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- 1 (11)
- 2 (9)
- Antimicrobial activity (8)
- 3 (5)
- 4-triazole (4)
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- 4-oxadiazole (3)
- Mannich base (3)
- Michael addition (3)
- N-isocyaniminotriphenylphosphorane (3)
- Synthesis (3)
- 2-oxo-2-phenylacetaldehyde (2)
- 4-thiadiazole (2)
- Amines (2)
- Aromatic carboxylic acid (2)
- Cadmium (2)
- Cyclic voltammetry (2)
- Indole (2)
- Isocyanide (2)
- Nanoparticles (2)
- Preconcentration (2)
- Secondary amine (2)
- Silica nanoparticles (2)
- Tropolone (2)
- 1'-(Naphthalene-1 (1)
- 1-(2-pyridylazo)-2-naphthol (1)
- 1-hexyl-3-methylimidazolium hexafluorophosphate (1)
- 2'-bipyridine (1)
- 2(3H)-benzoxazolone (1)
- 2-(2-styrylcyclopent-3-enyl)benzo-[d]thiazole (1)
- 2-(2-thiazolylazo)-p-cresol (1)
Articles 1 - 30 of 75
Full-Text Articles in Physical Sciences and Mathematics
Properties Of The Mixed Adsorption Layer: Neutral Detergent-Tetramethylthiourea At Interface Electrode/Solution, Jolanta Nieszporek, Dorota Sienko, Dorota Gugala-Fekner, Malgorzata Klin
Properties Of The Mixed Adsorption Layer: Neutral Detergent-Tetramethylthiourea At Interface Electrode/Solution, Jolanta Nieszporek, Dorota Sienko, Dorota Gugala-Fekner, Malgorzata Klin
Turkish Journal of Chemistry
The mixed adsorption layers of tetramethylthiourea and a neutral detergent formed at the electrode surface in 1 M NaClO_4 are described in this paper. The systems were characterized by the measurement of differential capacity, zero charge potential, and surface tension at the same potential. The data were analyzed to obtain the surface pressure and relative surface excess of tetramethylthiourea as a function of electrode charge and bulk concentration of the studied compounds. The values of the lateral interaction parameters, obtained in the presence and in the absence of decanoyl-N-methylglucamide (C_{17}H_{35}NO_6), change differently depending on the isotherm used, but \Delta G° …
A Novel Soluble Phthalocyanine Capable Of Binding Four Boronic Esters, Şennur Özçeli̇k, Gülnur Keser Karaoğlan, Gülşah Gümrükçü, Ahmet Gül
A Novel Soluble Phthalocyanine Capable Of Binding Four Boronic Esters, Şennur Özçeli̇k, Gülnur Keser Karaoğlan, Gülşah Gümrükçü, Ahmet Gül
Turkish Journal of Chemistry
A novel Zn phthalocyanine bearing 4 salicylideniminophenyloxy substituents on peripheral positions was synthesized from the reaction of 4-aminophenoxy substituted phthalocyanine and salicylaldehyde. The condensation reaction of salicylidene Schiff base groups and benzeneboronic acid produced a new phthalocyanine carrying benzeneboronic acid ester derivatives as substituents. Ethoxy groups were bound to boronic acid as a second ligand. The presence of B-N bond interactions enhanced the stability of this boronated phthalocyanine derivative, which exhibited sufficient air stability during the purification and characterization processes. The novel compounds were characterized by using elemental analysis, IR, ^1H-NMR, ^{11}B-NMR, ^{13}C-NMR, UV-Vis and MALDI-TOF MS spectral data.
