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Influence Of Reaction Parameters On The Synthesis Of Surfactant-Assisted Tin Oxide Nanoparticles, Muhammad Akhyar Farrukh, Prisca Tan, Rohana Adnan
Influence Of Reaction Parameters On The Synthesis Of Surfactant-Assisted Tin Oxide Nanoparticles, Muhammad Akhyar Farrukh, Prisca Tan, Rohana Adnan
Turkish Journal of Chemistry
Tin oxide nanoparticles were synthesized via hydrothermal method using a non-ionic surfactant, oleyl amine (OLM), in the presence of urea. The reactions were carried out at different calcination temperatures and varying concentrations of surfactant and urea. The effect of these reaction parameters on the particles' size, distribution, surface area, and the average pore diameter were investigated using X-ray diffraction analysis, transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray analysis, thermogravimetric analysis, Brunauer-Emmett-Teller method, and Fourier transform infrared spectroscopy. Larger tin oxide nanoparticles were obtained with higher concentrations of urea. At the optimum experimental conditions, tin oxide nanoparticles with mean …
Polymers From Renewable Resources: Synthesis And Characterization Of Poly(2,5-Dihydro-2,5-Dimethoxy Furan), Hakan Çi̇ftçi̇, Zeki̇ Öktem, Hasan Nur Testereci̇
Polymers From Renewable Resources: Synthesis And Characterization Of Poly(2,5-Dihydro-2,5-Dimethoxy Furan), Hakan Çi̇ftçi̇, Zeki̇ Öktem, Hasan Nur Testereci̇
Turkish Journal of Chemistry
The cationic polymerization of cis, trans-2,5-dihydro-2,5-dimethoxy furan (DHMF) was studied in the presence of HClO_4, in acetonitrile. Different reaction parameters were investigated such as initiator concentration and temperature with duration. Obtained polymers were soluble in dimethylsulfoxide (DMSO) and dimethylformamide (DMF) and the M_n value was calculated as 2700 g/mol by cryoscopy. The FT-IR and ^1H-NMR results indicate that the polymerization proceeds via ring opening. Thermal properties were studied by DSC and TGA.
Novel Biologically Active Glycosides From The Aerial Parts Of Cephalaria Gazipashensis, Nazli Böke Sarikahya, Süheyla Kirmizigül
Novel Biologically Active Glycosides From The Aerial Parts Of Cephalaria Gazipashensis, Nazli Böke Sarikahya, Süheyla Kirmizigül
Turkish Journal of Chemistry
Two new triterpene glycosides, 3-O-\beta-D-glucopyranosyl- (1\to 4)-\beta-D-xylopyranosyl-(1\to 3)-\alpha-L-rhamnopyranosyl- (1\to 3)-\alpha-L-arabinopyranosyl olean-12-ene 28-O-\beta -D- glucopyranosyl-(1\to 6)-\beta-D-glucopyranosyl ester (gazipashoside A, 1) and 3-O-\beta-D-glucopyranosyl-(1\to 4)-\beta-D-xylopyranosyl- (1\to 3)-\alpha-L-rhamnopyranosyl-(1\to 2)-\alpha-L-arabinopyranosyl hederagenin 28-O-\beta -D-glucopyranosyl-(1\to 6)-\beta-D-glucopyranosyl ester (gazipashoside B, 2), were isolated together with 11 known compounds including 7 triterpene, 1 flavonoid, and 3 iridoidal metabolites from the aerial parts of Cephalaria gazipashensis (Dipsacaceae). The structures of all compounds were elucidated by extensive evaluation of the spectroscopic data (1D- and 2D- NMR, HRESI-MS), as well as chemical examinations. The antimicrobial effects of all pure compounds were tested against gram-positive and gram-negative bacteria. The results indicated that the …
