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Full-Text Articles in Physical Sciences and Mathematics
Synthesis, Spectroscopic Characterization, And Biological Screening Of Binuclear Transition Metal Complexes Of Bicompartmental Schiff Bases Containing Indole And Resorcinol Moieties, Mahendra Raj Karekal, Mruthyunjayaswamy Bennikallu Hire Mathada
Synthesis, Spectroscopic Characterization, And Biological Screening Of Binuclear Transition Metal Complexes Of Bicompartmental Schiff Bases Containing Indole And Resorcinol Moieties, Mahendra Raj Karekal, Mruthyunjayaswamy Bennikallu Hire Mathada
Turkish Journal of Chemistry
A series of binucleating Cu(II), Ni(II), and Zn(II) complexes of bicompartmental ligands with ONO donors were prepared. The ligands were synthesized by the condensation of 5-substituted-3-phenyl-1H-indole-2-carboxyhydrazides and 4,6-diacetylresorcinol. The newly synthesized ligands and their complexes were characterized by elemental analysis and various spectral studies like IR, ^1H NMR, ESI-mass, UV-Vis, ESR, thermal studies, magnetic susceptibility, molar conductance, and powder-XRD data. All the complexes were binuclear and monomeric in nature. Cu(II) complexes have octahedral geometry, whereas Ni(II) and Zn(II) complexes have square planar and tetrahedral geometry, respectively. The redox property of the Cu(II) complex was investigated by electrochemical method using cyclic …
Determination And Evaluation Of Gross Alpha And Beta Activity Concentrations And Metal Levels In Thermal Waters From Ankara, Turkey, Orhan Acar, Orhan Murat Kalfa, Özcan Yalçinkaya, Ali̇ Rehber Türker
Determination And Evaluation Of Gross Alpha And Beta Activity Concentrations And Metal Levels In Thermal Waters From Ankara, Turkey, Orhan Acar, Orhan Murat Kalfa, Özcan Yalçinkaya, Ali̇ Rehber Türker
Turkish Journal of Chemistry
The gross \alpha and \beta activity concentrations in the thermal waters of Karakaya-Ayaş, İçmece-Ayaş, Beypazarı (Dutluk-Tahtalı), Haymana, and Kızılcahamam spas in Ankara Province were measured by MPC-9604 multi-detector \alpha /\beta counting system. Ranges of activity concentrations found were from 0.09 to 2.58 Bq L^{-1} for gross \alpha and from 0.25 to 2.61 Bq L^{-1} for gross \beta . The ranges of minimum detectable concentrations for gross \alpha (0.05--0.41 Bq L^{-1}) and for gross \beta (0.04--0.29 Bq L^{-1}) were obtained. Gross \alpha and \beta activity concentrations found in samples were compared with the recommended guidelines of the World Health Organization and …
Synthesis And Biological Activities Of Methylenebis-4h-1,2,4-Triazole Derivatives, Yildiz Uygun, Hacer Bayrak, Havva Özkan
Synthesis And Biological Activities Of Methylenebis-4h-1,2,4-Triazole Derivatives, Yildiz Uygun, Hacer Bayrak, Havva Özkan
Turkish Journal of Chemistry
5,5'-Methylenebis(4--phenyl-4H-1,2,4-triazole-3-thiol) (2) was synthesized starting from hydrazinecarbothioamide compound (1). Treatment of compound 2 with ethyl bromoacetate produced diethyl 5,5'-{methylenebis[(4-phenyl-4H-1,2,4-triazole-5,3-diyl)thio]}diacetate (3), which was converted to the corresponding diacetohydrazide derivative (4) by treatment with hydrazine hydrate. The reaction of compound 4 with several aldehydes produced the corresponding arylidene hydrazides, 5a--d. Syntheses of Mannich bases 6a--c were carried out by the treatment of compound 2 with several amines in the presence of formaldehyde. (4{[5-({5-[(4-Amino-2-chlorophenyl)thio]-4-phenyl-4H-1,2,4-triazol-3-ylmethyl)-4-phenyl-4H-1,2,4-triazol-3-yl]thio}-3-chlorophenyl)amine (8) was prepared by reduction of 2 nitro groups of 3,3' -methylenebis{5-[(2-chloro-4-nitrophenyl)thio]-4-phenyl-4H-1,2,4-triazole} (7) that were obtained from the condensation of 2} with 3,4-dichloronitrobenzene. The newly synthesized compounds were screened …