Synthesis Of Linezolid-Like Molecules And Evaluation Of Their Antimicrobial Activities, Serap Başoğlu, Meltem Yolal, Ahmet Demi̇rbaş, Hakan Bektaş, Rza Abbasoğlu, Nesli̇han Demi̇rbaş
Synthesis Of Linezolid-Like Molecules And Evaluation Of Their Antimicrobial Activities, Serap Başoğlu, Meltem Yolal, Ahmet Demi̇rbaş, Hakan Bektaş, Rza Abbasoğlu, Nesli̇han Demi̇rbaş
Turkish Journal of Chemistry
3-Fluoro-4-(morpholin-4-yl)aniline (2), prepared from 3,4-difluoronitrobenzene, was converted to the corresponding Schiff base (3) by treatment with indol-3-carbaldehyde. The treatment of thiourea 4 and carbothioamide derivatives 9 with ethyl bromoacetate or 4-substituted phenacyl bromides generated the corresponding thiazolidinone (5 and 13) and thiazoline (6 and 12) derivatives, respectively. The acidic or basic treatment of carbothioamide 9 produced 1,3,4-thiadiazole (11) or 1,2,4-triazole (10) compounds, respectively. The structural assignments of the new compounds were based on elemental analysis and spectral (IR, ^1H-NMR, ^{13}C-NMR, and LC-MS) data. The antimicrobial activity study revealed that all compounds showed good antitubercular activities.
Ni_{55} Nanocluster: A Density Functional Theory Study Of The Binding Energy Of Nickel And Ethylene Adsorption, Nusret Duygu Yilmazer, Mehmet Ferdi̇ Fellah, Işik Önal
Ni_{55} Nanocluster: A Density Functional Theory Study Of The Binding Energy Of Nickel And Ethylene Adsorption, Nusret Duygu Yilmazer, Mehmet Ferdi̇ Fellah, Işik Önal
Turkish Journal of Chemistry
Ethylene adsorption on a Ni_{55} nanocluster was studied by means of the density functional theory (DFT)/B3LYP using the basis sets of 6-31G(d,p) and 86-411(41d)G in Gaussian 03. The Ni_{55} nanocluster was found to have a distorted icosahedral geometry, in accordance with the experimental findings. The binding energy value for the Ni_{55} nanocluster was calculated to be 3.51 eV/atom using equilibrium geometry calculations. The estimated bulk nickel binding energy was in reasonable agreement with the experimental value (4.85 versus 4.45 eV/atom). In addition, equilibrium geometry calculations were performed for ethylene adsorption on the Ni_{55} nanocluster for 2 different coordination numbers of …
Synthesis And Structural And Electrochemical Characterization Of Novel Macrocyclic Vic-Dioxime Ligand And Its Mononuclear Transition And Nontransition Metal Complexes, Pervi̇n Deveci̇, Bi̇lge Taner, Zeynel Kiliç, Ali̇ Osman Solak, Emi̇ne Özcan
Synthesis And Structural And Electrochemical Characterization Of Novel Macrocyclic Vic-Dioxime Ligand And Its Mononuclear Transition And Nontransition Metal Complexes, Pervi̇n Deveci̇, Bi̇lge Taner, Zeynel Kiliç, Ali̇ Osman Solak, Emi̇ne Özcan
Turkish Journal of Chemistry
The reaction of N-(4-aminophenyl)aza-15-crown-5 (1) with anti-chlorophenylglyoxime (2) produces a novel azacrown ether containing vic-dioxime, N-(4-aminophenyl)aza-15-crown-5-phenylglyoxime (LH_2). LH_2 reacts with Ni(II), Cu(II), Co(II), Cd(II), and Zn(II) ions to yield the mononuclear transition and nontransition metal complexes [M(LH)_2] (M = Ni and Cu), [M(LH)_2(H_2O)_2] (M = Co), and [M(LH)(H_2O)(Cl)] (M = Cd and Zn). The structural features of LH_2 were studied using several techniques including elemental analysis, Fourier transform infrared spectroscopy (FT-IR), ultraviolet visible (UV-Vis), mass spectrometry (MS), 1-dimensional (1D) ^1H-NMR and ^{13}CNMR, distortionless enhancement by polarization transfer (DEPT) 2-dimensional (2D) heteronuclear single-quantum coherence (HSQC), and heteronuclear multiple-bond correlation (HMBC) techniques. …
Synthesis And Characterization Of Transition Metal Coordination Polymers Derived From 1,4-Benzenedicarboxylate And Certain Azoles, Aref A. M. Aly, Mahmoud Ghandour, Maged S. Alfakeh
Synthesis And Characterization Of Transition Metal Coordination Polymers Derived From 1,4-Benzenedicarboxylate And Certain Azoles, Aref A. M. Aly, Mahmoud Ghandour, Maged S. Alfakeh
Turkish Journal of Chemistry
A series of coordination polymers of the general formula {[M(BDC)(azoles)(H_2O)_m].xH_2O}_n (where M = Co(II), Ni(II), and Cu(II); BDC = 1,4-benzenedicarboxylate; azoles = 2-aminobenzothiazole, 2-aminothiazole, and 2-amino-4-methyl-thiazole; m = 0 or 1; and x = 1 or 2) were prepared and characterized. The complexes were characterized based on elemental analysis, infrared and electronic spectral studies, magnetic measurements, molar conductance, thermal analysis, X-ray diffraction, scanning electron microscopy, and biological activity. Thermogravimetry, derivative thermogravimetry, and differential thermal analysis were used to study the thermal decomposition of the complexes. The kinetic parameters were calculated making use of the Coats-Redfern and Horowitz-Metzger equations.