Simultaneous Determination Of Cr(Iii) And Cr(Vi) Using Differential Pulse Polarography And Application To Gerede River, Olcay Şendi̇l, Nabeel Mohammed, Güler Somer
Simultaneous Determination Of Cr(Iii) And Cr(Vi) Using Differential Pulse Polarography And Application To Gerede River, Olcay Şendi̇l, Nabeel Mohammed, Güler Somer
Turkish Journal of Chemistry
Determination of Cr(III) in the presence of Cr(VI) from one polarogram is not easy. No such procedure was found in the literature. In polarographic studies Cr(III) had a peak only in acidic medium, while Cr(VI) had either 1 or 2 peaks in both acidic and basic solutions. In solutions that contain these 2 ions, the peak obtained in acidic medium for Cr(III) will be the sum of both ions. Thus, Cr(III) cannot be determined directly from one polarogram. In this work, a new and simple polarographic method is established for the determination of Cr(III) and Cr(VI) by using only one …
Synthesis And Antimicrobial Evaluation Of Some Annelated Phthalazine Derivatives And Acyclo C-Nucleosides From 1-Chloro-4-(2,4,6-Trimethylphenyl) Phthalazine Precursor, Maher Abdel Aziz El-Hashash, Ahmed Youssef Soliman, Ibrahim Essam Elshamy
Synthesis And Antimicrobial Evaluation Of Some Annelated Phthalazine Derivatives And Acyclo C-Nucleosides From 1-Chloro-4-(2,4,6-Trimethylphenyl) Phthalazine Precursor, Maher Abdel Aziz El-Hashash, Ahmed Youssef Soliman, Ibrahim Essam Elshamy
Turkish Journal of Chemistry
A highly efficient and versatile synthetic approach to the synthesis of annelated phthalazine derivatives viz. 1,2,4-triazolo [3,4-a]phthalazine 11a,b, 14, 18, 19a,b, 29-31, 33, 1,2,4-triazino [3,4-a]phthalazine 25a,b-28, 1,3,5-triazino[4,3-a]phthalazine 22, tetrazolo[5,1-a] phthalazine 23, imidazophthalazine 9a,b,15, and pyrimidinophthlazine 6, 10, 16, 17, 20 is presented. Moreover, acyclo C-nucleoside and double headed acyclo C-nucleoside of 1,2,4-triazolo[3,4-a]phthalazine 12, 13 were obtained via heterocyclization reaction of 1-chloro-4-(2,4,6-trimethylphenyl) phthalazine (4) with gluconic acid hydrazide and galactaric acid bis hydrazide, respectively. The new compounds were synthesized with the objective of studying their antimicrobial activity.
Synthesis, Anti-Inflammatory, Antiplatelet And In Silico Evaluations Of (E)-3-(3-(2,3-Dihydro-3-Methyl-2-Oxo- 3h-Benzoxazole-6-Yl)-1-Phenyl-1h-Pyrazole- 4-Yl)Acrylamides, Sultan Baytaş, Ni̇lüfer Nermi̇n Turan Dural, Yeşi̇m Özkan, Hasan Bolkan Şi̇mşek, Türki̇z Gürsel, Serdar Ünlü
Synthesis, Anti-Inflammatory, Antiplatelet And In Silico Evaluations Of (E)-3-(3-(2,3-Dihydro-3-Methyl-2-Oxo- 3h-Benzoxazole-6-Yl)-1-Phenyl-1h-Pyrazole- 4-Yl)Acrylamides, Sultan Baytaş, Ni̇lüfer Nermi̇n Turan Dural, Yeşi̇m Özkan, Hasan Bolkan Şi̇mşek, Türki̇z Gürsel, Serdar Ünlü
Turkish Journal of Chemistry
A series of (E)-3-(3-(2,3-dihydro-3-methyl-2-oxo-3H-benzoxazole- 6-yl)-1-phenyl-1H-pyrazole-4-yl)acry- lamides (7a--k) were synthesized and evaluated for their in vitro inhibitory activities on COX-1 and COX-2 isoforms using a human whole blood assay as well as their antiplatelet profile against human platelet aggregation using arachidonic acid as agonists. Among the synthesized derivatives 7a--k, especially compound 7g exhibited dual anti-inflammatory and antiplatelet activity with selective COX-2 inhibition.