Aerosol-Assisted Chemical Vapor Deposition Of Copper Sulfide Nanostructured Thin Film From Newly Synthesized Single-Source Precursor, Sohail Saeed, Naghmana Rashid, Khurram Shahzad Ahmad
Aerosol-Assisted Chemical Vapor Deposition Of Copper Sulfide Nanostructured Thin Film From Newly Synthesized Single-Source Precursor, Sohail Saeed, Naghmana Rashid, Khurram Shahzad Ahmad
Turkish Journal of Chemistry
The copper(II) complex of N-[ethyl(butyl)carbamothioyl]- 3,5-dinitrobenzamide (1) has been synthesized and characterized by elemental analysis, IR spectroscopy, and atmospheric pressure chemical ionization-mass spectrometry. Thermogravimetric analysis shows that complex 2 decomposes in 2 steps to form copper sulfide. The complex was used as a single-source precursor for the deposition of copper sulfide thin film by aerosol-assisted chemical vapor deposition at 350 °C. The powder X-ray diffraction pattern of thin film of the complex showed the deposition of monoclinic roxbyite Cu_7S_4 and orthorhombic anilite Cu_7S_4 phases at 350 °C with spherical crystallites. The degree of film surface roughness was determined by atomic …
Palladium-Edta And Palladium-Edteh_4 Catalyzed Heck Coupling Reactions In Pure Water, Süleyman Gülcemal, Beki̇r Çeti̇nkaya
Palladium-Edta And Palladium-Edteh_4 Catalyzed Heck Coupling Reactions In Pure Water, Süleyman Gülcemal, Beki̇r Çeti̇nkaya
Turkish Journal of Chemistry
Palladium-catalyzed Heck coupling reactions of styrene with bromoarene derivatives are carried out under aerobic conditions in water using water-soluble N,N,N',N'-tetrakis(2-hydroxyethyl)ethylenediamine (EdteH_4) and ethylenediaminetetraacetic acid disodium salt (Na_2EDTA) as ligands. The effect of different bases, catalyst loading, and additives is also monitored. The olefination of bromoarenes with styrene affords the desired products in high yields. The Na_2PdCl_4-Na_2EDTA precatalyst system is also used for the preparative scale (50.0 mmol) synthesis of 4-acetyl-trans-stilbene and 4-styrylbenzaldehyde without a noticeable decrease in the activity. Recycling studies on the Na_2PdCl_4 - Na_2EDTA precatalyst system are also tested in the coupling of 4-bromoacetophenone with styrene.
Molecular Mechanism Of Diels--Alder Reaction Between (E)-3,3,3-Trichloro-1-Nitropropene And Cyclopentadiene: B3lyp/6-31g(D) Computational Study, Radomir Jasinski, Andrzej Baranski
Molecular Mechanism Of Diels--Alder Reaction Between (E)-3,3,3-Trichloro-1-Nitropropene And Cyclopentadiene: B3lyp/6-31g(D) Computational Study, Radomir Jasinski, Andrzej Baranski
Turkish Journal of Chemistry
Analysis of reactivity indexes supports the polar character of the reaction between (E)-3,3,3-trichloro-1-nitropropene and cyclopentadiene. This is confirmed by the analysis of electronic properties of transition complexes involved in the reaction paths using the B3LYP/6-31G(d) algorithm. The transition state's asymmetry is large, but it is insufficient to provoke a zwitterionic reaction mechanism. Attempts to find a heterocyclic intermediate 7 in the reaction path ultimately leading to 5-endo-nitro-6-exo-trichloromethylnorbornene 3 have been unsuccessful.