Synthesis, Characterization, And Antimicrobial Activity Of A New Pyrimidine Schiff Base And Its Cu(Ii), Ni(Ii), Co(Ii), Pt(Ii), And Pd(Ii) Complexes, Mehmet Gülcan, Mehmet Sönmez, İsmet Berber
Synthesis, Characterization, And Antimicrobial Activity Of A New Pyrimidine Schiff Base And Its Cu(Ii), Ni(Ii), Co(Ii), Pt(Ii), And Pd(Ii) Complexes, Mehmet Gülcan, Mehmet Sönmez, İsmet Berber
Turkish Journal of Chemistry
A new Schiff base, {1-[(5-bromo-2-hydroxy-benzylidene)- amino]-4-phenyl-2-thioxo-1,2-dihyro-pyrimidin-5-yl}-phenyl-methanone, was synthesized from N-amino pyrimidine-2-thione and 5-bromsalicylaldehyde. Metal complexes of the Schiff base were prepared from acetate salts of Cu(II), Ni(II), Co(II), Pd(II), and PtCl_2 in methanol. The chemical structures of the Schiff base ligand and its metal complexes were confirmed by spectroscopic analysis. All of the compounds were evaluated for their antimicrobial against 4 gram-positive bacteria, 1 gram-negative bacterium, and 3 yeast strains. The Schiff base and the Cu(II) and Co(II) complexes showed good biological activity against all tested bacteria and yeast strains.
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 …
Three-Component Passerini-Smiles Coupling Reaction Of Aldehydes And Isocyanides With Tropolone Catalyzed By Silica Nanoparticles, Abdolhossain Massoudi, Issa Amini, Ali Ramazani, Fatemeh Zeinali Nasrabadi
Three-Component Passerini-Smiles Coupling Reaction Of Aldehydes And Isocyanides With Tropolone Catalyzed By Silica Nanoparticles, Abdolhossain Massoudi, Issa Amini, Ali Ramazani, Fatemeh Zeinali Nasrabadi
Turkish Journal of Chemistry
The use of Smiles rearrangement in Passerini-type couplings with tropolone allows very straightforward multicomponent formation of \alpha-aryloxy amide derivatives. The 3-component addition of isocyanide to tropolone (2-hydroxy-2,4,6-cycloheptatrien-1-one) and aldehyde in the presence of silica nanoparticles (silica NP, ca. 70 nm) proceeds easily in methanol to form the title compounds in a new Passerini-Smiles-type reaction.
