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Full-Text Articles in Chemistry
Improvement Of Electrochemical And Structural Properties Of Polycarbazole By Simultaneous Electrodeposition Of Chitosan, Di̇dem Balun Kayan, Veysel Polat
Improvement Of Electrochemical And Structural Properties Of Polycarbazole By Simultaneous Electrodeposition Of Chitosan, Di̇dem Balun Kayan, Veysel Polat
Turkish Journal of Chemistry
Polycarbazole/chitosan composite materials were synthesized electrochemically at various loadings of chitosan (Chi). Their electrochemical, structural, thermal, and morphological characterizations were investigated by cyclic voltammetry, chronoamperometry, electrochemical impedance spectroscopy, Fourier transform infrared spectroscopy, thermal gravimetry, and scanning electron microscopy. Further electrical conductivity was measured using a four-point probe technique. The electrochemical results showed that the electrical conductivity of the polymeric composite film was increased by increasing the amount of Chi in the electrolyte medium. The as-prepared composite films exhibited enhanced electrical conductivity and structural properties of polycarbazole due to the presence of Chi in the composite films.
Syntheses And Photoluminescence Properties Of New Zn(Ii) And Cd(Ii) Coordination Polymers Prepared From 5-Sulfoisophthalate Ligand, Fati̇h Semerci̇
Syntheses And Photoluminescence Properties Of New Zn(Ii) And Cd(Ii) Coordination Polymers Prepared From 5-Sulfoisophthalate Ligand, Fati̇h Semerci̇
Turkish Journal of Chemistry
New coordination polymers, formulated as {[Zn($\mu $-sipH)($\mu $-apim)]$\cdot $3H$_{2}$O} $_{n}$ (1) and {[Cd($\mu $-sip)(H$_{2}$O)$_{2}$ (apimH)]$\cdot $3H$_{2}$O}$_{n}$ (2) were synthesized based on the 1-(3-aminopropyl)imidazole (apim) along with 5-sulfoisophthalate (sip) ligands. The complexes were synthesized under mild hydrothermal conditions. All the complexes were characterized by elemental analysis, FT-IR spectroscopy, and single-crystal X-ray diffraction studies. The X-ray crystallographic studies of 1 and 2 reveal Zn(II) and Cd(II) ions are $\mu $-bridged by dianionic sipH and trianionic sip ligands in bis(monodentate) and bis(bidentate) coordination mode, respectively, to generate 1D polymer chains. In complex 1, the adjacent chains are linked by two apim ligands to …
Efficient Multicomponent Synthesis Of 1,2,3-Triazoles Catalyzed By Cu(Ii) Supported On Pei@Fe$_{3}$O$_{4}$ Mnps In A Water/Peg$_{300}$ System, Zeinab Hassanpour, Aziz Maleki, Morteza Hosseini, Lena Gorgannezhad, Vajihe Nejadshafiee, Ali Ramazani, Ismaeil Haririan, Abbas Shafiee, Mehdi Khoobi
Efficient Multicomponent Synthesis Of 1,2,3-Triazoles Catalyzed By Cu(Ii) Supported On Pei@Fe$_{3}$O$_{4}$ Mnps In A Water/Peg$_{300}$ System, Zeinab Hassanpour, Aziz Maleki, Morteza Hosseini, Lena Gorgannezhad, Vajihe Nejadshafiee, Ali Ramazani, Ismaeil Haririan, Abbas Shafiee, Mehdi Khoobi
Turkish Journal of Chemistry
A highly dispersible and magnetically recoverable Cu-PEI@Fe$_{3}$O$_{4}$ MNPs catalyst was prepared and successfully applied in one-pot three-component coupling of terminal alkynes, sodium azide, and alkyl bromides/chlorides in water to give 1,4-disubstituted 1,2,3-triazoles with good to excellent yields. The catalyst was fully characterized with FT-IR, TGA, TEM, SEM, VSM, EDX, cyclic voltammetry, and ICP-AES spectroscopic techniques. Furthermore, the catalyst was easily recycled by an external magnet and successfully reused six times in the reaction without significant loss of its catalytic activity and copper leaching. The large-scale reaction was also carried out in the absence of any base and reducing agent even …
Synthesis Of Novel Derivatives Of Chromenone Bearing An $N$-Carbamothioyl Moiety As Soybean 15-Lox Inhibitors, Robabeh Kaviani, Mina Saeedi, Mohammad Mahdavi, Hamind Nadri, Alireza Moradi, Abbas Shafiee, Tahmineh Akbarzadeh
Synthesis Of Novel Derivatives Of Chromenone Bearing An $N$-Carbamothioyl Moiety As Soybean 15-Lox Inhibitors, Robabeh Kaviani, Mina Saeedi, Mohammad Mahdavi, Hamind Nadri, Alireza Moradi, Abbas Shafiee, Tahmineh Akbarzadeh
Turkish Journal of Chemistry
Novel derivatives of chromenone bearing an $N$-carbamothioyl moiety were synthesized and evaluated for their soybean 15-LOX inhibitory activity. Synthesis of the target compounds was started from 7-hydroxy-2$H$-chromen-2-one. It was reacted with 1-fluoro-2(4)-nitrobenzene to obtain the corresponding nitrophenoxy-chromenone derivative. Reduction of the nitro group was achieved in the presence of Zn/NH$_{4}$Cl and reaction of the latter compound with in situ prepared benzoyl isothiocyanate led to the formation of the title compounds. All compounds were characterized and tested against soybean 15-LOX. Among them, 4-methyl-$N$-((4-((2-oxo-2$H$-chromen-7-yl)oxy)phenyl)carbamothioyl)benzamide (7l) showed the best activity as potent as the reference drug, quercetin.