Synthesis, Characterization, And Dft Calculation Of A Pd(Ii) Schiff Base Complex, Alireza Akbari, Zahra Alinia
Synthesis, Characterization, And Dft Calculation Of A Pd(Ii) Schiff Base Complex, Alireza Akbari, Zahra Alinia
Turkish Journal of Chemistry
The 4-((E)-(2-((E)-2, 4-dihydroxybenzylideneamino) ethylimino) methyl) benzene-1,3-diol tetradentate ligand, H_2L, reacted with PdCl_2 to produce the related complex. The complex was characterized by elemental analysis, infrared and electronic spectroscopy, thermogravimetric study, and molar conductance. Furthermore, the fully optimized geometries were calculated using the ADF 2009.01 package. Comparison between the calculated and experimental results covering molecular structures, assignment of fundamental vibrational modes, and thermodynamic properties were investigated. The optimized molecular geometries were compared with the experimental data obtained from X-ray data of a similar complex, which indicated that the theoretical results agree with the corresponding experimental values. The UV-Vis spectrum of the …
Synthesis, Characterization, And Fluorescence Study Of Phthalhydrazidylazo Derivative Of An Unsaturated Diketone And Its Metal Complexes, Radhika Pallikkavil, Muhammed Basheer Ummathur, Krishnannair Krishnankutty
Synthesis, Characterization, And Fluorescence Study Of Phthalhydrazidylazo Derivative Of An Unsaturated Diketone And Its Metal Complexes, Radhika Pallikkavil, Muhammed Basheer Ummathur, Krishnannair Krishnankutty
Turkish Journal of Chemistry
The coupling of diazotized luminol with the unsaturated diketone 1,7-diphenylhepta-4,6-diene-1,3-dione yielded a new type of tridentate ligand (H_2L). Analytical, IR, ^1H NMR, and mass spectral data indicate the existence of the compound in the intramolecularly hydrogen-bonded keto-hydrazone tautomeric form. Dibasic tridentate coordination of the compound in its [ML(H_2O)] complexes [M = Cu(II), Ni(II) and Zn(II)] was established on the basis of analytical and spectral data. The Ni(II) and Zn(II) chelates are diamagnetic while Cu(II) complex showed normal paramagnetic moment. The fluorescence maxima of the compound in different solvents show that the emission wavelength increases with increases in the polarity of …
Synthesis Of Tetrakis(Carboxyphenyl)Porphyrin Coated Paramagnetic Iron Oxide Nanoparticles Via Amino Acid For Photodegradation Of Methylene Blue, Rahmatollah Rahimi, Azadeh Tadjarodi, Mina Imani, Mahboubeh Rabbani, Samaneh Safalou Moghaddam, Hamed Kerdari
Synthesis Of Tetrakis(Carboxyphenyl)Porphyrin Coated Paramagnetic Iron Oxide Nanoparticles Via Amino Acid For Photodegradation Of Methylene Blue, Rahmatollah Rahimi, Azadeh Tadjarodi, Mina Imani, Mahboubeh Rabbani, Samaneh Safalou Moghaddam, Hamed Kerdari
Turkish Journal of Chemistry
In this paper, synthesis of tetrakis(carboxyphenyl)porphyrin (TCPP) coated cadmium ferrite (CdFe_2O_4) nanoparticles by using L-lysine as an anchor is reported for the first time. The ferrimagnetic CdFe_2O_4 nanoparticles were prepared via the facile self-assembly method of reflux followed by a heating treatment. The obtained magnetic nanoparticles were coated with TCPP in the presence of the amino acid L-lysine by sonication in ethanol and then refluxing for 12 h. The structural characteristics of the products were determined using FT-IR and XRD pattern. Scanning electron microscopy (SEM) images indicated uniform morphologies of the magnetic nanoparticles with an average size of 43 nm. …
Simple And Convenient Preparation Of Novel 6,8-Disubstituted Quinoline Derivatives And Their Promising Anticancer Activities, Sali̇h Ökten, Osman Çakmak, Ramazan Erenler, Önem Yüce Şahi̇n, Şaban Teki̇n
Simple And Convenient Preparation Of Novel 6,8-Disubstituted Quinoline Derivatives And Their Promising Anticancer Activities, Sali̇h Ökten, Osman Çakmak, Ramazan Erenler, Önem Yüce Şahi̇n, Şaban Teki̇n
Turkish Journal of Chemistry
A short and easy route is described for 6,8-disubstituted derivatives of quinoline and 1,2,3,4-tetrahydroquinoli- ne from 6,8-dibromoquinolines 2 and 7 by various substitution reactions. While copper-promoted substitution of 6,8-dibromide 2 produced monomethoxides 3 and 4, a prolonged reaction time mainly afforded dimethoxide 6 instead of 5, whose aromatization with DDQ and substitution reaction of dibromide 7 with NaOMe in the presence of CuI also gave rise to dimethoxide 6. Several 6,8-disubstituted quinolines were obtained by treatment of 6,8-dibromoquinoline (7) with n-BuLi followed by trapping with an electrophile [Si(Me)_3Cl, S_2(Me)_2, and DMF]. Furthermore, 7 was also converted to mono and dicyano …
Synthesis Of New N-[3-(Benzo[D]Thiazol-2-Yl)-4-Methylthiazol-2(3h)-Ylidene] Substituted Benzamides, Aamer Saeed, Hummera Rafique
Synthesis Of New N-[3-(Benzo[D]Thiazol-2-Yl)-4-Methylthiazol-2(3h)-Ylidene] Substituted Benzamides, Aamer Saeed, Hummera Rafique
Turkish Journal of Chemistry
A series of novel N-[3-(2-benzo[d]thiazol-2-yl)-4-methylthiazol-2(3H)-ylidene] substituted benzamides (2a--k) were efficiently synthesized by heterocyclization of the corresponding 1-(benzo[d]thiazol-2-yl)-3-aroylthioureas (1a--k). The cyclization was achieved by the reaction of \alpha-bromoacteone produced in situ using bromine in dry acetone in the presence of triethylamine.