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 …
A One-Pot Efficient Four-Component Reaction For The Synthesis Of 2-(Arylamino)-2-(5-Aryl-1-Ethenyl-1,3,4-Oxadiazol-2-Yl)Propyl Benzoate (Or 4-Bromobenzoate) Derivatives, Mohsen Valizadeh Holagh, Abel Mohammadali Oglu Maharramov, Mirza Aliakbar Oglu Allahverdiyev, Ali Ramazani, Yavar Ahmadi, Fatemeh Zeinali Nasrabadi, Ali Souldozi
A One-Pot Efficient Four-Component Reaction For The Synthesis Of 2-(Arylamino)-2-(5-Aryl-1-Ethenyl-1,3,4-Oxadiazol-2-Yl)Propyl Benzoate (Or 4-Bromobenzoate) Derivatives, Mohsen Valizadeh Holagh, Abel Mohammadali Oglu Maharramov, Mirza Aliakbar Oglu Allahverdiyev, Ali Ramazani, Yavar Ahmadi, Fatemeh Zeinali Nasrabadi, Ali Souldozi
Turkish Journal of Chemistry
Reactions of N-isocyaniminotriphenylphosphorane with 2-oxopropyl benzoate (or 2-oxopropyl 4-bromobenzoate) in the presence of 3-phenyl-2-propynoic acid and primary amines proceeded smoothly at room temperature and in neutral conditions to afford sterically congested 1,3,4-oxadiazole derivatives in high yields. The reaction proceeded smoothly and cleanly under mild conditions and no side reactions were observed.
Synthesis And Structural X-Ray Analysis Of 1,1'-(Naphthalene-1,8-Diyl)-3,3'-Dibenzoyl-Bisthiourea And Its Use As Anion-Binding Receptor, Fatma Aydin, Nazan Tunoğlu, Doğan Aykaç, Nahi̇de Burcu Arslan, Canan Kazak
Synthesis And Structural X-Ray Analysis Of 1,1'-(Naphthalene-1,8-Diyl)-3,3'-Dibenzoyl-Bisthiourea And Its Use As Anion-Binding Receptor, Fatma Aydin, Nazan Tunoğlu, Doğan Aykaç, Nahi̇de Burcu Arslan, Canan Kazak
Turkish Journal of Chemistry
A novel artificial receptor, 1,1'-(naphthalene-1,8-diyl)-3,3'- dibenzoyl-bisthiourea, based on a 1,8-naphthalene skeleton bearing bisthiourea groups was prepared and characterized by IR and ^1H-NMR, ^{13}C-NMR, and MS spectroscopic techniques. The compound proved to be an efficient and selective naked-eye detector for the fluoride, cyanide, and hydroxide ions in DMSO. The crystal structure of the title compound was examined by using X-ray crystallographic techniques and found to be crystallized in the monoclinic space group P -1 with the unit cell parameters: a = 8.1556(8) Å, b = 12.0127(11) Å, c = 13.2081(11) Å, \alpha = 109.510(7)°, \beta = 95.390(7)°, \gamma = 103.660(7)°, Z …
Four-Component Synthesis Of 1,3,4-Oxadiazole Derivatives From N-Isocyaniminotriphenylphosphorane, Aromatic Carboxylic Acids, Aromatic Bis-Aldehydes, And Secondary Amines, Ali Ramazani, Zahra Karimi, Ali Souldozi, Yavar Ahmadi
Four-Component Synthesis Of 1,3,4-Oxadiazole Derivatives From N-Isocyaniminotriphenylphosphorane, Aromatic Carboxylic Acids, Aromatic Bis-Aldehydes, And Secondary Amines, Ali Ramazani, Zahra Karimi, Ali Souldozi, Yavar Ahmadi
Turkish Journal of Chemistry
The 1:1 iminium intermediate generated by the addition of a secondary amine to aromatic bis-aldehydes (isophthalaldehyde and terphthalaldehyde) is trapped by the N-isocyaniminotriphenylphosphorane in the presence of a aromatic carboxylic acid derivative, which leads to the formation of corresponding iminophosphorane intermediate. Then disubstituted 1,3,4-oxadiazole derivatives are formed via intramolecular aza-Wittig reaction of the iminophosphorane intermediates. The reactions were completed in neutral conditions at room temperature and the corresponding disubstituted 1,3,4-oxadiazole derivatives were produced in excellent yields.