Synthesis, Characterization, And Antimicrobial Activities Of Novel Monosaccharide-Containing Schiff Base Ligands, Fatma Telli̇, Stephen Thomas Astley, Azi̇ze Yeşi̇m Salman
Synthesis, Characterization, And Antimicrobial Activities Of Novel Monosaccharide-Containing Schiff Base Ligands, Fatma Telli̇, Stephen Thomas Astley, Azi̇ze Yeşi̇m Salman
Turkish Journal of Chemistry
Four new chiral Schiff base ligands (3a-4a, 3b-4b) have been prepared using aminoisopropylidene derivatives of glucose and aminochloralose derivatives of mannose. The synthesized compounds 1 and 2 were characterized by nuclear magnetic resonance ($^{1}$H and $^{13}$C NMR), Fourier transform infrared spectroscopy (FTIR), UV/visible spectroscopy, and elemental analysis. A total of eight Schiff base compounds (3a-6a, 3b-6b) were tested for antimicrobial activity against Escherichia coli ATCC 12228, Staphylococcus aureus ATCC 6538, Klebsiella pneumoniae CCM 2318, Pseudomonas aeruginosa ATCC 27853, Salmonella typhimurium CCM 5445, Enterococcus faecalis ATCC 29212, Bacillus subtilis ATCC 6633, and Candida albicans ATCC 10239 and exhibited a range of …
Fabrication Of Multilayer Graphene Oxide-Reinforced High Density Polyethylene Nanocomposites With Enhanced Thermal And Mechanical Properties Via Thermokinetic Mixing, Burcu Saner Okan
Turkish Journal of Chemistry
High density polyethylene (HDPE) was compounded with thermally exfoliated graphene oxide (TEGO) by thermokinetic mixing in a short time. High shear rates during the compounding process provided high exfoliation and proper dispersion of graphene layers in the polymer matrix. Different TEGO/polymer ratios were used to get efficient melt mixing. Structural analysis by spectroscopic techniques confirmed the exfoliation of TEGO sheets and the coverage of their surfaces by HDPE chains. Furthermore, homogeneous dispersion of graphene sheets in the matrix led to the enhancement in the mechanical and thermal properties of HPDE-based nanocomposites. Especially stress concentration sites were significantly reduced by preventing …
Bis(Indoline-2,3-Diones): Versatile Precursors For Novel Bis(Spirooxindoles) Incorporating 4$H$-Chromene-3-Carbonitrile And Pyrano[2,3-$D$]Pyrimidine-6-Carbonitrile Derivatives, Said Ahmed Soliman Ghozlan, Muhammed Aly Ramadan, Amr Mohmed Abdelmoniem, Ahmed H. M. Elwahy, Ismail Abdelshafy Abdelhamid
Bis(Indoline-2,3-Diones): Versatile Precursors For Novel Bis(Spirooxindoles) Incorporating 4$H$-Chromene-3-Carbonitrile And Pyrano[2,3-$D$]Pyrimidine-6-Carbonitrile Derivatives, Said Ahmed Soliman Ghozlan, Muhammed Aly Ramadan, Amr Mohmed Abdelmoniem, Ahmed H. M. Elwahy, Ismail Abdelshafy Abdelhamid
Turkish Journal of Chemistry
Multicomponent reaction of dimedone or 1,3-dimethylbarbituric acid and malononitrile with a series of bis(indoline-2,3-diones) afforded the corresponding bis(2-amino-7,7-dimethyl-2',5-dioxo-5,6,7,8-tetrahydrospiro[chromene-4,3'-indoline]-3-carbonitrile) and bis(7'-amino-1',3'-dimethyl-2,2',4'-trioxo-1',2',3',4'-tetrahydrospiro[indoline-3,5'-pyrano [2,3-d]pyrimidine]-6'-carbonitrile) derivatives in good to excellent yield.