Competitive Hydrogen Bonding In Aspirin-Aspirin And Aspirin-Leucine Interactions, Zeynep Yurtsever, Burak Erman, İsmai̇l Ersi̇n Yurtsever
Competitive Hydrogen Bonding In Aspirin-Aspirin And Aspirin-Leucine Interactions, Zeynep Yurtsever, Burak Erman, İsmai̇l Ersi̇n Yurtsever
Turkish Journal of Chemistry
Aspirin-aspirin and aspirin-leucine interactions are studied by the density functional theory (DFT) and high level ab initio calculations with second order Moller-Plesset perturbation theory (MP2). The rotational isomers of aspirin are identified by their relative stability both in gaseous phase and in water using the polarizable continuum method (PCM). Local minima of aspirin monomers in water are found to be all highly populated compared to the gas phase behavior. Homodimers of aspirin form hydrogen bonds with bond energies of 10 kcal/mol. Weak hydrogen bonds utilizing phenyl and methyl groups are also found. The interaction between aspirin and leucine is stronger …
Copolymerization Of N-Vinyl Pyrrolidone With Methyl Methacrylate By Ti(Iii)-Dmg Redox Initiator, Ajithkumar Manayan Parambil, Yashoda Malagar Puttaiahgowda, Prasannakumar Shankarappa
Copolymerization Of N-Vinyl Pyrrolidone With Methyl Methacrylate By Ti(Iii)-Dmg Redox Initiator, Ajithkumar Manayan Parambil, Yashoda Malagar Puttaiahgowda, Prasannakumar Shankarappa
Turkish Journal of Chemistry
Redox copolymerization of N-vinyl-2-pyrrolidone (NVP) with methyl methacrylate (MMA) was carried out using titanium(III)-- dimethylglyoxime [Ti(III)-DMG] redox initiator in aqueous sulfuric acid-alcohol media. The resulting copolymer was characterized by FTIR, ^1H-NMR, and ^{13}C-NMR spectroscopic methods and elemental analysis. Thermal properties of the copolymer were determined by differential scanning calorimetric technique and thermogravimetric analysis. The reactivity ratios of the monomers were computed by Fineman-Ross, Kelen-Tudos, and extended Kelen-Tudos methods at lower conversion. The reactivity ratios obtained r_1 (MMA) 1.69 and r_2 (NVP) 0.03 showed richer content of MMA than NVP in the copolymer having extreme ideal behavior. The distribution of monomer …
Design And Synthesis Of New 1,2,4-Triazole Derivatives Containing Morpholine Moiety As Antimicrobial Agents, Deni̇z Şahi̇n, Hacer Bayrak, Ahmet Demi̇rbaş, Nesli̇han Demi̇rbaş, Şengül Alpay Karaoğlu
Design And Synthesis Of New 1,2,4-Triazole Derivatives Containing Morpholine Moiety As Antimicrobial Agents, Deni̇z Şahi̇n, Hacer Bayrak, Ahmet Demi̇rbaş, Nesli̇han Demi̇rbaş, Şengül Alpay Karaoğlu
Turkish Journal of Chemistry
2-Morpholine-4ylethyl-3H-1,2,4-triazole-3-ones (2a, 2b) were obtained from the condensation between the corresponding ethoxycarbonylhydrazones and 2-morpholinoethanamine. 2a was converted to acetohydrazide (4) via the formation of an ester derivative (3). Treatment of 2a and 2b with several aryl sulfonyl chlorides afforded the corresponding 2-arylsulfonyl-1,2,4-triazole-3-ones (5a-c and 6). The reaction of hydrazide (4) with benzyl iso- and benzyl isothiocyanate produced the corresponding carboxamide (8a) and carbothioamide (8b). The basic treatment of 8b yielded 5-mercapto-4H-1,2,4-triazol-3-yl)methyl]-2,4-dihydro-3H-1,2,4-triazol-3-one (10). The synthesis of 1,3-thiazol-2(3H)-ylidene-1,2,4-triazol-1- ylacetohydrazide (11) and 1,3-oxazole-2(3H)-ylidene-1,2,4-triazole- 1-yl)acetohydrazide (9) derivatives was performed from the reaction of 8a and 8b with substituted phenacyl bromides. All the newly synthesized …
Reaction Kinetics Of Carbon Dioxide With 2-Amino-2-Hydroxymethyl-1,3-Propanediol In Aqueous Solution Obtained From The Stopped Flow Method, Cyril Sunday Ume, Erdoğan Alper
Reaction Kinetics Of Carbon Dioxide With 2-Amino-2-Hydroxymethyl-1,3-Propanediol In Aqueous Solution Obtained From The Stopped Flow Method, Cyril Sunday Ume, Erdoğan Alper
Turkish Journal of Chemistry
Carbon dioxide (CO_2) capture has attracted great interest these days due to the role of CO_2 in global warming and its effects in industrial processes. Thus, higher energy efficient and affordable technologies are required for its removal so as to address these problems. In this work, the reaction kinetics of CO_2 with 2-amino-2-hyroxymethyl- 1,3-propanediol (AHPD), a sterically hindered amine (SHA), was studied by direct stopped flow method. The aim was to research CO_2 absorbent with better CO_2 absorption capacity and reaction kinetics than the commonly applied amine solvents. The study was carried out at 288, 298, and 303 K in …
Evaluation Of Thermodynamic Parameters Of Cadmium Adsorption On Sand From Temkin Adsorption Isotherm, Abdul Sattar Ali Khan
Evaluation Of Thermodynamic Parameters Of Cadmium Adsorption On Sand From Temkin Adsorption Isotherm, Abdul Sattar Ali Khan
Turkish Journal of Chemistry
Thermodynamic parameters provide clues for finding the spontaneity of a given process at a given temperature. In the present work, the Temkin adsorption model was applied for evaluation of the thermodynamic parameters of cadmium adsorption studied on sand. The lateral interaction energy parameter was found to be unity, which showed that the heat of adsorption is directly proportional to the fraction of free adsorption sites. The values of \Delta H° and \Delta S° were --4.8 kJ mol^{-1} and 42 J mol^{-1} K^{-1}, respectively. The value of \Delta G° was negative, indicating the spontaneity of cadmium adsorption on sand.
