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Basic Al_2o_3 As A Recyclable Reagent For The Protection Of Carbonyl Groups With Phenylhydrazine Derivatives And Semicarbazides, Khodabakhsh Niknam, Ali Reza Kiasat, Bahador Karami, Nima Heydari
Basic Al_2o_3 As A Recyclable Reagent For The Protection Of Carbonyl Groups With Phenylhydrazine Derivatives And Semicarbazides, Khodabakhsh Niknam, Ali Reza Kiasat, Bahador Karami, Nima Heydari
Turkish Journal of Chemistry
Basic alumina is employed as an inorganic basic solid catalyst for the clean and less hazardous protection of carbonyl compounds, such as phenylhydrazones, 2,4-dinitrophenylhydrazones, semicarbazones, and thiosemicarbazones, under solvent-free conditions. The reactions proceed smoothly and require a short reaction time with good to excellent yields, and the alumina used can be recycled.
Iridoid Glucosides From Lamium Garganicum Subsp. Laevigatum, Tayfun Ersöz, Duygu Kaya, Funda Nuray Yalçin, Cavi̇t Kazaz, Erhan Palaska, Charlott H. Gotfredsen, Soren R. Jensen, İhsan Çaliş
Iridoid Glucosides From Lamium Garganicum Subsp. Laevigatum, Tayfun Ersöz, Duygu Kaya, Funda Nuray Yalçin, Cavi̇t Kazaz, Erhan Palaska, Charlott H. Gotfredsen, Soren R. Jensen, İhsan Çaliş
Turkish Journal of Chemistry
Phytochemical investigations on the above-ground parts of Lamium garganicum subsp. laevigatum resulted in the isolation of 7 iridoid glucosides: shanzhiside methyl ester (1), barlerin (8-O-acetylshanzhiside methyl ester) (2), 6-O-syringyl-8-O-acetylshanzhiside methyl ester (3), 6\beta-hydroxyipolamiide (4), lamalbide (5), dehydropenstemoside (6), and sesamoside (7). The structure of the iridoids was elucidated by spectroscopic (UV, IR, 1D- and 2D-NMR, and ESI-MS) evidence.
Mono-, Di- And Trinuclear Copper(Ii) Complexes Of A Schiff Base Ligand, 2-{(E)-[(6-{[(1e)-(2-Hydroxyphenyl)Methylene]Amino}Pyridin-2-Yl)Imino]-Methyl}Phenol, Nevi̇n Karaböcek, Serdar Karaböcek, Fatma Kormali
Mono-, Di- And Trinuclear Copper(Ii) Complexes Of A Schiff Base Ligand, 2-{(E)-[(6-{[(1e)-(2-Hydroxyphenyl)Methylene]Amino}Pyridin-2-Yl)Imino]-Methyl}Phenol, Nevi̇n Karaböcek, Serdar Karaböcek, Fatma Kormali
Turkish Journal of Chemistry
A Schiff base ligand, 2-{(E)-[(6-[(1E)-(2-hydroxyphenyl) methylene]amino}-pyridin-2-yl)imino]-methyl} phenol (H_2PySAL), was prepared by condensation of 2,6-diaminopyridine and salicylaldehide in EtOH. The Schiff base ligand was checked by elemental analyses, ^1H-NMR, ^{13}C-NMR, IR, UV/Vis, and mass spectral studies. Three new mono-, di-, and trinuclear copper(II) complexes of the Schiff base ligand, formula [Cu(H_2PySAL)]Cl_2, [Cu_2(PySAL) (Phen)]Cl_2, [Cu_3(PySAL)_2]Cl_2, were prepared and characterized by elemental analyses, magnetic moment, and IR, Uv/Vis, and mass spectral studies. The spectroscopic data of the complexes indicate that the copper(II) ions are coordinated by the oxygen atoms and nitrogen atoms (C=N) of the ligand. In the dinuclear complex, in which the …
Synthesis, Spectroscopic Investigation, Crystal Structure, And Biological Screening, Including Antitumor Activity, Of Organotin(Iv) Derivatives Of Piperonylic Acid, Muhammad Hanif, Mukhtiar Hussain, Saqib Ali, Moazzam H. Bhatti, Muhammad Sheeraz Ahmed, Bushra Mirza, Helen S. Evans