A Biochar-Modified Carbon Paste Electrode, Derya Bal Altuntaş, Gökçen Akgül, Jale Yanik, Ülkü Anik
A Biochar-Modified Carbon Paste Electrode, Derya Bal Altuntaş, Gökçen Akgül, Jale Yanik, Ülkü Anik
Turkish Journal of Chemistry
The present work examıned the use of biochar derived from tea waste as a novel electrode material. For the fabrication of the biochar electrode, suitable amounts of biochar and graphite were mixed with mineral oil for the first time. The electrochemical performance of the biochar-modified carbon paste electrode (BCPE) was measured by various cyclic voltammetric reactions for several redox systems. The factors affecting the electrode kinetics of BCPE surfaces were examined and optimized. The BCPE was applied as transducer in a glucose biosensor. The results reflect the effective properties of composite electrodes and the electrochemical properties of biochar showing that …
Singlet Oxygen Generation From Poly[4-Diacetoxyiodo]Styrene And Hydrogen Peroxide, Mustafa Çatir
Singlet Oxygen Generation From Poly[4-Diacetoxyiodo]Styrene And Hydrogen Peroxide, Mustafa Çatir
Turkish Journal of Chemistry
Treatment of hydrogen peroxide with a polymer-supported hypervalent iodine compound, poly[4-diacetoxyiodo] styrene (PDAIS), generates singlet molecular oxygen ($^{1}$O$_{2})$. Singlet oxygen generation was proved by trapping with typical organic compounds such as conjugated dienes, aromatic dienes, and electron-rich alkene. When compared to monomer analogue, the use of PDAIS in peroxidation of substrates gave slightly better yields (45%-96%). Regeneration and reuse of PDAIS showed similar activity. The mechanism underlying generation of singlet oxygen and reaction scope was examined.
Synthesis Of Neodymium-Iron Nanoperovskite For Sensing Applications Of An Antiallergic Drug, Nada F. Atta, Mohammad H. Binsabt, Ekram H. El-Ads, Ahmed Galal
Synthesis Of Neodymium-Iron Nanoperovskite For Sensing Applications Of An Antiallergic Drug, Nada F. Atta, Mohammad H. Binsabt, Ekram H. El-Ads, Ahmed Galal
Turkish Journal of Chemistry
A facile route was used for the fabrication of NdFeO$_{3}$ (NF) perovskite. The orthorhombic structure of single phase nanocrystalline NdFeO$_{3}$ perovskite was confirmed by different characterization techniques: XRD, FTIR, TEM, BET, SEM, and EDAX. The nanoperovskite was successfully used as a sensor component with a carbon paste electrode (CpE) for the determination of ketotifen in pharmaceutical formulations. Ketotifen, an antiallergic drug, is utilized for the treatment of asthma attacks, rhinitis, skin allergies, and anaphylaxis. Sodium dodecyl sulfate (SDS) was employed in a surface assembly mode to improve the sensitivity of the sensor response. The proposed sensor, NdFeO$_{3}$ in situ modified …
Diastereoselective Synthesis Of Novel 2,5-Dioxopyrrolidine Derivatives Via Biocatalytic Domino Reactions, Saadieh Mohajer, Robabeh Baharfar
Diastereoselective Synthesis Of Novel 2,5-Dioxopyrrolidine Derivatives Via Biocatalytic Domino Reactions, Saadieh Mohajer, Robabeh Baharfar
Turkish Journal of Chemistry
A series of novel 2,5-dioxopyrrolidines were synthesized by the one-pot reaction of coumarin-3-carboxylic acids 1 with thiourea derivatives and alkyl isocyanides in the presence of Fe$_{3}$O$_{4}$ NPs @ lipase as heterogeneous reusable nanobiocatalysts with high yields.