Optimization Of A New Cloud Point Extraction Procedure For The Selective Determination Of Trace Amounts Of Total Iron In Some Environmental Samples, Celal Duran, Duygu Özdeş, Eli̇f Çelenk Kaya, Hali̇t Kanteki̇n, Volkan Numan Bulut, Mehmet Tüfekçi̇
Optimization Of A New Cloud Point Extraction Procedure For The Selective Determination Of Trace Amounts Of Total Iron In Some Environmental Samples, Celal Duran, Duygu Özdeş, Eli̇f Çelenk Kaya, Hali̇t Kanteki̇n, Volkan Numan Bulut, Mehmet Tüfekçi̇
Turkish Journal of Chemistry
A new, simple, and rapid cloud point extraction (CPE) procedure system, combined with flame atomic absorption spectrometry (FAAS), was developed for selective separation, preconcentration, and determination of trace amounts of total iron in some environmental samples. The complexing agent, N,N'-(2,2'-(ethane-1,2-diylbis(oxy)) bis(ethane-2,1-diyl))bis(2-chloroacetamide) (EDBOCA), is selective at pH 5.0 for only Fe(II) and Fe(III) ions in the presence of Cu(II), Pb(II), Cd(II), Mn(II), Co(II), Cr(III), Cr(VI), Ni(II), Zn(II), Al(III), Mo(VI), Pd(II), Pt(IV), Au(III), and V(V) ions. The procedure is based on the complexation of Fe(III) ions with EDBOCA reagent in the presence of Triton X-114 (TX-114) as a non-ionic surfactant. The optimum …
Synthesis, Characterization, And Antioxidant Activities Of New Trisubstituted Triazoles, Kemal Sancak, Yasemi̇n Ünver, Di̇lek Ünlüer, Esra Düğdü, Gülcan Kör, Fati̇h Çeli̇k, Emrah Bi̇ri̇nci̇
Synthesis, Characterization, And Antioxidant Activities Of New Trisubstituted Triazoles, Kemal Sancak, Yasemi̇n Ünver, Di̇lek Ünlüer, Esra Düğdü, Gülcan Kör, Fati̇h Çeli̇k, Emrah Bi̇ri̇nci̇
Turkish Journal of Chemistry
A series of new 4-(3,4dimethoxyphenethyl)-3,5-akyl/aryl-4H- 1,2,4-triazoles (3a-g) were obtained by reaction of ethyl N'-(alkylidene/arylidene)hydrazonate (1) and 2-(3,4-dimethoxy phenyl)ethanamine (2). Compounds 4d, e, and g were synthesized from the reaction of corresponding compounds 3d, e, and g with BBr_3, respectively. The 10 new compounds synthesized were characterized by elemental analyses, IR, ^1H-NMR, and ^{13}C-NMR spectral data. The structure of compound 3g was inferred through IR, ^1H-, ^{13}C-NMR, elemental analyses, and X-ray spectral techniques. In addition, the newly synthesized chemicals were screened for their antioxidant properties. Among the chemicals tested, 4d, e, and g exhibited the highest degree of antioxidant activity.
Silica Nanoparticles As A High Efficient Catalyst For The One-Pot Synthesis Of 3-Oxo-3-Phenylpropanamid Derivatives From Isocyanides, Phenylacetaldehyde And Secondary Amines, Ali Ramazani, Kourosh Dastanra, Fatemeh Zeinali Nasrabadi, Zahra Karimi, Morteza Rouhani, Mehdi Hosseini
Silica Nanoparticles As A High Efficient Catalyst For The One-Pot Synthesis Of 3-Oxo-3-Phenylpropanamid Derivatives From Isocyanides, Phenylacetaldehyde And Secondary Amines, Ali Ramazani, Kourosh Dastanra, Fatemeh Zeinali Nasrabadi, Zahra Karimi, Morteza Rouhani, Mehdi Hosseini
Turkish Journal of Chemistry
Reaction of an isocyanide with an iminium ion intermediate, formed by reaction between 2-oxo-2-phenylacetaldehyde and a secondary amine in the presence of silica nanoparticles, proceeds smoothly at room temperature to afford ketoamide derivatives in high yields.