Synthesis, Spectroscopic Investigation, Crystal Structure, And Biological Screening, Including Antitumor Activity, Of Organotin(Iv) Derivatives Of Piperonylic Acid, Muhammad Hanif, Mukhtiar Hussain, Saqib Ali, Moazzam H. Bhatti, Muhammad Sheeraz Ahmed, Bushra Mirza, Helen S. Evans
Turkish Journal of Chemistry
We prepared 8 new organotin compounds with the general formulae [R_3SnL], where R = Me (1), Bu (2), Ph (3), and Cy (4) and [R_2SnL_2], where R = Me (5), Et (6), Bu (7), Oct (8), and L = piperonylic acid, and characterized them by elemental analyses, IR spectra, and multinuclear NMR (^1H, ^{13}C, and ^{119}Sn). The structure of 5 was confirmed by single crystal X-ray crystallography. The geometry around the tin atom was compared in both solution and solid state. Crystals of 5 are monoclinic with the space group P2_1/c. The tin geometry is skew trapezoidal bipyramidal, with 2 …
Convergent Synthesis Of Fluorinated Dendrons Using The Mesylate Activation Route, Özgür Altan Bozdemi̇r, Meltem Di̇lek, Mehmet Tutaş
Convergent Synthesis Of Fluorinated Dendrons Using The Mesylate Activation Route, Özgür Altan Bozdemi̇r, Meltem Di̇lek, Mehmet Tutaş
Turkish Journal of Chemistry
In this paper we describe an alternative route for the preparation of dendrons bearing fluoro aryl functionalities at the periphery using mesylate activation. p-Fluorobenzyl bromide and perfluorobenzyl bromide were used to introduce the p-fluoro and perfluorobenzyl moieties at the periphery of dendrons. 3,5-Dihydroxybenzyl alcohol was used as the repeating unit of the dendrons. In this convergent approach, the Williamson ether synthesis technique was used as the generation enhancement step. Second generation mono- and perfluorobenzyl alcohol dendrons were obtained from active mesylate precursors. This mesylate activation method has the advantage of short reaction times in the subsequent steps and avoids chromatographic …
Plasma-Initiated Polymerization Of (2-Methacryloyloxyethyl) Thrimethyl Ammonium Chloride, Yangang He, Gang Li, Jing Miao, Xueqing Yu, Fang Yang, Yingjun Cui, Fengxia Ren, Yang Chao
Plasma-Initiated Polymerization Of (2-Methacryloyloxyethyl) Thrimethyl Ammonium Chloride, Yangang He, Gang Li, Jing Miao, Xueqing Yu, Fang Yang, Yingjun Cui, Fengxia Ren, Yang Chao
Turkish Journal of Chemistry
Plasma-initiated polymerization of (2-methacryloyloxyethyl) thrimethyl ammonium chloride (MTAC)) was studied. The effects of discharge time and discharge power on temperature in a tubular-type reactor chamber were accurately tested by on-line thermocouple, and the equation relating discharge time, discharge power and temperature in the tubular-type reactor chamber was derived. The results indicated that temperature played a very important role in controlling the solubility of Poly(MTAC) in water. For T \ge 130°, Poly(MTAC) was cross-linked, and the highest rate of absorbing water of Poly(MTAC) was 15 g · g^{-1}. For T < 130°, Poly(MTAC) was linear, and the highest intrinsic viscosity of Poly(MTAC) was 420.2 cm^3 · g^{-1}. The polymerization condition of linear Poly(MTAC) was optimized as follows: discharge time 60 s and discharge power 60 W.