The Reactions Of N$_{3}$P$_{3}$Cl$_{6}$ With Monodentate And Bidentate Ligands: The Syntheses And Structural Characterizations, In Vitro Antimicrobial Activities, And Dna Interactions Of 4-Fluorobenzyl(N/O)Spirocyclotriphosphazenes, Aytuğ Okumuş, Gamze Elmas, Zeynel Kiliç, Nagehan Ramazanoğlu, Leyla Açik, Mustafa Türk, Gülçi̇n Akca
The Reactions Of N$_{3}$P$_{3}$Cl$_{6}$ With Monodentate And Bidentate Ligands: The Syntheses And Structural Characterizations, In Vitro Antimicrobial Activities, And Dna Interactions Of 4-Fluorobenzyl(N/O)Spirocyclotriphosphazenes, Aytuğ Okumuş, Gamze Elmas, Zeynel Kiliç, Nagehan Ramazanoğlu, Leyla Açik, Mustafa Türk, Gülçi̇n Akca
Turkish Journal of Chemistry
The Cl replacement reactions of 4-fluorobenzyl(N/O)spirocyclotriphosphazene (2) with excess monoamines led to the formation of 4-fluorobenzylspiro(N/O)tetraaminocyclotriphosphazenes (2a-2d). The partly substituted \textbf{dispiro 3b and dispiro 3c and fully substituted trispirocyclotriphosphazenes (trans 4a, cis 4c, 4d, and 4e) were obtained, respectively, from the reactions of 2 with one equimolar and two equimolar amounts of diamines, aminoalcohol, and diols. Although efforts were made for the separation of the cis/trans and optical isomers of the dispiro phosphazenes, only one set of diastereomers (RR/RS or SS/SR) of dispiro 3b and dispiro 3c was isolated, respectively. The $^{31}$P NMR spectral data of the other dispiro phosphazenes …
Ultrasonic Activation Of The Arylation Reaction Of Styrene Catalyzed By Transition Metals, Dhiab Atoui, Khemais Said, Ridha Ben Salem
Ultrasonic Activation Of The Arylation Reaction Of Styrene Catalyzed By Transition Metals, Dhiab Atoui, Khemais Said, Ridha Ben Salem
Turkish Journal of Chemistry
The arylation reaction of styrene was tested in the presence of different transition metal-based catalysts, mainly iron-based, given its low cost and its nonpolluting and nontoxic characteristics. The study of the effect of sonochemical activation on the evolution of the selectivity of the reaction is also proposed. Higher efficiency was observed for a very short period of time of just a few minutes. Furthermore, an improvement of the selectivity of the arylation of the external carbon of styrene was observed.
A New Method For Simultaneous Determination Of Trace Amounts Of Cu(Ii) And Ni(Ii) Ions By Preconcentration And Spectrophotometric Analysis, Berri̇n Topuz, Şennur Merve Adanur, Arda Yalçuk
A New Method For Simultaneous Determination Of Trace Amounts Of Cu(Ii) And Ni(Ii) Ions By Preconcentration And Spectrophotometric Analysis, Berri̇n Topuz, Şennur Merve Adanur, Arda Yalçuk
Turkish Journal of Chemistry
Immediate preconcentration and spectrophotometric methods have been developed for the determination of trace amounts of cupric ion (Cu(II)) and nickel ion (Ni(II)) through a solid phase extraction with XAD-4-N,N'-bis-(salicylidene) cyclohexanediamine (XAD-4-SCHD) resin and a complex color reaction of the ions with 2,6-dimethyl-morpholine dithiocarbamate (DMMDTC) in Triton X-100 media. A high preconcentration factor of 125 was achieved. The spectrophotometric method was based on the measurements of the absorption of colored chelates of ions complexing with DMMDTC, and the adsorptions of the complex solutions were measured at their maximum absorption peaks at 460 and 328 nm for Cu(II) and Ni(II) ions, respectively. …
Synthesis And Antinociceptive Activities Of Some Novel Benzimidazole-Piperidine Derivatives, Ümi̇de Demi̇r Özkay, Özgür Devri̇m Can, Nazli Turan, Betül Kaya Çavuşoğlu
Synthesis And Antinociceptive Activities Of Some Novel Benzimidazole-Piperidine Derivatives, Ümi̇de Demi̇r Özkay, Özgür Devri̇m Can, Nazli Turan, Betül Kaya Çavuşoğlu
Turkish Journal of Chemistry