Synthesis Of The Novel Benzothiazole Compounds From 7-Benzylidenebicyclo [3.2.0] Hept-2-En-6-Ones And 2-Aminobenzenethiol, Esra Findik
Turkish Journal of Chemistry
Synthesis of the 2-(2-styrylcyclopent-3-enyl)benzo-[d]thiazoles (6a-i) is reported for the first time. Reaction of 7-benzylidenebicyclo [3.2.0] hept-2-en-6-ones (3a-i) and 2-aminobenzenethiol (4) in the presence of p-TsOH as a catalyst, in ethanol under reflux, resulted in the formation of novel 2-(2-styrylcyclopent-3-enyl)benzo[d]thiazoles in high yields.
Hydrothermal Synthesis And Characterization Of Nanosized Transition Metal Chromite Spinels, Shahid Khan Durrani, Syed Zahid Hussain, Khalid Saeed, Yaqoob Khan, Mohammad Arif, Nisar Ahmed
Hydrothermal Synthesis And Characterization Of Nanosized Transition Metal Chromite Spinels, Shahid Khan Durrani, Syed Zahid Hussain, Khalid Saeed, Yaqoob Khan, Mohammad Arif, Nisar Ahmed
Turkish Journal of Chemistry
Homogeneous crystalline transition metal chromite spinels (MCr_2O_4, where M = Co, Mn, and Ni) were prepared by hydrothermal reaction of aqueous solutions containing the respective metal nitrate, chromium(III) nitrate, and sodium hydroxide in stoichiometric amounts at 180-200 °C and pH 10.5-11.5 for 11-13 h. The crystalline structure, microstructure, and thermal stability of the synthesized chromite products were analyzed by X-ray diffraction (XRD), scanning electron microscopy, thermogravimetry, and differential thermal analysis. The analysis results revealed that the CoCr_2O_4 and MnCr_2O_4 crystalline phases were thermally stable in the range of 750-800 °C. UV-visible studies showed that higher characteristic bands corresponded to the …
Comparative Photodecolorization Of Red Dye By Anatase, Rutile (Tio_2), And Wurtzite (Zno) Using Response Surface Methodology, Shahab Khameneh Asl, Sayad Khatib Sadrnezaad, Mansour Keyanpour-Rad, Deni̇z Üner
Comparative Photodecolorization Of Red Dye By Anatase, Rutile (Tio_2), And Wurtzite (Zno) Using Response Surface Methodology, Shahab Khameneh Asl, Sayad Khatib Sadrnezaad, Mansour Keyanpour-Rad, Deni̇z Üner
Turkish Journal of Chemistry
Treatment of dye pollution containing C.I. Acid Red 14 (AR14) by a coupled photocatalytic process was studied. Titanium dioxide, in the form of anatase and rutile, and zinc oxide, were used as photocatalysts. The investigated photocatalysts were Aldrich-produced nanopowders with crystallites of a mean size of 20-30 nm and a specific surface area of about 50 m^2/g. A comparison of TiO_{2(anatase)}, TiO_{2(rutile)}, TiO_{2(a,r)}, and ZnO for the decolorization of the AR14 solution was performed. Results showed that color removal followed the decreasing order of TiO_{2(a,r)}, ZnO > TiO_{2(a,r)} > TiO_{2(a)}, ZnO > TiO_{2(r)}, ZnO >TiO_{2(a,r)} > TiO_{2(a)} > ZnO > TiO_{2(r)}. Response surface methodology (RSM) was …
Solvent-Free Michael Addition Of 2-Cyclohexenone Under Ultrasonic Irradiation In The Presence Of Long Chain Dicationic Ammonium Salts, Aytek Öge, Murat Emrah Mavi̇ş, Çi̇ğdem Yolaçan, Feray Aydoğan
Solvent-Free Michael Addition Of 2-Cyclohexenone Under Ultrasonic Irradiation In The Presence Of Long Chain Dicationic Ammonium Salts, Aytek Öge, Murat Emrah Mavi̇ş, Çi̇ğdem Yolaçan, Feray Aydoğan
Turkish Journal of Chemistry
Long chain dicationic ammonium salts (1a-1c), easily prepared from tert-amines and dihaloalkanes, were successfully used as efficient phase-transfer catalysts in the Michael addition reaction of various active methylene compounds to 2-cyclohexenone without solvent under ultrasonic irradiation. The investigated dicationic salts were more effective than monocationic tetrabutylammonium bromide, with short reaction times and high yields. This methodology was established under phase-transfer catalytic conditions and ultrasonic effects with many advantages, including the easy and cost-effective synthesis of the catalyst, mild reaction conditions, short reaction times, good yields, simple work-up procedures, and environmental friendliness.
