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2012

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Articles 18091 - 18120 of 19373

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Controls On Dissolved Cobalt In Surface Waters Of The Sargasso Sea: Comparisons With Iron And Aluminum, R. U. Shelley, Peter N. Sedwick, T. S. Bibby, P. Cabedo-Sanz, T. M. Church, R. J. Johnson, A. I. Macey, C. M. Marsay, E. R. Sholkovitz, S. J. Ussher, P. J. Worsfold, M. C. Lohan Jan 2012

Controls On Dissolved Cobalt In Surface Waters Of The Sargasso Sea: Comparisons With Iron And Aluminum, R. U. Shelley, Peter N. Sedwick, T. S. Bibby, P. Cabedo-Sanz, T. M. Church, R. J. Johnson, A. I. Macey, C. M. Marsay, E. R. Sholkovitz, S. J. Ussher, P. J. Worsfold, M. C. Lohan

OES Faculty Publications

Dissolved cobalt (dCo), iron (dFe) and aluminum (dAl) were determined in water column samples along a meridional transect (∼31°N to 24°N) south of Bermuda in June 2008. A general north-to-south increase in surface concentrations of dFe (0.3-1.6 nM) and dAl (14-42 nM) was observed, suggesting that aerosol deposition is a significant source of dFe and dAl, whereas no clear trend was observed. for near-surface dCo concentrations. Shipboard aerosol samples indicate fractional solubility values of 8-100% for aerosol Co, which are significantly higher than corresponding estimates of the solubility of aerosol Fe (0.44-45%). Hydrographic observations and analysis of time series rain …

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Synthesis And Evaluation Of Enzyme Inhibitory Potential Of Some Derivatives Of Scopolamine, Durre Shahwar, Muhammad Asam Raza, Tania Khan Jan 2012

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 …

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Influence Of Reaction Parameters On The Synthesis Of Surfactant-Assisted Tin Oxide Nanoparticles, Muhammad Akhyar Farrukh, Prisca Tan, Rohana Adnan Jan 2012

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 …

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Polymers From Renewable Resources: Synthesis And Characterization Of Poly(2,5-Dihydro-2,5-Dimethoxy Furan), Hakan Çi̇ftçi̇, Zeki̇ Öktem, Hasan Nur Testereci̇ Jan 2012

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.

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^{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 Jan 2012

^{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 …

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Theory Of Adsorption Equilibria Analysis Based On General Equilibrium Constant Expression, Abdul Sattar Ali Khan Jan 2012

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 …

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Antimicrobial Properties And Dna Interactions Studies Of 3-Hetarylazoquinoline-2,4-Diol Compounds, Fatma Öztürk, Leyla Açik, İzzet Şener, Fi̇kret Karci, Emi̇ne Kiliç Jan 2012

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. …

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Synthesis And Antimicrobial Evaluation Of Some Annelated Phthalazine Derivatives And Acyclo C-Nucleosides From 1-Chloro-4-(2,4,6-Trimethylphenyl) Phthalazine Precursor, Maher Abdel Aziz El-Hashash, Ahmed Youssef Soliman, Ibrahim Essam Elshamy Jan 2012

Synthesis And Antimicrobial Evaluation Of Some Annelated Phthalazine Derivatives And Acyclo C-Nucleosides From 1-Chloro-4-(2,4,6-Trimethylphenyl) Phthalazine Precursor, Maher Abdel Aziz El-Hashash, Ahmed Youssef Soliman, Ibrahim Essam Elshamy

Turkish Journal of Chemistry

A highly efficient and versatile synthetic approach to the synthesis of annelated phthalazine derivatives viz. 1,2,4-triazolo [3,4-a]phthalazine 11a,b, 14, 18, 19a,b, 29-31, 33, 1,2,4-triazino [3,4-a]phthalazine 25a,b-28, 1,3,5-triazino[4,3-a]phthalazine 22, tetrazolo[5,1-a] phthalazine 23, imidazophthalazine 9a,b,15, and pyrimidinophthlazine 6, 10, 16, 17, 20 is presented. Moreover, acyclo C-nucleoside and double headed acyclo C-nucleoside of 1,2,4-triazolo[3,4-a]phthalazine 12, 13 were obtained via heterocyclization reaction of 1-chloro-4-(2,4,6-trimethylphenyl) phthalazine (4) with gluconic acid hydrazide and galactaric acid bis hydrazide, respectively. The new compounds were synthesized with the objective of studying their antimicrobial activity.