In this study, a series of benzimidazole-piperidine derivatives were synthesized with the objective of developing potent antinociceptive agents. Some 2-(4-substituted-phenyl)-1-[2-(piperidin-1-yl)ethyl]-1$H$-benzimidazole derivatives were obtained by microwave-supported reaction of an appropriate 2-(4-substituted-phenyl)-1$H$-benzimidazole with 2-(piperidine-1-yl)ethyl chloride. The chemical structures of the compounds were elucidated by FT-IR, $^{1}$H NMR, $^{13}$C NMR, and HRMS spectral data. Antinociceptive activity was assessed by conducting hot-plate, paw-pressure, and formalin tests. Morphine (5 mg/kg, i.p) was used as a reference drug. Among the tested compounds 2a-2d and 2f-2h (10 mg/kg) increased the maximum possible effect (MPE) % values calculated for the hot-plate and paw-pressure tests and decreased the paw …
Adsorption Of Cu(Ii) On Three Adsorbents, Fe$_{3}$O$_{4}$/Ni/Ni$_{X}$B Nanocomposite, Carob (\Textit{Ceratonia Siliqua}), And Grape Seeds: A Comparative Study, Tüli̇n Deni̇z Çi̇ftçi̇
Adsorption Of Cu(Ii) On Three Adsorbents, Fe$_{3}$O$_{4}$/Ni/Ni$_{X}$B Nanocomposite, Carob (\Textit{Ceratonia Siliqua}), And Grape Seeds: A Comparative Study, Tüli̇n Deni̇z Çi̇ftçi̇
Turkish Journal of Chemistry
A novel adsorbent Fe$_{3}$O$_{4}$/Ni/Ni$_{x}$B nanocomposite was synthesized and used for the adsorption of copper. Moreover, natural adsorbents carob and grape seeds were used for this purpose. The surfaces and the elemental compositions of the adsorbents were characterized by SEM-EDX. The zero point charges of pH of Fe$_{3}$O$_{4}$/Ni/Ni$_{x}$B nanocomposite, carob, and grape seeds were found as 8.4, 6.0, and 5.6, respectively. The Langmuir, Freundlich, and Dubinin--Radushkevich isotherm models were used for the identification of the mechanism of the adsorption. The adsorptions of Cu(II) on the three adsorbents were well fitted to the Langmuir isotherm. The maximum adsorption capacities obtained from the …
Palladium Nanoparticles Entrapped In Melamine-Formaldehyde Resin Microparticles For Mizoroki--Heck Reactions, Shaofeng Zhong
Palladium Nanoparticles Entrapped In Melamine-Formaldehyde Resin Microparticles For Mizoroki--Heck Reactions, Shaofeng Zhong
Turkish Journal of Chemistry
Melamine-formaldehyde resin (MFR) microparticles with average diameters of 1.06 $\mu $m were synthesized with PEG-20000 as the particle-forming agent. Palladium nanoparticles were entrapped in and adsorbed on the MFR microparticles, consecutively. Scanning electron microscopy (SEM) was used to characterize the morphologies of MFR microparticles. X-ray diffraction (XRD) and transition electron microscopy (TEM) showed that the palladium nanoparticles entrapped in the MFR microparticles dispersed much more homogeneously than those adsorbed on the MFR microparticles. Mizoroki--Heck reaction catalysis results demonstrated that the entrapped palladium catalyst had similar catalytic activity with the adsorbed palladium catalyst. Moreover, this novel entrapped palladium catalyst could be …
Catalytic Application Of 1,3,5-Triazine-Pentaethylenehexamine Polymer-Supported Palladium Nanoparticles In The Convenient Reduction Of Nitroarenes With Sodium Borohydride Or Hydrazine, Hayri̇ye Genç, Mustafa Zengi̇n, Mustafa Küçüki̇slamoğlu, Mustafa İmamoğlu, Hüseyi̇n Özkan Toplan, Mustafa Arslan
Catalytic Application Of 1,3,5-Triazine-Pentaethylenehexamine Polymer-Supported Palladium Nanoparticles In The Convenient Reduction Of Nitroarenes With Sodium Borohydride Or Hydrazine, Hayri̇ye Genç, Mustafa Zengi̇n, Mustafa Küçüki̇slamoğlu, Mustafa İmamoğlu, Hüseyi̇n Özkan Toplan, Mustafa Arslan
Turkish Journal of Chemistry
The catalytic activity of 1,3,5-triazine-pentaethylenehexamine (TAPEHA) polymer-supported Pd nanoparticles was investigated in the reduction of nitro arenes to the corresponding amines by NaBH$_{4}$ or N$_{2}$H$_{4}$.H$_{2}$O. Optimized reaction conditions for both systems were successfully tested on 20 nitroarenes with different characteristics. Considerably high yields (80%-98% in NaBH$_{4}$ and 85%-98% in N$_{2}$H$_{4})$ were obtained in a short time and at ambient temperature. In addition to these methods being selective against other reducible functionalities such as -CN, -Br, -Cl, and -I, the catalyst can be recovered easily and reused more than ten times.