Sesquiterpene Hydrocarbons Of The Essential Oil Of Actinolema Macrolema Boiss, Betül Demi̇rci̇, Gülden Koltuksuz Yasdikcioğlu, Kemal Hüsnü Can Başer
Sesquiterpene Hydrocarbons Of The Essential Oil Of Actinolema Macrolema Boiss, Betül Demi̇rci̇, Gülden Koltuksuz Yasdikcioğlu, Kemal Hüsnü Can Başer
Turkish Journal of Chemistry
The essential oils of Actinolema macrolema Boiss. (Apiaceae) were obtained by hydrodistillation in the first 3 (sample A) and the following 3 h (sample B) from crushed fruits and dried leaves (sample C), which were subsequently analyzed by GC and GC-MS. Overall, 64 components were characterized, representing 93% of the leaf oil. Thirty components were characterized from the fruit oil representing 95% of the first fraction and 90% of the second fraction consecutively. Guaia-5,7(11)-diene, selina-3,7(11)-diene, and juniper camphor were isolated from the oils by column chromatography and their structures were elucidated by GC-MS, ^1H NMR, and ^{13}C NMR. The occurrence …
Comparative Study Of Microwave-Assisted And Conventional Synthesis Of Ibuprofen-Based Acyl Hydrazone Derivatives, Ayşe Uzgören Baran
Comparative Study Of Microwave-Assisted And Conventional Synthesis Of Ibuprofen-Based Acyl Hydrazone Derivatives, Ayşe Uzgören Baran
Turkish Journal of Chemistry
A series of potential biological active acyl hydrazone derivatives containing ibuprofen moiety (compounds 4a--4p) was synthesized by the condensation of ibuprofen hydrazone with aromatic aldehydes using conventional and microwave irradiation methods. The microwave method was found to be successful with nearly the same or higher yields and shorter reaction time, and it was more environmentally friendly compared to the conventional heating method. The chemical structures of the synthesized compounds were characterized by IR, ^1H NMR, and APT-NMR spectroscopy.
Syntheses, Characterization, And Antibacterial Study Of Titanium Complexes, Raj Kaushal, Nitesh Kumar, Pamita Awasthi, Kiran Nehra
Syntheses, Characterization, And Antibacterial Study Of Titanium Complexes, Raj Kaushal, Nitesh Kumar, Pamita Awasthi, Kiran Nehra
Turkish Journal of Chemistry
Titanium(II) complexes of composition TiCl_2(L)_2 [where L = 2,2'-bipyridine (bipy), 4,4'-dimethyl-2,2'-bipyridine (bpMe), 4,4'-dimethoxy-2,2'-bipyridine (bpoMe), 6,6'-dimethyl-2,2'-bipyridine (dpMe), adamantylamine (ada)] were prepared by reacting titanium tetrachloride and N-containing bulky ligands in predetermined molar ratios. The complexes synthesized were characterized by different spectroscopic techniques, viz. UV-visible, FTIR, ^1H NMR, and mass spectrometry. The stoichiometry of the complexes was established by their elemental analysis (chlorine and titanium estimation). The unit cell parameters calculated by using the powder XRD tool confirm the monoclinic unit system and P lattice type for all complexes. Antibacterial screening of the ligands as well as the complexes was carried out …
Asymmetric Henry Reaction Catalyzed By Cu(I)-Based Chiral Amino Alcohol Complex, Tianhua Shen, Quan Qin, Hang Ni, Ting Xia, Xiaocong Zhou, Funa Cui, Junqi Li, Deqiang Ran, Qingbao Song
Asymmetric Henry Reaction Catalyzed By Cu(I)-Based Chiral Amino Alcohol Complex, Tianhua Shen, Quan Qin, Hang Ni, Ting Xia, Xiaocong Zhou, Funa Cui, Junqi Li, Deqiang Ran, Qingbao Song
Turkish Journal of Chemistry
The Cu(I)-based complex prepared from (S)-2-(furan-2-yl-methylamino)-2-phenylethanol (5c) and CuCl was used as catalyst in enantioselective Henry reactions of arylaldehydes and nitromethane, which gave 89% ee and 95% yield at ambient temperature. The proposed catalytic cycle of an asymmetric Henry reaction was suggested.