Transmission Ft-Ir Spectroscopic Analysis Of Human Kidney Stones In The Hyderabad Region Of Pakistan, Muhammad Hussan Khaskheli, Syed Tufail Hussain Sherazi, Huma Mazhar Ujan, Sarfaraz Ahmed Mahesar
Transmission Ft-Ir Spectroscopic Analysis Of Human Kidney Stones In The Hyderabad Region Of Pakistan, Muhammad Hussan Khaskheli, Syed Tufail Hussain Sherazi, Huma Mazhar Ujan, Sarfaraz Ahmed Mahesar
Turkish Journal of Chemistry
The purpose of the present study was to investigate the composition of kidney stones removed from human patients. Seventeen samples were collected after surgery (5 females and 12 males; age range 2 to 60 years). The samples were analyzed for composition by transmission Fourier transform infrared (FT-IR) spectroscopy. The 17 analyzed samples of kidney stones comprised 29.4% calcium oxalate, 29.4% uric acid, 29.4% calcium oxalate (CaOx)-uric acid, 5.9% phosphate, and 5.9% calcium oxalate-phosphate stones. The results of the study indicated that transmission FT-IR spectroscopy could be used as an environmentally friendly technique for rapid screening of kidney stones.
The Reaction Of Dialkyl Acetylenedicarboxylates With 2-Oxo-2-Phenylacetaldehyde In The Presence Of Primary Amines: Synthesis Of Alkyl 2-Benzoyl-4-Alkylamino-5-Oxo-2,5-Dihydro-3-Furan Carboxylate Derivatives, Javad Safaei Ghomi, Fariba Salimi, Ali Ramazani, Fatemeh Zeinali Nasrabadi, Yavar Ahmadi
The Reaction Of Dialkyl Acetylenedicarboxylates With 2-Oxo-2-Phenylacetaldehyde In The Presence Of Primary Amines: Synthesis Of Alkyl 2-Benzoyl-4-Alkylamino-5-Oxo-2,5-Dihydro-3-Furan Carboxylate Derivatives, Javad Safaei Ghomi, Fariba Salimi, Ali Ramazani, Fatemeh Zeinali Nasrabadi, Yavar Ahmadi
Turkish Journal of Chemistry
A 3-component domino reaction approach between a primary amine, a dialkyl acetylenedicarboxylate, and 2-oxo-2- phenylacetaldehyde that affords novel alkyl 2-benzoyl-4-alkylamino- 5-oxo-2,5-dihydro-3-furan carboxylate derivatives is reported. The reaction sequence consists of an initial Michael addition of primary amines to dialkyl acetylenedicarboxylates, followed by an aldol-like reaction with 2-oxo-2-phenylacetaldehyde, and then \gamma -lactonization to afford the products. This cascade reaction sequence represents a rapid and unprecedented route to the described biologically interesting molecules.
Symmetric, Twinned, And Double-Decker Phthalocyanines Substituted By Trialkylated Pentaerythritol, Muzaffer Köç, Ayşe Gül Gürek, Fabienne Dumoulin, Vefa Ahsen
Symmetric, Twinned, And Double-Decker Phthalocyanines Substituted By Trialkylated Pentaerythritol, Muzaffer Köç, Ayşe Gül Gürek, Fabienne Dumoulin, Vefa Ahsen
Turkish Journal of Chemistry
Trialkylated pentaerythritol was chosen as a bulky substituent for a set of 3 free-base phthalocyanines: a symmetric, a twinned, and a double-decker derivative. The bulkiness of this substituent lowered the aggregation of the phthalocyanines. The electronic absorptions were comparatively investigated: the twinned phthalocyanine exhibited a significant near-infrared shifted absorption. The neutral radical Eu(III) complex was oxidized by bromine. These 3 phthalocyanines are promising for use as molecular materials.