Electrochemical Characteristics Of A 7-Ferrocenyl(Carbonyloxy)-1- Heptanethiol-Modified Gold Electrode, Mohammed Muzibur Rahman, Il Cheol Jeon
Electrochemical Characteristics Of A 7-Ferrocenyl(Carbonyloxy)-1- Heptanethiol-Modified Gold Electrode, Mohammed Muzibur Rahman, Il Cheol Jeon
Turkish Journal of Chemistry
The electrochemical properties of 7-ferrocenyl(carbonyloxy)-1-heptanethiol [FcCO_2(CH_2)_7SH] were characterized by an electrochemical quartz crystal microbalance (EQCM). A gold surface was modified with FcCO_2(CH_2)_7SH by the self-assembly method. EQCM was used to investigate mass change during the redox reactions of FcCO_2(CH_2)_7SH monolayers on a modified gold electrode in solution containing K_3Fe(CN)_6 redox species. The FcCO_2(CH_2)_7SH monolayer on gold acts as a mediator for the electron transfer between a gold electrode and electroactive species Fe(CN)_6^{3-/4-} in solution. In both cases, electrochemical current responses were complicated because the observed currents were due to the redox of both the ferrocenyl group immobilized on gold and …
Efficient Method For Tetrahydropyranylation Of Phenols And Alcohols Using 2,4,6-Trichloro[1,3,5]Triazine, Batool Akhlaghinia, Elham Roohi
Efficient Method For Tetrahydropyranylation Of Phenols And Alcohols Using 2,4,6-Trichloro[1,3,5]Triazine, Batool Akhlaghinia, Elham Roohi
Turkish Journal of Chemistry
Alcohols and phenols were tetrahydropyranylated in the presence of 2,4,6-trichloro[1,3,5]triazine in good to excellent yields in acetonitrile.
New Aromatic Polyamide With Azo And Phosphine Oxide Groups In The Main Chain, Khalil Faghihi, Mohsen Hagibeygi
New Aromatic Polyamide With Azo And Phosphine Oxide Groups In The Main Chain, Khalil Faghihi, Mohsen Hagibeygi
Turkish Journal of Chemistry
A new flame-retardant polyamide containing phosphine oxide and azobenzene moieties in the main chain was synthesized by the solution polycondensation reaction of 4,4`-azodibenzoic acid with bis(3-aminophenyl) phenyl phosphine oxide using thionyl chloride, N-methyl-2-pyrrolidone and pyridine. This new polymer was obtained in high yield (96%) and showed high inherent viscosity (0.55 dL/g) and was characterized by elemental analysis, FT-IR spectroscopy, thermal gravimetric analysis (TGA and DTG) and solubility test. Furthermore, another polyamide was prepared by solution polycondensation reaction of 4,4`-azodibenzoic acid with 1,4-phenylene diamine and its flame-retardant behavior was compared by the use of the LOI with the previous one.
