̇han Çelebi̇oğlu, Murat Özdal, Alev Sezen, Özlem Gülmez, Ömer Faruk Algur, Hasan Seçen
Syntheses And Antibacterial Activities Of 4 Linear Nonphenolic Diarylheptanoids, Şemsi̇ Betül Demi̇r, Hati̇ce Seçi̇nti̇, Nesli̇han Çelebi̇oğlu, Murat Özdal, Alev Sezen, Özlem Gülmez, Ömer Faruk Algur, Hasan Seçen
Turkish Journal of Chemistry
Four linear nonphenolic diarylheptanoids were synthesized and their antibacterial activities were studied. ($S)$-2-Me-CBS-catalysed reduction of alnustone with BH$_{3}$.SMe$_{2}$ gave ($R)$(-)(4$E$,6$E)$-1,7-diphenylhepta-4,6-dien-3-ol, a natural product. Reduction of alnustone with Na in t-BuOH at -15 $^{\circ}$C under NH$_{3}$ atm gave ($E)$-1,7-diphenylhept-5-en-3-one as a Birch-type reduction product. $t$-BuOK catalysed condensation of benzalacetone with propionyl chloride gave (4$Z$,6$E)$-5-hydroxy-1,7-diphenylhepta-4,6-dien-3-one, a natural product. (1$E$,4$Z$,6$E)$-5-Hydroxy-4-phenethyl-1,7-diphenylhepta-1,4,6-trien-3-one, a curcuminoid, was synthesized starting from pentan-2,4-dione in 3 steps. The synthesized chemical compounds were applied against 2 gram-positive bacteria (Bacillus cereus and Arthrobacter agilis), 4 gram-negative bacteria (Pseudomonas aeruginosa, Xanthomonas campestris, Klebsiella oxytoca and Helicobacter pylori), and 1 yeast (Candida albicans) by …
Analysis Of Electrochemical Impedance Spectroscopy Response For Commercial Lithium-Ion Batteries: Modeling Of Equivalent Circuit Elements, Uğur Morali, Sali̇m Erol
Analysis Of Electrochemical Impedance Spectroscopy Response For Commercial Lithium-Ion Batteries: Modeling Of Equivalent Circuit Elements, Uğur Morali, Sali̇m Erol
Turkish Journal of Chemistry
Electrochemical impedance spectroscopy measurements were performed to capture the physically meaningful parameters of commercially available 18650 cylindrical and 2032 coin cells by using the equivalent circuit model. The impedance response of the batteries was systematically investigated and discussed. A detailed analysis was achieved providing a determination of influential factors on the equivalent circuit parameters. The results suggested that the cell type tested here influenced the equivalent circuit elements profoundly. Taguchi analysis indicated that state-of-charge had the highest effect on the cathodic constant-phase-element exponent. The results contribute to full electrochemical analysis that is required for battery characterization.
Mesoporous Starch Aerogels Production As Drug Delivery Matrices: Synthesis Optimization, Ibuprofen Loading, And Release Property, Akbar Mohammadi, Jafar Sadegh Moghaddas
Mesoporous Starch Aerogels Production As Drug Delivery Matrices: Synthesis Optimization, Ibuprofen Loading, And Release Property, Akbar Mohammadi, Jafar Sadegh Moghaddas
Turkish Journal of Chemistry
he aim of this work was to prepare biodegradable starch aerogels as drug carriers. The effective parameters in the synthesis and the optimal values of these parameters were determined using Minitab experimental design software. Ibuprofen was selected as a model drug for the dissolution study and loaded into optimized aerogel during the last solvent exchange step. The Fourier Transform Infrared Spectroscopy (FTIR) analysis showed that ibuprofen has been successfully loaded into the aerogel matrix without any effect on the aerogel nature. The drug loading was calculated to be 29%. The isotherm of ibuprofen adsorption into aerogels matrices followed from the …
Effect Of Polyelectrolyte Complex Formation On The Antibacterial Activity Of Copolymer Of Alkylated 4-Vinylpyridine, Murat Topuzoğullari
Effect Of Polyelectrolyte Complex Formation On The Antibacterial Activity Of Copolymer Of Alkylated 4-Vinylpyridine, Murat Topuzoğullari
Turkish Journal of Chemistry
Polymers bearing quaternized 4-vinylpyridine (QVP) groups are known for their antibacterial activities and these polymers can form polyelectrolyte complexes (PEC) with polyanions through electrostatic interactions. PEC formation can be used to adjust the antibacterial activity of polymers of QVP, deliver active molecules, or design antibacterial supramolecular structures. However, the antibacterial activity of PECs of QVP polymers has not been investigated. In this study, a copolymer of QVP was mixed with polyacrylic acid in various molar ratios of components to form PECs. Hydrodynamic diameters and zeta potentials of formed PECs were determined by dynamic and electrophoretic light scattering spectroscopy techniques. The …
Development And Validation Of An Hplc Method For Determination Of Rofecoxib In Bovine Serum Albumin Microspheres, Esra Demi̇rtürk, Emi̇rhan Nemutlu, Selma Şahi̇n, Levent Öner