Electrochemical Determination Of Sudan Iv In Food Samples By Using Graphene-Modified Glassy Carbon Electrodes, Meifeng Chen, Xinying Ma, Xia Li
Electrochemical Determination Of Sudan Iv In Food Samples By Using Graphene-Modified Glassy Carbon Electrodes, Meifeng Chen, Xinying Ma, Xia Li
Turkish Journal of Chemistry
A simple and sensitive modified electrode was fabricated with graphene via the drop-casting method and applied for the electrochemical detection of Sudan IV. Cyclic voltammetry (CV) was used to investigate the electrochemical behaviors of Sudan IV in phosphate buffer solution (PBS). The experimental conditions such as determining medium, scan rate, and accumulation time were optimized for the determination of Sudan IV. The sensor has excellent performance associated with high sensitivity, a low detection limit (6.00 \times 10^{-8} M), and a wide linear range of 2.00 \times 10^{-7} M to 8.00 \times 10^{-5} M with a correlation coefficient as follows: i_{pc} …
Determination Of Pb(Ii) In Natural Water With Dibromo-P-Methyl-Sulfonazo By The Light-Absorption Ratio Variation Approach, Jie Zhang
Turkish Journal of Chemistry
Pb ions can react sensitively with dibromo-p-methylsulfonazo (DMSA) to form a blue complex, whose absorption is maximal at 630 nm. By means of the light-absorption ratio variation approach (LARVA), the direct determination of Pb was developed in 0.3 M nitric acid and plots of \Delta A_r^{-1} vs. c_{Pb}^{-1} are linear where \Delta A_r is the light-absorption ratio variation and c_{Pb} Pb(II) concentration is between 0 and 5.0 mg/L. The limit of detection (3\sigma) of Pb(II) is only 0.02 mg/L. This method was applied to direct analysis of natural water with satisfactory results.
Synthesis, Characterization, And Biological Activity Of Coordination Polymers Derived From Pyromellitic Dianhydride, Yogesh Patel, Ritu Dixit, Hasmukh Shanubhai Patel
Synthesis, Characterization, And Biological Activity Of Coordination Polymers Derived From Pyromellitic Dianhydride, Yogesh Patel, Ritu Dixit, Hasmukh Shanubhai Patel
Turkish Journal of Chemistry
A new ligand, 2,5-bis(furan-2-ylmethylcarbamoyl)terephthalic acid (BFMTA), was synthesized using 1,2,4,5-benzenetetracarboxylic dianhydride (pyromellitic dianhydride-PMDA) with furan-2-ylmethanamine (2-furfurylamine). New coordination polymers of the ligand (BFMTA) were also prepared using transition metal ions Mn(II), Fe(II), Co(II), Ni(II), Cu(II), and Zn(II) metal salts. The coordination polymers and ligand were characterized by physico-chemical characteristics, magnetic susceptibilities, spectroscopic investigations, and thermogravimetry. Antimicrobial activity was tested using the agar-plate method against various strains of bacteria and spores of fungi. The results showed significantly higher antimicrobial activity of coordination polymers compared to the ligand.
N-Functionalized Benzimidazol-2-Ylidene Silver Complexes: Synthesis, Characterization, And Antimicrobial Studies, Yetki̇n Gök, Senem Akkoç, Özlem Özeroğlu Çeli̇kal, İlknur Özdemi̇r, Selami̇ Günal, Eli̇f Sayin
N-Functionalized Benzimidazol-2-Ylidene Silver Complexes: Synthesis, Characterization, And Antimicrobial Studies, Yetki̇n Gök, Senem Akkoç, Özlem Özeroğlu Çeli̇kal, İlknur Özdemi̇r, Selami̇ Günal, Eli̇f Sayin
Turkish Journal of Chemistry
2-Methoxyethyl, 2-diethylaminoethyl, and 2-phenylethyl-substituted N-heterocyclic carbene (NHC) precursors were treated with Ag_2CO_3 to yield silver(I)-NHC complexes (1a--g) in dichloromethane as a solvent at room temperature. The 7 new silver-NHC complexes were fully characterized by means of ^1H NMR, ^{13}C NMR, and elemental analysis techniques. Using the agar dilution procedure recommended by the Laboratory and Clinical Standards Institute, the antimicrobial activities of all the silver-NHC complexes were studied against 2 gram-negative bacterial strains (Pseudomonas aeruginosa and Escherichia coli), 2 gram-positive bacterial strains (Enterococcus faecalis and Staphylococcus aureus), and 2 fungi (Candida tropicalis and Candida albicans).