Preparation And Characterization Of An Atenolol Selective Electrode Based On A Pvc Matrix Membrane, Nabil S. Nassory, Shabaz A. Maki, Mutaz A. Ali
Preparation And Characterization Of An Atenolol Selective Electrode Based On A Pvc Matrix Membrane, Nabil S. Nassory, Shabaz A. Maki, Mutaz A. Ali
Turkish Journal of Chemistry
Atenolol selective electrodes were prepared based on a complex atenolol-phosphotungstate as an active material using the plasticizers di-butyl phosphate (DBP), tri-butyl phosphate (TBP), o-nitro phenyl octyl ether (NPOE) and di-octyl phthalate (DOPH) in a PVC matrix membrane. The properties of the prepared electrodes were studied, namely slope, concentration range, detection limit, lifetime, pH effect and selectivity. The experimental results showed that the best electrode was based on DOPH as plasticizer, displaying a linear range from 1.00 x 10^{-4} M to 5.00 x 10^{-2} M with a Nernstian slope of 55.91 mV/decade and correlation coefficient of 0.9995. The detection limit was …
Studies On The Preparation Of \Alpha,\Omega -Telechelic Polymers By The Combination Of Reverse Atom Transfer Radical Polymerization And Atom Transfer Radical Coupling Processes, Bi̇nnur Aydoğan, Yusuf Yağci
Studies On The Preparation Of \Alpha,\Omega -Telechelic Polymers By The Combination Of Reverse Atom Transfer Radical Polymerization And Atom Transfer Radical Coupling Processes, Bi̇nnur Aydoğan, Yusuf Yağci
Turkish Journal of Chemistry
Monofunctional polystyrenes with cyano, carboxylic acid, and hydroxyl terminal groups were synthesized by reverse atom transfer radical polymerization (RATRP) using corresponding azo initiators in conjunction with copper and iron complexes. These functional polymers were further used in the atom transfer radical coupling (ATRC) reaction in the presence of Cu(I) and Cu(0) in order to obtain telechelic polystyrenes. In the iron-mediated system, while RATRP experiments gave satisfactory results, the corresponding ATRC process yielded polymers with low functionality. The copper-mediated system, however, gave contrary results. In the RATRP step, initiation efficiency was rather low and polymers with relatively higher polydispersity were obtained. …
A Convenient Method For The Preparation Of 2-Aminobenzophenone Derivatives Under Ultrasonic Irradiation, Javad Safaei-Ghomi, Manouchehr Fadaeian, Alireza Hatami
A Convenient Method For The Preparation Of 2-Aminobenzophenone Derivatives Under Ultrasonic Irradiation, Javad Safaei-Ghomi, Manouchehr Fadaeian, Alireza Hatami
Turkish Journal of Chemistry
A quick and convenient method for the preparation of 2-aminobenzophenone derivatives is described. This approach consists of the nucleophilic substitution reaction of nitrobenzenes by phenylacetonitrile under conventional and ultrasonic conditions followed by reduction of the produced 2,1-benzisoxazole to 2-aminobenzophenone. This 2-step reaction was studied by changing the reaction parameters (reaction temperature, ultrasound power, and reaction time). The results clearly demonstrated that using ultrasound irradiation results in a high yield within a short reaction time.
Synthesis Of Nitrogen-Containing Heterocycles From The Reaction Of Amidrazones With \Alpha-Haloesters, Hany M. Dalloul, Peter H. Boyle
Synthesis Of Nitrogen-Containing Heterocycles From The Reaction Of Amidrazones With \Alpha-Haloesters, Hany M. Dalloul, Peter H. Boyle
Turkish Journal of Chemistry
The reaction of amidrazones 1 with \alpha-haloesters 2 formed 1,3,5-substituted 4,5-dihydro-1,2,4-triazin-6-ones (4a-z) rather than 1,2,4-triazin-5-one derivatives (5a-z). The microanalysis and spectral data of the synthesized compounds are in full agreement with their molecular structure.