A New Absorption Based Co_2 Sensor Based On Schiff Base Doped Ethyl Cellulose, Sevi̇nç Zehra Topal, Kadri̇ye Erteki̇n, Beri̇n Yeni̇gül, Ayşe Erçağ
A New Absorption Based Co_2 Sensor Based On Schiff Base Doped Ethyl Cellulose, Sevi̇nç Zehra Topal, Kadri̇ye Erteki̇n, Beri̇n Yeni̇gül, Ayşe Erçağ
Turkish Journal of Chemistry
This paper reports absorption-based CO_2 sensing of the pH-active Schiff base 2-[(2-hydroxymethylphenylimino) methyl]-5-bromo-phenol (SB) in an ethyl cellulose (EC) matrix with and without Teflon coating. The CO_2 sensitivity of the SB dye in the EC matrix was evaluated in the presence of nonadecafluorodecanoic acid and tetrabutyl ammonium hydroxide. When exposed to CO_2, the sensing films exhibited 76% of overall relative signal change and responded to CO_2 over a wide range: 1%-100 % (v/v). However, the slope of the spectral response between 1% and 5% (v/v) is more significant. The response time (\tau_{90}) was 15 s, and limit of detection (LOD) …
Design, Synthesis, And Biological Evaluation Of Indole-Based 1,4-Disubstituted Piperazines As Cytotoxic Agents, Meri̇ç Köksal Akkoç, Mi̇ne Yarim Yüksel, İrem Durmaz, Rengül Çeti̇n Atalay
Design, Synthesis, And Biological Evaluation Of Indole-Based 1,4-Disubstituted Piperazines As Cytotoxic Agents, Meri̇ç Köksal Akkoç, Mi̇ne Yarim Yüksel, İrem Durmaz, Rengül Çeti̇n Atalay
Turkish Journal of Chemistry
A series of 3-[(4-substitutedpiperazin-1-yl)methyl]-1H-indole derivatives were synthesized, and their structures were confirmed by spectral analysis. All the compounds were tested for their cytotoxic activity in vitro against 3 human tumor cell lines: human liver (HUH7), breast (MCF7), and colon (HCT116). Among the designed derivatives, most of the compounds showed significant cytotoxicity against liver and colon cancer cell lines with lower IC_{50} concentrations than the standard drug 5-fluorouracil. Compound 3s, with 3,4-dichlorophenyl substituent on the piperazine ring, was the most active in suppressing the growth of all screened cancer cells.
Simultaneous Determination Of Dopamine, Uric Acid, And Tryptophan Using An Mwcnt Modified Carbon Paste Electrode By Square Wave Voltammetry, Hadi Beitollahi, Alireza Mohadesi, Saeedeh Khalilizadeh Mahani, Hassan Karimi Maleh, Ali Akbari
Simultaneous Determination Of Dopamine, Uric Acid, And Tryptophan Using An Mwcnt Modified Carbon Paste Electrode By Square Wave Voltammetry, Hadi Beitollahi, Alireza Mohadesi, Saeedeh Khalilizadeh Mahani, Hassan Karimi Maleh, Ali Akbari
Turkish Journal of Chemistry
A highly sensitive method was investigated for the simultaneous determination of dopamine (DA), uric acid (UA), and tryptophan (TRP) using a multiwall carbon nanotubes/5-amino-3',4'-dimethoxy-biphenyl-2-ol modified carbon paste electrode (5ADMBCNPE). The 5ADMBCNPE displayed excellent electrochemical catalytic activities towards the oxidation of DA, UA, and TRP. The electrochemical profile of the proposed modified electrode was analyzed by cyclic voltammetry (CV), which showed a shift in the oxidation peak potential of DA at 160 mV to a less positive value compared with an unmodified carbon paste electrode. Square wave voltammetry (SWV) in 0.1 M phosphate buffer solution (PBS) at pH 7.0 was performed …
Titrimetric Determination Of Anionic Surfactant Content In Anionic/Nonionic Surfactant Mixture Solution By Anionic Surfactant Selective Electrode, Junwei Wang, Zhiping Du, Wanxu Wang, Wei Xue
Titrimetric Determination Of Anionic Surfactant Content In Anionic/Nonionic Surfactant Mixture Solution By Anionic Surfactant Selective Electrode, Junwei Wang, Zhiping Du, Wanxu Wang, Wei Xue
Turkish Journal of Chemistry
A new polyvinyl chloride (PVC) membrane electrode for determining the concentration of sodium dodecylsulfate (SDS) based on a neutral ion pair complex of dodecyltrimethylammonium-dodecylsulfate (DTA^+DS^-) as ionophore is described in this paper. The construction and characteristic performance of the PVC membrane electrode displays a Nernstian slope of --56.9 \pm 0.3 mV/decade in the concentration range of 2.0 \times 10^{-6} to 3.2 \times 10^{-3} mol L^{-1} and a detection limit of 1.6 \times 10^{-6} mol L^{-1}. The lifetime of the electrode is more than 3 months without showing significant change in the values of slope or linear concentration range. The electrode …