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Competitive Hydrogen Bonding In Aspirin-Aspirin And Aspirin-Leucine Interactions, Zeynep Yurtsever, Burak Erman, İsmai̇l Ersi̇n Yurtsever Jan 2012

Competitive Hydrogen Bonding In Aspirin-Aspirin And Aspirin-Leucine Interactions, Zeynep Yurtsever, Burak Erman, İsmai̇l Ersi̇n Yurtsever

Turkish Journal of Chemistry

Aspirin-aspirin and aspirin-leucine interactions are studied by the density functional theory (DFT) and high level ab initio calculations with second order Moller-Plesset perturbation theory (MP2). The rotational isomers of aspirin are identified by their relative stability both in gaseous phase and in water using the polarizable continuum method (PCM). Local minima of aspirin monomers in water are found to be all highly populated compared to the gas phase behavior. Homodimers of aspirin form hydrogen bonds with bond energies of 10 kcal/mol. Weak hydrogen bonds utilizing phenyl and methyl groups are also found. The interaction between aspirin and leucine is stronger …

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Transmission Ft-Ir Spectroscopic Analysis Of Human Kidney Stones In The Hyderabad Region Of Pakistan, Muhammad Hussan Khaskheli, Syed Tufail Hussain Sherazi, Huma Mazhar Ujan, Sarfaraz Ahmed Mahesar Jan 2012

Transmission Ft-Ir Spectroscopic Analysis Of Human Kidney Stones In The Hyderabad Region Of Pakistan, Muhammad Hussan Khaskheli, Syed Tufail Hussain Sherazi, Huma Mazhar Ujan, Sarfaraz Ahmed Mahesar

Turkish Journal of Chemistry

The purpose of the present study was to investigate the composition of kidney stones removed from human patients. Seventeen samples were collected after surgery (5 females and 12 males; age range 2 to 60 years). The samples were analyzed for composition by transmission Fourier transform infrared (FT-IR) spectroscopy. The 17 analyzed samples of kidney stones comprised 29.4% calcium oxalate, 29.4% uric acid, 29.4% calcium oxalate (CaOx)-uric acid, 5.9% phosphate, and 5.9% calcium oxalate-phosphate stones. The results of the study indicated that transmission FT-IR spectroscopy could be used as an environmentally friendly technique for rapid screening of kidney stones.

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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 Jan 2012

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.

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Microwave-Assisted Synthesis, Spectroscopy, And Crystal Structures Of [(H_2-(4,4'-Bipy)]^{2+} [Cr_2o_7]^{2-} And One-Dimensional Polymeric {[Mn(4,4'-Bipy)(Cr_2o_7)(H_2o)_2]\}_N Compounds, Hirihattaya Phetmung, Munee Wateh, Chaveng Pakawatchai Jan 2012

Microwave-Assisted Synthesis, Spectroscopy, And Crystal Structures Of [(H_2-(4,4'-Bipy)]^{2+} [Cr_2o_7]^{2-} And One-Dimensional Polymeric {[Mn(4,4'-Bipy)(Cr_2o_7)(H_2o)_2]\}_N Compounds, Hirihattaya Phetmung, Munee Wateh, Chaveng Pakawatchai

Turkish Journal of Chemistry

A compound (1), [H_2-(4,4'-bipy)]^{2+}[(Cr_2O_7)]^{2-} and a metal organic-inorganic coordination framework (2), [Mn(4,4'-bipy)(Cr_2O_77)(H_2O)_2] (4,4'-bipy=4,4' -bipyridine) were successfully synthesized by microwave method. Their characterization was performed by single crystal X-ray crystallography and FT-IR spectroscopy. The crystal structure of 1 revealed a diprotonated 4,4'-bipyridium dichromate compound while compound 2 is an onedimensional (1D) polymer in which (Cr_2O_7)^{2-} acts as a bridging ligand supporting the formation of infinite {[Mn(4,4'-bipy)(Cr_2O_7)(H_2O)_2]}_n polymeric chains. The geometry of the 4,4'-bipy ring in 1 is typical coplanar, but twists in 2. In the free molecule 1, dichromate ligand adopts an eclipsed conformation, but adopts a staggered conformation in complex. …

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Cover And Contents Jan 2012

Cover And Contents

Turkish Journal of Chemistry

No abstract provided.