Synthesis, Characterization, And Luminescence Of Zinc(Ii) And Cadmium(Ii) Coordination Complexes: [Zn(Phen)_2(Ch_3coo)](Clo_4), [Zn(Bpy)_2(Clo_4)](Clo_4), And [Cd(Phen)_2(No_3)_2], İbrahi̇m Kani̇, Mehmet Kurtça
Synthesis, Characterization, And Luminescence Of Zinc(Ii) And Cadmium(Ii) Coordination Complexes: [Zn(Phen)_2(Ch_3coo)](Clo_4), [Zn(Bpy)_2(Clo_4)](Clo_4), And [Cd(Phen)_2(No_3)_2], İbrahi̇m Kani̇, Mehmet Kurtça
Turkish Journal of Chemistry
Three metal complexes, [Zn(phen)_2(CH_3COO)](ClO_4) (1), [Zn(bpy)_2(ClO_4)](ClO_4) (2), and [Cd(phen)_2 (NO_3)_2] (3) (phen = 1,10-phenanthroline, bpy = 2,2 {Abedini, 2005 #222} -bipyridine), were synthesized and their structures were determined by single-crystal X-ray diffraction analyses. In 1, Zn(II) is coordinated by 4 nitrogen atoms from 2 phen molecules and 2 oxygen atoms from 1 acetato to form an octahedral configuration. In 2, Zn(II) has pentacoordination geometry with chelating 2 bpy and 1 perchlorato ion. In 3, phen and NO_3^- serve as bidentate ligands coordinating to Cd(II) through their nitrogen and oxygen atoms to form 8 coordination. Three-dimensional frameworks of complexes 1--3 are …
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.
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.
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 \Alpha-Aminonitriles Catalyzed By Montmorillonite K10 In The Presence Of Dicationic Phosphonium Salt In Water Under Ultrasonic Effect, Çi̇ğdem Yildirim, Çi̇ğdem Yolaçan, Feray Aydoğan
Synthesis Of \Alpha-Aminonitriles Catalyzed By Montmorillonite K10 In The Presence Of Dicationic Phosphonium Salt In Water Under Ultrasonic Effect, Çi̇ğdem Yildirim, Çi̇ğdem Yolaçan, Feray Aydoğan
Turkish Journal of Chemistry
The synthesis of \alpha-aminonitriles was successfully accomplished by the 1-pot 3-component reaction of several aldehydes with (S)-\alpha-phenylethylamine and sodium cyanide in water in the presence of montmorillonite K10 and dicationic phosphonium salt under ultrasonic effect with good yields and moderate diastereoselectivities.
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 …
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 …
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 …
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 …
Synthesis And Evaluation Of Enzyme Inhibitory Potential Of Some Derivatives Of Scopolamine, Durre Shahwar, Muhammad Asam Raza, Tania Khan
Synthesis And Evaluation Of Enzyme Inhibitory Potential Of Some Derivatives Of Scopolamine, Durre Shahwar, Muhammad Asam Raza, Tania Khan
Turkish Journal of Chemistry
This study was designed to synthesize and evaluate derivatives of scopolamine (1) as acetylcholine esterase and protease inhibitors. Scopolamine (1) was extracted from the aerial parts of Datura innoxia through bioassay guided fractionation. Five different derivatives of scopolamine (1) were synthesized, and identified through spectroscopic studies. Their acetylcholine esterase (AChE) and trypsin inhibitory potentials were determined through standard protocols and evaluated from the perspective of structure-activity relationship. The synthesized scopolamine derivatives (2-6) showed remarkable AChE inhibitory activity, except for scopoline (6). The results showed higher enzyme inhibition potential of the synthesized compounds (2-5) as compared to scopolamine (1). Maximum inhibition …