A Dft Study On The Structural And Optical Properties And Cation Selectivities Of Some Metal-Coumarin-Crown Ether Complexes, Emi̇ne Esra Kasapbaşi, Mi̇ne Yurtsever
A Dft Study On The Structural And Optical Properties And Cation Selectivities Of Some Metal-Coumarin-Crown Ether Complexes, Emi̇ne Esra Kasapbaşi, Mi̇ne Yurtsever
Turkish Journal of Chemistry
Macrocyclic ethers are well-known molecules because of their high cation-binding capacities. They form stable complexes with alkaline and soil alkaline metals through strong oxygen bridges in solution. For enhanced optical properties, a new series of crown ethers was synthesized with a coumarin ring fused to it. The effects of the position of the coumarin ring, the type of the substituent on the coumarin ring, and the size of the crown on the optical properties of the material were studied according to the density functional theory (DFT) method at the B3LYP/6-31g(d) level of theory in the gas phase as well as …
Surfactant-Sensitized Spectrophotometric Determination Of Hg(Ii) In Water Samples Using 2-(2-Thiazolylazo)- P-Cresol As Ligand And Cetylpyridinium Chloride As Cationic Surfactant, Ramazan Gürkan, Tuğba Çepken, Hali̇l İbrahi̇m Ulusoy
Surfactant-Sensitized Spectrophotometric Determination Of Hg(Ii) In Water Samples Using 2-(2-Thiazolylazo)- P-Cresol As Ligand And Cetylpyridinium Chloride As Cationic Surfactant, Ramazan Gürkan, Tuğba Çepken, Hali̇l İbrahi̇m Ulusoy
Turkish Journal of Chemistry
A new, reliable, surfactant-sensitized method is described for the spectrophotometric determination of total and dissolved inorganic mercury at trace levels. The method is based on the ternary complex formation of Hg(II) with 2-(2-thiazolylazo)-p-cresol and a cationic surfactant, cetylpyridinium chloride, at pH 9.5. The detection and quantification limits of the method with surfactant were 6 and 19 \mu g L^{-1}, while those of the method without surfactant were 22 and 67 \mu g L^{-1}, respectively. The method obeys Beer's law at up to approximately 10 mg L^{-1} Hg(II) in an aqueous surfactant medium. The relative errors and relative standard deviations of …
One-Pot Synthesis Of Fully Substituted 1,3,4-Oxadiazole Derivatives From Aromatic Carboxylic Acids, Cyclobutanone And N-Isocyaniminotriphenylphosphorane, Mohsen Valizadeh Holagh, Abel Mohammadali Oglu Maharramv, Mirza Aliakbar Oglu Allahverdiyev, Ali Ramazani, Yavar Ahmadi, Ali Souldozi
One-Pot Synthesis Of Fully Substituted 1,3,4-Oxadiazole Derivatives From Aromatic Carboxylic Acids, Cyclobutanone And N-Isocyaniminotriphenylphosphorane, Mohsen Valizadeh Holagh, Abel Mohammadali Oglu Maharramv, Mirza Aliakbar Oglu Allahverdiyev, Ali Ramazani, Yavar Ahmadi, Ali Souldozi
Turkish Journal of Chemistry
Reactions of N-isocyaniminotriphenylphosphorane with cyclobutanone in the presence of aromatic (or heteroaromatic) carboxylic acids proceeded smoothly at room temperature and in neutral conditions to afford sterically congested 1-(5-aryl-1,3,4-oxadiazol-2-yl)- 1-cyclobutanol derivatives in high yields. The reaction proceeded smoothly and cleanly under mild conditions and no side reactions were observed. The structures of the products were deduced from their IR, ^1HNMR, and ^{13}CNMR spectra, and mass spectrometry.