Understanding Of Phenolic Compound Retention Mechanisms On Pes-Uf Membrane, Amine Mnif, Meral Mouelhi, Bechir Hamrouni
Understanding Of Phenolic Compound Retention Mechanisms On Pes-Uf Membrane, Amine Mnif, Meral Mouelhi, Bechir Hamrouni
Turkish Journal of Chemistry
Ultrafiltration (UF) is investigated as a possible alternative to remove organic compounds from aqueous synthetic solution. This paper presents a comprehensive study towards a better understanding of phenolic compound retention mechanisms during UF processes. Thus, removal of phenol and resorcinol was studied using a polyethersulfone ultrafiltration (PES-UF) membrane. The influence of main operating conditions (feed concentration, transmembrane pressure, and pH) on the retention was evaluated. Membrane--solute interactions were found to play an important role during the process, suggesting the adsorption of the target compounds on the PES-UF membrane. The level of adsorption was consequently evaluated by measuring the quantity of …
Methanolysis Of Jatropha Curcas Oil Using K$_{2}$Co$_{3}$/Cao As A Solid Base Catalyst, Gajanan Sahu, Sujan Saha, Sudipta Datta, Prakash Chavan, Satyanarayan Naik
Methanolysis Of Jatropha Curcas Oil Using K$_{2}$Co$_{3}$/Cao As A Solid Base Catalyst, Gajanan Sahu, Sujan Saha, Sudipta Datta, Prakash Chavan, Satyanarayan Naik
Turkish Journal of Chemistry
Biodiesel, fatty acid methyl ester produced by the transesterification of vegetable oil with methanol, is a promising alternative to petroleum-based diesel fuel. In the present study, the methanolysis of high free fatty acid (FFA) $Jatropha$ $curcas$ oil in a transesterification reaction using K$_{2}$CO$_{3}$/CaO solid base catalyst was studied. The various reaction parameters in the transesterification reaction were also discussed. The catalyst was characterized by means of Fourier transform infrared, X-ray diffraction, temperature programmed desorption of CO$_{2}$, scanning electron microscopy, particle size analyzer, true density, and surface area analyzer. The optimum conversion of jatropha oil was 92% when the transesterification reaction …
Separation And Recovery Of Gallium(Iii) Ions From Aqueous Phase By Liquid--Liquid Extraction Using A Novel Extractant, Cyphos Il 101, Sumitra Nayak, Niharbala Devi
Separation And Recovery Of Gallium(Iii) Ions From Aqueous Phase By Liquid--Liquid Extraction Using A Novel Extractant, Cyphos Il 101, Sumitra Nayak, Niharbala Devi
Turkish Journal of Chemistry
The present study describes the extraction behavior of gallium(III) using a novel ionic liquid trihexyl(tetradecyl) phosphonium chloride (Cyphos IL 101) diluted with kerosene from acidic chloride medium. The extraction of gallium was found to depend on the hydrochloric acid concentration and quantitative extraction of gallium took place at 2.0 mol/L HCl concentration. The nature of the extracted complex in the organic phase was determined using Job's method and proposed to be [R$_{3}$R$^\prime $PGaCl$_{4}$]. The loading capacity of 5.0 $\times$ 10$^{-3}$ mol/L Cyphos IL 101 was determined to be 320.0 mg/L. Two stages of stripping were required for complete removal of …
Investigation Of The Photophysical And Photochemical Behavior Of Substituted Zinc Phthalocyanines And Their Water-Soluble Quaternized Derivatives, Gülsev Di̇lber, Mahmut Durmuş, Hali̇t Kanteki̇n
Investigation Of The Photophysical And Photochemical Behavior Of Substituted Zinc Phthalocyanines And Their Water-Soluble Quaternized Derivatives, Gülsev Di̇lber, Mahmut Durmuş, Hali̇t Kanteki̇n
Turkish Journal of Chemistry
New nonperipherally and peripherally tetrasubstituted zinc(II) phthalocyanine complexes containing 1-benzylpiperidin-4-ol groups and their quaternized derivatives are reported in this work. These complexes were characterized successfully and their photophysical and photochemical properties were studied. These properties were determined in dimethylsulfoxide for all studied complexes and in water and water $+$ Triton X-100 solutions for ionic Zn(II) phthalocyanines. All studied zinc(II) phthalocyanine complexes generated high singlet oxygen, especially in dimethylsulfoxide, and these properties make them potential photosensitizers for use in the photodynamic therapy of cancer. The effects of the position and quaternization of the substituents on the photophysical and photochemical properties were …