Investigation Of Some 1,3-Diols For The Requirements Of Solvent Extraction Of Boron: 2,2,6-Trimethyl-1,3 Heptanediol As A Potential Boron Extractant, Bi̇lsen Tural, Servet Tural, Hali̇l Hoşgören
Investigation Of Some 1,3-Diols For The Requirements Of Solvent Extraction Of Boron: 2,2,6-Trimethyl-1,3 Heptanediol As A Potential Boron Extractant, Bi̇lsen Tural, Servet Tural, Hali̇l Hoşgören
Turkish Journal of Chemistry
Eighteen 1,3-diols were synthesized and their structure and distribution ratio for the solvent extraction of boron were studied. Diols with a high distribution ratio (D_{B(OH)_3 > 10) were investigated for the requirements of solvent extraction of boron. Their extraction capacity, and solubility in aqueous phase and in organic diluents were investigated by comparison to 2-ethyl-1,3-hexanediol (EHD), which is widely used as a boron extractant. Among a series of 1,3 diols, 1-benzyl-2,2-dimethyl-1,3-propanediol (4a) and 2,2,6-trimethyl-1,3-heptanediol (3a) were found to have very low solubility in the aqueous phase compared to the others. IPD (3a) was found to have a high solubility in aliphatic …
On-Line Preconcentration And Speciation Of Chromium By An 8-Hydroxyquinoline Microcolumn Immobilized On Surfactant-Coated Alumina And Flow Injection Atomic Absorption Spectrometry, Seyyed Hamid Ahmadi, Ali Mohammad Haji Shabani, Shayessteh Dadfarnia, Masoumeh Taei
On-Line Preconcentration And Speciation Of Chromium By An 8-Hydroxyquinoline Microcolumn Immobilized On Surfactant-Coated Alumina And Flow Injection Atomic Absorption Spectrometry, Seyyed Hamid Ahmadi, Ali Mohammad Haji Shabani, Shayessteh Dadfarnia, Masoumeh Taei
Turkish Journal of Chemistry
An on-line technique for the determination of chromium species with atomic absorption spectrometry is described. The method is based on separation and preconcentration of Cr(III) on a microcolumn of immobilized 8-hydroxyquinoline on surfactant-coated alumina. The adsorbed analyte is then eluted with 400 \mu L of 20% ethanolic solution of 1.5 mol L^{-1} hydrochloric acid and is transported to a flame atomic absorption spectrometer for quantification. The effects of pH, sample and eluent flow rate, sorption capacity, and the presence of various cations and anions on the sorption of Cr(III) were investigated. The sorption was quantitative in the pH 6-8 range, …
Synthesis And Cytotoxic Activity Of Platinum(Ii) And Platinum(Iv) Complexes With 2-Hydroxymethylbenzimidazole Or 5(6)-Chloro-2-Hydroxymethylbenzimidazole Ligands Against Mcf-7 And Hela Cell Lines, Semra Utku, Fatma Gümüş, Si̇bel Gür, Aykut Özkul
Synthesis And Cytotoxic Activity Of Platinum(Ii) And Platinum(Iv) Complexes With 2-Hydroxymethylbenzimidazole Or 5(6)-Chloro-2-Hydroxymethylbenzimidazole Ligands Against Mcf-7 And Hela Cell Lines, Semra Utku, Fatma Gümüş, Si̇bel Gür, Aykut Özkul
Turkish Journal of Chemistry
Four platinum(II) and 4 platinum(IV) complexes with the structures [PtL_2Cl_2], [PtL_2I_2], [PtL_2Cl_4], and [PtL_2Cl_2(OH)_2] (L = 5(6)-non/orchloro-substituted-2-hydroxymethylbenzimidazole ligands as ``non-leaving groups''), respectively, were synthesized and characterized by their elemental analyses, and IR and ^1H-NMR spectra. In vitro cytotoxic activities of the platinum(II) and platinum(IV) complexes were tested against the human MCF-7 (breast cancer) and HeLa (cervix cancer) cell lines using the cell culture method. In general, the platinum(II) complexes were more active than the corresponding platinum(IV) complexes. The complexes, which were found to be less active than cisplatin, exhibited cyctotoxicity comparable to carboplatin on the human MCF-7 and HeLa cell …
A New Ursane-Type Triterpenoid From Salvia Santolinifolia, Zaher Ahmad, Sajid Mehmood, Rehana Ifzal, Abdul Malik, Nighat Afza, Mohammad Ashraf, Erum Jahan
A New Ursane-Type Triterpenoid From Salvia Santolinifolia, Zaher Ahmad, Sajid Mehmood, Rehana Ifzal, Abdul Malik, Nighat Afza, Mohammad Ashraf, Erum Jahan
Turkish Journal of Chemistry
Santolinoic acid (1), a new ursane-type triterpene was isolated from the chloroform soluble fraction of Salvia santolinifolia. Its structure was established as 2\alpha, 3\beta, 9\alpha-trihydroxyurs-12-en-28-oic acid on the basis of spectroscopic analysis, including high resolution mass spectroscopy, and 1- and 2-dimensional NMR techniques. The compound (1) showed inhibitory activity against the enzymes acetylcholinesterase and butyrylcholinesterase.