Microwave-Assisted Synthesis, Spectroscopy, And Crystal Structures Of [(H_2-(4,4'-Bipy)]^{2+} [Cr_2o_7]^{2-} And One-Dimensional Polymeric {[Mn(4,4'-Bipy)(Cr_2o_7)(H_2o)_2]\}_N Compounds, Hirihattaya Phetmung, Munee Wateh, Chaveng Pakawatchai
Microwave-Assisted Synthesis, Spectroscopy, And Crystal Structures Of [(H_2-(4,4'-Bipy)]^{2+} [Cr_2o_7]^{2-} And One-Dimensional Polymeric {[Mn(4,4'-Bipy)(Cr_2o_7)(H_2o)_2]\}_N Compounds, Hirihattaya Phetmung, Munee Wateh, Chaveng Pakawatchai
Turkish Journal of Chemistry
A compound (1), [H_2-(4,4'-bipy)]^{2+}[(Cr_2O_7)]^{2-} and a metal organic-inorganic coordination framework (2), [Mn(4,4'-bipy)(Cr_2O_77)(H_2O)_2] (4,4'-bipy=4,4' -bipyridine) were successfully synthesized by microwave method. Their characterization was performed by single crystal X-ray crystallography and FT-IR spectroscopy. The crystal structure of 1 revealed a diprotonated 4,4'-bipyridium dichromate compound while compound 2 is an onedimensional (1D) polymer in which (Cr_2O_7)^{2-} acts as a bridging ligand supporting the formation of infinite {[Mn(4,4'-bipy)(Cr_2O_7)(H_2O)_2]}_n polymeric chains. The geometry of the 4,4'-bipy ring in 1 is typical coplanar, but twists in 2. In the free molecule 1, dichromate ligand adopts an eclipsed conformation, but adopts a staggered conformation in complex. …
Reduction, Mannich Reaction And Antimicrobial Activity Evaluation Of Some New 1,2,4-Triazol-3-One Derivatives, Seda Fandakli, Serap Başoğlu, Hakan Bektaş, Meltem Yolal, Ahmet Demi̇rbaş, Şengül Alpay Karaoğlu
Reduction, Mannich Reaction And Antimicrobial Activity Evaluation Of Some New 1,2,4-Triazol-3-One Derivatives, Seda Fandakli, Serap Başoğlu, Hakan Bektaş, Meltem Yolal, Ahmet Demi̇rbaş, Şengül Alpay Karaoğlu
Turkish Journal of Chemistry
Ethyl[4-arylmethyleneamino-3-(4-metylphenyl)-5-oxo-4,5-dihydro- 1H-1,2,4-triazole-1-yl]acetates (3a-e and 10a-d) were obtained starting from 4-amino-2,4-dihydro-3H-1,2,4-triazol-3-ones (1 and 9) in 2 steps. The treatment of 3a-e with NaBH_4 resulted in the formation of 3 kinds of product incorporating carboxcilic acid (4a-c) or alcohol (5a-e) functionality. [4-{[(4-Methoxyphenyl)methylene]amino}- and 4-{[pyridin-4-ylmethylene]amino}-3-(4-methylphenyl)-5-oxo-4,5-dihydro-1H- 1,2,4-triazole-1-yl] acetic acids (6a, 6e) were obtained by the hydrolysis of the corresponding esters (5a-5e). The treatment of 6a with NaBH_4 caused the reduction of only the imine bond; the carboxyl group remained unchanged. Then this carboxylic acid was converted to the corresponding hydrazide (8) in 2 steps by reaction with ethanol and hydrazine hydrate, respectively. The synthesis …
Synthesis And Cytotoxic Evaluation Of Uracil C-Mannich Bases, Hüseyi̇n İstanbullu, Istvan Zupko, Vi̇ldan Alptüzün, Erçi̇n Erci̇yas
Synthesis And Cytotoxic Evaluation Of Uracil C-Mannich Bases, Hüseyi̇n İstanbullu, Istvan Zupko, Vi̇ldan Alptüzün, Erçi̇n Erci̇yas
Turkish Journal of Chemistry
This study covers the design, synthesis, characterization, and cytotoxic activity of a series of uracil C-Mannich bases. Among them, one hybrid compound (1), a molecular combination of the potential antimetabolite substituted uracil and nitrogen mustard, having potential alkylating capability, was prepared as a Mannich base. The other compound was synthesized with the replacement of chlorines in the ethyl chains with hydroxyl groups for testing for anticancer activity. Some of Mannich bases having several amino groups with different pKa values were also synthesized and investigated in terms of cytotoxic activity. Their chemical structures were confirmed by means of their UV, IR, …
Determination Of Lidocaine Based On Electrocatalysis Of A Chemically Modified Electrode, Gamze Tan, Gülçi̇n Bolat, Mehmet Ali̇ Onur, Serdar Abaci
Determination Of Lidocaine Based On Electrocatalysis Of A Chemically Modified Electrode, Gamze Tan, Gülçi̇n Bolat, Mehmet Ali̇ Onur, Serdar Abaci
Turkish Journal of Chemistry