Naked Eye And Smartphone Applicable Detection Of Toxic Mercury Ions Using Fluorescent Carbon Nanodots, Burcu Baç, Rükan Genç
Naked Eye And Smartphone Applicable Detection Of Toxic Mercury Ions Using Fluorescent Carbon Nanodots, Burcu Baç, Rükan Genç
Turkish Journal of Chemistry
Chitosan passivated carbon nanodots (C-Dots$_{CHIT})$ were synthesized from expired molasses via a simple and green thermal synthesis procedure. As-synthesized C-Dots were nitrogen-doped (NC-Dots$_{CHIT})$ by posttreatment with liquid ammonia and used as nanoprobes for fluorometric detection of mercury ions (Hg(II)$_{aq.})$. Fluorescence response of NC-Dots$_{CHIT}$ in the presence of mercury was evaluated and compared with that of the polyethylene glycol passivated C-Dots$_{PEG}$. This sensing strategy using NC-Dots$_{CHIT}$ displayed a wide linear working range from 1.25 $\mu $g/mL to 43.54 $\mu $g/mL with a detection limit of 1.41 $\mu $g/mL. The fluorescence of C-Dots$_{PEG}$ did not show any significant change upon mercury addition. …
Ultrasound-Assisted Surfactant/Ionic Liquid Aqueous Two-Phase System Extraction Prior To High Performance Liquid Chromatography For The Determination Of Tetracyclines In Milk And Honey Samples, Hayri̇ye Mi̇ne Antep, Taşkin Mumcu, Kami̇l Bostanci, Serap Seyhan Bozkurt, Melek Merdi̇van
Ultrasound-Assisted Surfactant/Ionic Liquid Aqueous Two-Phase System Extraction Prior To High Performance Liquid Chromatography For The Determination Of Tetracyclines In Milk And Honey Samples, Hayri̇ye Mi̇ne Antep, Taşkin Mumcu, Kami̇l Bostanci, Serap Seyhan Bozkurt, Melek Merdi̇van
Turkish Journal of Chemistry
In this work, an ultrasonic-assisted surfactant/ionic liquid aqueous two-phase system (ATPS) extraction method was developed to extract six tetracycline antibiotics from food samples before their chromatographic determination using high performance liquid chromatography. The ATPS was formed with 1-allyl-3-methyl-imidazolium bromide, Triton X-100, and dipotassium hydrogen phosphate. The parameters including type and amount of surfactant, ionic liquid and salt, pH of sample solution, and sonication time were optimized. Under the optimized conditions, linear calibration curves of the six tetracyclines were obtained in the range of 10--500 $\mu $g L$^{-1}$ with $>$ r$^{2} =$ 0.990 (n $=$ 9). The proposed green analytical …
Spectrophotometric Detection Of Rhodamine B In Tap Water, Lipstick, Rouge, And Nail Polish Samples After Supramolecular Solvent Microextraction, Nebi̇ye Özkantar, Mustafa Soylak, Mustafa Tüzen
Spectrophotometric Detection Of Rhodamine B In Tap Water, Lipstick, Rouge, And Nail Polish Samples After Supramolecular Solvent Microextraction, Nebi̇ye Özkantar, Mustafa Soylak, Mustafa Tüzen
Turkish Journal of Chemistry
A simple and sensitive supramolecular solvent-based dispersive liquid--liquid microextraction method was described for the separation/preconcentration and spectrophotometric detection of rhodamine B. The microextraction method, which was realized at ambient temperature for the detection of rhodamine B, was carried out by using supramolecular solvents such as tetrahydrofuran and decanoic acid. The method was based on analyses of rhodamine B by using UV-Vis spectrophotometry at 558 nm. The influences of some parameters such as pH, sample volume, eluent solutions, centrifugation time, and ultrasonic bath time were optimized. The effects of various matrix ions were also investigated. Moreover, the limit of detection and …
Adsorption Of Copper Ions And Alizarin Red S From Aqueous Solutions Onto A Polymeric Nanocomposite In Single And Binary Systems, Omnia Ali, Sahar Mohamed
Adsorption Of Copper Ions And Alizarin Red S From Aqueous Solutions Onto A Polymeric Nanocomposite In Single And Binary Systems, Omnia Ali, Sahar Mohamed
Turkish Journal of Chemistry
Adsorption of Cu(II) ions and alizarin red S (ARS) has been studied using beads of chitosan (CS) and a chitosan/ZnO nanorod composite (CS-ZnO) in single and binary systems. The beads were synthesized and characterized using Fourier transform infrared spectroscopy, X-ray diffraction, high-resolution transmission electron microscopy, scanning electron microscopy, and energy dispersive X-ray analysis. Factors affecting adsorption of Cu(II) ions and ARS such as pH and initial concentrations as well as adsorption kinetics, isotherms, thermodynamics, reusability, and competitive adsorption in binary systems were studied. The results showed that the adsorption kinetics and isotherm data for both adsorbates followed a pseudo-second-order model …