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Synthesis And Structural Characterization Of Novel Square Pyramidal Oxovanadium(Iv) Complexes With Ligands Having N And O Donor Atoms, Ashok Kumar Yadava, Hardeo Singh Yadav, Uma Shanker Yadav, Devendra Pratap Rao Jan 2012

Synthesis And Structural Characterization Of Novel Square Pyramidal Oxovanadium(Iv) Complexes With Ligands Having N And O Donor Atoms, Ashok Kumar Yadava, Hardeo Singh Yadav, Uma Shanker Yadav, Devendra Pratap Rao

Turkish Journal of Chemistry

Oxovanadium(IV) complexes having the general formula [VO(L)] were designed and synthesized using vanadyl ion as kinetic template with ligands derived by condensation of \beta-diketones such as acetylacetone, benzoylacetone, thenoyltrifluoroacetone, and dibenzoylmethane with 2-amino-3-hydroxypyridine or 2-aminobenzoic acid or 2-aminonicotinic acid. Tentative structures of the complexes were proposed on the basis of elemental analysis, molar conductance, magnetic moments, and spectral (infrared, electronic and electron spin resonance) data. All the oxovanadium(IV) complexes are 5-coordinated wherein derived ligands act as tetradentate chelating agents.

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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 Jan 2012

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.

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Synthesis And Application Of L-Proline And R-Phenylglycine Derived Organocatalysts For Direct Asymmetric Michael Addition Of Cyclohexanone To Nitroalkenes, Hayri̇ye Nevi̇n Naziroğlu, Abdulkadi̇r Sirit Jan 2012

Synthesis And Application Of L-Proline And R-Phenylglycine Derived Organocatalysts For Direct Asymmetric Michael Addition Of Cyclohexanone To Nitroalkenes, Hayri̇ye Nevi̇n Naziroğlu, Abdulkadi̇r Sirit

Turkish Journal of Chemistry

Novel R-phenylglycine derived organocatalysts were prepared from the reaction of Cbz-R-phenylglycine with indoline, pyrrolidine, or (S)-(-)-2-(diphenylmethyl)pyrrolidine in 3 steps. The asymmetric Michael addition of cyclohexanone to nitroolefins was investigated using R-phenylglycine derivatives along with L-prolinamides as chiral catalysts. The desired products were obtained in excellent yields with enantioselectivities up to 90% ee and diastereomeric ratio up to 98:2 of the syn }addition product.

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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 Jan 2012

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 …

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Preparation Of Porphyrinated Polyacrylonitrile Fiber Mat Supported Tio_2 Photocatalyst And Its Photocatalytic Activities, Linjun Shao, Ji Chen, Luyao He, Guiying Xing, Weixi Lv, Zaina Chen, Chenze Qi Jan 2012

Preparation Of Porphyrinated Polyacrylonitrile Fiber Mat Supported Tio_2 Photocatalyst And Its Photocatalytic Activities, Linjun Shao, Ji Chen, Luyao He, Guiying Xing, Weixi Lv, Zaina Chen, Chenze Qi

Turkish Journal of Chemistry

Fe(III)meso-tetraphenylporphyrinated polyacrylonitrile fiber mat supported TiO_2 photocatalyst (PANC/ TiO_2 mat) was prepared via copolymerization and electrospinning. SEM images showed that well-defined fibers with diameters around 1.47 \pm 0.26 \mu m were fabricated from Fe(III)meso-tetraphenylporphyrin (FeTPP)-acrylonitrile copolymer (PANC) and TiO_2 mixture. The XRD characterizations demonstrated that the electrospinning process had no effect on the anatase structure of TiO_2. The photocatalytic activity of the PANC/TiO_2 mat was examined for the photodegradation of methyl red in aqueous solution under the irradiation of visible light. The results showed that this PANC/TiO_2 fiber mat was very efficient for the photodegradation of methyl red, with a …