Synthesis, Characterization, And Microwave-Promoted Catalytic Activity Of Novel Benzimidazole Salts Bearing Silicon-Containing Substituents In Heck-Mizoroki And Suzuki-Miyaura Cross-Coupling Reactions Under Aerobic Conditions, Hasan Küçükbay, Ni̇hat Şi̇reci̇, Ülkü Yilmaz, Selma Deni̇z, Mehmet Akkurt, Zeli̇ha Baktir, Orhan Büyükgüngör
Synthesis, Characterization, And Microwave-Promoted Catalytic Activity Of Novel Benzimidazole Salts Bearing Silicon-Containing Substituents In Heck-Mizoroki And Suzuki-Miyaura Cross-Coupling Reactions Under Aerobic Conditions, Hasan Küçükbay, Ni̇hat Şi̇reci̇, Ülkü Yilmaz, Selma Deni̇z, Mehmet Akkurt, Zeli̇ha Baktir, Orhan Büyükgüngör
Turkish Journal of Chemistry
A number of benzimidazole derivatives (1-8) were synthesized and the catalytic activity of these compounds in a catalytic system including Pd(OAc)_2 and K_2CO_3 in DMF-H_2O was evaluated in Heck-Mizoroki and Suzuki-Miyaura cross-coupling reactions of aryl iodides, bromides, and chlorides with styrene and arylboronic acids under microwave irradiation and aerobic conditions. The yields of both the Heck-Mizoroki and the Suzuki-Miyaura cross coupling reactions with aryl iodides and aryl bromides were nearly quantitative. The synthesized 1-substituted benzimidazole (1) and benzimidazole salts (2-8) were identified by ^1H- and ^{13}C-NMR and IR spectroscopic methods, and micro analysis. The molecular structure of 7 was also …
Theory Of Adsorption Equilibria Analysis Based On General Equilibrium Constant Expression, Abdul Sattar Ali Khan
Theory Of Adsorption Equilibria Analysis Based On General Equilibrium Constant Expression, Abdul Sattar Ali Khan
Turkish Journal of Chemistry
Adsorption equilibria were analyzed on the basis of general equilibrium constant expression for the development of fundamental adsorption equations (Freundlich, Langmuir, and BET) in connection with the establishment of a general approach towards physical interpretations of adsorption parameters. Theoretically it was proved that Freundlich plot analysis cannot be used to find useful parameters such as the monolayer adsorption capacity of an adsorbent. The present theory also indicated that the adsorption process with known value of monolayer adsorption capacity can be studied for finding various equilibrium constants on the basis of the Fronaeus equation, which is commonly used in the complexation …
Preparation And Antimicrobial Activity Evaluation Of Some Quinoline Derivatives Containing An Azole Nucleus, Muhammet Özyanik, Serpi̇l Demi̇rci̇, Hakan Bektaş, Nesli̇han Demi̇rbaş, Ahmet Demi̇rbaş, Şengül Alpay Karaoğlu
Preparation And Antimicrobial Activity Evaluation Of Some Quinoline Derivatives Containing An Azole Nucleus, Muhammet Özyanik, Serpi̇l Demi̇rci̇, Hakan Bektaş, Nesli̇han Demi̇rbaş, Ahmet Demi̇rbaş, Şengül Alpay Karaoğlu
Turkish Journal of Chemistry
Quinoline-2-carbohydrazide (2) obtained from quinaldic acid (1) was converted to the corresponding carbothioamide 3 and carboxamide 6 by treatment with benzyliso(thio)cyanate. The basic treatment of 3 and 6 yielded the corresponding 1,2,4-triazole derivatives 4 and 7. The synthesis of 5-(quinolin-2-yl)-1,3,4- oxadiazol-2-thiol (9) was performed from the reaction of 1 with CS_2 in basic media. The Mannich reaction of compounds 4, 7, and 9 resulted in the formation of aminoalkylated derivatives 5a-c, 8, and 10a,b. The condensation of 1 with thiosemicarbazide, carbohydrazide, or thiocarbohydrazide gave the corresponding 1,2,4-triazole derivatives (11-13). The treatment of 4-amino-5-(quinolin-2-yl)- 4H-1,2,4-triazole-3-thiol (13) with 4-chlorophenacyl bromide caused the …