A Simple And Effective Method For Determination Of The Antithyroid Drug Carbimazole Using Ruthenium Trichloride, Mukul Sharma, Afraim Koty, Abdul Jabbar Al Rajab
A Simple And Effective Method For Determination Of The Antithyroid Drug Carbimazole Using Ruthenium Trichloride, Mukul Sharma, Afraim Koty, Abdul Jabbar Al Rajab
Turkish Journal of Chemistry
An accurate, precise, and simple spectrophotometric method is proposed for the determination of the antithyroid drug carbimazole using ruthenium(III) chloride. This method is based on the formation at room temperature of a stable yellow-colored complex with λ$_{max}$ 370 nm. The method has a Beer's law range of 7.81 to 1.95 $\times $ 10$^{2}$ $\mu $g mL$^{-1}$, molar absorptivity coefficient $\varepsilon =$ 1.519 $\times $ 10$^{3}$ L mol$^{-1}$ cm$^{-1}$, and correlation coefficient of 0.997. The metal:ligand (M:L) ratio of the complex was confirmed by the mole ratio and Job's method of continuous variation, suggesting a 1:2 stoichiometry. The formed carbimazole:Ru(III) complex …
Synthesis Of New Hexahydro-1h-Isoindole-1,3(2h)-Dione Derivatives From 2-Ethyl/Phenyl-3a,4,7,7a-Tetrahydro-1h-Isoindole-1,3-(2h)-Dione, Ayşe Tan, Bi̇rgül Koç, Nurhan Ki̇shali, Ertan Şahi̇n, Yunus Kara
Synthesis Of New Hexahydro-1h-Isoindole-1,3(2h)-Dione Derivatives From 2-Ethyl/Phenyl-3a,4,7,7a-Tetrahydro-1h-Isoindole-1,3-(2h)-Dione, Ayşe Tan, Bi̇rgül Koç, Nurhan Ki̇shali, Ertan Şahi̇n, Yunus Kara
Turkish Journal of Chemistry
A new and appropriate synthesis for hexahydro-1H-isoindole-1,3(2H)-dione derivatives has been developed starting from 3-sulfolene. The epoxidation of 2-ethyl/phenyl-3a,4,7,7a-tetrahydro-1H-isoindole-1,3-(2H)-dione and then the opening of the epoxide with nucleophiles gave hexahydro-1H-isoindole-1,3(2H)-dione derivatives. Amino and triazole derivatives of hexahydro-1H-isoindole-1,3(2H)-dione were synthesized from the formed product by the opening reaction of the epoxide with sodium azide. Hydroxyl analogues were obtained from cis-hydroxylation of 2-ethyl/phenyl-3a,4,7,7a-tetrahydro-1H-isoindole-1,3-(2H)-dione. The hydroxyl groups were converted to acetate.
An Indirect Model For Sintering Thermodynamics, Yüksel Sarikaya, Müşerref Önal
An Indirect Model For Sintering Thermodynamics, Yüksel Sarikaya, Müşerref Önal
Turkish Journal of Chemistry
A model was proposed and used to calculated the changes in enthalpy $(\Delta H^{o})$, entropy $(\Delta S^{o}),$ and Gibbs energy $(\Delta G^{o})$, as well as equilibrium constant $(K)$ relating to the sintering of alumina compacts. Specific nanopore volume $(V)$ of the compacts was assumed as a thermodynamic variable. A hypothetical equilibrium constant $(K_{h})$ and corresponding Gibbs energy $(\Delta G_{h}^{o})$ were calculated depending on the $V$ value measured after each sintering. The thermodynamic relationships with the SI units were respectively evaluated for the initial-stage $(i)$ sintering between 1000 and 1200 $^{\circ}$C and final-stage $(f)$ sintering between 1200 and 1600 $^{\circ}$C in …
Chromate Surface-Imprinted Silica Gel Sorbent For Speciation Of Cr In Surface Waters, Mariya Mitreva, Ivanka Dakova, Tanya Yordanova, Irina Karadjova
Chromate Surface-Imprinted Silica Gel Sorbent For Speciation Of Cr In Surface Waters, Mariya Mitreva, Ivanka Dakova, Tanya Yordanova, Irina Karadjova
Turkish Journal of Chemistry
This study is focused on the synthesis of chromate anion imprinted sorbent supported on silica gel for nonchromatographic Cr speciation in surface waters. The preparation procedure is based on grafting of 3-methyl-1-trimethoxysilylpropylimidazolium, preliminarily coordinated to CrO$_{4}^{2-}$ as a template ion, onto the surface of silica gel. Sorption and desorption characteristics of surface-imprinted sorbent toward Cr(III) and Cr(VI) were examined by batch solid-phase extraction. An excellent separation of Cr(VI), selectively retained on the sorbent, from Cr(III) remained in the solution, was achieved at pH 2-3 for 20 min. A freshly prepared mixture of ascorbic acid and nitric acid was selected as …