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Determination Of Ascorbic Acid By A Modified Multiwall Carbon Nanotube Paste Electrode Using Cetrimonium Iodide/Iodine, Meissam Noroozifar, Mozhgan Khorasani Motlagh, Hamed Tavakoli Jan 2012

Determination Of Ascorbic Acid By A Modified Multiwall Carbon Nanotube Paste Electrode Using Cetrimonium Iodide/Iodine, Meissam Noroozifar, Mozhgan Khorasani Motlagh, Hamed Tavakoli

Turkish Journal of Chemistry

A new modified graphite-multiwall carbon nanotube paste electrode for the determination of ascorbic acid (AA) based on cetrimonium iodide-iodine is described. The electrochemical response characteristics of the modified electrode toward AA were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) in phosphate buffer solution (pH 2.0). When compared to activated carbon, graphite, and multiwall carbon nanotube paste electrode containing new modifier, the proposed modified paste electrode not only shifted the oxidation potential of AA towards less positive potential but also enhanced its oxidation peak current. Further, the oxidation of AA was highly stable at the modified paste electrode. …

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Cover And Contents Jan 2012

Cover And Contents

Turkish Journal of Chemistry

No abstract provided.

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Synthetic Access To Benzazolyl (Pyrazoles, Thiazoles, Or Triazoles), Bakr Fathy Abdelwahab, Hanan Ahmed Mohamed Jan 2012

Synthetic Access To Benzazolyl (Pyrazoles, Thiazoles, Or Triazoles), Bakr Fathy Abdelwahab, Hanan Ahmed Mohamed

Turkish Journal of Chemistry

This review surveys data published in recent years on the synthesis of benzazoles linked directly with pyrazoles, thiazoles, or triazoles. Some of the commercial applications are mentioned.

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Cover And Contents Jan 2012

Cover And Contents

Turkish Journal of Chemistry

No abstract provided.

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Properties Of The Mixed Adsorption Layer: Neutral Detergent-Tetramethylthiourea At Interface Electrode/Solution, Jolanta Nieszporek, Dorota Sienko, Dorota Gugala-Fekner, Malgorzata Klin Jan 2012

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° …

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A Novel Soluble Phthalocyanine Capable Of Binding Four Boronic Esters, Şennur Özçeli̇k, Gülnur Keser Karaoğlan, Gülşah Gümrükçü, Ahmet Gül Jan 2012

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.

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Efficient One-Pot Alkylation Of Imines Using Nanosilver Iodide In Aqueous Media, Javad Safaei Ghomi, Ahmad Kakavand-Qalenoei, Mohammad Ali Ghasemzadeh, Masoud Salavati-Niasari Jan 2012

Efficient One-Pot Alkylation Of Imines Using Nanosilver Iodide In Aqueous Media, Javad Safaei Ghomi, Ahmad Kakavand-Qalenoei, Mohammad Ali Ghasemzadeh, Masoud Salavati-Niasari

Turkish Journal of Chemistry

An efficient ecofriendly method for the alkylation reaction of various imines is described by a simple one-pot reaction of aldehydes, amines and alkyl iodides in the presence of AgI nanoparticles in aqueous media. Silver iodide nanoparticles mediated an enhanced rate and facility of reaction and showed high influence in the green synthesis of some amine derivatives. Moreover, this nanoparticle increased the yields of products and decreased the reaction times in all cases. The heterogeneous mediator was fully characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and FT-IR experimental techniques.

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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 Jan 2012

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. …

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Synthesis And Chemical Transformations Of Azonine Derivatives, Ahmed A. Fadda, Elsayed M. Afsah, Samir Bondock, Mohamed M. Hammouda Jan 2012

Synthesis And Chemical Transformations Of Azonine Derivatives, Ahmed A. Fadda, Elsayed M. Afsah, Samir Bondock, Mohamed M. Hammouda

Turkish Journal of Chemistry

No abstract provided.

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Cover And Contents Jan 2012

Cover And Contents

Turkish Journal of Chemistry

No abstract provided.

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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 Jan 2012

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.

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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 Jan 2012

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 …

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