Determination Of Cadmium In High Salt Content Matrices By Flow Injection Cold Vapor Atomic Absorption Spectrometry, Orkun Alp, Hakan Demi̇röz, Osman Yavuz Ataman, Nusret Ertaş
Determination Of Cadmium In High Salt Content Matrices By Flow Injection Cold Vapor Atomic Absorption Spectrometry, Orkun Alp, Hakan Demi̇röz, Osman Yavuz Ataman, Nusret Ertaş
Turkish Journal of Chemistry
Flow injection cold vapor atomic absorption spectrometry (FI-CVAAS) was used for determination of cadmium in high salt matrices such as dialysis concentrates and textile leach solutions. The parameters such as acidity, concentration of reducing agent, reaction coil length, and carrier gas flow rate were investigated to obtain the best sensitivity. No significant background signal was observed even at high salt concentrations. Under the optimized conditions the limit of detection value (3s_b m^{-1}, where s_b is the standard deviation of the blank signals and m is the slope of the calibration graph) was found to be 0.05 ng mL^{-1} for an …
^{99m}Tc Labeled Levofloxacin As An Infection Imaging Agent: A Novel Method For Labeling Levofloxacin Using Cysteine\Cdot Hcl As Co-Ligand And In Vivo Study, Syed Ali Raza Naqvi, Malik Muhammad Ishfaq, Zulfiqar Ali Khan, Saeed Ahmad Nagra, Iftikhar Hussain Bukhari, Abdullah Ijaz Hussain, Nasir Mahmood, Sohail Anjum Shahzad, Asma Haque, Tanveer Hussain Bokhari
^{99m}Tc Labeled Levofloxacin As An Infection Imaging Agent: A Novel Method For Labeling Levofloxacin Using Cysteine\Cdot Hcl As Co-Ligand And In Vivo Study, Syed Ali Raza Naqvi, Malik Muhammad Ishfaq, Zulfiqar Ali Khan, Saeed Ahmad Nagra, Iftikhar Hussain Bukhari, Abdullah Ijaz Hussain, Nasir Mahmood, Sohail Anjum Shahzad, Asma Haque, Tanveer Hussain Bokhari
Turkish Journal of Chemistry
Levofloxacin was labeled with ^{99m}Tc using cysteine\cdot HCl as co-ligand and SnCl_2.2H_2O as reducing agent. The influence of various parameters such as amount of cysteine\cdot HCl, reducing agent, pH value, and reaction time on labeling process was studied. After optimizing the conditions the labeling was performed at pH 5 using 1 mg of levofloxacin, 500 \mu g of cysteine\cdot HCl, 50 \mu g of SnCl_2.2H_2O, and 15 min reaction time. The radiochemical purity was determined with the help of instant thin layer chromatography (ITLC) and reverse phase high performance liquid chromatography (RP-HPLC) which was more than 95% and was stable …
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.
Antimicrobial Properties And Dna Interactions Studies Of 3-Hetarylazoquinoline-2,4-Diol Compounds, Fatma Öztürk, Leyla Açik, İzzet Şener, Fi̇kret Karci, Emi̇ne Kiliç
Antimicrobial Properties And Dna Interactions Studies Of 3-Hetarylazoquinoline-2,4-Diol Compounds, Fatma Öztürk, Leyla Açik, İzzet Şener, Fi̇kret Karci, Emi̇ne Kiliç
Turkish Journal of Chemistry
The purpose of the present study was to evaluate the antimicrobial effects of 3-hetarylazoquinoline-2,4-diols (19), having substituted or unsubstituted thiazole, benzothiazole, benzimidazole, triazole, isoxazole, and thiadiazole moieties at the 3-position, on bacterial and yeast strains. In addition, compounds and DNA interaction with pUC18 plasmid DNA were studied. The biological effects of these molecules were compared with potential antibiotics ampicillin,~chloramfenicol (for bacteria), and ketoconozole (for yeast). According to the results, all compounds except 8 have mild to moderate activity against some of the bacterial strains tested, and none of the compounds have activity against the fungi C. tropicalis and C. albicans. …
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 …
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 …