Voltammetric And Spectroscopic Studies Of Vanadium(V)-- Nicotinamide Interactions At Physiological Ph, Semi̇ha Çakir, Ender Bi̇çer
Voltammetric And Spectroscopic Studies Of Vanadium(V)-- Nicotinamide Interactions At Physiological Ph, Semi̇ha Çakir, Ender Bi̇çer
Turkish Journal of Chemistry
The interaction of nicotinamide (NA) with NH_4VO_3 at the physiological pH (pH 7.4) was studied by voltammetry and UV-Vis spectroscopy. The reduction of V(V) ions complexed with NA in phosphate buffer (pH 7.4) was observed as a well-defined reversible reduction peak at --0.35 V. The stoichiometric (metal:ligand) ratio of the complex of V(V) with NA was determined as 1:2 by the mole ratio method.
Hydrothermal Synthesis, Characterization And Photocatalytic Activity Of Nanosized Tio_2 Based Catalysts For Rhodamine B Degradation, Funda Sayilkan, Meltem Asi̇ltürk, Şadi̇ye Şener, Sema Erdemoğlu, Murat Erdemoğlu, Hi̇kmet Sayilkan
Hydrothermal Synthesis, Characterization And Photocatalytic Activity Of Nanosized Tio_2 Based Catalysts For Rhodamine B Degradation, Funda Sayilkan, Meltem Asi̇ltürk, Şadi̇ye Şener, Sema Erdemoğlu, Murat Erdemoğlu, Hi̇kmet Sayilkan
Turkish Journal of Chemistry
Nanosize crystalline TiO_2 and SiO_2/TiO_2 mixed oxide particles as a photocatalyst for rhodamine B dye (RB) degradation in aqueous media were synthesized by a hydrothermal process at 200 °C. They were characterized using XRD, SEM, FT-IR, UV/VIS and BET analysis. The effects of silica content on the crystallinity and photocatalytic activity of TiO_2 were investigated. Photocatalytic activity of the nano-TiO_2 was compared with that of SiO_2/TiO_2 mixed oxides at the same conditions for degradation of RB, and mixed oxide catalysts showed more effective catalytic activity than the TiO_2. The results revealed that photodegradation of RB proceeds by pseudo-first-order reaction kinetics …
Template-Free Synthesis Of Zsm-5 Type Zeolite Layers On Porous Alumina Disks, Hali̇l Kalipçilar, Ali̇ Çulfaz
Template-Free Synthesis Of Zsm-5 Type Zeolite Layers On Porous Alumina Disks, Hali̇l Kalipçilar, Ali̇ Çulfaz
Turkish Journal of Chemistry
ZSM-5 crystals were synthesized from template-free batches on macroporous \alpha-alumina disks. The SiO_2/Al_2O_3 ratio of the synthesis gel influenced the crystal morphology, surface coverage and intergrowth among the crystals. Prismatic ZSM-5 crystals covered the disk surface when the SiO_2/Al_2O_3 ratio of the batch was higher than 100, whereas spherical polycrystalline particles of ZSM-5 were obtained from batches with a SiO_2/Al_2O_3 ratio of 80. Mordenite type zeolite was formed on the disk surface due to the incorporation of alumina dissolved from the disk when the time of crystallization was extended. The effects of silica source and seeding of the support surface …
Synthesis And Spectroscopic Characterization Of New [Cu(^{Tbu}Salpphen)]_2, [Mocl_2(Salpphen)]_2 Complexes And Sn_2cl_8(^{Tbu}Salpphen).2hnet_3 Adduct, Peli̇n Sözen, Yurdanur Akgül, Funda Demi̇rhan