The potential application of biochemically modified electrodes was investigated for construction of a drug biosensor. The electrocatalytic response of lidocaine was examined through modified electrodes using the electron transfer ability of hemoglobin (Hb) immobilized on gold film modified with a self-assembled monolayer (SAM) of 3-mercaptopropionic acid (MPA). According to the results of voltammetric studies, Au/MPA/Hb electrodes exhibited high sensitivity and good electrocatalytic activity for the reduction of lidocaine, motivating us to construct drug biosensors. With this study, a new electroanalytical procedure is proposed for the determination of lidocaine level in medical applications or therapeutic formulations containing lidocaine as the active …
Facile And Rapid Synthesis Of Some Novel Polysubstituted Imidazoles By Employing Magnetic Fe_3o_4 Nanoparticles As A High Efficient Catalyst, Bahador Karami, Khalil Eskandari, Abdolmohammad Ghasemi
Facile And Rapid Synthesis Of Some Novel Polysubstituted Imidazoles By Employing Magnetic Fe_3o_4 Nanoparticles As A High Efficient Catalyst, Bahador Karami, Khalil Eskandari, Abdolmohammad Ghasemi
Turkish Journal of Chemistry
Multicomponent, one-pot, highly efficient, and environmentally adapted synthesis of some novel polysubstituted imidazoles by the use of various aldehydes, benzil, aliphatic, and aromatic primary amines and ammonium acetate in the presence of Fe_3O_4 nanoparticles as catalyst under solvent-free condition is explained. A highly efficient role of Fe_3O_4 nanoparticles as catalyst in this synthesis was shown. By this advantage, several polysubstituted imidazoles as pharmaceutical important molecules can be prepared in high yield and high purity. This method is very easy and rapid for the synthesis of imidazole derivatives. All products were deduced from their IR and NMR spectroscopic data. The Fe_3O_4 …
Determination Of Ultratrace Amounts Of Dichloro-Nitrobenzene And Dichloro-Nitroaniline In Water Samples Using Solidified Floating Organic Drop Microextraction (Sfodme) And Gas Chromatography, Shayessteh Dadfarnia, Mohammad Mirzaei, Ali Mohammad Haji Shabani, Batoul Ramazanzadeh
Determination Of Ultratrace Amounts Of Dichloro-Nitrobenzene And Dichloro-Nitroaniline In Water Samples Using Solidified Floating Organic Drop Microextraction (Sfodme) And Gas Chromatography, Shayessteh Dadfarnia, Mohammad Mirzaei, Ali Mohammad Haji Shabani, Batoul Ramazanzadeh
Turkish Journal of Chemistry
Solidified floating organic drop microextraction (SFODME) in combination with gas chromatography with an electron capture detector was used for separation/enrichment and determination of 2,5-dichloro-nitrobenzene, 2,3-dichloro-nitrobenzene, and 2,6-dichloro-4-nitroaniline in water samples. The main parameters affecting the performance of SFOME, such as solvent volume, extraction time, stirring rate, extraction temperature, sample volume, nature of the solvent and ionic strength were optimized. Under the optimum experimental conditions, good relative standard deviations of 7.5%, 6.9%, and 9.3% for 7 extractions and determination of 50 ng L^{-1} of 2,5-dichloro-nitrobenzene, 2,3-dichloro-nitrobenzene and 2,6-dichloro-4-nitroaniline were obtained, respectively. Enrichment factors of 1390, 1398, and 1362 and detection limits …
Synthesis And Structural Characterization Of Novel Square Pyramidal Oxovanadium(Iv) Complexes With Ligands Having N And O Donor Atoms, Ashok Kumar Yadava, Hardeo Singh Yadav, Uma Shanker Yadav, Devendra Pratap Rao
Synthesis And Structural Characterization Of Novel Square Pyramidal Oxovanadium(Iv) Complexes With Ligands Having N And O Donor Atoms, Ashok Kumar Yadava, Hardeo Singh Yadav, Uma Shanker Yadav, Devendra Pratap Rao
Turkish Journal of Chemistry
Oxovanadium(IV) complexes having the general formula [VO(L)] were designed and synthesized using vanadyl ion as kinetic template with ligands derived by condensation of \beta-diketones such as acetylacetone, benzoylacetone, thenoyltrifluoroacetone, and dibenzoylmethane with 2-amino-3-hydroxypyridine or 2-aminobenzoic acid or 2-aminonicotinic acid. Tentative structures of the complexes were proposed on the basis of elemental analysis, molar conductance, magnetic moments, and spectral (infrared, electronic and electron spin resonance) data. All the oxovanadium(IV) complexes are 5-coordinated wherein derived ligands act as tetradentate chelating agents.