Development And Validation Of An Hplc Method For Determination Of Rofecoxib In Bovine Serum Albumin Microspheres, Esra Demi̇rtürk, Emi̇rhan Nemutlu, Selma Şahi̇n, Levent Öner
Turkish Journal of Chemistry
A simple and reliable HPLC method was developed and validated for determination of rofecoxib in bovine serum albumin microsphere. The analyses were performed on a C18 column (150 x 4.6 mm, 5 μm particle size) at room temperature with UV detection at 272 nm. The mobile phase was composed of acetonitrile-0.1% o-phosphoric acid solution in water (1:1, v/v) mixture, and flow rate was set to 1 mL/min. The method was validated according to the international guidelines with respect to stability, linearity range, limit of quantitation and detection, precision, accuracy, specificity, and robustness. The detection and quantification limit of the method …
A Novel Fluorimetric Method For Determination Of Pseudoephedrine Hydrochloridein Pharmaceutical Formulations And Blood Serum, Nazli Farajzadeh, Nasrin Ranjbar Nader
A Novel Fluorimetric Method For Determination Of Pseudoephedrine Hydrochloridein Pharmaceutical Formulations And Blood Serum, Nazli Farajzadeh, Nasrin Ranjbar Nader
Turkish Journal of Chemistry
An inexpensive, simple, highly sensitive, and rapid fluorimetric method was developed for the analysis of pseudoephedrine hydrochloride at trace levels. The method is based on the recovery of fluorescence of Rh6G dye due to the interaction of pseudoephedrine hydrochloride with Rh6G-Au NPs complex, which results in the release of Rh6G from the complex and halting fluorescence resonance energy transfer between Rh6G and Au NPs. The intensity of fluorescence was directly proportional to the concentration of the analyte, which was used for its determination. Experimental factors were optimized by response-surface methodology. Under optimum conditions, the calibration curve was linear over the …
Extraction Of Heavy Metal Complexes From A Biofilm Colony For Biomonitoring The Pollution, Sedat Sürdem, Haci Mehmet Doğan
Extraction Of Heavy Metal Complexes From A Biofilm Colony For Biomonitoring The Pollution, Sedat Sürdem, Haci Mehmet Doğan
Turkish Journal of Chemistry
An extraction method was tested for biomonitoring the biofilm samples containing heavy metals. The fractionation of metal complexes was performed via C-18-HPLC-ICP-MS and MALDI-MS, respectively. The extraction power of some reagents was determined for the heavy metal extraction from biofilm samples collected in Erdemli coast in the Mediterranean Sea. The ammonium acetate solution giving the highest extraction results was found as a suitable extraction reagent. The concentration and pH of the ammonium acetate solution were optimized and found as 1 M and 5, respectively. The chromatograms of metal complexes with the C-18-HPLC-ICP-MS system were taken to determine the effect of …
Improvement Of The Adhesion Of Conductive Poly(M-Toluidine) Onto Chemically Reduced-Wool Fabrics, Meryem Kalkan Erdoğan, Meral Karakişla, Mehmet Saçak
Improvement Of The Adhesion Of Conductive Poly(M-Toluidine) Onto Chemically Reduced-Wool Fabrics, Meryem Kalkan Erdoğan, Meral Karakişla, Mehmet Saçak
Turkish Journal of Chemistry
Wool has disulphide bonds containing-hydrophobic external keratin layers, which act as a barrier for the modification through coating with hydrophilic materials. For that reason, in this work, to ensure a dense and homogenous conductive polymer coating onto the wool, the fabrics were subjected to the reduction process in the aqueous alkaline medium containing agents that can attack these disulphide bonds. Then, one of the polyaniline derivatives, poly($m$-toluidine) (PMT), was coated onto wool by in situ polymerization of $m$-toluidine sulphate using ammonium persulfate (APS) as an oxidant. The effects of conditions, such as the composition of reduction-bath and types of dopants …
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 …
Comparative Modelling Of A Novel Enzyme: Mus Musculus Leucine Decarboxylase, Ari̇f Sercan Şahutoğlu
Comparative Modelling Of A Novel Enzyme: Mus Musculus Leucine Decarboxylase, Ari̇f Sercan Şahutoğlu
Turkish Journal of Chemistry
Leucine decarboxylase (LDC) is a recently proposed enzyme with no official enzyme commission number yet. It is encoded by the Mus musculus gene Gm853 which is expressed at kidneys, generating isopentylamine, an alkylmonoamine that has not been described to be formed by any metazoan enzyme yet. Although the relevance of LDC in mammalian physiology has not been fully determined, isopentylamine is a potential modulator which may have effects on insulin secretion and healthy gut microbiota formation. The LDC is a stable enzyme that specifically decarboxylates L-leucine but does not decarboxylate ornithine or lysine as its paralogues ornithine decarboxylase (ODC; EC: …