Synthesis And Spectroscopic Characterization Of New [Cu(^{Tbu}Salpphen)]_2, [Mocl_2(Salpphen)]_2 Complexes And Sn_2cl_8(^{Tbu}Salpphen).2hnet_3 Adduct, Peli̇n Sözen, Yurdanur Akgül, Funda Demi̇rhan
Turkish Journal of Chemistry
Tetradentate Schiff base ligands, which were derived from the condensation of phenylenediamine with salicylaldehyde [salpphenH_2: N, N'-p-phenylene-bis(salicyclideneimine)] or 3,5-di-tert-butyl-2-hydroxyben- zaldehyde [^{tBu}salpphenH_2: N, N'-p-phenylene-bis(3,5-di-tert-butylsalicylidene)] and their complexes of Cu(II), Mo(IV) and adduct of Sn(IV) were synthesized and characterized by ^1H-NMR, ^{13}C-NMR, and IR spectroscopic methods, mp, elemental analysis, and magnetic susceptibility. According to these data probable structures were assigned to these complexes and adduct. These are of the formula [Cu(^{tBu}salpphen)]_2 and [MoCl_2(salpphen)]_2, and Sn_2Cl_8(^{tBu}salpphen).2HNEt_3. [Cu(^{tBu}salpphen)]_2 was prepared by the reaction of the metal salt with the ^{tBu}salpphenH_2 Schiff base ligand in EtOH. [MoCl_2(salpphen)]_2 was synthesized by reactions of [MoCl_4(CH_3CN)_2] with the …
Synthesis And Physico-Chemical And Spectroscopic Investigations Of Sodium Dihydrobis(1,2,3-Benzotriazolyl)Borate Ligand And Its Transition Metal Complexes, . Lutfullah, Ahmad Umar, Mohammed Muzibur Rahman, Mohammad Mansoob Khan, Yoon Bong Hahn
Synthesis And Physico-Chemical And Spectroscopic Investigations Of Sodium Dihydrobis(1,2,3-Benzotriazolyl)Borate Ligand And Its Transition Metal Complexes, . Lutfullah, Ahmad Umar, Mohammed Muzibur Rahman, Mohammad Mansoob Khan, Yoon Bong Hahn
Turkish Journal of Chemistry
The title ligand, sodium dihydrobis(1,2,3-benzotriazolyl)borate, Na[H_2B(BTz)_2], was synthesized by refluxing 1 mole of sodium borohydride with 2 moles of 1,2,3- benzotriazole in toluene. The ligand shows ample reactivity towards Cr(III), Mn(II), Fe(III), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) metal ions and forms stable complexes. The ligand and its metal complexes were characterized by physico-chemical and spectroscopic techniques. All the complexes of divalent metal ions are tetrahedral except for Cu(II), which has been proposed to have a square-planar geometry. The complexes of Cr(III) and Fe(III) appear to have an octahedral geometry. The magnitude of molar conductance of 10^{-3} M …
Investigation Of The Voltammetric Characteristics Of Poly(1,4-Diaminobenzene) Film As A Dopamine-Selective Polymer Electrode, Gamze Erdoğdu, A. Ersi̇n Karagözler
Investigation Of The Voltammetric Characteristics Of Poly(1,4-Diaminobenzene) Film As A Dopamine-Selective Polymer Electrode, Gamze Erdoğdu, A. Ersi̇n Karagözler
Turkish Journal of Chemistry
Electrochemical polymerization of 1,4-diaminobenzene in the KCl aqueous electrolyte at a potential of 0.600 V versus Ag/AgCl produces adherent poly(1,4-diaminobenzene) film on a gold electrode. The electrochemical behavior of dopamine and ascorbic acid at the polymer electrode prepared in this manner was examined by cyclic and differential pulse voltammetry. Voltammetry studies showed that polymeric film with a thickness corresponding to a 7-mC charge exhibited selective permeation for dopamine while retaining ascorbic acid. All the polymerization parameters affecting the permselective characteristics were systematically investigated and the optimum values were determined. The results showed that a polymeric membrane, owing to its permselective …
Synthesis And Characterization Of Polyimides Prepared From Optically Active (R,R) And (S,S)-1,3-Bis(P-N,N´-Dimethylaminobenzyl)-Perhydrobenzimidazol-2-Thion, Murat Yi̇ği̇t, Turgay Seçki̇n, Süleyman Köytepe, Engi̇n Çeti̇nkaya
Synthesis And Characterization Of Polyimides Prepared From Optically Active (R,R) And (S,S)-1,3-Bis(P-N,N´-Dimethylaminobenzyl)-Perhydrobenzimidazol-2-Thion, Murat Yi̇ği̇t, Turgay Seçki̇n, Süleyman Köytepe, Engi̇n Çeti̇nkaya
Turkish Journal of Chemistry
This paper presents the synthesis and characterization of polyimides containing a chiral (R,R) or (S,S) 1,3-bis(p-N,N´-dimethylaminobenzyl)-perhydrobenzimidazol-2-thion unit in the backbone. The reactions occur between equimolar amounts of a dianhydride and an aromatic dimethylamine in the presence of the solvent N-methyl-2-pyrollidone (NMP). In this work, the chiral monomer RR and SS -1,3-bis(p-N,N´-dimethylaminobenzyl)-perhydrobenzimidazol- 2-thion were used as diamines. The polyimides obtained were characterized by thermogravimetry (TGA), differential thermal analysis (DTA), differential scanning calorimeter (DSC), infrared spectroscopy (FT-IR), and gel permeation chromatography (GPC). It was found that the composition of the polymer had a significant effect upon the thermal behavior of the material.
Chemoenzymatic Synthesis Of 2-Bromo-6-Hydroxy-3-Methoxy-2-Cyclohexen-1-One, Emi̇ne Özgül Karaaslan, Yasemi̇n Toka
Chemoenzymatic Synthesis Of 2-Bromo-6-Hydroxy-3-Methoxy-2-Cyclohexen-1-One, Emi̇ne Özgül Karaaslan, Yasemi̇n Toka
Turkish Journal of Chemistry
A chemoenzymatic synthesis of 2-bromo-6-hydroxy-3-methoxy-2- cyclohexen-1-one starting from cyclohexane-1,3-dione is reported. Manganese(III) acetate-mediated acetoxylation followed by the enzyme-mediated hydrolysis of \alpha'-acetoxy enone affords hydroxy-enone 5 and acetoxy enone 4 with high enantiomeric excesses in good yields.
Gold(Iii) Complex Of Caffeine: Synthesis, Isolation And Spectroscopic Characterization, Bojidarka Ivanova
Gold(Iii) Complex Of Caffeine: Synthesis, Isolation And Spectroscopic Characterization, Bojidarka Ivanova
Turkish Journal of Chemistry
Au(III)-caffeine complex was synthesized and characterized by means of solid-state linear-dichroic infrared spectral analysis (IRLD), ^1H-NMR, MS, DSC and TGA methods. The caffeine (I) is monodentate and coordinated with metal ion through its N9 atom at molar ratio metal to ligand 1:1. The other 3 positions in the Au(III) coordination sphere are occupied by Cl^-, thus forming [Au^{3+}(C_8H_{10}N_4O_2)Cl_3] complex. IR-characteristic band assignment in the 4000-400 cm^{-1} IR region of pure ligand and corresponding Au(III)complex was performed.